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Copyright 2010-2016 Mike Bostock
All rights reserved.
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are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
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# d3-zoom
Panning and zooming are popular interaction techniques which let the user focus on a region of interest by restricting the view. It is easy to learn due to direct manipulation: click-and-drag to pan (translate), spin the wheel to zoom (scale), or use touch. Panning and zooming are widely used in web-based mapping, but can also be used with visualizations such as time-series and scatterplots.
The zoom behavior implemented by d3-zoom is a convenient but flexible abstraction for enabling pan-and-zoom on [selections](https://github.com/d3/d3-selection). It handles a surprising variety of [input events](#api-reference) and browser quirks. The zoom behavior is agnostic about the DOM, so you can use it with SVG, HTML or Canvas.
[<img alt="Canvas Zooming" src="https://raw.githubusercontent.com/d3/d3-zoom/master/img/dots.png" width="420" height="219">](https://observablehq.com/@d3/zoom-canvas)[<img alt="SVG Zooming" src="https://raw.githubusercontent.com/d3/d3-zoom/master/img/dots.png" width="420" height="219">](https://observablehq.com/@d3/zoom)
The zoom behavior is also designed to work with [d3-scale](https://github.com/d3/d3-scale) and [d3-axis](https://github.com/d3/d3-axis); see [*transform*.rescaleX](#transform_rescaleX) and [*transform*.rescaleY](#transform_rescaleY). You can also restrict zooming using [*zoom*.scaleExtent](#zoom_scaleExtent) and panning using [*zoom*.translateExtent](#zoom_translateExtent).
[<img alt="Axis Zooming" src="https://raw.githubusercontent.com/d3/d3-zoom/master/img/axis.png" width="420" height="219">](https://observablehq.com/@d3/zoomable-scatterplot)
The zoom behavior can be combined with other behaviors, such as [d3-drag](https://github.com/d3/d3-drag) for dragging, and [d3-brush](https://github.com/d3/d3-brush) for focus + context.
[<img alt="Drag & Zoom II" src="https://raw.githubusercontent.com/d3/d3-zoom/master/img/dots.png" width="420" height="219">](https://observablehq.com/@d3/drag-zoom)[<img alt="Brush & Zoom" src="https://raw.githubusercontent.com/d3/d3-zoom/master/img/brush.png" width="420" height="219">](https://observablehq.com/@d3/focus-context)
The zoom behavior can be controlled programmatically using [*zoom*.transform](#zoom_transform), allowing you to implement user interface controls which drive the display or to stage animated tours through your data. Smooth zoom transitions are based on [“Smooth and efficient zooming and panning”](http://www.win.tue.nl/~vanwijk/zoompan.pdf) by Jarke J. van Wijk and Wim A.A. Nuij.
[<img alt="Zoom Transitions" src="https://raw.githubusercontent.com/d3/d3-zoom/master/img/transition.png" width="420" height="219">](https://observablehq.com/@d3/programmatic-zoom)
See also [d3-tile](https://github.com/d3/d3-tile) for examples panning and zooming maps.
## Installing
If you use NPM, `npm install d3-zoom`. Otherwise, download the [latest release](https://github.com/d3/d3-zoom/releases/latest). You can also load directly from [d3js.org](https://d3js.org), either as a [standalone library](https://d3js.org/d3-zoom.v2.min.js) or as part of [D3](https://github.com/d3/d3). AMD, CommonJS, and vanilla environments are supported. In vanilla, a `d3` global is exported:
```html
<script src="https://d3js.org/d3-color.v2.min.js"></script>
<script src="https://d3js.org/d3-dispatch.v2.min.js"></script>
<script src="https://d3js.org/d3-ease.v2.min.js"></script>
<script src="https://d3js.org/d3-interpolate.v2.min.js"></script>
<script src="https://d3js.org/d3-selection.v2.min.js"></script>
<script src="https://d3js.org/d3-timer.v2.min.js"></script>
<script src="https://d3js.org/d3-transition.v2.min.js"></script>
<script src="https://d3js.org/d3-drag.v2.min.js"></script>
<script src="https://d3js.org/d3-zoom.v2.min.js"></script>
<script>
var zoom = d3.zoom();
</script>
```
[Try d3-zoom in your browser.](https://observablehq.com/collection/@d3/d3-zoom)
## API Reference
This table describes how the zoom behavior interprets native events:
| Event | Listening Element | Zoom Event | Default Prevented? |
| ------------ | ----------------- | ----------- | ------------------ |
| mousedown⁵ | selection | start | no¹ |
| mousemove² | window¹ | zoom | yes |
| mouseup² | window¹ | end | yes |
| dragstart² | window | - | yes |
| selectstart² | window | - | yes |
| click³ | window | - | yes |
| dblclick | selection | *multiple*⁶ | yes |
| wheel⁸ | selection | zoom⁷ | yes |
| touchstart | selection | *multiple*⁶ | no⁴ |
| touchmove | selection | zoom | yes |
| touchend | selection | end | no⁴ |
| touchcancel | selection | end | no⁴ |
The propagation of all consumed events is [immediately stopped](https://dom.spec.whatwg.org/#dom-event-stopimmediatepropagation).
¹ Necessary to capture events outside an iframe; see [d3-drag#9](https://github.com/d3/d3-drag/issues/9).
<br>² Only applies during an active, mouse-based gesture; see [d3-drag#9](https://github.com/d3/d3-drag/issues/9).
<br>³ Only applies immediately after some mouse-based gestures; see [*zoom*.clickDistance](#zoom_clickDistance).
<br>⁴ Necessary to allow [click emulation](https://developer.apple.com/library/ios/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html#//apple_ref/doc/uid/TP40006511-SW7) on touch input; see [d3-drag#9](https://github.com/d3/d3-drag/issues/9).
<br>⁵ Ignored if within 500ms of a touch gesture ending; assumes [click emulation](https://developer.apple.com/library/ios/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html#//apple_ref/doc/uid/TP40006511-SW7).
<br>⁶ Double-click and double-tap initiate a transition that emits start, zoom and end events; see [*zoom*.tapDistance](#zoom_tapDistance)..
<br>⁷ The first wheel event emits a start event; an end event is emitted when no wheel events are received for 150ms.
<br>⁸ Ignored if already at the corresponding limit of the [scale extent](#zoom_scaleExtent).
<a href="#zoom" name="zoom">#</a> d3.<b>zoom</b>() · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js), [Examples](https://observablehq.com/collection/@d3/d3-zoom)
Creates a new zoom behavior. The returned behavior, [*zoom*](#_drag), is both an object and a function, and is typically applied to selected elements via [*selection*.call](https://github.com/d3/d3-selection#selection_call).
<a href="#_zoom" name="_zoom">#</a> <i>zoom</i>(<i>selection</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js), [Examples](https://observablehq.com/collection/@d3/d3-zoom)
Applies this zoom behavior to the specified [*selection*](https://github.com/d3/d3-selection), binding the necessary event listeners to allow panning and zooming, and initializing the [zoom transform](#zoom-transforms) on each selected element to the identity transform if not already defined. This function is typically not invoked directly, and is instead invoked via [*selection*.call](https://github.com/d3/d3-selection#selection_call). For example, to instantiate a zoom behavior and apply it to a selection:
```js
selection.call(d3.zoom().on("zoom", zoomed));
```
Internally, the zoom behavior uses [*selection*.on](https://github.com/d3/d3-selection#selection_on) to bind the necessary event listeners for zooming. The listeners use the name `.zoom`, so you can subsequently unbind the zoom behavior as follows:
```js
selection.on(".zoom", null);
```
To disable just wheel-driven zooming (say to not interfere with native scrolling), you can remove the zoom behavior’s wheel event listener after applying the zoom behavior to the selection:
```js
selection
.call(zoom)
.on("wheel.zoom", null);
```
Alternatively, use [*zoom*.filter](#zoom_filter) for greater control over which events can initiate zoom gestures.
Applying the zoom behavior also sets the [-webkit-tap-highlight-color](https://developer.apple.com/library/mac/documentation/AppleApplications/Reference/SafariWebContent/AdjustingtheTextSize/AdjustingtheTextSize.html#//apple_ref/doc/uid/TP40006510-SW5) style to transparent, disabling the tap highlight on iOS. If you want a different tap highlight color, remove or re-apply this style after applying the drag behavior.
<a href="#zoom_transform" name="zoom_transform">#</a> <i>zoom</i>.<b>transform</b>(<i>selection</i>, <i>transform</i>[, <i>point</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js), [Examples](https://observablehq.com/collection/@d3/d3-zoom)
If *selection* is a selection, sets the [current zoom transform](#zoomTransform) of the selected elements to the specified *transform*, instantaneously emitting start, zoom and end [events](#zoom-events). If *selection* is a transition, defines a “zoom” tween to the specified *transform* using [d3.interpolateZoom](https://github.com/d3/d3-interpolate/blob/master/README.md#interpolateZoom), emitting a start event when the transition starts, zoom events for each tick of the transition, and then an end event when the transition ends (or is interrupted). The transition will attempt to minimize the visual movement around the specified *point*; if the *point* is not specified, it defaults to the center of the viewport [extent](#zoom_extent). The *transform* may be specified either as a [zoom transform](#zoom-transforms) or as a function that returns a zoom transform; similarly, the *point* may be specified either as a two-element array [*x*, *y*] or a function that returns such an array. If a function, it is invoked for each selected element, being passed the current event (`event`) and datum `d`, with the `this` context as the current DOM element.
This function is typically not invoked directly, and is instead invoked via [*selection*.call](https://github.com/d3/d3-selection#selection_call) or [*transition*.call](https://github.com/d3/d3-transition#transition_call). For example, to reset the zoom transform to the [identity transform](#zoomIdentity) instantaneously:
```js
selection.call(zoom.transform, d3.zoomIdentity);
```
To smoothly reset the zoom transform to the identity transform over 750 milliseconds:
```js
selection.transition().duration(750).call(zoom.transform, d3.zoomIdentity);
```
This method requires that you specify the new zoom transform completely, and does not enforce the defined [scale extent](#zoom_scaleExtent) and [translate extent](#zoom_translateExtent), if any. To derive a new transform from the existing transform, and to enforce the scale and translate extents, see the convenience methods [*zoom*.translateBy](#zoom_translateBy), [*zoom*.scaleBy](#zoom_scaleBy) and [*zoom*.scaleTo](#zoom_scaleTo).
<a href="#zoom_translateBy" name="zoom_translateBy">#</a> <i>zoom</i>.<b>translateBy</b>(<i>selection</i>, <i>x</i>, <i>y</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *selection* is a selection, [translates](#transform_translate) the [current zoom transform](#zoomTransform) of the selected elements by *x* and *y*, such that the new *t<sub>x1</sub>* = *t<sub>x0</sub>* + *kx* and *t<sub>y1</sub>* = *t<sub>y0</sub>* + *ky*. If *selection* is a transition, defines a “zoom” tween translating the current transform. This method is a convenience method for [*zoom*.transform](#zoom_transform). The *x* and *y* translation amounts may be specified either as numbers or as functions that return numbers. If a function, it is invoked for each selected element, being passed the current datum `d` and index `i`, with the `this` context as the current DOM element.
<a href="#zoom_translateTo" name="zoom_translateTo">#</a> <i>zoom</i>.<b>translateTo</b>(<i>selection</i>, <i>x</i>, <i>y</i>[, <i>p</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *selection* is a selection, [translates](#transform_translate) the [current zoom transform](#zoomTransform) of the selected elements such that the given position ⟨*x*,*y*⟩ appears at given point *p*. The new *t<sub>x</sub>* = *p<sub>x</sub>* - *kx* and *t<sub>y</sub>* = *p<sub>y</sub>* - *ky*. If *p* is not specified, it defaults to the center of the viewport [extent](#zoom_extent). If *selection* is a transition, defines a “zoom” tween translating the current transform. This method is a convenience method for [*zoom*.transform](#zoom_transform). The *x* and *y* coordinates may be specified either as numbers or as functions that returns numbers; similarly the *p* point may be specified either as a two-element array [*p<sub>x</sub>*,*p<sub>y</sub>*] or a function. If a function, it is invoked for each selected element, being passed the current datum `d` and index `i`, with the `this` context as the current DOM element.
<a href="#zoom_scaleBy" name="zoom_scaleBy">#</a> <i>zoom</i>.<b>scaleBy</b>(<i>selection</i>, <i>k</i>[, <i>p</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *selection* is a selection, [scales](#transform_scale) the [current zoom transform](#zoomTransform) of the selected elements by *k*, such that the new *k₁* = *k₀k*. The reference point *p* does move. If *p* is not specified, it defaults to the center of the viewport [extent](#zoom_extent). If *selection* is a transition, defines a “zoom” tween translating the current transform. This method is a convenience method for [*zoom*.transform](#zoom_transform). The *k* scale factor may be specified either as a number or a function that returns a number; similarly the *p* point may be specified either as a two-element array [*p<sub>x</sub>*,*p<sub>y</sub>*] or a function. If a function, it is invoked for each selected element, being passed the current datum `d` and index `i`, with the `this` context as the current DOM element.
<a href="#zoom_scaleTo" name="zoom_scaleTo">#</a> <i>zoom</i>.<b>scaleTo</b>(<i>selection</i>, <i>k</i>[, <i>p</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *selection* is a selection, [scales](#transform_scale) the [current zoom transform](#zoomTransform) of the selected elements to *k*, such that the new *k₁* = *k*. The reference point *p* does move. If *p* is not specified, it defaults to the center of the viewport [extent](#zoom_extent). If *selection* is a transition, defines a “zoom” tween translating the current transform. This method is a convenience method for [*zoom*.transform](#zoom_transform). The *k* scale factor may be specified either as a number or a function that returns a number; similarly the *p* point may be specified either as a two-element array [*p<sub>x</sub>*,*p<sub>y</sub>*] or a function. If a function, it is invoked for each selected element, being passed the current datum `d` and index `i`, with the `this` context as the current DOM element.
<a href="#zoom_constrain" name="zoom_constrain">#</a> <i>zoom</i>.<b>constrain</b>([<i>constrain</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *constrain* is specified, sets the transform constraint function to the specified function and returns the zoom behavior. If *constrain* is not specified, returns the current constraint function, which defaults to:
```js
function constrain(transform, extent, translateExtent) {
var dx0 = transform.invertX(extent[0][0]) - translateExtent[0][0],
dx1 = transform.invertX(extent[1][0]) - translateExtent[1][0],
dy0 = transform.invertY(extent[0][1]) - translateExtent[0][1],
dy1 = transform.invertY(extent[1][1]) - translateExtent[1][1];
return transform.translate(
dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1),
dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1)
);
}
```
The constraint function must return a [*transform*](#zoom-transforms) given the current *transform*, [viewport extent](#zoom_extent) and [translate extent](#zoom_translateExtent). The default implementation attempts to ensure that the viewport extent does not go outside the translate extent.
<a href="#zoom_filter" name="zoom_filter">#</a> <i>zoom</i>.<b>filter</b>([<i>filter</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *filter* is specified, sets the filter to the specified function and returns the zoom behavior. If *filter* is not specified, returns the current filter, which defaults to:
```js
function filter(event) {
return !event.ctrlKey && !event.button;
}
```
The filter is passed the current event (`event`) and datum `d`, with the `this` context as the current DOM element. If the filter returns falsey, the initiating event is ignored and no zoom gestures are started. Thus, the filter determines which input events are ignored. The default filter ignores mousedown events on secondary buttons, since those buttons are typically intended for other purposes, such as the context menu.
<a href="#zoom_touchable" name="zoom_touchable">#</a> <i>zoom</i>.<b>touchable</b>([<i>touchable</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *touchable* is specified, sets the touch support detector to the specified function and returns the zoom behavior. If *touchable* is not specified, returns the current touch support detector, which defaults to:
```js
function touchable() {
return navigator.maxTouchPoints || ("ontouchstart" in this);
}
```
Touch event listeners are only registered if the detector returns truthy for the corresponding element when the zoom behavior is [applied](#_zoom). The default detector works well for most browsers that are capable of touch input, but not all; Chrome’s mobile device emulator, for example, fails detection.
<a href="#zoom_wheelDelta" name="zoom_wheelDelta">#</a> <i>zoom</i>.<b>wheelDelta</b>([<i>delta</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *delta* is specified, sets the wheel delta function to the specified function and returns the zoom behavior. If *delta* is not specified, returns the current wheel delta function, which defaults to:
```js
function wheelDelta(event) {
return -event.deltaY * (event.deltaMode === 1 ? 0.05 : event.deltaMode ? 1 : 0.002);
}
```
The value *Δ* returned by the wheel delta function determines the amount of scaling applied in response to a [WheelEvent](https://developer.mozilla.org/en-US/docs/Web/API/WheelEvent). The scale factor [*transform*.k](#zoomTransform) is multiplied by 2<sup>*Δ*</sup>; for example, a *Δ* of +1 doubles the scale factor, *Δ* of -1 halves the scale factor.
<a href="#zoom_extent" name="zoom_extent">#</a> <i>zoom</i>.<b>extent</b>([<i>extent</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *extent* is specified, sets the viewport extent to the specified array of points [[*x0*, *y0*], [*x1*, *y1*]], where [*x0*, *y0*] is the top-left corner of the viewport and [*x1*, *y1*] is the bottom-right corner of the viewport, and returns this zoom behavior. The *extent* may also be specified as a function which returns such an array; if a function, it is invoked for each selected element, being passed the current datum `d`, with the `this` context as the current DOM element.
If *extent* is not specified, returns the current extent accessor, which defaults to [[0, 0], [*width*, *height*]] where *width* is the [client width](https://developer.mozilla.org/en-US/docs/Web/API/Element/clientWidth) of the element and *height* is its [client height](https://developer.mozilla.org/en-US/docs/Web/API/Element/clientHeight); for SVG elements, the nearest ancestor SVG element’s viewBox, or [width](https://www.w3.org/TR/SVG/struct.html#SVGElementWidthAttribute) and [height](https://www.w3.org/TR/SVG/struct.html#SVGElementHeightAttribute) attributes, are used. Alternatively, consider using [*element*.getBoundingClientRect](https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect).
The viewport extent affects several functions: the center of the viewport remains fixed during changes by [*zoom*.scaleBy](#zoom_scaleBy) and [*zoom*.scaleTo](#zoom_scaleTo); the viewport center and dimensions affect the path chosen by [d3.interpolateZoom](https://github.com/d3/d3-interpolate#interpolateZoom); and the viewport extent is needed to enforce the optional [translate extent](#zoom_translateExtent).
<a href="#zoom_scaleExtent" name="zoom_scaleExtent">#</a> <i>zoom</i>.<b>scaleExtent</b>([<i>extent</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *extent* is specified, sets the scale extent to the specified array of numbers [*k0*, *k1*] where *k0* is the minimum allowed scale factor and *k1* is the maximum allowed scale factor, and returns this zoom behavior. If *extent* is not specified, returns the current scale extent, which defaults to [0, ∞]. The scale extent restricts zooming in and out. It is enforced on interaction and when using [*zoom*.scaleBy](#zoom_scaleBy), [*zoom*.scaleTo](#zoom_scaleTo) and [*zoom*.translateBy](#zoom_translateBy); however, it is not enforced when using [*zoom*.transform](#zoom_transform) to set the transform explicitly.
If the user tries to zoom by wheeling when already at the corresponding limit of the scale extent, the wheel events will be ignored and not initiate a zoom gesture. This allows the user to scroll down past a zoomable area after zooming in, or to scroll up after zooming out. If you would prefer to always prevent scrolling on wheel input regardless of the scale extent, register a wheel event listener to prevent the browser default behavior:
```js
selection
.call(zoom)
.on("wheel", event => event.preventDefault());
```
<a href="#zoom_translateExtent" name="zoom_translateExtent">#</a> <i>zoom</i>.<b>translateExtent</b>([<i>extent</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *extent* is specified, sets the translate extent to the specified array of points [[*x0*, *y0*], [*x1*, *y1*]], where [*x0*, *y0*] is the top-left corner of the world and [*x1*, *y1*] is the bottom-right corner of the world, and returns this zoom behavior. If *extent* is not specified, returns the current translate extent, which defaults to [[-∞, -∞], [+∞, +∞]]. The translate extent restricts panning, and may cause translation on zoom out. It is enforced on interaction and when using [*zoom*.scaleBy](#zoom_scaleBy), [*zoom*.scaleTo](#zoom_scaleTo) and [*zoom*.translateBy](#zoom_translateBy); however, it is not enforced when using [*zoom*.transform](#zoom_transform) to set the transform explicitly.
<a href="#zoom_clickDistance" name="zoom_clickDistance">#</a> <i>zoom</i>.<b>clickDistance</b>([<i>distance</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *distance* is specified, sets the maximum distance that the mouse can move between mousedown and mouseup that will trigger a subsequent click event. If at any point between mousedown and mouseup the mouse is greater than or equal to *distance* from its position on mousedown, the click event following mouseup will be suppressed. If *distance* is not specified, returns the current distance threshold, which defaults to zero. The distance threshold is measured in client coordinates ([*event*.clientX](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/clientX) and [*event*.clientY](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/clientY)).
<a href="#zoom_tapDistance" name="zoom_tapDistance">#</a> <i>zoom</i>.<b>tapDistance</b>([<i>distance</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *distance* is specified, sets the maximum distance that a double-tap gesture can move between first touchstart and second touchend that will trigger a subsequent double-click event. If *distance* is not specified, returns the current distance threshold, which defaults to 10. The distance threshold is measured in client coordinates ([*event*.clientX](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/clientX) and [*event*.clientY](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/clientY)).
<a href="#zoom_duration" name="zoom_duration">#</a> <i>zoom</i>.<b>duration</b>([<i>duration</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *duration* is specified, sets the duration for zoom transitions on double-click and double-tap to the specified number of milliseconds and returns the zoom behavior. If *duration* is not specified, returns the current duration, which defaults to 250 milliseconds. If the duration is not greater than zero, double-click and -tap trigger instantaneous changes to the zoom transform rather than initiating smooth transitions.
To disable double-click and double-tap transitions, you can remove the zoom behavior’s dblclick event listener after applying the zoom behavior to the selection:
```js
selection
.call(zoom)
.on("dblclick.zoom", null);
```
<a href="#zoom_interpolate" name="zoom_interpolate">#</a> <i>zoom</i>.<b>interpolate</b>([<i>interpolate</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *interpolate* is specified, sets the interpolation factory for zoom transitions to the specified function. If *interpolate* is not specified, returns the current interpolation factory, which defaults to [d3.interpolateZoom](https://github.com/d3/d3-interpolate#interpolateZoom) to implement smooth zooming. To apply direct interpolation between two views, try [d3.interpolate](https://github.com/d3/d3-interpolate#interpolate) instead.
<a href="#zoom_on" name="zoom_on">#</a> <i>zoom</i>.<b>on</b>(<i>typenames</i>[, <i>listener</i>]) · [Source](https://github.com/d3/d3-zoom/blob/master/src/zoom.js)
If *listener* is specified, sets the event *listener* for the specified *typenames* and returns the zoom behavior. If an event listener was already registered for the same type and name, the existing listener is removed before the new listener is added. If *listener* is null, removes the current event listeners for the specified *typenames*, if any. If *listener* is not specified, returns the first currently-assigned listener matching the specified *typenames*, if any. When a specified event is dispatched, each *listener* will be invoked with the same context and arguments as [*selection*.on](https://github.com/d3/d3-selection#selection_on) listeners: the current event (`event`) and datum `d`, with the `this` context as the current DOM element.
The *typenames* is a string containing one or more *typename* separated by whitespace. Each *typename* is a *type*, optionally followed by a period (`.`) and a *name*, such as `zoom.foo` and `zoom.bar`; the name allows multiple listeners to be registered for the same *type*. The *type* must be one of the following:
* `start` - after zooming begins (such as on mousedown).
* `zoom` - after a change to the zoom transform (such as on mousemove).
* `end` - after zooming ends (such as on mouseup ).
See [*dispatch*.on](https://github.com/d3/d3-dispatch#dispatch_on) for more.
### Zoom Events
When a [zoom event listener](#zoom_on) is invoked, it receives the current zoom event as a first argument. The *event* object exposes several fields:
* *event*.target - the associated [zoom behavior](#zoom).
* *event*.type - the string “start”, “zoom” or “end”; see [*zoom*.on](#zoom_on).
* *event*.transform - the current [zoom transform](#zoom-transforms).
* *event*.sourceEvent - the underlying input event, such as mousemove or touchmove.
### Zoom Transforms
The zoom behavior stores the zoom state on the element to which the zoom behavior was [applied](#_zoom), not on the zoom behavior itself. This is because the zoom behavior can be applied to many elements simultaneously, and each element can be zoomed independently. The zoom state can change either on user interaction or programmatically via [*zoom*.transform](#zoom_transform).
To retrieve the zoom state, use *event*.transform on the current [zoom event](#zoom-events) within a zoom event listener (see [*zoom*.on](#zoom_on)), or use [d3.zoomTransform](#zoomTransform) for a given node. The latter is particularly useful for modifying the zoom state programmatically, say to implement buttons for zooming in and out.
<a href="#zoomTransform" name="zoomTransform">#</a> d3.<b>zoomTransform</b>(<i>node</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
Returns the current transform for the specified *node*. Note that *node* should typically be a DOM element, not a *selection*. (A selection may consist of multiple nodes, in different states, and this function only returns a single transform.) If you have a selection, call [*selection*.node](https://github.com/d3/d3-selection#selection_node) first:
```js
var transform = d3.zoomTransform(selection.node());
```
In the context of an [event listener](https://github.com/d3/d3-selection#selection_on), the *node* is typically the element that received the input event (which should be equal to [*event*.transform](#zoom-events)), *this*:
```js
var transform = d3.zoomTransform(this);
```
Internally, an element’s transform is stored as *element*.\_\_zoom; however, you should use this method rather than accessing it directly. If the given *node* has no defined transform, returns the transform of the closest ancestor, or if none exists, the [identity transformation](#zoomIdentity). The returned transform represents a two-dimensional [transformation matrix](https://en.wikipedia.org/wiki/Transformation_matrix#Affine_transformations) of the form:
*k* 0 *t<sub>x</sub>*
<br>0 *k* *t<sub>y</sub>*
<br>0 0 1
(This matrix is capable of representing only scale and translation; a future release may also allow rotation, though this would probably not be a backwards-compatible change.) The position ⟨*x*,*y*⟩ is transformed to ⟨*xk* + *t<sub>x</sub>*,*yk* + *t<sub>y</sub>*⟩. The transform object exposes the following properties:
* *transform*.x - the translation amount *t<sub>x</sub>* along the *x*-axis.
* *transform*.y - the translation amount *t<sub>y</sub>* along the *y*-axis.
* *transform*.k - the scale factor *k*.
These properties should be considered read-only; instead of mutating a transform, use [*transform*.scale](#transform_scale) and [*transform*.translate](#transform_translate) to derive a new transform. Also see [*zoom*.scaleBy](#zoom_scaleBy), [*zoom*.scaleTo](#zoom_scaleTo) and [*zoom*.translateBy](#zoom_translateBy) for convenience methods on the zoom behavior. To create a transform with a given *k*, *t<sub>x</sub>*, and *t<sub>y</sub>*:
```js
var t = d3.zoomIdentity.translate(x, y).scale(k);
```
To apply the transformation to a [Canvas 2D context](https://www.w3.org/TR/2dcontext/), use [*context*.translate](https://www.w3.org/TR/2dcontext/#dom-context-2d-translate) followed by [*context*.scale](https://www.w3.org/TR/2dcontext/#dom-context-2d-scale):
```js
context.translate(transform.x, transform.y);
context.scale(transform.k, transform.k);
```
Similarly, to apply the transformation to HTML elements via [CSS](https://www.w3.org/TR/css-transforms-1/):
```js
div.style("transform", "translate(" + transform.x + "px," + transform.y + "px) scale(" + transform.k + ")");
div.style("transform-origin", "0 0");
```
To apply the transformation to [SVG](https://www.w3.org/TR/SVG/coords.html#TransformAttribute):
```js
g.attr("transform", "translate(" + transform.x + "," + transform.y + ") scale(" + transform.k + ")");
```
Or more simply, taking advantage of [*transform*.toString](#transform_toString):
```js
g.attr("transform", transform);
```
Note that the order of transformations matters! The translate must be applied before the scale.
<a href="#transform_scale" name="transform_scale">#</a> <i>transform</i>.<b>scale</b>(<i>k</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
Returns a transform whose scale *k₁* is equal to *k₀k*, where *k₀* is this transform’s scale.
<a href="#transform_translate" name="transform_translate">#</a> <i>transform</i>.<b>translate</b>(<i>x</i>, <i>y</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
Returns a transform whose translation *t<sub>x1</sub>* and *t<sub>y1</sub>* is equal to *t<sub>x0</sub>* + *t<sub>k</sub> x* and *t<sub>y0</sub>* + *t<sub>k</sub> y*, where *t<sub>x0</sub>* and *t<sub>y0</sub>* is this transform’s translation and *t<sub>k</sub>* is this transform’s scale.
<a href="#transform_apply" name="transform_apply">#</a> <i>transform</i>.<b>apply</b>(<i>point</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
Returns the transformation of the specified *point* which is a two-element array of numbers [*x*, *y*]. The returned point is equal to [*xk* + *t<sub>x</sub>*, *yk* + *t<sub>y</sub>*].
<a href="#transform_applyX" name="transform_applyX">#</a> <i>transform</i>.<b>applyX</b>(<i>x</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
Returns the transformation of the specified *x*-coordinate, *xk* + *t<sub>x</sub>*.
<a href="#transform_applyY" name="transform_applyY">#</a> <i>transform</i>.<b>applyY</b>(<i>y</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
Returns the transformation of the specified *y*-coordinate, *yk* + *t<sub>y</sub>*.
<a href="#transform_invert" name="transform_invert">#</a> <i>transform</i>.<b>invert</b>(<i>point</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
Returns the inverse transformation of the specified *point* which is a two-element array of numbers [*x*, *y*]. The returned point is equal to [(*x* - *t<sub>x</sub>*) / *k*, (*y* - *t<sub>y</sub>*) / *k*].
<a href="#transform_invertX" name="transform_invertX">#</a> <i>transform</i>.<b>invertX</b>(<i>x</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
Returns the inverse transformation of the specified *x*-coordinate, (*x* - *t<sub>x</sub>*) / *k*.
<a href="#transform_invertY" name="transform_invertY">#</a> <i>transform</i>.<b>invertY</b>(<i>y</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
Returns the inverse transformation of the specified *y*-coordinate, (*y* - *t<sub>y</sub>*) / *k*.
<a href="#transform_rescaleX" name="transform_rescaleX">#</a> <i>transform</i>.<b>rescaleX</b>(<i>x</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
Returns a [copy](https://github.com/d3/d3-scale#continuous_copy) of the [continuous scale](https://github.com/d3/d3-scale#continuous-scales) *x* whose [domain](https://github.com/d3/d3-scale#continuous_domain) is transformed. This is implemented by first applying the [inverse *x*-transform](#transform_invertX) on the scale’s [range](https://github.com/d3/d3-scale#continuous_range), and then applying the [inverse scale](https://github.com/d3/d3-scale#continuous_invert) to compute the corresponding domain:
```js
function rescaleX(x) {
var range = x.range().map(transform.invertX, transform),
domain = range.map(x.invert, x);
return x.copy().domain(domain);
}
```
The scale *x* must use [d3.interpolateNumber](https://github.com/d3/d3-interpolate#interpolateNumber); do not use [*continuous*.rangeRound](https://github.com/d3/d3-scale#continuous_rangeRound) as this reduces the accuracy of [*continuous*.invert](https://github.com/d3/d3-scale#continuous_invert) and can lead to an inaccurate rescaled domain. This method does not modify the input scale *x*; *x* thus represents the untransformed scale, while the returned scale represents its transformed view.
<a href="#transform_rescaleY" name="transform_rescaleY">#</a> <i>transform</i>.<b>rescaleY</b>(<i>y</i>) · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
Returns a [copy](https://github.com/d3/d3-scale#continuous_copy) of the [continuous scale](https://github.com/d3/d3-scale#continuous-scales) *y* whose [domain](https://github.com/d3/d3-scale#continuous_domain) is transformed. This is implemented by first applying the [inverse *y*-transform](#transform_invertY) on the scale’s [range](https://github.com/d3/d3-scale#continuous_range), and then applying the [inverse scale](https://github.com/d3/d3-scale#continuous_invert) to compute the corresponding domain:
```js
function rescaleY(y) {
var range = y.range().map(transform.invertY, transform),
domain = range.map(y.invert, y);
return y.copy().domain(domain);
}
```
The scale *y* must use [d3.interpolateNumber](https://github.com/d3/d3-interpolate#interpolateNumber); do not use [*continuous*.rangeRound](https://github.com/d3/d3-scale#continuous_rangeRound) as this reduces the accuracy of [*continuous*.invert](https://github.com/d3/d3-scale#continuous_invert) and can lead to an inaccurate rescaled domain. This method does not modify the input scale *y*; *y* thus represents the untransformed scale, while the returned scale represents its transformed view.
<a href="#transform_toString" name="transform_toString">#</a> <i>transform</i>.<b>toString</b>() · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
Returns a string representing the [SVG transform](https://www.w3.org/TR/SVG/coords.html#TransformAttribute) corresponding to this transform. Implemented as:
```js
function toString() {
return "translate(" + this.x + "," + this.y + ") scale(" + this.k + ")";
}
```
<a href="#zoomIdentity" name="zoomIdentity">#</a> d3.<b>zoomIdentity</b> · [Source](https://github.com/d3/d3-zoom/blob/master/src/transform.js)
The identity transform, where *k* = 1, *t<sub>x</sub>* = *t<sub>y</sub>* = 0.

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@@ -0,0 +1,530 @@
// https://d3js.org/d3-zoom/ v2.0.0 Copyright 2020 Mike Bostock
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('d3-dispatch'), require('d3-drag'), require('d3-interpolate'), require('d3-selection'), require('d3-transition')) :
typeof define === 'function' && define.amd ? define(['exports', 'd3-dispatch', 'd3-drag', 'd3-interpolate', 'd3-selection', 'd3-transition'], factory) :
(global = global || self, factory(global.d3 = global.d3 || {}, global.d3, global.d3, global.d3, global.d3, global.d3));
}(this, (function (exports, d3Dispatch, d3Drag, d3Interpolate, d3Selection, d3Transition) { 'use strict';
var constant = x => () => x;
function ZoomEvent(type, {
sourceEvent,
target,
transform,
dispatch
}) {
Object.defineProperties(this, {
type: {value: type, enumerable: true, configurable: true},
sourceEvent: {value: sourceEvent, enumerable: true, configurable: true},
target: {value: target, enumerable: true, configurable: true},
transform: {value: transform, enumerable: true, configurable: true},
_: {value: dispatch}
});
}
function Transform(k, x, y) {
this.k = k;
this.x = x;
this.y = y;
}
Transform.prototype = {
constructor: Transform,
scale: function(k) {
return k === 1 ? this : new Transform(this.k * k, this.x, this.y);
},
translate: function(x, y) {
return x === 0 & y === 0 ? this : new Transform(this.k, this.x + this.k * x, this.y + this.k * y);
},
apply: function(point) {
return [point[0] * this.k + this.x, point[1] * this.k + this.y];
},
applyX: function(x) {
return x * this.k + this.x;
},
applyY: function(y) {
return y * this.k + this.y;
},
invert: function(location) {
return [(location[0] - this.x) / this.k, (location[1] - this.y) / this.k];
},
invertX: function(x) {
return (x - this.x) / this.k;
},
invertY: function(y) {
return (y - this.y) / this.k;
},
rescaleX: function(x) {
return x.copy().domain(x.range().map(this.invertX, this).map(x.invert, x));
},
rescaleY: function(y) {
return y.copy().domain(y.range().map(this.invertY, this).map(y.invert, y));
},
toString: function() {
return "translate(" + this.x + "," + this.y + ") scale(" + this.k + ")";
}
};
var identity = new Transform(1, 0, 0);
transform.prototype = Transform.prototype;
function transform(node) {
while (!node.__zoom) if (!(node = node.parentNode)) return identity;
return node.__zoom;
}
function nopropagation(event) {
event.stopImmediatePropagation();
}
function noevent(event) {
event.preventDefault();
event.stopImmediatePropagation();
}
// Ignore right-click, since that should open the context menu.
// except for pinch-to-zoom, which is sent as a wheel+ctrlKey event
function defaultFilter(event) {
return (!event.ctrlKey || event.type === 'wheel') && !event.button;
}
function defaultExtent() {
var e = this;
if (e instanceof SVGElement) {
e = e.ownerSVGElement || e;
if (e.hasAttribute("viewBox")) {
e = e.viewBox.baseVal;
return [[e.x, e.y], [e.x + e.width, e.y + e.height]];
}
return [[0, 0], [e.width.baseVal.value, e.height.baseVal.value]];
}
return [[0, 0], [e.clientWidth, e.clientHeight]];
}
function defaultTransform() {
return this.__zoom || identity;
}
function defaultWheelDelta(event) {
return -event.deltaY * (event.deltaMode === 1 ? 0.05 : event.deltaMode ? 1 : 0.002) * (event.ctrlKey ? 10 : 1);
}
function defaultTouchable() {
return navigator.maxTouchPoints || ("ontouchstart" in this);
}
function defaultConstrain(transform, extent, translateExtent) {
var dx0 = transform.invertX(extent[0][0]) - translateExtent[0][0],
dx1 = transform.invertX(extent[1][0]) - translateExtent[1][0],
dy0 = transform.invertY(extent[0][1]) - translateExtent[0][1],
dy1 = transform.invertY(extent[1][1]) - translateExtent[1][1];
return transform.translate(
dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1),
dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1)
);
}
function zoom() {
var filter = defaultFilter,
extent = defaultExtent,
constrain = defaultConstrain,
wheelDelta = defaultWheelDelta,
touchable = defaultTouchable,
scaleExtent = [0, Infinity],
translateExtent = [[-Infinity, -Infinity], [Infinity, Infinity]],
duration = 250,
interpolate = d3Interpolate.interpolateZoom,
listeners = d3Dispatch.dispatch("start", "zoom", "end"),
touchstarting,
touchfirst,
touchending,
touchDelay = 500,
wheelDelay = 150,
clickDistance2 = 0,
tapDistance = 10;
function zoom(selection) {
selection
.property("__zoom", defaultTransform)
.on("wheel.zoom", wheeled)
.on("mousedown.zoom", mousedowned)
.on("dblclick.zoom", dblclicked)
.filter(touchable)
.on("touchstart.zoom", touchstarted)
.on("touchmove.zoom", touchmoved)
.on("touchend.zoom touchcancel.zoom", touchended)
.style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
}
zoom.transform = function(collection, transform, point, event) {
var selection = collection.selection ? collection.selection() : collection;
selection.property("__zoom", defaultTransform);
if (collection !== selection) {
schedule(collection, transform, point, event);
} else {
selection.interrupt().each(function() {
gesture(this, arguments)
.event(event)
.start()
.zoom(null, typeof transform === "function" ? transform.apply(this, arguments) : transform)
.end();
});
}
};
zoom.scaleBy = function(selection, k, p, event) {
zoom.scaleTo(selection, function() {
var k0 = this.__zoom.k,
k1 = typeof k === "function" ? k.apply(this, arguments) : k;
return k0 * k1;
}, p, event);
};
zoom.scaleTo = function(selection, k, p, event) {
zoom.transform(selection, function() {
var e = extent.apply(this, arguments),
t0 = this.__zoom,
p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p,
p1 = t0.invert(p0),
k1 = typeof k === "function" ? k.apply(this, arguments) : k;
return constrain(translate(scale(t0, k1), p0, p1), e, translateExtent);
}, p, event);
};
zoom.translateBy = function(selection, x, y, event) {
zoom.transform(selection, function() {
return constrain(this.__zoom.translate(
typeof x === "function" ? x.apply(this, arguments) : x,
typeof y === "function" ? y.apply(this, arguments) : y
), extent.apply(this, arguments), translateExtent);
}, null, event);
};
zoom.translateTo = function(selection, x, y, p, event) {
zoom.transform(selection, function() {
var e = extent.apply(this, arguments),
t = this.__zoom,
p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p;
return constrain(identity.translate(p0[0], p0[1]).scale(t.k).translate(
typeof x === "function" ? -x.apply(this, arguments) : -x,
typeof y === "function" ? -y.apply(this, arguments) : -y
), e, translateExtent);
}, p, event);
};
function scale(transform, k) {
k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], k));
return k === transform.k ? transform : new Transform(k, transform.x, transform.y);
}
function translate(transform, p0, p1) {
var x = p0[0] - p1[0] * transform.k, y = p0[1] - p1[1] * transform.k;
return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y);
}
function centroid(extent) {
return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
}
function schedule(transition, transform, point, event) {
transition
.on("start.zoom", function() { gesture(this, arguments).event(event).start(); })
.on("interrupt.zoom end.zoom", function() { gesture(this, arguments).event(event).end(); })
.tween("zoom", function() {
var that = this,
args = arguments,
g = gesture(that, args).event(event),
e = extent.apply(that, args),
p = point == null ? centroid(e) : typeof point === "function" ? point.apply(that, args) : point,
w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
a = that.__zoom,
b = typeof transform === "function" ? transform.apply(that, args) : transform,
i = interpolate(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
return function(t) {
if (t === 1) t = b; // Avoid rounding error on end.
else { var l = i(t), k = w / l[2]; t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k); }
g.zoom(null, t);
};
});
}
function gesture(that, args, clean) {
return (!clean && that.__zooming) || new Gesture(that, args);
}
function Gesture(that, args) {
this.that = that;
this.args = args;
this.active = 0;
this.sourceEvent = null;
this.extent = extent.apply(that, args);
this.taps = 0;
}
Gesture.prototype = {
event: function(event) {
if (event) this.sourceEvent = event;
return this;
},
start: function() {
if (++this.active === 1) {
this.that.__zooming = this;
this.emit("start");
}
return this;
},
zoom: function(key, transform) {
if (this.mouse && key !== "mouse") this.mouse[1] = transform.invert(this.mouse[0]);
if (this.touch0 && key !== "touch") this.touch0[1] = transform.invert(this.touch0[0]);
if (this.touch1 && key !== "touch") this.touch1[1] = transform.invert(this.touch1[0]);
this.that.__zoom = transform;
this.emit("zoom");
return this;
},
end: function() {
if (--this.active === 0) {
delete this.that.__zooming;
this.emit("end");
}
return this;
},
emit: function(type) {
var d = d3Selection.select(this.that).datum();
listeners.call(
type,
this.that,
new ZoomEvent(type, {
sourceEvent: this.sourceEvent,
target: zoom,
type,
transform: this.that.__zoom,
dispatch: listeners
}),
d
);
}
};
function wheeled(event, ...args) {
if (!filter.apply(this, arguments)) return;
var g = gesture(this, args).event(event),
t = this.__zoom,
k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], t.k * Math.pow(2, wheelDelta.apply(this, arguments)))),
p = d3Selection.pointer(event);
// If the mouse is in the same location as before, reuse it.
// If there were recent wheel events, reset the wheel idle timeout.
if (g.wheel) {
if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) {
g.mouse[1] = t.invert(g.mouse[0] = p);
}
clearTimeout(g.wheel);
}
// If this wheel event won’t trigger a transform change, ignore it.
else if (t.k === k) return;
// Otherwise, capture the mouse point and location at the start.
else {
g.mouse = [p, t.invert(p)];
d3Transition.interrupt(this);
g.start();
}
noevent(event);
g.wheel = setTimeout(wheelidled, wheelDelay);
g.zoom("mouse", constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent, translateExtent));
function wheelidled() {
g.wheel = null;
g.end();
}
}
function mousedowned(event, ...args) {
if (touchending || !filter.apply(this, arguments)) return;
var g = gesture(this, args, true).event(event),
v = d3Selection.select(event.view).on("mousemove.zoom", mousemoved, true).on("mouseup.zoom", mouseupped, true),
p = d3Selection.pointer(event, currentTarget),
currentTarget = event.currentTarget,
x0 = event.clientX,
y0 = event.clientY;
d3Drag.dragDisable(event.view);
nopropagation(event);
g.mouse = [p, this.__zoom.invert(p)];
d3Transition.interrupt(this);
g.start();
function mousemoved(event) {
noevent(event);
if (!g.moved) {
var dx = event.clientX - x0, dy = event.clientY - y0;
g.moved = dx * dx + dy * dy > clickDistance2;
}
g.event(event)
.zoom("mouse", constrain(translate(g.that.__zoom, g.mouse[0] = d3Selection.pointer(event, currentTarget), g.mouse[1]), g.extent, translateExtent));
}
function mouseupped(event) {
v.on("mousemove.zoom mouseup.zoom", null);
d3Drag.dragEnable(event.view, g.moved);
noevent(event);
g.event(event).end();
}
}
function dblclicked(event, ...args) {
if (!filter.apply(this, arguments)) return;
var t0 = this.__zoom,
p0 = d3Selection.pointer(event.changedTouches ? event.changedTouches[0] : event, this),
p1 = t0.invert(p0),
k1 = t0.k * (event.shiftKey ? 0.5 : 2),
t1 = constrain(translate(scale(t0, k1), p0, p1), extent.apply(this, args), translateExtent);
noevent(event);
if (duration > 0) d3Selection.select(this).transition().duration(duration).call(schedule, t1, p0, event);
else d3Selection.select(this).call(zoom.transform, t1, p0, event);
}
function touchstarted(event, ...args) {
if (!filter.apply(this, arguments)) return;
var touches = event.touches,
n = touches.length,
g = gesture(this, args, event.changedTouches.length === n).event(event),
started, i, t, p;
nopropagation(event);
for (i = 0; i < n; ++i) {
t = touches[i], p = d3Selection.pointer(t, this);
p = [p, this.__zoom.invert(p), t.identifier];
if (!g.touch0) g.touch0 = p, started = true, g.taps = 1 + !!touchstarting;
else if (!g.touch1 && g.touch0[2] !== p[2]) g.touch1 = p, g.taps = 0;
}
if (touchstarting) touchstarting = clearTimeout(touchstarting);
if (started) {
if (g.taps < 2) touchfirst = p[0], touchstarting = setTimeout(function() { touchstarting = null; }, touchDelay);
d3Transition.interrupt(this);
g.start();
}
}
function touchmoved(event, ...args) {
if (!this.__zooming) return;
var g = gesture(this, args).event(event),
touches = event.changedTouches,
n = touches.length, i, t, p, l;
noevent(event);
for (i = 0; i < n; ++i) {
t = touches[i], p = d3Selection.pointer(t, this);
if (g.touch0 && g.touch0[2] === t.identifier) g.touch0[0] = p;
else if (g.touch1 && g.touch1[2] === t.identifier) g.touch1[0] = p;
}
t = g.that.__zoom;
if (g.touch1) {
var p0 = g.touch0[0], l0 = g.touch0[1],
p1 = g.touch1[0], l1 = g.touch1[1],
dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp,
dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl;
t = scale(t, Math.sqrt(dp / dl));
p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
}
else if (g.touch0) p = g.touch0[0], l = g.touch0[1];
else return;
g.zoom("touch", constrain(translate(t, p, l), g.extent, translateExtent));
}
function touchended(event, ...args) {
if (!this.__zooming) return;
var g = gesture(this, args).event(event),
touches = event.changedTouches,
n = touches.length, i, t;
nopropagation(event);
if (touchending) clearTimeout(touchending);
touchending = setTimeout(function() { touchending = null; }, touchDelay);
for (i = 0; i < n; ++i) {
t = touches[i];
if (g.touch0 && g.touch0[2] === t.identifier) delete g.touch0;
else if (g.touch1 && g.touch1[2] === t.identifier) delete g.touch1;
}
if (g.touch1 && !g.touch0) g.touch0 = g.touch1, delete g.touch1;
if (g.touch0) g.touch0[1] = this.__zoom.invert(g.touch0[0]);
else {
g.end();
// If this was a dbltap, reroute to the (optional) dblclick.zoom handler.
if (g.taps === 2) {
t = d3Selection.pointer(t, this);
if (Math.hypot(touchfirst[0] - t[0], touchfirst[1] - t[1]) < tapDistance) {
var p = d3Selection.select(this).on("dblclick.zoom");
if (p) p.apply(this, arguments);
}
}
}
}
zoom.wheelDelta = function(_) {
return arguments.length ? (wheelDelta = typeof _ === "function" ? _ : constant(+_), zoom) : wheelDelta;
};
zoom.filter = function(_) {
return arguments.length ? (filter = typeof _ === "function" ? _ : constant(!!_), zoom) : filter;
};
zoom.touchable = function(_) {
return arguments.length ? (touchable = typeof _ === "function" ? _ : constant(!!_), zoom) : touchable;
};
zoom.extent = function(_) {
return arguments.length ? (extent = typeof _ === "function" ? _ : constant([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
};
zoom.scaleExtent = function(_) {
return arguments.length ? (scaleExtent[0] = +_[0], scaleExtent[1] = +_[1], zoom) : [scaleExtent[0], scaleExtent[1]];
};
zoom.translateExtent = function(_) {
return arguments.length ? (translateExtent[0][0] = +_[0][0], translateExtent[1][0] = +_[1][0], translateExtent[0][1] = +_[0][1], translateExtent[1][1] = +_[1][1], zoom) : [[translateExtent[0][0], translateExtent[0][1]], [translateExtent[1][0], translateExtent[1][1]]];
};
zoom.constrain = function(_) {
return arguments.length ? (constrain = _, zoom) : constrain;
};
zoom.duration = function(_) {
return arguments.length ? (duration = +_, zoom) : duration;
};
zoom.interpolate = function(_) {
return arguments.length ? (interpolate = _, zoom) : interpolate;
};
zoom.on = function() {
var value = listeners.on.apply(listeners, arguments);
return value === listeners ? zoom : value;
};
zoom.clickDistance = function(_) {
return arguments.length ? (clickDistance2 = (_ = +_) * _, zoom) : Math.sqrt(clickDistance2);
};
zoom.tapDistance = function(_) {
return arguments.length ? (tapDistance = +_, zoom) : tapDistance;
};
return zoom;
}
exports.zoom = zoom;
exports.zoomIdentity = identity;
exports.zoomTransform = transform;
Object.defineProperty(exports, '__esModule', { value: true });
})));

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Copyright 2010-2016 Mike Bostock
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of the author nor the names of contributors may be used to
endorse or promote products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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# d3-color
Even though your browser understands a lot about colors, it doesn’t offer much help in manipulating colors through JavaScript. The d3-color module therefore provides representations for various color spaces, allowing specification, conversion and manipulation. (Also see [d3-interpolate](https://github.com/d3/d3-interpolate) for color interpolation.)
For example, take the color named “steelblue”:
```js
var c = d3.color("steelblue"); // {r: 70, g: 130, b: 180, opacity: 1}
```
Let’s try converting it to HSL:
```js
var c = d3.hsl("steelblue"); // {h: 207.27…, s: 0.44, l: 0.4902…, opacity: 1}
```
Now rotate the hue by 90°, bump up the saturation, and format as a string for CSS:
```js
c.h += 90;
c.s += 0.2;
c + ""; // rgb(198, 45, 205)
```
To fade the color slightly:
```js
c.opacity = 0.8;
c + ""; // rgba(198, 45, 205, 0.8)
```
In addition to the ubiquitous and machine-friendly [RGB](#rgb) and [HSL](#hsl) color space, d3-color supports color spaces that are designed for humans:
* [CIELAB](#lab) (*a.k.a.* “Lab”)
* [CIELCh<sub>ab</sub>](#lch) (*a.k.a.* “LCh” or “HCL”)
* Dave Green’s [Cubehelix](#cubehelix)
Cubehelix features monotonic lightness, while CIELAB and its polar form CIELCh<sub>ab</sub> are perceptually uniform.
## Extensions
For additional color spaces, see:
* [d3-cam16](https://github.com/d3/d3-cam16)
* [d3-cam02](https://github.com/connorgr/d3-cam02)
* [d3-hsv](https://github.com/d3/d3-hsv)
* [d3-hcg](https://github.com/d3/d3-hcg)
* [d3-hsluv](https://github.com/petulla/d3-hsluv)
To measure color differences, see:
* [d3-color-difference](https://github.com/Evercoder/d3-color-difference)
## Installing
If you use NPM, `npm install d3-color`. Otherwise, download the [latest release](https://github.com/d3/d3-color/releases/latest). You can also load directly from [d3js.org](https://d3js.org), either as a [standalone library](https://d3js.org/d3-color.v2.min.js) or as part of [D3](https://github.com/d3/d3). AMD, CommonJS, and vanilla environments are supported. In vanilla, a `d3` global is exported:
```html
<script src="https://d3js.org/d3-color.v2.min.js"></script>
<script>
var steelblue = d3.rgb("steelblue");
</script>
```
[Try d3-color in your browser.](https://observablehq.com/collection/@d3/d3-color)
## API Reference
<a name="color" href="#color">#</a> d3.<b>color</b>(<i>specifier</i>) [<>](https://github.com/d3/d3-color/blob/master/src/color.js "Source")
Parses the specified [CSS Color Module Level 3](http://www.w3.org/TR/css3-color/#colorunits) *specifier* string, returning an [RGB](#rgb) or [HSL](#hsl) color, along with [CSS Color Module Level 4 hex](https://www.w3.org/TR/css-color-4/#hex-notation) *specifier* strings. If the specifier was not valid, null is returned. Some examples:
* `rgb(255, 255, 255)`
* `rgb(10%, 20%, 30%)`
* `rgba(255, 255, 255, 0.4)`
* `rgba(10%, 20%, 30%, 0.4)`
* `hsl(120, 50%, 20%)`
* `hsla(120, 50%, 20%, 0.4)`
* `#ffeeaa`
* `#fea`
* `#ffeeaa22`
* `#fea2`
* `steelblue`
The list of supported [named colors](http://www.w3.org/TR/SVG/types.html#ColorKeywords) is specified by CSS.
Note: this function may also be used with `instanceof` to test if an object is a color instance. The same is true of color subclasses, allowing you to test whether a color is in a particular color space.
<a name="color_opacity" href="#color_opacity">#</a> *color*.<b>opacity</b>
This color’s opacity, typically in the range [0, 1].
<a name="color_rgb" href="#color_rgb">#</a> *color*.<b>rgb</b>() [<>](https://github.com/d3/d3-color/blob/master/src/color.js "Source")
Returns the [RGB equivalent](#rgb) of this color. For RGB colors, that’s `this`.
<a name="color_copy" href="#color_copy">#</a> <i>color</i>.<b>copy</b>([<i>values</i>]) [<>](https://github.com/d3/d3-color/blob/master/src/color.js "Source")
Returns a copy of this color. If *values* is specified, any enumerable own properties of *values* are assigned to the new returned color. For example, to derive a copy of a *color* with opacity 0.5, say
```js
color.copy({opacity: 0.5})
```
<a name="color_brighter" href="#color_brighter">#</a> *color*.<b>brighter</b>([<i>k</i>]) [<>](https://github.com/d3/d3-color/blob/master/src/color.js "Source")
Returns a brighter copy of this color. If *k* is specified, it controls how much brighter the returned color should be. If *k* is not specified, it defaults to 1. The behavior of this method is dependent on the implementing color space.
<a name="color_darker" href="#color_darker">#</a> *color*.<b>darker</b>([<i>k</i>]) [<>](https://github.com/d3/d3-color/blob/master/src/color.js "Source")
Returns a darker copy of this color. If *k* is specified, it controls how much darker the returned color should be. If *k* is not specified, it defaults to 1. The behavior of this method is dependent on the implementing color space.
<a name="color_displayable" href="#color_displayable">#</a> *color*.<b>displayable</b>() [<>](https://github.com/d3/d3-color/blob/master/src/color.js "Source")
Returns true if and only if the color is displayable on standard hardware. For example, this returns false for an RGB color if any channel value is less than zero or greater than 255 when rounded, or if the opacity is not in the range [0, 1].
<a name="color_formatHex" href="#color_formatHex">#</a> *color*.<b>formatHex</b>() [<>](https://github.com/d3/d3-color/blob/master/src/color.js "Source")
Returns a hexadecimal string representing this color in RGB space, such as `#f7eaba`. If this color is not displayable, a suitable displayable color is returned instead. For example, RGB channel values greater than 255 are clamped to 255.
<a name="color_formatHsl" href="#color_formatHsl">#</a> *color*.<b>formatHsl</b>() [<>](https://github.com/d3/d3-color/blob/master/src/color.js "Source")
Returns a string representing this color according to the [CSS Color Module Level 3 specification](https://www.w3.org/TR/css-color-3/#hsl-color), such as `hsl(257, 50%, 80%)` or `hsla(257, 50%, 80%, 0.2)`. If this color is not displayable, a suitable displayable color is returned instead by clamping S and L channel values to the interval [0, 100].
<a name="color_formatRgb" href="#color_formatRgb">#</a> *color*.<b>formatRgb</b>() [<>](https://github.com/d3/d3-color/blob/master/src/color.js "Source")
Returns a string representing this color according to the [CSS Object Model specification](https://drafts.csswg.org/cssom/#serialize-a-css-component-value), such as `rgb(247, 234, 186)` or `rgba(247, 234, 186, 0.2)`. If this color is not displayable, a suitable displayable color is returned instead by clamping RGB channel values to the interval [0, 255].
<a name="color_toString" href="#color_toString">#</a> *color*.<b>toString</b>() [<>](https://github.com/d3/d3-color/blob/master/src/color.js "Source")
An alias for [*color*.formatRgb](#color_formatRgb).
<a name="rgb" href="#rgb">#</a> d3.<b>rgb</b>(<i>r</i>, <i>g</i>, <i>b</i>[, <i>opacity</i>]) [<>](https://github.com/d3/d3-color/blob/master/src/color.js "Source")<br>
<a href="#rgb">#</a> d3.<b>rgb</b>(<i>specifier</i>)<br>
<a href="#rgb">#</a> d3.<b>rgb</b>(<i>color</i>)<br>
Constructs a new [RGB](https://en.wikipedia.org/wiki/RGB_color_model) color. The channel values are exposed as `r`, `g` and `b` properties on the returned instance. Use the [RGB color picker](http://bl.ocks.org/mbostock/78d64ca7ef013b4dcf8f) to explore this color space.
If *r*, *g* and *b* are specified, these represent the channel values of the returned color; an *opacity* may also be specified. If a CSS Color Module Level 3 *specifier* string is specified, it is parsed and then converted to the RGB color space. See [color](#color) for examples. If a [*color*](#color) instance is specified, it is converted to the RGB color space using [*color*.rgb](#color_rgb). Note that unlike [*color*.rgb](#color_rgb) this method *always* returns a new instance, even if *color* is already an RGB color.
<a name="hsl" href="#hsl">#</a> d3.<b>hsl</b>(<i>h</i>, <i>s</i>, <i>l</i>[, <i>opacity</i>]) [<>](https://github.com/d3/d3-color/blob/master/src/color.js "Source")<br>
<a href="#hsl">#</a> d3.<b>hsl</b>(<i>specifier</i>)<br>
<a href="#hsl">#</a> d3.<b>hsl</b>(<i>color</i>)<br>
Constructs a new [HSL](https://en.wikipedia.org/wiki/HSL_and_HSV) color. The channel values are exposed as `h`, `s` and `l` properties on the returned instance. Use the [HSL color picker](http://bl.ocks.org/mbostock/debaad4fcce9bcee14cf) to explore this color space.
If *h*, *s* and *l* are specified, these represent the channel values of the returned color; an *opacity* may also be specified. If a CSS Color Module Level 3 *specifier* string is specified, it is parsed and then converted to the HSL color space. See [color](#color) for examples. If a [*color*](#color) instance is specified, it is converted to the RGB color space using [*color*.rgb](#color_rgb) and then converted to HSL. (Colors already in the HSL color space skip the conversion to RGB.)
<a name="lab" href="#lab">#</a> d3.<b>lab</b>(<i>l</i>, <i>a</i>, <i>b</i>[, <i>opacity</i>]) [<>](https://github.com/d3/d3-color/blob/master/src/lab.js "Source")<br>
<a href="#lab">#</a> d3.<b>lab</b>(<i>specifier</i>)<br>
<a href="#lab">#</a> d3.<b>lab</b>(<i>color</i>)<br>
Constructs a new [CIELAB](https://en.wikipedia.org/wiki/Lab_color_space#CIELAB) color. The channel values are exposed as `l`, `a` and `b` properties on the returned instance. Use the [CIELAB color picker](http://bl.ocks.org/mbostock/9f37cc207c0cb166921b) to explore this color space. The value of *l* is typically in the range [0, 100], while *a* and *b* are typically in [-160, +160].
If *l*, *a* and *b* are specified, these represent the channel values of the returned color; an *opacity* may also be specified. If a CSS Color Module Level 3 *specifier* string is specified, it is parsed and then converted to the CIELAB color space. See [color](#color) for examples. If a [*color*](#color) instance is specified, it is converted to the RGB color space using [*color*.rgb](#color_rgb) and then converted to CIELAB. (Colors already in the CIELAB color space skip the conversion to RGB, and colors in the HCL color space are converted directly to CIELAB.)
<a name="gray" href="#gray">#</a> d3.<b>gray</b>(<i>l</i>[, <i>opacity</i>]) [<>](https://github.com/d3/d3-color/blob/master/src/lab.js "Source")<br>
Constructs a new [CIELAB](#lab) color with the specified *l* value and *a* = *b* = 0.
<a name="hcl" href="#hcl">#</a> d3.<b>hcl</b>(<i>h</i>, <i>c</i>, <i>l</i>[, <i>opacity</i>]) [<>](https://github.com/d3/d3-color/blob/master/src/lab.js "Source")<br>
<a href="#hcl">#</a> d3.<b>hcl</b>(<i>specifier</i>)<br>
<a href="#hcl">#</a> d3.<b>hcl</b>(<i>color</i>)<br>
Equivalent to [d3.lch](#lch), but with reversed argument order.
<a name="lch" href="#lch">#</a> d3.<b>lch</b>(<i>l</i>, <i>c</i>, <i>h</i>[, <i>opacity</i>]) [<>](https://github.com/d3/d3-color/blob/master/src/lab.js "Source")<br>
<a href="#lch">#</a> d3.<b>lch</b>(<i>specifier</i>)<br>
<a href="#lch">#</a> d3.<b>lch</b>(<i>color</i>)<br>
Constructs a new [CIELCh<sub>ab</sub>](https://en.wikipedia.org/wiki/CIELAB_color_space#Cylindrical_representation:_CIELCh_or_CIEHLC) color. The channel values are exposed as `l`, `c` and `h` properties on the returned instance. Use the [CIELCh<sub>ab</sub> color picker](http://bl.ocks.org/mbostock/3e115519a1b495e0bd95) to explore this color space. The value of *l* is typically in the range [0, 100], *c* is typically in [0, 230], and *h* is typically in [0, 360).
If *l*, *c*, and *h* are specified, these represent the channel values of the returned color; an *opacity* may also be specified. If a CSS Color Module Level 3 *specifier* string is specified, it is parsed and then converted to CIELCh<sub>ab</sub> color space. See [color](#color) for examples. If a [*color*](#color) instance is specified, it is converted to the RGB color space using [*color*.rgb](#color_rgb) and then converted to CIELCh<sub>ab</sub>. (Colors already in CIELCh<sub>ab</sub> color space skip the conversion to RGB, and colors in CIELAB color space are converted directly to CIELCh<sub>ab</sub>.)
<a name="cubehelix" href="#cubehelix">#</a> d3.<b>cubehelix</b>(<i>h</i>, <i>s</i>, <i>l</i>[, <i>opacity</i>]) [<>](https://github.com/d3/d3-color/blob/master/src/cubehelix.js "Source")<br>
<a href="#cubehelix">#</a> d3.<b>cubehelix</b>(<i>specifier</i>)<br>
<a href="#cubehelix">#</a> d3.<b>cubehelix</b>(<i>color</i>)<br>
Constructs a new [Cubehelix](http://www.mrao.cam.ac.uk/~dag/CUBEHELIX/) color. The channel values are exposed as `h`, `s` and `l` properties on the returned instance. Use the [Cubehelix color picker](http://bl.ocks.org/mbostock/ba8d75e45794c27168b5) to explore this color space.
If *h*, *s* and *l* are specified, these represent the channel values of the returned color; an *opacity* may also be specified. If a CSS Color Module Level 3 *specifier* string is specified, it is parsed and then converted to the Cubehelix color space. See [color](#color) for examples. If a [*color*](#color) instance is specified, it is converted to the RGB color space using [*color*.rgb](#color_rgb) and then converted to Cubehelix. (Colors already in the Cubehelix color space skip the conversion to RGB.)

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// https://d3js.org/d3-color/ v2.0.0 Copyright 2020 Mike Bostock
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
typeof define === 'function' && define.amd ? define(['exports'], factory) :
(global = global || self, factory(global.d3 = global.d3 || {}));
}(this, function (exports) { 'use strict';
function define(constructor, factory, prototype) {
constructor.prototype = factory.prototype = prototype;
prototype.constructor = constructor;
}
function extend(parent, definition) {
var prototype = Object.create(parent.prototype);
for (var key in definition) prototype[key] = definition[key];
return prototype;
}
function Color() {}
var darker = 0.7;
var brighter = 1 / darker;
var reI = "\\s*([+-]?\\d+)\\s*",
reN = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)\\s*",
reP = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)%\\s*",
reHex = /^#([0-9a-f]{3,8})$/,
reRgbInteger = new RegExp("^rgb\\(" + [reI, reI, reI] + "\\)$"),
reRgbPercent = new RegExp("^rgb\\(" + [reP, reP, reP] + "\\)$"),
reRgbaInteger = new RegExp("^rgba\\(" + [reI, reI, reI, reN] + "\\)$"),
reRgbaPercent = new RegExp("^rgba\\(" + [reP, reP, reP, reN] + "\\)$"),
reHslPercent = new RegExp("^hsl\\(" + [reN, reP, reP] + "\\)$"),
reHslaPercent = new RegExp("^hsla\\(" + [reN, reP, reP, reN] + "\\)$");
var named = {
aliceblue: 0xf0f8ff,
antiquewhite: 0xfaebd7,
aqua: 0x00ffff,
aquamarine: 0x7fffd4,
azure: 0xf0ffff,
beige: 0xf5f5dc,
bisque: 0xffe4c4,
black: 0x000000,
blanchedalmond: 0xffebcd,
blue: 0x0000ff,
blueviolet: 0x8a2be2,
brown: 0xa52a2a,
burlywood: 0xdeb887,
cadetblue: 0x5f9ea0,
chartreuse: 0x7fff00,
chocolate: 0xd2691e,
coral: 0xff7f50,
cornflowerblue: 0x6495ed,
cornsilk: 0xfff8dc,
crimson: 0xdc143c,
cyan: 0x00ffff,
darkblue: 0x00008b,
darkcyan: 0x008b8b,
darkgoldenrod: 0xb8860b,
darkgray: 0xa9a9a9,
darkgreen: 0x006400,
darkgrey: 0xa9a9a9,
darkkhaki: 0xbdb76b,
darkmagenta: 0x8b008b,
darkolivegreen: 0x556b2f,
darkorange: 0xff8c00,
darkorchid: 0x9932cc,
darkred: 0x8b0000,
darksalmon: 0xe9967a,
darkseagreen: 0x8fbc8f,
darkslateblue: 0x483d8b,
darkslategray: 0x2f4f4f,
darkslategrey: 0x2f4f4f,
darkturquoise: 0x00ced1,
darkviolet: 0x9400d3,
deeppink: 0xff1493,
deepskyblue: 0x00bfff,
dimgray: 0x696969,
dimgrey: 0x696969,
dodgerblue: 0x1e90ff,
firebrick: 0xb22222,
floralwhite: 0xfffaf0,
forestgreen: 0x228b22,
fuchsia: 0xff00ff,
gainsboro: 0xdcdcdc,
ghostwhite: 0xf8f8ff,
gold: 0xffd700,
goldenrod: 0xdaa520,
gray: 0x808080,
green: 0x008000,
greenyellow: 0xadff2f,
grey: 0x808080,
honeydew: 0xf0fff0,
hotpink: 0xff69b4,
indianred: 0xcd5c5c,
indigo: 0x4b0082,
ivory: 0xfffff0,
khaki: 0xf0e68c,
lavender: 0xe6e6fa,
lavenderblush: 0xfff0f5,
lawngreen: 0x7cfc00,
lemonchiffon: 0xfffacd,
lightblue: 0xadd8e6,
lightcoral: 0xf08080,
lightcyan: 0xe0ffff,
lightgoldenrodyellow: 0xfafad2,
lightgray: 0xd3d3d3,
lightgreen: 0x90ee90,
lightgrey: 0xd3d3d3,
lightpink: 0xffb6c1,
lightsalmon: 0xffa07a,
lightseagreen: 0x20b2aa,
lightskyblue: 0x87cefa,
lightslategray: 0x778899,
lightslategrey: 0x778899,
lightsteelblue: 0xb0c4de,
lightyellow: 0xffffe0,
lime: 0x00ff00,
limegreen: 0x32cd32,
linen: 0xfaf0e6,
magenta: 0xff00ff,
maroon: 0x800000,
mediumaquamarine: 0x66cdaa,
mediumblue: 0x0000cd,
mediumorchid: 0xba55d3,
mediumpurple: 0x9370db,
mediumseagreen: 0x3cb371,
mediumslateblue: 0x7b68ee,
mediumspringgreen: 0x00fa9a,
mediumturquoise: 0x48d1cc,
mediumvioletred: 0xc71585,
midnightblue: 0x191970,
mintcream: 0xf5fffa,
mistyrose: 0xffe4e1,
moccasin: 0xffe4b5,
navajowhite: 0xffdead,
navy: 0x000080,
oldlace: 0xfdf5e6,
olive: 0x808000,
olivedrab: 0x6b8e23,
orange: 0xffa500,
orangered: 0xff4500,
orchid: 0xda70d6,
palegoldenrod: 0xeee8aa,
palegreen: 0x98fb98,
paleturquoise: 0xafeeee,
palevioletred: 0xdb7093,
papayawhip: 0xffefd5,
peachpuff: 0xffdab9,
peru: 0xcd853f,
pink: 0xffc0cb,
plum: 0xdda0dd,
powderblue: 0xb0e0e6,
purple: 0x800080,
rebeccapurple: 0x663399,
red: 0xff0000,
rosybrown: 0xbc8f8f,
royalblue: 0x4169e1,
saddlebrown: 0x8b4513,
salmon: 0xfa8072,
sandybrown: 0xf4a460,
seagreen: 0x2e8b57,
seashell: 0xfff5ee,
sienna: 0xa0522d,
silver: 0xc0c0c0,
skyblue: 0x87ceeb,
slateblue: 0x6a5acd,
slategray: 0x708090,
slategrey: 0x708090,
snow: 0xfffafa,
springgreen: 0x00ff7f,
steelblue: 0x4682b4,
tan: 0xd2b48c,
teal: 0x008080,
thistle: 0xd8bfd8,
tomato: 0xff6347,
turquoise: 0x40e0d0,
violet: 0xee82ee,
wheat: 0xf5deb3,
white: 0xffffff,
whitesmoke: 0xf5f5f5,
yellow: 0xffff00,
yellowgreen: 0x9acd32
};
define(Color, color, {
copy: function(channels) {
return Object.assign(new this.constructor, this, channels);
},
displayable: function() {
return this.rgb().displayable();
},
hex: color_formatHex, // Deprecated! Use color.formatHex.
formatHex: color_formatHex,
formatHsl: color_formatHsl,
formatRgb: color_formatRgb,
toString: color_formatRgb
});
function color_formatHex() {
return this.rgb().formatHex();
}
function color_formatHsl() {
return hslConvert(this).formatHsl();
}
function color_formatRgb() {
return this.rgb().formatRgb();
}
function color(format) {
var m, l;
format = (format + "").trim().toLowerCase();
return (m = reHex.exec(format)) ? (l = m[1].length, m = parseInt(m[1], 16), l === 6 ? rgbn(m) // #ff0000
: l === 3 ? new Rgb((m >> 8 & 0xf) | (m >> 4 & 0xf0), (m >> 4 & 0xf) | (m & 0xf0), ((m & 0xf) << 4) | (m & 0xf), 1) // #f00
: l === 8 ? rgba(m >> 24 & 0xff, m >> 16 & 0xff, m >> 8 & 0xff, (m & 0xff) / 0xff) // #ff000000
: l === 4 ? rgba((m >> 12 & 0xf) | (m >> 8 & 0xf0), (m >> 8 & 0xf) | (m >> 4 & 0xf0), (m >> 4 & 0xf) | (m & 0xf0), (((m & 0xf) << 4) | (m & 0xf)) / 0xff) // #f000
: null) // invalid hex
: (m = reRgbInteger.exec(format)) ? new Rgb(m[1], m[2], m[3], 1) // rgb(255, 0, 0)
: (m = reRgbPercent.exec(format)) ? new Rgb(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, 1) // rgb(100%, 0%, 0%)
: (m = reRgbaInteger.exec(format)) ? rgba(m[1], m[2], m[3], m[4]) // rgba(255, 0, 0, 1)
: (m = reRgbaPercent.exec(format)) ? rgba(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, m[4]) // rgb(100%, 0%, 0%, 1)
: (m = reHslPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, 1) // hsl(120, 50%, 50%)
: (m = reHslaPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, m[4]) // hsla(120, 50%, 50%, 1)
: named.hasOwnProperty(format) ? rgbn(named[format]) // eslint-disable-line no-prototype-builtins
: format === "transparent" ? new Rgb(NaN, NaN, NaN, 0)
: null;
}
function rgbn(n) {
return new Rgb(n >> 16 & 0xff, n >> 8 & 0xff, n & 0xff, 1);
}
function rgba(r, g, b, a) {
if (a <= 0) r = g = b = NaN;
return new Rgb(r, g, b, a);
}
function rgbConvert(o) {
if (!(o instanceof Color)) o = color(o);
if (!o) return new Rgb;
o = o.rgb();
return new Rgb(o.r, o.g, o.b, o.opacity);
}
function rgb(r, g, b, opacity) {
return arguments.length === 1 ? rgbConvert(r) : new Rgb(r, g, b, opacity == null ? 1 : opacity);
}
function Rgb(r, g, b, opacity) {
this.r = +r;
this.g = +g;
this.b = +b;
this.opacity = +opacity;
}
define(Rgb, rgb, extend(Color, {
brighter: function(k) {
k = k == null ? brighter : Math.pow(brighter, k);
return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
},
darker: function(k) {
k = k == null ? darker : Math.pow(darker, k);
return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
},
rgb: function() {
return this;
},
displayable: function() {
return (-0.5 <= this.r && this.r < 255.5)
&& (-0.5 <= this.g && this.g < 255.5)
&& (-0.5 <= this.b && this.b < 255.5)
&& (0 <= this.opacity && this.opacity <= 1);
},
hex: rgb_formatHex, // Deprecated! Use color.formatHex.
formatHex: rgb_formatHex,
formatRgb: rgb_formatRgb,
toString: rgb_formatRgb
}));
function rgb_formatHex() {
return "#" + hex(this.r) + hex(this.g) + hex(this.b);
}
function rgb_formatRgb() {
var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
return (a === 1 ? "rgb(" : "rgba(")
+ Math.max(0, Math.min(255, Math.round(this.r) || 0)) + ", "
+ Math.max(0, Math.min(255, Math.round(this.g) || 0)) + ", "
+ Math.max(0, Math.min(255, Math.round(this.b) || 0))
+ (a === 1 ? ")" : ", " + a + ")");
}
function hex(value) {
value = Math.max(0, Math.min(255, Math.round(value) || 0));
return (value < 16 ? "0" : "") + value.toString(16);
}
function hsla(h, s, l, a) {
if (a <= 0) h = s = l = NaN;
else if (l <= 0 || l >= 1) h = s = NaN;
else if (s <= 0) h = NaN;
return new Hsl(h, s, l, a);
}
function hslConvert(o) {
if (o instanceof Hsl) return new Hsl(o.h, o.s, o.l, o.opacity);
if (!(o instanceof Color)) o = color(o);
if (!o) return new Hsl;
if (o instanceof Hsl) return o;
o = o.rgb();
var r = o.r / 255,
g = o.g / 255,
b = o.b / 255,
min = Math.min(r, g, b),
max = Math.max(r, g, b),
h = NaN,
s = max - min,
l = (max + min) / 2;
if (s) {
if (r === max) h = (g - b) / s + (g < b) * 6;
else if (g === max) h = (b - r) / s + 2;
else h = (r - g) / s + 4;
s /= l < 0.5 ? max + min : 2 - max - min;
h *= 60;
} else {
s = l > 0 && l < 1 ? 0 : h;
}
return new Hsl(h, s, l, o.opacity);
}
function hsl(h, s, l, opacity) {
return arguments.length === 1 ? hslConvert(h) : new Hsl(h, s, l, opacity == null ? 1 : opacity);
}
function Hsl(h, s, l, opacity) {
this.h = +h;
this.s = +s;
this.l = +l;
this.opacity = +opacity;
}
define(Hsl, hsl, extend(Color, {
brighter: function(k) {
k = k == null ? brighter : Math.pow(brighter, k);
return new Hsl(this.h, this.s, this.l * k, this.opacity);
},
darker: function(k) {
k = k == null ? darker : Math.pow(darker, k);
return new Hsl(this.h, this.s, this.l * k, this.opacity);
},
rgb: function() {
var h = this.h % 360 + (this.h < 0) * 360,
s = isNaN(h) || isNaN(this.s) ? 0 : this.s,
l = this.l,
m2 = l + (l < 0.5 ? l : 1 - l) * s,
m1 = 2 * l - m2;
return new Rgb(
hsl2rgb(h >= 240 ? h - 240 : h + 120, m1, m2),
hsl2rgb(h, m1, m2),
hsl2rgb(h < 120 ? h + 240 : h - 120, m1, m2),
this.opacity
);
},
displayable: function() {
return (0 <= this.s && this.s <= 1 || isNaN(this.s))
&& (0 <= this.l && this.l <= 1)
&& (0 <= this.opacity && this.opacity <= 1);
},
formatHsl: function() {
var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
return (a === 1 ? "hsl(" : "hsla(")
+ (this.h || 0) + ", "
+ (this.s || 0) * 100 + "%, "
+ (this.l || 0) * 100 + "%"
+ (a === 1 ? ")" : ", " + a + ")");
}
}));
/* From FvD 13.37, CSS Color Module Level 3 */
function hsl2rgb(h, m1, m2) {
return (h < 60 ? m1 + (m2 - m1) * h / 60
: h < 180 ? m2
: h < 240 ? m1 + (m2 - m1) * (240 - h) / 60
: m1) * 255;
}
const radians = Math.PI / 180;
const degrees = 180 / Math.PI;
// https://observablehq.com/@mbostock/lab-and-rgb
const K = 18,
Xn = 0.96422,
Yn = 1,
Zn = 0.82521,
t0 = 4 / 29,
t1 = 6 / 29,
t2 = 3 * t1 * t1,
t3 = t1 * t1 * t1;
function labConvert(o) {
if (o instanceof Lab) return new Lab(o.l, o.a, o.b, o.opacity);
if (o instanceof Hcl) return hcl2lab(o);
if (!(o instanceof Rgb)) o = rgbConvert(o);
var r = rgb2lrgb(o.r),
g = rgb2lrgb(o.g),
b = rgb2lrgb(o.b),
y = xyz2lab((0.2225045 * r + 0.7168786 * g + 0.0606169 * b) / Yn), x, z;
if (r === g && g === b) x = z = y; else {
x = xyz2lab((0.4360747 * r + 0.3850649 * g + 0.1430804 * b) / Xn);
z = xyz2lab((0.0139322 * r + 0.0971045 * g + 0.7141733 * b) / Zn);
}
return new Lab(116 * y - 16, 500 * (x - y), 200 * (y - z), o.opacity);
}
function gray(l, opacity) {
return new Lab(l, 0, 0, opacity == null ? 1 : opacity);
}
function lab(l, a, b, opacity) {
return arguments.length === 1 ? labConvert(l) : new Lab(l, a, b, opacity == null ? 1 : opacity);
}
function Lab(l, a, b, opacity) {
this.l = +l;
this.a = +a;
this.b = +b;
this.opacity = +opacity;
}
define(Lab, lab, extend(Color, {
brighter: function(k) {
return new Lab(this.l + K * (k == null ? 1 : k), this.a, this.b, this.opacity);
},
darker: function(k) {
return new Lab(this.l - K * (k == null ? 1 : k), this.a, this.b, this.opacity);
},
rgb: function() {
var y = (this.l + 16) / 116,
x = isNaN(this.a) ? y : y + this.a / 500,
z = isNaN(this.b) ? y : y - this.b / 200;
x = Xn * lab2xyz(x);
y = Yn * lab2xyz(y);
z = Zn * lab2xyz(z);
return new Rgb(
lrgb2rgb( 3.1338561 * x - 1.6168667 * y - 0.4906146 * z),
lrgb2rgb(-0.9787684 * x + 1.9161415 * y + 0.0334540 * z),
lrgb2rgb( 0.0719453 * x - 0.2289914 * y + 1.4052427 * z),
this.opacity
);
}
}));
function xyz2lab(t) {
return t > t3 ? Math.pow(t, 1 / 3) : t / t2 + t0;
}
function lab2xyz(t) {
return t > t1 ? t * t * t : t2 * (t - t0);
}
function lrgb2rgb(x) {
return 255 * (x <= 0.0031308 ? 12.92 * x : 1.055 * Math.pow(x, 1 / 2.4) - 0.055);
}
function rgb2lrgb(x) {
return (x /= 255) <= 0.04045 ? x / 12.92 : Math.pow((x + 0.055) / 1.055, 2.4);
}
function hclConvert(o) {
if (o instanceof Hcl) return new Hcl(o.h, o.c, o.l, o.opacity);
if (!(o instanceof Lab)) o = labConvert(o);
if (o.a === 0 && o.b === 0) return new Hcl(NaN, 0 < o.l && o.l < 100 ? 0 : NaN, o.l, o.opacity);
var h = Math.atan2(o.b, o.a) * degrees;
return new Hcl(h < 0 ? h + 360 : h, Math.sqrt(o.a * o.a + o.b * o.b), o.l, o.opacity);
}
function lch(l, c, h, opacity) {
return arguments.length === 1 ? hclConvert(l) : new Hcl(h, c, l, opacity == null ? 1 : opacity);
}
function hcl(h, c, l, opacity) {
return arguments.length === 1 ? hclConvert(h) : new Hcl(h, c, l, opacity == null ? 1 : opacity);
}
function Hcl(h, c, l, opacity) {
this.h = +h;
this.c = +c;
this.l = +l;
this.opacity = +opacity;
}
function hcl2lab(o) {
if (isNaN(o.h)) return new Lab(o.l, 0, 0, o.opacity);
var h = o.h * radians;
return new Lab(o.l, Math.cos(h) * o.c, Math.sin(h) * o.c, o.opacity);
}
define(Hcl, hcl, extend(Color, {
brighter: function(k) {
return new Hcl(this.h, this.c, this.l + K * (k == null ? 1 : k), this.opacity);
},
darker: function(k) {
return new Hcl(this.h, this.c, this.l - K * (k == null ? 1 : k), this.opacity);
},
rgb: function() {
return hcl2lab(this).rgb();
}
}));
var A = -0.14861,
B = +1.78277,
C = -0.29227,
D = -0.90649,
E = +1.97294,
ED = E * D,
EB = E * B,
BC_DA = B * C - D * A;
function cubehelixConvert(o) {
if (o instanceof Cubehelix) return new Cubehelix(o.h, o.s, o.l, o.opacity);
if (!(o instanceof Rgb)) o = rgbConvert(o);
var r = o.r / 255,
g = o.g / 255,
b = o.b / 255,
l = (BC_DA * b + ED * r - EB * g) / (BC_DA + ED - EB),
bl = b - l,
k = (E * (g - l) - C * bl) / D,
s = Math.sqrt(k * k + bl * bl) / (E * l * (1 - l)), // NaN if l=0 or l=1
h = s ? Math.atan2(k, bl) * degrees - 120 : NaN;
return new Cubehelix(h < 0 ? h + 360 : h, s, l, o.opacity);
}
function cubehelix(h, s, l, opacity) {
return arguments.length === 1 ? cubehelixConvert(h) : new Cubehelix(h, s, l, opacity == null ? 1 : opacity);
}
function Cubehelix(h, s, l, opacity) {
this.h = +h;
this.s = +s;
this.l = +l;
this.opacity = +opacity;
}
define(Cubehelix, cubehelix, extend(Color, {
brighter: function(k) {
k = k == null ? brighter : Math.pow(brighter, k);
return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
},
darker: function(k) {
k = k == null ? darker : Math.pow(darker, k);
return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
},
rgb: function() {
var h = isNaN(this.h) ? 0 : (this.h + 120) * radians,
l = +this.l,
a = isNaN(this.s) ? 0 : this.s * l * (1 - l),
cosh = Math.cos(h),
sinh = Math.sin(h);
return new Rgb(
255 * (l + a * (A * cosh + B * sinh)),
255 * (l + a * (C * cosh + D * sinh)),
255 * (l + a * (E * cosh)),
this.opacity
);
}
}));
exports.color = color;
exports.cubehelix = cubehelix;
exports.gray = gray;
exports.hcl = hcl;
exports.hsl = hsl;
exports.lab = lab;
exports.lch = lch;
exports.rgb = rgb;
Object.defineProperty(exports, '__esModule', { value: true });
}));

2
frontend/node_modules/d3-zoom/node_modules/d3-color/dist/d3-color.min.js generated vendored Normal file
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frontend/node_modules/d3-zoom/node_modules/d3-color/package.json generated vendored Normal file
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{
"name": "d3-color",
"version": "2.0.0",
"description": "Color spaces! RGB, HSL, Cubehelix, Lab and HCL (Lch).",
"keywords": [
"d3",
"d3-module",
"color",
"rgb",
"hsl",
"lab",
"hcl",
"lch",
"cubehelix"
],
"homepage": "https://d3js.org/d3-color/",
"license": "BSD-3-Clause",
"author": {
"name": "Mike Bostock",
"url": "http://bost.ocks.org/mike"
},
"main": "dist/d3-color.js",
"unpkg": "dist/d3-color.min.js",
"jsdelivr": "dist/d3-color.min.js",
"module": "src/index.js",
"repository": {
"type": "git",
"url": "https://github.com/d3/d3-color.git"
},
"files": [
"dist/**/*.js",
"src/**/*.js"
],
"scripts": {
"pretest": "rollup -c",
"test": "tape 'test/**/*-test.js' && eslint src test",
"prepublishOnly": "rm -rf dist && yarn test",
"postpublish": "git push && git push --tags && cd ../d3.github.com && git pull && cp ../${npm_package_name}/dist/${npm_package_name}.js ${npm_package_name}.v${npm_package_version%%.*}.js && cp ../${npm_package_name}/dist/${npm_package_name}.min.js ${npm_package_name}.v${npm_package_version%%.*}.min.js && git add ${npm_package_name}.v${npm_package_version%%.*}.js ${npm_package_name}.v${npm_package_version%%.*}.min.js && git commit -m \"${npm_package_name} ${npm_package_version}\" && git push && cd - && zip -j dist/${npm_package_name}.zip -- LICENSE README.md dist/${npm_package_name}.js dist/${npm_package_name}.min.js"
},
"sideEffects": false,
"devDependencies": {
"eslint": "6",
"rollup": "1",
"rollup-plugin-terser": "5",
"tape": "4"
}
}

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import define, {extend} from "./define.js";
export function Color() {}
export var darker = 0.7;
export var brighter = 1 / darker;
var reI = "\\s*([+-]?\\d+)\\s*",
reN = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)\\s*",
reP = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)%\\s*",
reHex = /^#([0-9a-f]{3,8})$/,
reRgbInteger = new RegExp("^rgb\\(" + [reI, reI, reI] + "\\)$"),
reRgbPercent = new RegExp("^rgb\\(" + [reP, reP, reP] + "\\)$"),
reRgbaInteger = new RegExp("^rgba\\(" + [reI, reI, reI, reN] + "\\)$"),
reRgbaPercent = new RegExp("^rgba\\(" + [reP, reP, reP, reN] + "\\)$"),
reHslPercent = new RegExp("^hsl\\(" + [reN, reP, reP] + "\\)$"),
reHslaPercent = new RegExp("^hsla\\(" + [reN, reP, reP, reN] + "\\)$");
var named = {
aliceblue: 0xf0f8ff,
antiquewhite: 0xfaebd7,
aqua: 0x00ffff,
aquamarine: 0x7fffd4,
azure: 0xf0ffff,
beige: 0xf5f5dc,
bisque: 0xffe4c4,
black: 0x000000,
blanchedalmond: 0xffebcd,
blue: 0x0000ff,
blueviolet: 0x8a2be2,
brown: 0xa52a2a,
burlywood: 0xdeb887,
cadetblue: 0x5f9ea0,
chartreuse: 0x7fff00,
chocolate: 0xd2691e,
coral: 0xff7f50,
cornflowerblue: 0x6495ed,
cornsilk: 0xfff8dc,
crimson: 0xdc143c,
cyan: 0x00ffff,
darkblue: 0x00008b,
darkcyan: 0x008b8b,
darkgoldenrod: 0xb8860b,
darkgray: 0xa9a9a9,
darkgreen: 0x006400,
darkgrey: 0xa9a9a9,
darkkhaki: 0xbdb76b,
darkmagenta: 0x8b008b,
darkolivegreen: 0x556b2f,
darkorange: 0xff8c00,
darkorchid: 0x9932cc,
darkred: 0x8b0000,
darksalmon: 0xe9967a,
darkseagreen: 0x8fbc8f,
darkslateblue: 0x483d8b,
darkslategray: 0x2f4f4f,
darkslategrey: 0x2f4f4f,
darkturquoise: 0x00ced1,
darkviolet: 0x9400d3,
deeppink: 0xff1493,
deepskyblue: 0x00bfff,
dimgray: 0x696969,
dimgrey: 0x696969,
dodgerblue: 0x1e90ff,
firebrick: 0xb22222,
floralwhite: 0xfffaf0,
forestgreen: 0x228b22,
fuchsia: 0xff00ff,
gainsboro: 0xdcdcdc,
ghostwhite: 0xf8f8ff,
gold: 0xffd700,
goldenrod: 0xdaa520,
gray: 0x808080,
green: 0x008000,
greenyellow: 0xadff2f,
grey: 0x808080,
honeydew: 0xf0fff0,
hotpink: 0xff69b4,
indianred: 0xcd5c5c,
indigo: 0x4b0082,
ivory: 0xfffff0,
khaki: 0xf0e68c,
lavender: 0xe6e6fa,
lavenderblush: 0xfff0f5,
lawngreen: 0x7cfc00,
lemonchiffon: 0xfffacd,
lightblue: 0xadd8e6,
lightcoral: 0xf08080,
lightcyan: 0xe0ffff,
lightgoldenrodyellow: 0xfafad2,
lightgray: 0xd3d3d3,
lightgreen: 0x90ee90,
lightgrey: 0xd3d3d3,
lightpink: 0xffb6c1,
lightsalmon: 0xffa07a,
lightseagreen: 0x20b2aa,
lightskyblue: 0x87cefa,
lightslategray: 0x778899,
lightslategrey: 0x778899,
lightsteelblue: 0xb0c4de,
lightyellow: 0xffffe0,
lime: 0x00ff00,
limegreen: 0x32cd32,
linen: 0xfaf0e6,
magenta: 0xff00ff,
maroon: 0x800000,
mediumaquamarine: 0x66cdaa,
mediumblue: 0x0000cd,
mediumorchid: 0xba55d3,
mediumpurple: 0x9370db,
mediumseagreen: 0x3cb371,
mediumslateblue: 0x7b68ee,
mediumspringgreen: 0x00fa9a,
mediumturquoise: 0x48d1cc,
mediumvioletred: 0xc71585,
midnightblue: 0x191970,
mintcream: 0xf5fffa,
mistyrose: 0xffe4e1,
moccasin: 0xffe4b5,
navajowhite: 0xffdead,
navy: 0x000080,
oldlace: 0xfdf5e6,
olive: 0x808000,
olivedrab: 0x6b8e23,
orange: 0xffa500,
orangered: 0xff4500,
orchid: 0xda70d6,
palegoldenrod: 0xeee8aa,
palegreen: 0x98fb98,
paleturquoise: 0xafeeee,
palevioletred: 0xdb7093,
papayawhip: 0xffefd5,
peachpuff: 0xffdab9,
peru: 0xcd853f,
pink: 0xffc0cb,
plum: 0xdda0dd,
powderblue: 0xb0e0e6,
purple: 0x800080,
rebeccapurple: 0x663399,
red: 0xff0000,
rosybrown: 0xbc8f8f,
royalblue: 0x4169e1,
saddlebrown: 0x8b4513,
salmon: 0xfa8072,
sandybrown: 0xf4a460,
seagreen: 0x2e8b57,
seashell: 0xfff5ee,
sienna: 0xa0522d,
silver: 0xc0c0c0,
skyblue: 0x87ceeb,
slateblue: 0x6a5acd,
slategray: 0x708090,
slategrey: 0x708090,
snow: 0xfffafa,
springgreen: 0x00ff7f,
steelblue: 0x4682b4,
tan: 0xd2b48c,
teal: 0x008080,
thistle: 0xd8bfd8,
tomato: 0xff6347,
turquoise: 0x40e0d0,
violet: 0xee82ee,
wheat: 0xf5deb3,
white: 0xffffff,
whitesmoke: 0xf5f5f5,
yellow: 0xffff00,
yellowgreen: 0x9acd32
};
define(Color, color, {
copy: function(channels) {
return Object.assign(new this.constructor, this, channels);
},
displayable: function() {
return this.rgb().displayable();
},
hex: color_formatHex, // Deprecated! Use color.formatHex.
formatHex: color_formatHex,
formatHsl: color_formatHsl,
formatRgb: color_formatRgb,
toString: color_formatRgb
});
function color_formatHex() {
return this.rgb().formatHex();
}
function color_formatHsl() {
return hslConvert(this).formatHsl();
}
function color_formatRgb() {
return this.rgb().formatRgb();
}
export default function color(format) {
var m, l;
format = (format + "").trim().toLowerCase();
return (m = reHex.exec(format)) ? (l = m[1].length, m = parseInt(m[1], 16), l === 6 ? rgbn(m) // #ff0000
: l === 3 ? new Rgb((m >> 8 & 0xf) | (m >> 4 & 0xf0), (m >> 4 & 0xf) | (m & 0xf0), ((m & 0xf) << 4) | (m & 0xf), 1) // #f00
: l === 8 ? rgba(m >> 24 & 0xff, m >> 16 & 0xff, m >> 8 & 0xff, (m & 0xff) / 0xff) // #ff000000
: l === 4 ? rgba((m >> 12 & 0xf) | (m >> 8 & 0xf0), (m >> 8 & 0xf) | (m >> 4 & 0xf0), (m >> 4 & 0xf) | (m & 0xf0), (((m & 0xf) << 4) | (m & 0xf)) / 0xff) // #f000
: null) // invalid hex
: (m = reRgbInteger.exec(format)) ? new Rgb(m[1], m[2], m[3], 1) // rgb(255, 0, 0)
: (m = reRgbPercent.exec(format)) ? new Rgb(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, 1) // rgb(100%, 0%, 0%)
: (m = reRgbaInteger.exec(format)) ? rgba(m[1], m[2], m[3], m[4]) // rgba(255, 0, 0, 1)
: (m = reRgbaPercent.exec(format)) ? rgba(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, m[4]) // rgb(100%, 0%, 0%, 1)
: (m = reHslPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, 1) // hsl(120, 50%, 50%)
: (m = reHslaPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, m[4]) // hsla(120, 50%, 50%, 1)
: named.hasOwnProperty(format) ? rgbn(named[format]) // eslint-disable-line no-prototype-builtins
: format === "transparent" ? new Rgb(NaN, NaN, NaN, 0)
: null;
}
function rgbn(n) {
return new Rgb(n >> 16 & 0xff, n >> 8 & 0xff, n & 0xff, 1);
}
function rgba(r, g, b, a) {
if (a <= 0) r = g = b = NaN;
return new Rgb(r, g, b, a);
}
export function rgbConvert(o) {
if (!(o instanceof Color)) o = color(o);
if (!o) return new Rgb;
o = o.rgb();
return new Rgb(o.r, o.g, o.b, o.opacity);
}
export function rgb(r, g, b, opacity) {
return arguments.length === 1 ? rgbConvert(r) : new Rgb(r, g, b, opacity == null ? 1 : opacity);
}
export function Rgb(r, g, b, opacity) {
this.r = +r;
this.g = +g;
this.b = +b;
this.opacity = +opacity;
}
define(Rgb, rgb, extend(Color, {
brighter: function(k) {
k = k == null ? brighter : Math.pow(brighter, k);
return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
},
darker: function(k) {
k = k == null ? darker : Math.pow(darker, k);
return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
},
rgb: function() {
return this;
},
displayable: function() {
return (-0.5 <= this.r && this.r < 255.5)
&& (-0.5 <= this.g && this.g < 255.5)
&& (-0.5 <= this.b && this.b < 255.5)
&& (0 <= this.opacity && this.opacity <= 1);
},
hex: rgb_formatHex, // Deprecated! Use color.formatHex.
formatHex: rgb_formatHex,
formatRgb: rgb_formatRgb,
toString: rgb_formatRgb
}));
function rgb_formatHex() {
return "#" + hex(this.r) + hex(this.g) + hex(this.b);
}
function rgb_formatRgb() {
var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
return (a === 1 ? "rgb(" : "rgba(")
+ Math.max(0, Math.min(255, Math.round(this.r) || 0)) + ", "
+ Math.max(0, Math.min(255, Math.round(this.g) || 0)) + ", "
+ Math.max(0, Math.min(255, Math.round(this.b) || 0))
+ (a === 1 ? ")" : ", " + a + ")");
}
function hex(value) {
value = Math.max(0, Math.min(255, Math.round(value) || 0));
return (value < 16 ? "0" : "") + value.toString(16);
}
function hsla(h, s, l, a) {
if (a <= 0) h = s = l = NaN;
else if (l <= 0 || l >= 1) h = s = NaN;
else if (s <= 0) h = NaN;
return new Hsl(h, s, l, a);
}
export function hslConvert(o) {
if (o instanceof Hsl) return new Hsl(o.h, o.s, o.l, o.opacity);
if (!(o instanceof Color)) o = color(o);
if (!o) return new Hsl;
if (o instanceof Hsl) return o;
o = o.rgb();
var r = o.r / 255,
g = o.g / 255,
b = o.b / 255,
min = Math.min(r, g, b),
max = Math.max(r, g, b),
h = NaN,
s = max - min,
l = (max + min) / 2;
if (s) {
if (r === max) h = (g - b) / s + (g < b) * 6;
else if (g === max) h = (b - r) / s + 2;
else h = (r - g) / s + 4;
s /= l < 0.5 ? max + min : 2 - max - min;
h *= 60;
} else {
s = l > 0 && l < 1 ? 0 : h;
}
return new Hsl(h, s, l, o.opacity);
}
export function hsl(h, s, l, opacity) {
return arguments.length === 1 ? hslConvert(h) : new Hsl(h, s, l, opacity == null ? 1 : opacity);
}
function Hsl(h, s, l, opacity) {
this.h = +h;
this.s = +s;
this.l = +l;
this.opacity = +opacity;
}
define(Hsl, hsl, extend(Color, {
brighter: function(k) {
k = k == null ? brighter : Math.pow(brighter, k);
return new Hsl(this.h, this.s, this.l * k, this.opacity);
},
darker: function(k) {
k = k == null ? darker : Math.pow(darker, k);
return new Hsl(this.h, this.s, this.l * k, this.opacity);
},
rgb: function() {
var h = this.h % 360 + (this.h < 0) * 360,
s = isNaN(h) || isNaN(this.s) ? 0 : this.s,
l = this.l,
m2 = l + (l < 0.5 ? l : 1 - l) * s,
m1 = 2 * l - m2;
return new Rgb(
hsl2rgb(h >= 240 ? h - 240 : h + 120, m1, m2),
hsl2rgb(h, m1, m2),
hsl2rgb(h < 120 ? h + 240 : h - 120, m1, m2),
this.opacity
);
},
displayable: function() {
return (0 <= this.s && this.s <= 1 || isNaN(this.s))
&& (0 <= this.l && this.l <= 1)
&& (0 <= this.opacity && this.opacity <= 1);
},
formatHsl: function() {
var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
return (a === 1 ? "hsl(" : "hsla(")
+ (this.h || 0) + ", "
+ (this.s || 0) * 100 + "%, "
+ (this.l || 0) * 100 + "%"
+ (a === 1 ? ")" : ", " + a + ")");
}
}));
/* From FvD 13.37, CSS Color Module Level 3 */
function hsl2rgb(h, m1, m2) {
return (h < 60 ? m1 + (m2 - m1) * h / 60
: h < 180 ? m2
: h < 240 ? m1 + (m2 - m1) * (240 - h) / 60
: m1) * 255;
}

61
frontend/node_modules/d3-zoom/node_modules/d3-color/src/cubehelix.js generated vendored Normal file
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import define, {extend} from "./define.js";
import {Color, rgbConvert, Rgb, darker, brighter} from "./color.js";
import {degrees, radians} from "./math.js";
var A = -0.14861,
B = +1.78277,
C = -0.29227,
D = -0.90649,
E = +1.97294,
ED = E * D,
EB = E * B,
BC_DA = B * C - D * A;
function cubehelixConvert(o) {
if (o instanceof Cubehelix) return new Cubehelix(o.h, o.s, o.l, o.opacity);
if (!(o instanceof Rgb)) o = rgbConvert(o);
var r = o.r / 255,
g = o.g / 255,
b = o.b / 255,
l = (BC_DA * b + ED * r - EB * g) / (BC_DA + ED - EB),
bl = b - l,
k = (E * (g - l) - C * bl) / D,
s = Math.sqrt(k * k + bl * bl) / (E * l * (1 - l)), // NaN if l=0 or l=1
h = s ? Math.atan2(k, bl) * degrees - 120 : NaN;
return new Cubehelix(h < 0 ? h + 360 : h, s, l, o.opacity);
}
export default function cubehelix(h, s, l, opacity) {
return arguments.length === 1 ? cubehelixConvert(h) : new Cubehelix(h, s, l, opacity == null ? 1 : opacity);
}
export function Cubehelix(h, s, l, opacity) {
this.h = +h;
this.s = +s;
this.l = +l;
this.opacity = +opacity;
}
define(Cubehelix, cubehelix, extend(Color, {
brighter: function(k) {
k = k == null ? brighter : Math.pow(brighter, k);
return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
},
darker: function(k) {
k = k == null ? darker : Math.pow(darker, k);
return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
},
rgb: function() {
var h = isNaN(this.h) ? 0 : (this.h + 120) * radians,
l = +this.l,
a = isNaN(this.s) ? 0 : this.s * l * (1 - l),
cosh = Math.cos(h),
sinh = Math.sin(h);
return new Rgb(
255 * (l + a * (A * cosh + B * sinh)),
255 * (l + a * (C * cosh + D * sinh)),
255 * (l + a * (E * cosh)),
this.opacity
);
}
}));

10
frontend/node_modules/d3-zoom/node_modules/d3-color/src/define.js generated vendored Normal file
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export default function(constructor, factory, prototype) {
constructor.prototype = factory.prototype = prototype;
prototype.constructor = constructor;
}
export function extend(parent, definition) {
var prototype = Object.create(parent.prototype);
for (var key in definition) prototype[key] = definition[key];
return prototype;
}

3
frontend/node_modules/d3-zoom/node_modules/d3-color/src/index.js generated vendored Normal file
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export {default as color, rgb, hsl} from "./color.js";
export {default as lab, hcl, lch, gray} from "./lab.js";
export {default as cubehelix} from "./cubehelix.js";

123
frontend/node_modules/d3-zoom/node_modules/d3-color/src/lab.js generated vendored Normal file
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import define, {extend} from "./define.js";
import {Color, rgbConvert, Rgb} from "./color.js";
import {degrees, radians} from "./math.js";
// https://observablehq.com/@mbostock/lab-and-rgb
const K = 18,
Xn = 0.96422,
Yn = 1,
Zn = 0.82521,
t0 = 4 / 29,
t1 = 6 / 29,
t2 = 3 * t1 * t1,
t3 = t1 * t1 * t1;
function labConvert(o) {
if (o instanceof Lab) return new Lab(o.l, o.a, o.b, o.opacity);
if (o instanceof Hcl) return hcl2lab(o);
if (!(o instanceof Rgb)) o = rgbConvert(o);
var r = rgb2lrgb(o.r),
g = rgb2lrgb(o.g),
b = rgb2lrgb(o.b),
y = xyz2lab((0.2225045 * r + 0.7168786 * g + 0.0606169 * b) / Yn), x, z;
if (r === g && g === b) x = z = y; else {
x = xyz2lab((0.4360747 * r + 0.3850649 * g + 0.1430804 * b) / Xn);
z = xyz2lab((0.0139322 * r + 0.0971045 * g + 0.7141733 * b) / Zn);
}
return new Lab(116 * y - 16, 500 * (x - y), 200 * (y - z), o.opacity);
}
export function gray(l, opacity) {
return new Lab(l, 0, 0, opacity == null ? 1 : opacity);
}
export default function lab(l, a, b, opacity) {
return arguments.length === 1 ? labConvert(l) : new Lab(l, a, b, opacity == null ? 1 : opacity);
}
export function Lab(l, a, b, opacity) {
this.l = +l;
this.a = +a;
this.b = +b;
this.opacity = +opacity;
}
define(Lab, lab, extend(Color, {
brighter: function(k) {
return new Lab(this.l + K * (k == null ? 1 : k), this.a, this.b, this.opacity);
},
darker: function(k) {
return new Lab(this.l - K * (k == null ? 1 : k), this.a, this.b, this.opacity);
},
rgb: function() {
var y = (this.l + 16) / 116,
x = isNaN(this.a) ? y : y + this.a / 500,
z = isNaN(this.b) ? y : y - this.b / 200;
x = Xn * lab2xyz(x);
y = Yn * lab2xyz(y);
z = Zn * lab2xyz(z);
return new Rgb(
lrgb2rgb( 3.1338561 * x - 1.6168667 * y - 0.4906146 * z),
lrgb2rgb(-0.9787684 * x + 1.9161415 * y + 0.0334540 * z),
lrgb2rgb( 0.0719453 * x - 0.2289914 * y + 1.4052427 * z),
this.opacity
);
}
}));
function xyz2lab(t) {
return t > t3 ? Math.pow(t, 1 / 3) : t / t2 + t0;
}
function lab2xyz(t) {
return t > t1 ? t * t * t : t2 * (t - t0);
}
function lrgb2rgb(x) {
return 255 * (x <= 0.0031308 ? 12.92 * x : 1.055 * Math.pow(x, 1 / 2.4) - 0.055);
}
function rgb2lrgb(x) {
return (x /= 255) <= 0.04045 ? x / 12.92 : Math.pow((x + 0.055) / 1.055, 2.4);
}
function hclConvert(o) {
if (o instanceof Hcl) return new Hcl(o.h, o.c, o.l, o.opacity);
if (!(o instanceof Lab)) o = labConvert(o);
if (o.a === 0 && o.b === 0) return new Hcl(NaN, 0 < o.l && o.l < 100 ? 0 : NaN, o.l, o.opacity);
var h = Math.atan2(o.b, o.a) * degrees;
return new Hcl(h < 0 ? h + 360 : h, Math.sqrt(o.a * o.a + o.b * o.b), o.l, o.opacity);
}
export function lch(l, c, h, opacity) {
return arguments.length === 1 ? hclConvert(l) : new Hcl(h, c, l, opacity == null ? 1 : opacity);
}
export function hcl(h, c, l, opacity) {
return arguments.length === 1 ? hclConvert(h) : new Hcl(h, c, l, opacity == null ? 1 : opacity);
}
export function Hcl(h, c, l, opacity) {
this.h = +h;
this.c = +c;
this.l = +l;
this.opacity = +opacity;
}
function hcl2lab(o) {
if (isNaN(o.h)) return new Lab(o.l, 0, 0, o.opacity);
var h = o.h * radians;
return new Lab(o.l, Math.cos(h) * o.c, Math.sin(h) * o.c, o.opacity);
}
define(Hcl, hcl, extend(Color, {
brighter: function(k) {
return new Hcl(this.h, this.c, this.l + K * (k == null ? 1 : k), this.opacity);
},
darker: function(k) {
return new Hcl(this.h, this.c, this.l - K * (k == null ? 1 : k), this.opacity);
},
rgb: function() {
return hcl2lab(this).rgb();
}
}));

2
frontend/node_modules/d3-zoom/node_modules/d3-color/src/math.js generated vendored Normal file
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export const radians = Math.PI / 180;
export const degrees = 180 / Math.PI;

27
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/LICENSE generated vendored Normal file
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Copyright 2010-2016 Mike Bostock
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of the author nor the names of contributors may be used to
endorse or promote products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

258
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/README.md generated vendored Normal file
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# d3-interpolate
This module provides a variety of interpolation methods for blending between two values. Values may be numbers, colors, strings, arrays, or even deeply-nested objects. For example:
```js
var i = d3.interpolateNumber(10, 20);
i(0.0); // 10
i(0.2); // 12
i(0.5); // 15
i(1.0); // 20
```
The returned function `i` is called an *interpolator*. Given a starting value *a* and an ending value *b*, it takes a parameter *t* in the domain [0, 1] and returns the corresponding interpolated value between *a* and *b*. An interpolator typically returns a value equivalent to *a* at *t* = 0 and a value equivalent to *b* at *t* = 1.
You can interpolate more than just numbers. To find the perceptual midpoint between steelblue and brown:
```js
d3.interpolateLab("steelblue", "brown")(0.5); // "rgb(142, 92, 109)"
```
Here’s a more elaborate example demonstrating type inference used by [interpolate](#interpolate):
```js
var i = d3.interpolate({colors: ["red", "blue"]}, {colors: ["white", "black"]});
i(0.0); // {colors: ["rgb(255, 0, 0)", "rgb(0, 0, 255)"]}
i(0.5); // {colors: ["rgb(255, 128, 128)", "rgb(0, 0, 128)"]}
i(1.0); // {colors: ["rgb(255, 255, 255)", "rgb(0, 0, 0)"]}
```
Note that the generic value interpolator detects not only nested objects and arrays, but also color strings and numbers embedded in strings!
## Installing
If you use NPM, `npm install d3-interpolate`. Otherwise, download the [latest release](https://github.com/d3/d3-interpolate/releases/latest). You can also load directly from [d3js.org](https://d3js.org), either as a [standalone library](https://d3js.org/d3-interpolate.v2.min.js) or as part of [D3](https://github.com/d3/d3). AMD, CommonJS, and vanilla environments are supported.
In vanilla, a `d3` global is exported. (If using [color interpolation](#color-spaces), also load [d3-color](https://github.com/d3/d3-color).)
```html
<script src="https://d3js.org/d3-color.v2.min.js"></script>
<script src="https://d3js.org/d3-interpolate.v2.min.js"></script>
<script>
var interpolate = d3.interpolateRgb("steelblue", "brown");
</script>
```
## API Reference
<a name="interpolate" href="#interpolate">#</a> d3.<b>interpolate</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/value.js), [Examples](https://observablehq.com/@d3/d3-interpolate)
Returns an interpolator between the two arbitrary values *a* and *b*. The interpolator implementation is based on the type of the end value *b*, using the following algorithm:
1. If *b* is null, undefined or a boolean, use the constant *b*.
2. If *b* is a number, use [interpolateNumber](#interpolateNumber).
3. If *b* is a [color](https://github.com/d3/d3-color/blob/master/README.md#color) or a string coercible to a color, use [interpolateRgb](#interpolateRgb).
4. If *b* is a [date](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date), use [interpolateDate](#interpolateDate).
5. If *b* is a string, use [interpolateString](#interpolateString).
6. If *b* is a [typed array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray) of numbers, use [interpolateNumberArray](#interpolateNumberArray).
7. If *b* is a generic [array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray), use [interpolateArray](#interpolateArray).
8. If *b* is coercible to a number, use [interpolateNumber](#interpolateNumber).
9. Use [interpolateObject](#interpolateObject).
Based on the chosen interpolator, *a* is coerced to the suitable corresponding type.
<a name="interpolateNumber" href="#interpolateNumber">#</a> d3.<b>interpolateNumber</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/number.js), [Examples](https://observablehq.com/@d3/d3-interpolatenumber)
Returns an interpolator between the two numbers *a* and *b*. The returned interpolator is equivalent to:
```js
function interpolator(t) {
return a * (1 - t) + b * t;
}
```
Caution: avoid interpolating to or from the number zero when the interpolator is used to generate a string. When very small values are stringified, they may be converted to scientific notation, which is an invalid attribute or style property value in older browsers. For example, the number `0.0000001` is converted to the string `"1e-7"`. This is particularly noticeable with interpolating opacity. To avoid scientific notation, start or end the transition at 1e-6: the smallest value that is not stringified in scientific notation.
<a name="interpolateRound" href="#interpolateRound">#</a> d3.<b>interpolateRound</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/round.js), [Examples](https://observablehq.com/@d3/d3-interpolatenumber)
Returns an interpolator between the two numbers *a* and *b*; the interpolator is similar to [interpolateNumber](#interpolateNumber), except it will round the resulting value to the nearest integer.
<a name="interpolateString" href="#interpolateString">#</a> d3.<b>interpolateString</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/string.js), [Examples](https://observablehq.com/@d3/d3-interpolatestring)
Returns an interpolator between the two strings *a* and *b*. The string interpolator finds numbers embedded in *a* and *b*, where each number is of the form understood by JavaScript. A few examples of numbers that will be detected within a string: `-1`, `42`, `3.14159`, and `6.0221413e+23`.
For each number embedded in *b*, the interpolator will attempt to find a corresponding number in *a*. If a corresponding number is found, a numeric interpolator is created using [interpolateNumber](#interpolateNumber). The remaining parts of the string *b* are used as a template: the static parts of the string *b* remain constant for the interpolation, with the interpolated numeric values embedded in the template.
For example, if *a* is `"300 12px sans-serif"`, and *b* is `"500 36px Comic-Sans"`, two embedded numbers are found. The remaining static parts (of string *b*) are a space between the two numbers (`" "`), and the suffix (`"px Comic-Sans"`). The result of the interpolator at *t* = 0.5 is `"400 24px Comic-Sans"`.
<a name="interpolateDate" href="#interpolateDate">#</a> d3.<b>interpolateDate</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/date.js), [Examples](https://observablehq.com/@d3/d3-interpolatedate)
Returns an interpolator between the two [dates](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date) *a* and *b*.
Note: **no defensive copy** of the returned date is created; the same Date instance is returned for every evaluation of the interpolator. No copy is made for performance reasons; interpolators are often part of the inner loop of [animated transitions](https://github.com/d3/d3-transition).
<a name="interpolateArray" href="#interpolateArray">#</a> d3.<b>interpolateArray</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/array.js), [Examples](https://observablehq.com/@d3/d3-interpolateobject)
Returns an interpolator between the two arrays *a* and *b*. If *b* is a typed array (e.g., Float64Array), [interpolateNumberArray](#interpolateNumberArray) is called instead.
Internally, an array template is created that is the same length as *b*. For each element in *b*, if there exists a corresponding element in *a*, a generic interpolator is created for the two elements using [interpolate](#interpolate). If there is no such element, the static value from *b* is used in the template. Then, for the given parameter *t*, the template’s embedded interpolators are evaluated. The updated array template is then returned.
For example, if *a* is the array `[0, 1]` and *b* is the array `[1, 10, 100]`, then the result of the interpolator for *t* = 0.5 is the array `[0.5, 5.5, 100]`.
Note: **no defensive copy** of the template array is created; modifications of the returned array may adversely affect subsequent evaluation of the interpolator. No copy is made for performance reasons; interpolators are often part of the inner loop of [animated transitions](https://github.com/d3/d3-transition).
<a name="interpolateNumberArray" href="#interpolateNumberArray">#</a> d3.<b>interpolateNumberArray</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/numberArray.js), [Examples](https://observablehq.com/@d3/d3-interpolatenumberarray)
Returns an interpolator between the two arrays of numbers *a* and *b*. Internally, an array template is created that is the same type and length as *b*. For each element in *b*, if there exists a corresponding element in *a*, the values are directly interpolated in the array template. If there is no such element, the static value from *b* is copied. The updated array template is then returned.
Note: For performance reasons, **no defensive copy** is made of the template array and the arguments *a* and *b*; modifications of these arrays may affect subsequent evaluation of the interpolator.
<a name="interpolateObject" href="#interpolateObject">#</a> d3.<b>interpolateObject</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/object.js), [Examples](https://observablehq.com/@d3/d3-interpolateobject)
Returns an interpolator between the two objects *a* and *b*. Internally, an object template is created that has the same properties as *b*. For each property in *b*, if there exists a corresponding property in *a*, a generic interpolator is created for the two elements using [interpolate](#interpolate). If there is no such property, the static value from *b* is used in the template. Then, for the given parameter *t*, the template's embedded interpolators are evaluated and the updated object template is then returned.
For example, if *a* is the object `{x: 0, y: 1}` and *b* is the object `{x: 1, y: 10, z: 100}`, the result of the interpolator for *t* = 0.5 is the object `{x: 0.5, y: 5.5, z: 100}`.
Object interpolation is particularly useful for *dataspace interpolation*, where data is interpolated rather than attribute values. For example, you can interpolate an object which describes an arc in a pie chart, and then use [d3.arc](https://github.com/d3/d3-shape/blob/master/README.md#arc) to compute the new SVG path data.
Note: **no defensive copy** of the template object is created; modifications of the returned object may adversely affect subsequent evaluation of the interpolator. No copy is made for performance reasons; interpolators are often part of the inner loop of [animated transitions](https://github.com/d3/d3-transition).
<a name="interpolateTransformCss" href="#interpolateTransformCss">#</a> d3.<b>interpolateTransformCss</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/transform/index.js#L62), [Examples](https://observablehq.com/@d3/d3-interpolatetransformcss)
Returns an interpolator between the two 2D CSS transforms represented by *a* and *b*. Each transform is decomposed to a standard representation of translate, rotate, *x*-skew and scale; these component transformations are then interpolated. This behavior is standardized by CSS: see [matrix decomposition for animation](http://www.w3.org/TR/css3-2d-transforms/#matrix-decomposition).
<a name="interpolateTransformSvg" href="#interpolateTransformSvg">#</a> d3.<b>interpolateTransformSvg</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/transform/index.js#L63), [Examples](https://observablehq.com/@d3/d3-interpolatetransformcss)
Returns an interpolator between the two 2D SVG transforms represented by *a* and *b*. Each transform is decomposed to a standard representation of translate, rotate, *x*-skew and scale; these component transformations are then interpolated. This behavior is standardized by CSS: see [matrix decomposition for animation](http://www.w3.org/TR/css3-2d-transforms/#matrix-decomposition).
<a name="interpolateZoom" href="#interpolateZoom">#</a> d3.<b>interpolateZoom</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/zoom.js), [Examples](https://observablehq.com/@d3/d3-interpolatezoom)
Returns an interpolator between the two views *a* and *b* of a two-dimensional plane, based on [“Smooth and efficient zooming and panning”](http://www.win.tue.nl/~vanwijk/zoompan.pdf) by Jarke J. van Wijk and Wim A.A. Nuij. Each view is defined as an array of three numbers: *cx*, *cy* and *width*. The first two coordinates *cx*, *cy* represent the center of the viewport; the last coordinate *width* represents the size of the viewport.
The returned interpolator exposes a *duration* property which encodes the recommended transition duration in milliseconds. This duration is based on the path length of the curved trajectory through *x,y* space. If you want a slower or faster transition, multiply this by an arbitrary scale factor (<i>V</i> as described in the original paper).
<a name="interpolate_rho" href="#interpolate_rho">#</a> *interpolateZoom*.<b>rho</b>(<i>rho</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/zoom.js)<!-- , [Examples](https://observablehq.com/@d3/interpolatezoom-rho) -->
Given a [zoom interpolator](#interpolateZoom), returns a new zoom interpolator using the specified curvature *rho*. When *rho* is close to 0, the interpolator is almost linear. The default curvature is sqrt(2).
<a name="interpolateDiscrete" href="#interpolateDiscrete">#</a> d3.<b>interpolateDiscrete</b>(<i>values</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/discrete.js), [Examples](https://observablehq.com/@d3/d3-interpolatediscrete)
Returns a discrete interpolator for the given array of *values*. The returned interpolator maps *t* in [0, 1 / *n*) to *values*[0], *t* in [1 / *n*, 2 / *n*) to *values*[1], and so on, where *n* = *values*.length. In effect, this is a lightweight [quantize scale](https://github.com/d3/d3-scale/blob/master/README.md#quantize-scales) with a fixed domain of [0, 1].
### Sampling
<a name="quantize" href="#quantize">#</a> d3.<b>quantize</b>(<i>interpolator</i>, <i>n</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/quantize.js), [Examples](https://observablehq.com/@d3/d3-quantize)
Returns *n* uniformly-spaced samples from the specified *interpolator*, where *n* is an integer greater than one. The first sample is always at *t* = 0, and the last sample is always at *t* = 1. This can be useful in generating a fixed number of samples from a given interpolator, such as to derive the range of a [quantize scale](https://github.com/d3/d3-scale/blob/master/README.md#quantize-scales) from a [continuous interpolator](https://github.com/d3/d3-scale-chromatic/blob/master/README.md#interpolateWarm).
Caution: this method will not work with interpolators that do not return defensive copies of their output, such as [d3.interpolateArray](#interpolateArray), [d3.interpolateDate](#interpolateDate) and [d3.interpolateObject](#interpolateObject). For those interpolators, you must wrap the interpolator and create a copy for each returned value.
### Color Spaces
<a name="interpolateRgb" href="#interpolateRgb">#</a> d3.<b>interpolateRgb</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/rgb.js), [Examples](https://observablehq.com/@d3/working-with-color)
<img src="https://raw.githubusercontent.com/d3/d3-interpolate/master/img/rgb.png" width="100%" height="40" alt="rgb">
Or, with a corrected [gamma](#interpolate_gamma) of 2.2:
<img src="https://raw.githubusercontent.com/d3/d3-interpolate/master/img/rgbGamma.png" width="100%" height="40" alt="rgbGamma">
Returns an RGB color space interpolator between the two colors *a* and *b* with a configurable [gamma](#interpolate_gamma). If the gamma is not specified, it defaults to 1.0. The colors *a* and *b* need not be in RGB; they will be converted to RGB using [d3.rgb](https://github.com/d3/d3-color/blob/master/README.md#rgb). The return value of the interpolator is an RGB string.
<a href="#interpolateRgbBasis" name="interpolateRgbBasis">#</a> d3.<b>interpolateRgbBasis</b>(<i>colors</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/rgb.js#L54), [Examples](https://observablehq.com/@d3/working-with-color)
Returns a uniform nonrational B-spline interpolator through the specified array of *colors*, which are converted to [RGB color space](https://github.com/d3/d3-color/blob/master/README.md#rgb). Implicit control points are generated such that the interpolator returns *colors*[0] at *t* = 0 and *colors*[*colors*.length - 1] at *t* = 1. Opacity interpolation is not currently supported. See also [d3.interpolateBasis](#interpolateBasis), and see [d3-scale-chromatic](https://github.com/d3/d3-scale-chromatic) for examples.
<a href="#interpolateRgbBasisClosed" name="interpolateRgbBasisClosed">#</a> d3.<b>interpolateRgbBasisClosed</b>(<i>colors</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/rgb.js#L55), [Examples](https://observablehq.com/@d3/working-with-color)
Returns a uniform nonrational B-spline interpolator through the specified array of *colors*, which are converted to [RGB color space](https://github.com/d3/d3-color/blob/master/README.md#rgb). The control points are implicitly repeated such that the resulting spline has cyclical C² continuity when repeated around *t* in [0,1]; this is useful, for example, to create cyclical color scales. Opacity interpolation is not currently supported. See also [d3.interpolateBasisClosed](#interpolateBasisClosed), and see [d3-scale-chromatic](https://github.com/d3/d3-scale-chromatic) for examples.
<a name="interpolateHsl" href="#interpolateHsl">#</a> d3.<b>interpolateHsl</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/hsl.js), [Examples](https://observablehq.com/@d3/working-with-color)
<img src="https://raw.githubusercontent.com/d3/d3-interpolate/master/img/hsl.png" width="100%" height="40" alt="hsl">
Returns an HSL color space interpolator between the two colors *a* and *b*. The colors *a* and *b* need not be in HSL; they will be converted to HSL using [d3.hsl](https://github.com/d3/d3-color/blob/master/README.md#hsl). If either color’s hue or saturation is NaN, the opposing color’s channel value is used. The shortest path between hues is used. The return value of the interpolator is an RGB string.
<a name="interpolateHslLong" href="#interpolateHslLong">#</a> d3.<b>interpolateHslLong</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/hsl.js#L21), [Examples](https://observablehq.com/@d3/working-with-color)
<img src="https://raw.githubusercontent.com/d3/d3-interpolate/master/img/hslLong.png" width="100%" height="40" alt="hslLong">
Like [interpolateHsl](#interpolateHsl), but does not use the shortest path between hues.
<a name="interpolateLab" href="#interpolateLab">#</a> d3.<b>interpolateLab</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/lab.js), [Examples](https://observablehq.com/@d3/working-with-color)
<img src="https://raw.githubusercontent.com/d3/d3-interpolate/master/img/lab.png" width="100%" height="40" alt="lab">
Returns a [CIELAB color space](https://en.wikipedia.org/wiki/Lab_color_space#CIELAB) interpolator between the two colors *a* and *b*. The colors *a* and *b* need not be in CIELAB; they will be converted to CIELAB using [d3.lab](https://github.com/d3/d3-color/blob/master/README.md#lab). The return value of the interpolator is an RGB string.
<a name="interpolateHcl" href="#interpolateHcl">#</a> d3.<b>interpolateHcl</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/hcl.js), [Examples](https://observablehq.com/@d3/working-with-color)
<img src="https://raw.githubusercontent.com/d3/d3-interpolate/master/img/hcl.png" width="100%" height="40" alt="hcl">
Returns a [CIELCh<sub>ab</sub> color space](https://en.wikipedia.org/wiki/CIELAB_color_space#Cylindrical_representation:_CIELCh_or_CIEHLC) interpolator between the two colors *a* and *b*. The colors *a* and *b* need not be in CIELCh<sub>ab</sub>; they will be converted to CIELCh<sub>ab</sub> using [d3.hcl](https://github.com/d3/d3-color/blob/master/README.md#hcl). If either color’s hue or chroma is NaN, the opposing color’s channel value is used. The shortest path between hues is used. The return value of the interpolator is an RGB string.
<a name="interpolateHclLong" href="#interpolateHclLong">#</a> d3.<b>interpolateHclLong</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/hcl.js#L21), [Examples](https://observablehq.com/@d3/working-with-color)
<img src="https://raw.githubusercontent.com/d3/d3-interpolate/master/img/hclLong.png" width="100%" height="40" alt="hclLong">
Like [interpolateHcl](#interpolateHcl), but does not use the shortest path between hues.
<a name="interpolateCubehelix" href="#interpolateCubehelix">#</a> d3.<b>interpolateCubehelix</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/cubehelix.js), [Examples](https://observablehq.com/@d3/working-with-color)
<img src="https://raw.githubusercontent.com/d3/d3-interpolate/master/img/cubehelix.png" width="100%" height="40" alt="cubehelix">
Or, with a [gamma](#interpolate_gamma) of 3.0 to emphasize high-intensity values:
<img src="https://raw.githubusercontent.com/d3/d3-interpolate/master/img/cubehelixGamma.png" width="100%" height="40" alt="cubehelixGamma">
Returns a Cubehelix color space interpolator between the two colors *a* and *b* using a configurable [gamma](#interpolate_gamma). If the gamma is not specified, it defaults to 1.0. The colors *a* and *b* need not be in Cubehelix; they will be converted to Cubehelix using [d3.cubehelix](https://github.com/d3/d3-color/blob/master/README.md#cubehelix). If either color’s hue or saturation is NaN, the opposing color’s channel value is used. The shortest path between hues is used. The return value of the interpolator is an RGB string.
<a name="interpolateCubehelixLong" href="#interpolateCubehelixLong">#</a> d3.<b>interpolateCubehelixLong</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/cubehelix.js#L29), [Examples](https://observablehq.com/@d3/working-with-color)
<img src="https://raw.githubusercontent.com/d3/d3-interpolate/master/img/cubehelixLong.png" width="100%" height="40" alt="cubehelixLong">
Or, with a [gamma](#interpolate_gamma) of 3.0 to emphasize high-intensity values:
<img src="https://raw.githubusercontent.com/d3/d3-interpolate/master/img/cubehelixGammaLong.png" width="100%" height="40" alt="cubehelixGammaLong">
Like [interpolateCubehelix](#interpolateCubehelix), but does not use the shortest path between hues.
<a name="interpolate_gamma" href="#interpolate_gamma">#</a> <i>interpolate</i>.<b>gamma</b>(<i>gamma</i>)
Given that *interpolate* is one of [interpolateRgb](#interpolateRgb), [interpolateCubehelix](#interpolateCubehelix) or [interpolateCubehelixLong](#interpolateCubehelixLong), returns a new interpolator factory of the same type using the specified *gamma*. For example, to interpolate from purple to orange with a gamma of 2.2 in RGB space:
```js
var interpolator = d3.interpolateRgb.gamma(2.2)("purple", "orange");
```
See Eric Brasseur’s article, [Gamma error in picture scaling](http://www.ericbrasseur.org/gamma.html), for more on gamma correction.
<a name="interpolateHue" href="#interpolateHue">#</a> d3.<b>interpolateHue</b>(<i>a</i>, <i>b</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/hue.js), [Examples](https://observablehq.com/@d3/working-with-color)
Returns an interpolator between the two hue angles *a* and *b*. If either hue is NaN, the opposing value is used. The shortest path between hues is used. The return value of the interpolator is a number in [0, 360).
### Splines
Whereas standard interpolators blend from a starting value *a* at *t* = 0 to an ending value *b* at *t* = 1, spline interpolators smoothly blend multiple input values for *t* in [0,1] using piecewise polynomial functions. Only cubic uniform nonrational [B-splines](https://en.wikipedia.org/wiki/B-spline) are currently supported, also known as basis splines.
<a href="#interpolateBasis" name="interpolateBasis">#</a> d3.<b>interpolateBasis</b>(<i>values</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/basis.js), [Examples](https://observablehq.com/@d3/d3-interpolatebasis)
Returns a uniform nonrational B-spline interpolator through the specified array of *values*, which must be numbers. Implicit control points are generated such that the interpolator returns *values*[0] at *t* = 0 and *values*[*values*.length - 1] at *t* = 1. See also [d3.curveBasis](https://github.com/d3/d3-shape/blob/master/README.md#curveBasis).
<a href="#interpolateBasisClosed" name="interpolateBasisClosed">#</a> d3.<b>interpolateBasisClosed</b>(<i>values</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/basisClosed.js), [Examples](https://observablehq.com/@d3/d3-interpolatebasis)
Returns a uniform nonrational B-spline interpolator through the specified array of *values*, which must be numbers. The control points are implicitly repeated such that the resulting one-dimensional spline has cyclical C² continuity when repeated around *t* in [0,1]. See also [d3.curveBasisClosed](https://github.com/d3/d3-shape/blob/master/README.md#curveBasisClosed).
### Piecewise
<a name="piecewise" href="#piecewise">#</a> d3.<b>piecewise</b>([<i>interpolate</i>, ]<i>values</i>) · [Source](https://github.com/d3/d3-interpolate/blob/master/src/piecewise.js), [Examples](https://observablehq.com/@d3/d3-piecewise)
Returns a piecewise interpolator, composing interpolators for each adjacent pair of *values*. The returned interpolator maps *t* in [0, 1 / (*n* - 1)] to *interpolate*(*values*[0], *values*[1]), *t* in [1 / (*n* - 1), 2 / (*n* - 1)] to *interpolate*(*values*[1], *values*[2]), and so on, where *n* = *values*.length. In effect, this is a lightweight [linear scale](https://github.com/d3/d3-scale/blob/master/README.md#linear-scales). For example, to blend through red, green and blue:
```js
var interpolate = d3.piecewise(d3.interpolateRgb.gamma(2.2), ["red", "green", "blue"]);
```
If *interpolate* is not specified, defaults to [d3.interpolate](#interpolate).

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// https://d3js.org/d3-interpolate/ v2.0.1 Copyright 2020 Mike Bostock
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('d3-color')) :
typeof define === 'function' && define.amd ? define(['exports', 'd3-color'], factory) :
(global = global || self, factory(global.d3 = global.d3 || {}, global.d3));
}(this, function (exports, d3Color) { 'use strict';
function basis(t1, v0, v1, v2, v3) {
var t2 = t1 * t1, t3 = t2 * t1;
return ((1 - 3 * t1 + 3 * t2 - t3) * v0
+ (4 - 6 * t2 + 3 * t3) * v1
+ (1 + 3 * t1 + 3 * t2 - 3 * t3) * v2
+ t3 * v3) / 6;
}
function basis$1(values) {
var n = values.length - 1;
return function(t) {
var i = t <= 0 ? (t = 0) : t >= 1 ? (t = 1, n - 1) : Math.floor(t * n),
v1 = values[i],
v2 = values[i + 1],
v0 = i > 0 ? values[i - 1] : 2 * v1 - v2,
v3 = i < n - 1 ? values[i + 2] : 2 * v2 - v1;
return basis((t - i / n) * n, v0, v1, v2, v3);
};
}
function basisClosed(values) {
var n = values.length;
return function(t) {
var i = Math.floor(((t %= 1) < 0 ? ++t : t) * n),
v0 = values[(i + n - 1) % n],
v1 = values[i % n],
v2 = values[(i + 1) % n],
v3 = values[(i + 2) % n];
return basis((t - i / n) * n, v0, v1, v2, v3);
};
}
var constant = x => () => x;
function linear(a, d) {
return function(t) {
return a + t * d;
};
}
function exponential(a, b, y) {
return a = Math.pow(a, y), b = Math.pow(b, y) - a, y = 1 / y, function(t) {
return Math.pow(a + t * b, y);
};
}
function hue(a, b) {
var d = b - a;
return d ? linear(a, d > 180 || d < -180 ? d - 360 * Math.round(d / 360) : d) : constant(isNaN(a) ? b : a);
}
function gamma(y) {
return (y = +y) === 1 ? nogamma : function(a, b) {
return b - a ? exponential(a, b, y) : constant(isNaN(a) ? b : a);
};
}
function nogamma(a, b) {
var d = b - a;
return d ? linear(a, d) : constant(isNaN(a) ? b : a);
}
var rgb = (function rgbGamma(y) {
var color = gamma(y);
function rgb(start, end) {
var r = color((start = d3Color.rgb(start)).r, (end = d3Color.rgb(end)).r),
g = color(start.g, end.g),
b = color(start.b, end.b),
opacity = nogamma(start.opacity, end.opacity);
return function(t) {
start.r = r(t);
start.g = g(t);
start.b = b(t);
start.opacity = opacity(t);
return start + "";
};
}
rgb.gamma = rgbGamma;
return rgb;
})(1);
function rgbSpline(spline) {
return function(colors) {
var n = colors.length,
r = new Array(n),
g = new Array(n),
b = new Array(n),
i, color;
for (i = 0; i < n; ++i) {
color = d3Color.rgb(colors[i]);
r[i] = color.r || 0;
g[i] = color.g || 0;
b[i] = color.b || 0;
}
r = spline(r);
g = spline(g);
b = spline(b);
color.opacity = 1;
return function(t) {
color.r = r(t);
color.g = g(t);
color.b = b(t);
return color + "";
};
};
}
var rgbBasis = rgbSpline(basis$1);
var rgbBasisClosed = rgbSpline(basisClosed);
function numberArray(a, b) {
if (!b) b = [];
var n = a ? Math.min(b.length, a.length) : 0,
c = b.slice(),
i;
return function(t) {
for (i = 0; i < n; ++i) c[i] = a[i] * (1 - t) + b[i] * t;
return c;
};
}
function isNumberArray(x) {
return ArrayBuffer.isView(x) && !(x instanceof DataView);
}
function array(a, b) {
return (isNumberArray(b) ? numberArray : genericArray)(a, b);
}
function genericArray(a, b) {
var nb = b ? b.length : 0,
na = a ? Math.min(nb, a.length) : 0,
x = new Array(na),
c = new Array(nb),
i;
for (i = 0; i < na; ++i) x[i] = value(a[i], b[i]);
for (; i < nb; ++i) c[i] = b[i];
return function(t) {
for (i = 0; i < na; ++i) c[i] = x[i](t);
return c;
};
}
function date(a, b) {
var d = new Date;
return a = +a, b = +b, function(t) {
return d.setTime(a * (1 - t) + b * t), d;
};
}
function number(a, b) {
return a = +a, b = +b, function(t) {
return a * (1 - t) + b * t;
};
}
function object(a, b) {
var i = {},
c = {},
k;
if (a === null || typeof a !== "object") a = {};
if (b === null || typeof b !== "object") b = {};
for (k in b) {
if (k in a) {
i[k] = value(a[k], b[k]);
} else {
c[k] = b[k];
}
}
return function(t) {
for (k in i) c[k] = i[k](t);
return c;
};
}
var reA = /[-+]?(?:\d+\.?\d*|\.?\d+)(?:[eE][-+]?\d+)?/g,
reB = new RegExp(reA.source, "g");
function zero(b) {
return function() {
return b;
};
}
function one(b) {
return function(t) {
return b(t) + "";
};
}
function string(a, b) {
var bi = reA.lastIndex = reB.lastIndex = 0, // scan index for next number in b
am, // current match in a
bm, // current match in b
bs, // string preceding current number in b, if any
i = -1, // index in s
s = [], // string constants and placeholders
q = []; // number interpolators
// Coerce inputs to strings.
a = a + "", b = b + "";
// Interpolate pairs of numbers in a & b.
while ((am = reA.exec(a))
&& (bm = reB.exec(b))) {
if ((bs = bm.index) > bi) { // a string precedes the next number in b
bs = b.slice(bi, bs);
if (s[i]) s[i] += bs; // coalesce with previous string
else s[++i] = bs;
}
if ((am = am[0]) === (bm = bm[0])) { // numbers in a & b match
if (s[i]) s[i] += bm; // coalesce with previous string
else s[++i] = bm;
} else { // interpolate non-matching numbers
s[++i] = null;
q.push({i: i, x: number(am, bm)});
}
bi = reB.lastIndex;
}
// Add remains of b.
if (bi < b.length) {
bs = b.slice(bi);
if (s[i]) s[i] += bs; // coalesce with previous string
else s[++i] = bs;
}
// Special optimization for only a single match.
// Otherwise, interpolate each of the numbers and rejoin the string.
return s.length < 2 ? (q[0]
? one(q[0].x)
: zero(b))
: (b = q.length, function(t) {
for (var i = 0, o; i < b; ++i) s[(o = q[i]).i] = o.x(t);
return s.join("");
});
}
function value(a, b) {
var t = typeof b, c;
return b == null || t === "boolean" ? constant(b)
: (t === "number" ? number
: t === "string" ? ((c = d3Color.color(b)) ? (b = c, rgb) : string)
: b instanceof d3Color.color ? rgb
: b instanceof Date ? date
: isNumberArray(b) ? numberArray
: Array.isArray(b) ? genericArray
: typeof b.valueOf !== "function" && typeof b.toString !== "function" || isNaN(b) ? object
: number)(a, b);
}
function discrete(range) {
var n = range.length;
return function(t) {
return range[Math.max(0, Math.min(n - 1, Math.floor(t * n)))];
};
}
function hue$1(a, b) {
var i = hue(+a, +b);
return function(t) {
var x = i(t);
return x - 360 * Math.floor(x / 360);
};
}
function round(a, b) {
return a = +a, b = +b, function(t) {
return Math.round(a * (1 - t) + b * t);
};
}
var degrees = 180 / Math.PI;
var identity = {
translateX: 0,
translateY: 0,
rotate: 0,
skewX: 0,
scaleX: 1,
scaleY: 1
};
function decompose(a, b, c, d, e, f) {
var scaleX, scaleY, skewX;
if (scaleX = Math.sqrt(a * a + b * b)) a /= scaleX, b /= scaleX;
if (skewX = a * c + b * d) c -= a * skewX, d -= b * skewX;
if (scaleY = Math.sqrt(c * c + d * d)) c /= scaleY, d /= scaleY, skewX /= scaleY;
if (a * d < b * c) a = -a, b = -b, skewX = -skewX, scaleX = -scaleX;
return {
translateX: e,
translateY: f,
rotate: Math.atan2(b, a) * degrees,
skewX: Math.atan(skewX) * degrees,
scaleX: scaleX,
scaleY: scaleY
};
}
var svgNode;
/* eslint-disable no-undef */
function parseCss(value) {
const m = new (typeof DOMMatrix === "function" ? DOMMatrix : WebKitCSSMatrix)(value + "");
return m.isIdentity ? identity : decompose(m.a, m.b, m.c, m.d, m.e, m.f);
}
function parseSvg(value) {
if (value == null) return identity;
if (!svgNode) svgNode = document.createElementNS("http://www.w3.org/2000/svg", "g");
svgNode.setAttribute("transform", value);
if (!(value = svgNode.transform.baseVal.consolidate())) return identity;
value = value.matrix;
return decompose(value.a, value.b, value.c, value.d, value.e, value.f);
}
function interpolateTransform(parse, pxComma, pxParen, degParen) {
function pop(s) {
return s.length ? s.pop() + " " : "";
}
function translate(xa, ya, xb, yb, s, q) {
if (xa !== xb || ya !== yb) {
var i = s.push("translate(", null, pxComma, null, pxParen);
q.push({i: i - 4, x: number(xa, xb)}, {i: i - 2, x: number(ya, yb)});
} else if (xb || yb) {
s.push("translate(" + xb + pxComma + yb + pxParen);
}
}
function rotate(a, b, s, q) {
if (a !== b) {
if (a - b > 180) b += 360; else if (b - a > 180) a += 360; // shortest path
q.push({i: s.push(pop(s) + "rotate(", null, degParen) - 2, x: number(a, b)});
} else if (b) {
s.push(pop(s) + "rotate(" + b + degParen);
}
}
function skewX(a, b, s, q) {
if (a !== b) {
q.push({i: s.push(pop(s) + "skewX(", null, degParen) - 2, x: number(a, b)});
} else if (b) {
s.push(pop(s) + "skewX(" + b + degParen);
}
}
function scale(xa, ya, xb, yb, s, q) {
if (xa !== xb || ya !== yb) {
var i = s.push(pop(s) + "scale(", null, ",", null, ")");
q.push({i: i - 4, x: number(xa, xb)}, {i: i - 2, x: number(ya, yb)});
} else if (xb !== 1 || yb !== 1) {
s.push(pop(s) + "scale(" + xb + "," + yb + ")");
}
}
return function(a, b) {
var s = [], // string constants and placeholders
q = []; // number interpolators
a = parse(a), b = parse(b);
translate(a.translateX, a.translateY, b.translateX, b.translateY, s, q);
rotate(a.rotate, b.rotate, s, q);
skewX(a.skewX, b.skewX, s, q);
scale(a.scaleX, a.scaleY, b.scaleX, b.scaleY, s, q);
a = b = null; // gc
return function(t) {
var i = -1, n = q.length, o;
while (++i < n) s[(o = q[i]).i] = o.x(t);
return s.join("");
};
};
}
var interpolateTransformCss = interpolateTransform(parseCss, "px, ", "px)", "deg)");
var interpolateTransformSvg = interpolateTransform(parseSvg, ", ", ")", ")");
var epsilon2 = 1e-12;
function cosh(x) {
return ((x = Math.exp(x)) + 1 / x) / 2;
}
function sinh(x) {
return ((x = Math.exp(x)) - 1 / x) / 2;
}
function tanh(x) {
return ((x = Math.exp(2 * x)) - 1) / (x + 1);
}
var zoom = (function zoomRho(rho, rho2, rho4) {
// p0 = [ux0, uy0, w0]
// p1 = [ux1, uy1, w1]
function zoom(p0, p1) {
var ux0 = p0[0], uy0 = p0[1], w0 = p0[2],
ux1 = p1[0], uy1 = p1[1], w1 = p1[2],
dx = ux1 - ux0,
dy = uy1 - uy0,
d2 = dx * dx + dy * dy,
i,
S;
// Special case for u0 ≅ u1.
if (d2 < epsilon2) {
S = Math.log(w1 / w0) / rho;
i = function(t) {
return [
ux0 + t * dx,
uy0 + t * dy,
w0 * Math.exp(rho * t * S)
];
};
}
// General case.
else {
var d1 = Math.sqrt(d2),
b0 = (w1 * w1 - w0 * w0 + rho4 * d2) / (2 * w0 * rho2 * d1),
b1 = (w1 * w1 - w0 * w0 - rho4 * d2) / (2 * w1 * rho2 * d1),
r0 = Math.log(Math.sqrt(b0 * b0 + 1) - b0),
r1 = Math.log(Math.sqrt(b1 * b1 + 1) - b1);
S = (r1 - r0) / rho;
i = function(t) {
var s = t * S,
coshr0 = cosh(r0),
u = w0 / (rho2 * d1) * (coshr0 * tanh(rho * s + r0) - sinh(r0));
return [
ux0 + u * dx,
uy0 + u * dy,
w0 * coshr0 / cosh(rho * s + r0)
];
};
}
i.duration = S * 1000 * rho / Math.SQRT2;
return i;
}
zoom.rho = function(_) {
var _1 = Math.max(1e-3, +_), _2 = _1 * _1, _4 = _2 * _2;
return zoomRho(_1, _2, _4);
};
return zoom;
})(Math.SQRT2, 2, 4);
function hsl(hue) {
return function(start, end) {
var h = hue((start = d3Color.hsl(start)).h, (end = d3Color.hsl(end)).h),
s = nogamma(start.s, end.s),
l = nogamma(start.l, end.l),
opacity = nogamma(start.opacity, end.opacity);
return function(t) {
start.h = h(t);
start.s = s(t);
start.l = l(t);
start.opacity = opacity(t);
return start + "";
};
}
}
var hsl$1 = hsl(hue);
var hslLong = hsl(nogamma);
function lab(start, end) {
var l = nogamma((start = d3Color.lab(start)).l, (end = d3Color.lab(end)).l),
a = nogamma(start.a, end.a),
b = nogamma(start.b, end.b),
opacity = nogamma(start.opacity, end.opacity);
return function(t) {
start.l = l(t);
start.a = a(t);
start.b = b(t);
start.opacity = opacity(t);
return start + "";
};
}
function hcl(hue) {
return function(start, end) {
var h = hue((start = d3Color.hcl(start)).h, (end = d3Color.hcl(end)).h),
c = nogamma(start.c, end.c),
l = nogamma(start.l, end.l),
opacity = nogamma(start.opacity, end.opacity);
return function(t) {
start.h = h(t);
start.c = c(t);
start.l = l(t);
start.opacity = opacity(t);
return start + "";
};
}
}
var hcl$1 = hcl(hue);
var hclLong = hcl(nogamma);
function cubehelix(hue) {
return (function cubehelixGamma(y) {
y = +y;
function cubehelix(start, end) {
var h = hue((start = d3Color.cubehelix(start)).h, (end = d3Color.cubehelix(end)).h),
s = nogamma(start.s, end.s),
l = nogamma(start.l, end.l),
opacity = nogamma(start.opacity, end.opacity);
return function(t) {
start.h = h(t);
start.s = s(t);
start.l = l(Math.pow(t, y));
start.opacity = opacity(t);
return start + "";
};
}
cubehelix.gamma = cubehelixGamma;
return cubehelix;
})(1);
}
var cubehelix$1 = cubehelix(hue);
var cubehelixLong = cubehelix(nogamma);
function piecewise(interpolate, values) {
if (values === undefined) values = interpolate, interpolate = value;
var i = 0, n = values.length - 1, v = values[0], I = new Array(n < 0 ? 0 : n);
while (i < n) I[i] = interpolate(v, v = values[++i]);
return function(t) {
var i = Math.max(0, Math.min(n - 1, Math.floor(t *= n)));
return I[i](t - i);
};
}
function quantize(interpolator, n) {
var samples = new Array(n);
for (var i = 0; i < n; ++i) samples[i] = interpolator(i / (n - 1));
return samples;
}
exports.interpolate = value;
exports.interpolateArray = array;
exports.interpolateBasis = basis$1;
exports.interpolateBasisClosed = basisClosed;
exports.interpolateCubehelix = cubehelix$1;
exports.interpolateCubehelixLong = cubehelixLong;
exports.interpolateDate = date;
exports.interpolateDiscrete = discrete;
exports.interpolateHcl = hcl$1;
exports.interpolateHclLong = hclLong;
exports.interpolateHsl = hsl$1;
exports.interpolateHslLong = hslLong;
exports.interpolateHue = hue$1;
exports.interpolateLab = lab;
exports.interpolateNumber = number;
exports.interpolateNumberArray = numberArray;
exports.interpolateObject = object;
exports.interpolateRgb = rgb;
exports.interpolateRgbBasis = rgbBasis;
exports.interpolateRgbBasisClosed = rgbBasisClosed;
exports.interpolateRound = round;
exports.interpolateString = string;
exports.interpolateTransformCss = interpolateTransformCss;
exports.interpolateTransformSvg = interpolateTransformSvg;
exports.interpolateZoom = zoom;
exports.piecewise = piecewise;
exports.quantize = quantize;
Object.defineProperty(exports, '__esModule', { value: true });
}));

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{
"name": "d3-interpolate",
"version": "2.0.1",
"description": "Interpolate numbers, colors, strings, arrays, objects, whatever!",
"keywords": [
"d3",
"d3-module",
"interpolate",
"interpolation",
"color"
],
"homepage": "https://d3js.org/d3-interpolate/",
"license": "BSD-3-Clause",
"author": {
"name": "Mike Bostock",
"url": "http://bost.ocks.org/mike"
},
"main": "dist/d3-interpolate.js",
"unpkg": "dist/d3-interpolate.min.js",
"jsdelivr": "dist/d3-interpolate.min.js",
"module": "src/index.js",
"repository": {
"type": "git",
"url": "https://github.com/d3/d3-interpolate.git"
},
"files": [
"dist/**/*.js",
"src/**/*.js"
],
"scripts": {
"pretest": "rollup -c",
"test": "tape 'test/**/*-test.js' && eslint src",
"prepublishOnly": "rm -rf dist && yarn test",
"postpublish": "git push && git push --tags && cd ../d3.github.com && git pull && cp ../${npm_package_name}/dist/${npm_package_name}.js ${npm_package_name}.v${npm_package_version%%.*}.js && cp ../${npm_package_name}/dist/${npm_package_name}.min.js ${npm_package_name}.v${npm_package_version%%.*}.min.js && git add ${npm_package_name}.v${npm_package_version%%.*}.js ${npm_package_name}.v${npm_package_version%%.*}.min.js && git commit -m \"${npm_package_name} ${npm_package_version}\" && git push && cd - && zip -j dist/${npm_package_name}.zip -- LICENSE README.md dist/${npm_package_name}.js dist/${npm_package_name}.min.js"
},
"dependencies": {
"d3-color": "1 - 2"
},
"sideEffects": false,
"devDependencies": {
"eslint": "6",
"rollup": "1",
"rollup-plugin-terser": "5",
"tape": "4"
}
}

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import value from "./value.js";
import numberArray, {isNumberArray} from "./numberArray.js";
export default function(a, b) {
return (isNumberArray(b) ? numberArray : genericArray)(a, b);
}
export function genericArray(a, b) {
var nb = b ? b.length : 0,
na = a ? Math.min(nb, a.length) : 0,
x = new Array(na),
c = new Array(nb),
i;
for (i = 0; i < na; ++i) x[i] = value(a[i], b[i]);
for (; i < nb; ++i) c[i] = b[i];
return function(t) {
for (i = 0; i < na; ++i) c[i] = x[i](t);
return c;
};
}

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export function basis(t1, v0, v1, v2, v3) {
var t2 = t1 * t1, t3 = t2 * t1;
return ((1 - 3 * t1 + 3 * t2 - t3) * v0
+ (4 - 6 * t2 + 3 * t3) * v1
+ (1 + 3 * t1 + 3 * t2 - 3 * t3) * v2
+ t3 * v3) / 6;
}
export default function(values) {
var n = values.length - 1;
return function(t) {
var i = t <= 0 ? (t = 0) : t >= 1 ? (t = 1, n - 1) : Math.floor(t * n),
v1 = values[i],
v2 = values[i + 1],
v0 = i > 0 ? values[i - 1] : 2 * v1 - v2,
v3 = i < n - 1 ? values[i + 2] : 2 * v2 - v1;
return basis((t - i / n) * n, v0, v1, v2, v3);
};
}

13
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/basisClosed.js generated vendored Normal file
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import {basis} from "./basis.js";
export default function(values) {
var n = values.length;
return function(t) {
var i = Math.floor(((t %= 1) < 0 ? ++t : t) * n),
v0 = values[(i + n - 1) % n],
v1 = values[i % n],
v2 = values[(i + 1) % n],
v3 = values[(i + 2) % n];
return basis((t - i / n) * n, v0, v1, v2, v3);
};
}

29
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/color.js generated vendored Normal file
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import constant from "./constant.js";
function linear(a, d) {
return function(t) {
return a + t * d;
};
}
function exponential(a, b, y) {
return a = Math.pow(a, y), b = Math.pow(b, y) - a, y = 1 / y, function(t) {
return Math.pow(a + t * b, y);
};
}
export function hue(a, b) {
var d = b - a;
return d ? linear(a, d > 180 || d < -180 ? d - 360 * Math.round(d / 360) : d) : constant(isNaN(a) ? b : a);
}
export function gamma(y) {
return (y = +y) === 1 ? nogamma : function(a, b) {
return b - a ? exponential(a, b, y) : constant(isNaN(a) ? b : a);
};
}
export default function nogamma(a, b) {
var d = b - a;
return d ? linear(a, d) : constant(isNaN(a) ? b : a);
}

1
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/constant.js generated vendored Normal file
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export default x => () => x;

29
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/cubehelix.js generated vendored Normal file
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import {cubehelix as colorCubehelix} from "d3-color";
import color, {hue} from "./color.js";
function cubehelix(hue) {
return (function cubehelixGamma(y) {
y = +y;
function cubehelix(start, end) {
var h = hue((start = colorCubehelix(start)).h, (end = colorCubehelix(end)).h),
s = color(start.s, end.s),
l = color(start.l, end.l),
opacity = color(start.opacity, end.opacity);
return function(t) {
start.h = h(t);
start.s = s(t);
start.l = l(Math.pow(t, y));
start.opacity = opacity(t);
return start + "";
};
}
cubehelix.gamma = cubehelixGamma;
return cubehelix;
})(1);
}
export default cubehelix(hue);
export var cubehelixLong = cubehelix(color);

6
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/date.js generated vendored Normal file
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export default function(a, b) {
var d = new Date;
return a = +a, b = +b, function(t) {
return d.setTime(a * (1 - t) + b * t), d;
};
}

6
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/discrete.js generated vendored Normal file
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export default function(range) {
var n = range.length;
return function(t) {
return range[Math.max(0, Math.min(n - 1, Math.floor(t * n)))];
};
}

21
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/hcl.js generated vendored Normal file
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import {hcl as colorHcl} from "d3-color";
import color, {hue} from "./color.js";
function hcl(hue) {
return function(start, end) {
var h = hue((start = colorHcl(start)).h, (end = colorHcl(end)).h),
c = color(start.c, end.c),
l = color(start.l, end.l),
opacity = color(start.opacity, end.opacity);
return function(t) {
start.h = h(t);
start.c = c(t);
start.l = l(t);
start.opacity = opacity(t);
return start + "";
};
}
}
export default hcl(hue);
export var hclLong = hcl(color);

21
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/hsl.js generated vendored Normal file
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import {hsl as colorHsl} from "d3-color";
import color, {hue} from "./color.js";
function hsl(hue) {
return function(start, end) {
var h = hue((start = colorHsl(start)).h, (end = colorHsl(end)).h),
s = color(start.s, end.s),
l = color(start.l, end.l),
opacity = color(start.opacity, end.opacity);
return function(t) {
start.h = h(t);
start.s = s(t);
start.l = l(t);
start.opacity = opacity(t);
return start + "";
};
}
}
export default hsl(hue);
export var hslLong = hsl(color);

9
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/hue.js generated vendored Normal file
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import {hue} from "./color.js";
export default function(a, b) {
var i = hue(+a, +b);
return function(t) {
var x = i(t);
return x - 360 * Math.floor(x / 360);
};
}

21
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/index.js generated vendored Normal file
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export {default as interpolate} from "./value.js";
export {default as interpolateArray} from "./array.js";
export {default as interpolateBasis} from "./basis.js";
export {default as interpolateBasisClosed} from "./basisClosed.js";
export {default as interpolateDate} from "./date.js";
export {default as interpolateDiscrete} from "./discrete.js";
export {default as interpolateHue} from "./hue.js";
export {default as interpolateNumber} from "./number.js";
export {default as interpolateNumberArray} from "./numberArray.js";
export {default as interpolateObject} from "./object.js";
export {default as interpolateRound} from "./round.js";
export {default as interpolateString} from "./string.js";
export {interpolateTransformCss, interpolateTransformSvg} from "./transform/index.js";
export {default as interpolateZoom} from "./zoom.js";
export {default as interpolateRgb, rgbBasis as interpolateRgbBasis, rgbBasisClosed as interpolateRgbBasisClosed} from "./rgb.js";
export {default as interpolateHsl, hslLong as interpolateHslLong} from "./hsl.js";
export {default as interpolateLab} from "./lab.js";
export {default as interpolateHcl, hclLong as interpolateHclLong} from "./hcl.js";
export {default as interpolateCubehelix, cubehelixLong as interpolateCubehelixLong} from "./cubehelix.js";
export {default as piecewise} from "./piecewise.js";
export {default as quantize} from "./quantize.js";

16
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/lab.js generated vendored Normal file
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import {lab as colorLab} from "d3-color";
import color from "./color.js";
export default function lab(start, end) {
var l = color((start = colorLab(start)).l, (end = colorLab(end)).l),
a = color(start.a, end.a),
b = color(start.b, end.b),
opacity = color(start.opacity, end.opacity);
return function(t) {
start.l = l(t);
start.a = a(t);
start.b = b(t);
start.opacity = opacity(t);
return start + "";
};
}

5
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/number.js generated vendored Normal file
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export default function(a, b) {
return a = +a, b = +b, function(t) {
return a * (1 - t) + b * t;
};
}

14
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/numberArray.js generated vendored Normal file
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export default function(a, b) {
if (!b) b = [];
var n = a ? Math.min(b.length, a.length) : 0,
c = b.slice(),
i;
return function(t) {
for (i = 0; i < n; ++i) c[i] = a[i] * (1 - t) + b[i] * t;
return c;
};
}
export function isNumberArray(x) {
return ArrayBuffer.isView(x) && !(x instanceof DataView);
}

23
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/object.js generated vendored Normal file
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import value from "./value.js";
export default function(a, b) {
var i = {},
c = {},
k;
if (a === null || typeof a !== "object") a = {};
if (b === null || typeof b !== "object") b = {};
for (k in b) {
if (k in a) {
i[k] = value(a[k], b[k]);
} else {
c[k] = b[k];
}
}
return function(t) {
for (k in i) c[k] = i[k](t);
return c;
};
}

11
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/piecewise.js generated vendored Normal file
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import {default as value} from "./value.js";
export default function piecewise(interpolate, values) {
if (values === undefined) values = interpolate, interpolate = value;
var i = 0, n = values.length - 1, v = values[0], I = new Array(n < 0 ? 0 : n);
while (i < n) I[i] = interpolate(v, v = values[++i]);
return function(t) {
var i = Math.max(0, Math.min(n - 1, Math.floor(t *= n)));
return I[i](t - i);
};
}

5
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/quantize.js generated vendored Normal file
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export default function(interpolator, n) {
var samples = new Array(n);
for (var i = 0; i < n; ++i) samples[i] = interpolator(i / (n - 1));
return samples;
}

55
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/rgb.js generated vendored Normal file
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import {rgb as colorRgb} from "d3-color";
import basis from "./basis.js";
import basisClosed from "./basisClosed.js";
import nogamma, {gamma} from "./color.js";
export default (function rgbGamma(y) {
var color = gamma(y);
function rgb(start, end) {
var r = color((start = colorRgb(start)).r, (end = colorRgb(end)).r),
g = color(start.g, end.g),
b = color(start.b, end.b),
opacity = nogamma(start.opacity, end.opacity);
return function(t) {
start.r = r(t);
start.g = g(t);
start.b = b(t);
start.opacity = opacity(t);
return start + "";
};
}
rgb.gamma = rgbGamma;
return rgb;
})(1);
function rgbSpline(spline) {
return function(colors) {
var n = colors.length,
r = new Array(n),
g = new Array(n),
b = new Array(n),
i, color;
for (i = 0; i < n; ++i) {
color = colorRgb(colors[i]);
r[i] = color.r || 0;
g[i] = color.g || 0;
b[i] = color.b || 0;
}
r = spline(r);
g = spline(g);
b = spline(b);
color.opacity = 1;
return function(t) {
color.r = r(t);
color.g = g(t);
color.b = b(t);
return color + "";
};
};
}
export var rgbBasis = rgbSpline(basis);
export var rgbBasisClosed = rgbSpline(basisClosed);

5
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/round.js generated vendored Normal file
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export default function(a, b) {
return a = +a, b = +b, function(t) {
return Math.round(a * (1 - t) + b * t);
};
}

64
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/string.js generated vendored Normal file
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import number from "./number.js";
var reA = /[-+]?(?:\d+\.?\d*|\.?\d+)(?:[eE][-+]?\d+)?/g,
reB = new RegExp(reA.source, "g");
function zero(b) {
return function() {
return b;
};
}
function one(b) {
return function(t) {
return b(t) + "";
};
}
export default function(a, b) {
var bi = reA.lastIndex = reB.lastIndex = 0, // scan index for next number in b
am, // current match in a
bm, // current match in b
bs, // string preceding current number in b, if any
i = -1, // index in s
s = [], // string constants and placeholders
q = []; // number interpolators
// Coerce inputs to strings.
a = a + "", b = b + "";
// Interpolate pairs of numbers in a & b.
while ((am = reA.exec(a))
&& (bm = reB.exec(b))) {
if ((bs = bm.index) > bi) { // a string precedes the next number in b
bs = b.slice(bi, bs);
if (s[i]) s[i] += bs; // coalesce with previous string
else s[++i] = bs;
}
if ((am = am[0]) === (bm = bm[0])) { // numbers in a & b match
if (s[i]) s[i] += bm; // coalesce with previous string
else s[++i] = bm;
} else { // interpolate non-matching numbers
s[++i] = null;
q.push({i: i, x: number(am, bm)});
}
bi = reB.lastIndex;
}
// Add remains of b.
if (bi < b.length) {
bs = b.slice(bi);
if (s[i]) s[i] += bs; // coalesce with previous string
else s[++i] = bs;
}
// Special optimization for only a single match.
// Otherwise, interpolate each of the numbers and rejoin the string.
return s.length < 2 ? (q[0]
? one(q[0].x)
: zero(b))
: (b = q.length, function(t) {
for (var i = 0, o; i < b; ++i) s[(o = q[i]).i] = o.x(t);
return s.join("");
});
}

26
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/transform/decompose.js generated vendored Normal file
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var degrees = 180 / Math.PI;
export var identity = {
translateX: 0,
translateY: 0,
rotate: 0,
skewX: 0,
scaleX: 1,
scaleY: 1
};
export default function(a, b, c, d, e, f) {
var scaleX, scaleY, skewX;
if (scaleX = Math.sqrt(a * a + b * b)) a /= scaleX, b /= scaleX;
if (skewX = a * c + b * d) c -= a * skewX, d -= b * skewX;
if (scaleY = Math.sqrt(c * c + d * d)) c /= scaleY, d /= scaleY, skewX /= scaleY;
if (a * d < b * c) a = -a, b = -b, skewX = -skewX, scaleX = -scaleX;
return {
translateX: e,
translateY: f,
rotate: Math.atan2(b, a) * degrees,
skewX: Math.atan(skewX) * degrees,
scaleX: scaleX,
scaleY: scaleY
};
}

63
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/transform/index.js generated vendored Normal file
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import number from "../number.js";
import {parseCss, parseSvg} from "./parse.js";
function interpolateTransform(parse, pxComma, pxParen, degParen) {
function pop(s) {
return s.length ? s.pop() + " " : "";
}
function translate(xa, ya, xb, yb, s, q) {
if (xa !== xb || ya !== yb) {
var i = s.push("translate(", null, pxComma, null, pxParen);
q.push({i: i - 4, x: number(xa, xb)}, {i: i - 2, x: number(ya, yb)});
} else if (xb || yb) {
s.push("translate(" + xb + pxComma + yb + pxParen);
}
}
function rotate(a, b, s, q) {
if (a !== b) {
if (a - b > 180) b += 360; else if (b - a > 180) a += 360; // shortest path
q.push({i: s.push(pop(s) + "rotate(", null, degParen) - 2, x: number(a, b)});
} else if (b) {
s.push(pop(s) + "rotate(" + b + degParen);
}
}
function skewX(a, b, s, q) {
if (a !== b) {
q.push({i: s.push(pop(s) + "skewX(", null, degParen) - 2, x: number(a, b)});
} else if (b) {
s.push(pop(s) + "skewX(" + b + degParen);
}
}
function scale(xa, ya, xb, yb, s, q) {
if (xa !== xb || ya !== yb) {
var i = s.push(pop(s) + "scale(", null, ",", null, ")");
q.push({i: i - 4, x: number(xa, xb)}, {i: i - 2, x: number(ya, yb)});
} else if (xb !== 1 || yb !== 1) {
s.push(pop(s) + "scale(" + xb + "," + yb + ")");
}
}
return function(a, b) {
var s = [], // string constants and placeholders
q = []; // number interpolators
a = parse(a), b = parse(b);
translate(a.translateX, a.translateY, b.translateX, b.translateY, s, q);
rotate(a.rotate, b.rotate, s, q);
skewX(a.skewX, b.skewX, s, q);
scale(a.scaleX, a.scaleY, b.scaleX, b.scaleY, s, q);
a = b = null; // gc
return function(t) {
var i = -1, n = q.length, o;
while (++i < n) s[(o = q[i]).i] = o.x(t);
return s.join("");
};
};
}
export var interpolateTransformCss = interpolateTransform(parseCss, "px, ", "px)", "deg)");
export var interpolateTransformSvg = interpolateTransform(parseSvg, ", ", ")", ")");

18
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/transform/parse.js generated vendored Normal file
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import decompose, {identity} from "./decompose.js";
var svgNode;
/* eslint-disable no-undef */
export function parseCss(value) {
const m = new (typeof DOMMatrix === "function" ? DOMMatrix : WebKitCSSMatrix)(value + "");
return m.isIdentity ? identity : decompose(m.a, m.b, m.c, m.d, m.e, m.f);
}
export function parseSvg(value) {
if (value == null) return identity;
if (!svgNode) svgNode = document.createElementNS("http://www.w3.org/2000/svg", "g");
svgNode.setAttribute("transform", value);
if (!(value = svgNode.transform.baseVal.consolidate())) return identity;
value = value.matrix;
return decompose(value.a, value.b, value.c, value.d, value.e, value.f);
}

22
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/value.js generated vendored Normal file
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import {color} from "d3-color";
import rgb from "./rgb.js";
import {genericArray} from "./array.js";
import date from "./date.js";
import number from "./number.js";
import object from "./object.js";
import string from "./string.js";
import constant from "./constant.js";
import numberArray, {isNumberArray} from "./numberArray.js";
export default function(a, b) {
var t = typeof b, c;
return b == null || t === "boolean" ? constant(b)
: (t === "number" ? number
: t === "string" ? ((c = color(b)) ? (b = c, rgb) : string)
: b instanceof color ? rgb
: b instanceof Date ? date
: isNumberArray(b) ? numberArray
: Array.isArray(b) ? genericArray
: typeof b.valueOf !== "function" && typeof b.toString !== "function" || isNaN(b) ? object
: number)(a, b);
}

71
frontend/node_modules/d3-zoom/node_modules/d3-interpolate/src/zoom.js generated vendored Normal file
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var epsilon2 = 1e-12;
function cosh(x) {
return ((x = Math.exp(x)) + 1 / x) / 2;
}
function sinh(x) {
return ((x = Math.exp(x)) - 1 / x) / 2;
}
function tanh(x) {
return ((x = Math.exp(2 * x)) - 1) / (x + 1);
}
export default (function zoomRho(rho, rho2, rho4) {
// p0 = [ux0, uy0, w0]
// p1 = [ux1, uy1, w1]
function zoom(p0, p1) {
var ux0 = p0[0], uy0 = p0[1], w0 = p0[2],
ux1 = p1[0], uy1 = p1[1], w1 = p1[2],
dx = ux1 - ux0,
dy = uy1 - uy0,
d2 = dx * dx + dy * dy,
i,
S;
// Special case for u0 ≅ u1.
if (d2 < epsilon2) {
S = Math.log(w1 / w0) / rho;
i = function(t) {
return [
ux0 + t * dx,
uy0 + t * dy,
w0 * Math.exp(rho * t * S)
];
}
}
// General case.
else {
var d1 = Math.sqrt(d2),
b0 = (w1 * w1 - w0 * w0 + rho4 * d2) / (2 * w0 * rho2 * d1),
b1 = (w1 * w1 - w0 * w0 - rho4 * d2) / (2 * w1 * rho2 * d1),
r0 = Math.log(Math.sqrt(b0 * b0 + 1) - b0),
r1 = Math.log(Math.sqrt(b1 * b1 + 1) - b1);
S = (r1 - r0) / rho;
i = function(t) {
var s = t * S,
coshr0 = cosh(r0),
u = w0 / (rho2 * d1) * (coshr0 * tanh(rho * s + r0) - sinh(r0));
return [
ux0 + u * dx,
uy0 + u * dy,
w0 * coshr0 / cosh(rho * s + r0)
];
}
}
i.duration = S * 1000 * rho / Math.SQRT2;
return i;
}
zoom.rho = function(_) {
var _1 = Math.max(1e-3, +_), _2 = _1 * _1, _4 = _2 * _2;
return zoomRho(_1, _2, _4);
};
return zoom;
})(Math.SQRT2, 2, 4);

50
frontend/node_modules/d3-zoom/package.json generated vendored Normal file
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{
"name": "d3-zoom",
"version": "2.0.0",
"description": "Pan and zoom SVG, HTML or Canvas using mouse or touch input.",
"keywords": [
"d3",
"d3-module",
"zoom",
"behavior",
"interaction"
],
"homepage": "https://d3js.org/d3-zoom/",
"license": "BSD-3-Clause",
"author": {
"name": "Mike Bostock",
"url": "http://bost.ocks.org/mike"
},
"main": "dist/d3-zoom.js",
"unpkg": "dist/d3-zoom.min.js",
"jsdelivr": "dist/d3-zoom.min.js",
"module": "src/index.js",
"repository": {
"type": "git",
"url": "https://github.com/d3/d3-zoom.git"
},
"files": [
"dist/**/*.js",
"src/**/*.js"
],
"scripts": {
"pretest": "rollup -c",
"test": "tape 'test/**/*-test.js' && eslint src",
"prepublishOnly": "rm -rf dist && yarn test",
"postpublish": "git push && git push --tags && cd ../d3.github.com && git pull && cp ../${npm_package_name}/dist/${npm_package_name}.js ${npm_package_name}.v${npm_package_version%%.*}.js && cp ../${npm_package_name}/dist/${npm_package_name}.min.js ${npm_package_name}.v${npm_package_version%%.*}.min.js && git add ${npm_package_name}.v${npm_package_version%%.*}.js ${npm_package_name}.v${npm_package_version%%.*}.min.js && git commit -m \"${npm_package_name} ${npm_package_version}\" && git push && cd - && zip -j dist/${npm_package_name}.zip -- LICENSE README.md dist/${npm_package_name}.js dist/${npm_package_name}.min.js"
},
"dependencies": {
"d3-dispatch": "1 - 2",
"d3-drag": "2",
"d3-interpolate": "1 - 2",
"d3-selection": "2",
"d3-transition": "2"
},
"devDependencies": {
"eslint": "6",
"jsdom": "^16.2.2",
"rollup": "1",
"rollup-plugin-terser": "5",
"tape": "4"
}
}

1
frontend/node_modules/d3-zoom/src/constant.js generated vendored Normal file
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export default x => () => x;

14
frontend/node_modules/d3-zoom/src/event.js generated vendored Normal file
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export default function ZoomEvent(type, {
sourceEvent,
target,
transform,
dispatch
}) {
Object.defineProperties(this, {
type: {value: type, enumerable: true, configurable: true},
sourceEvent: {value: sourceEvent, enumerable: true, configurable: true},
target: {value: target, enumerable: true, configurable: true},
transform: {value: transform, enumerable: true, configurable: true},
_: {value: dispatch}
});
}

2
frontend/node_modules/d3-zoom/src/index.js generated vendored Normal file
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export {default as zoom} from "./zoom.js";
export {default as zoomTransform, identity as zoomIdentity} from "./transform.js";

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frontend/node_modules/d3-zoom/src/noevent.js generated vendored Normal file
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export function nopropagation(event) {
event.stopImmediatePropagation();
}
export default function(event) {
event.preventDefault();
event.stopImmediatePropagation();
}

51
frontend/node_modules/d3-zoom/src/transform.js generated vendored Normal file
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export function Transform(k, x, y) {
this.k = k;
this.x = x;
this.y = y;
}
Transform.prototype = {
constructor: Transform,
scale: function(k) {
return k === 1 ? this : new Transform(this.k * k, this.x, this.y);
},
translate: function(x, y) {
return x === 0 & y === 0 ? this : new Transform(this.k, this.x + this.k * x, this.y + this.k * y);
},
apply: function(point) {
return [point[0] * this.k + this.x, point[1] * this.k + this.y];
},
applyX: function(x) {
return x * this.k + this.x;
},
applyY: function(y) {
return y * this.k + this.y;
},
invert: function(location) {
return [(location[0] - this.x) / this.k, (location[1] - this.y) / this.k];
},
invertX: function(x) {
return (x - this.x) / this.k;
},
invertY: function(y) {
return (y - this.y) / this.k;
},
rescaleX: function(x) {
return x.copy().domain(x.range().map(this.invertX, this).map(x.invert, x));
},
rescaleY: function(y) {
return y.copy().domain(y.range().map(this.invertY, this).map(y.invert, y));
},
toString: function() {
return "translate(" + this.x + "," + this.y + ") scale(" + this.k + ")";
}
};
export var identity = new Transform(1, 0, 0);
transform.prototype = Transform.prototype;
export default function transform(node) {
while (!node.__zoom) if (!(node = node.parentNode)) return identity;
return node.__zoom;
}

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frontend/node_modules/d3-zoom/src/zoom.js generated vendored Normal file
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import {dispatch} from "d3-dispatch";
import {dragDisable, dragEnable} from "d3-drag";
import {interpolateZoom} from "d3-interpolate";
import {select, pointer} from "d3-selection";
import {interrupt} from "d3-transition";
import constant from "./constant.js";
import ZoomEvent from "./event.js";
import {Transform, identity} from "./transform.js";
import noevent, {nopropagation} from "./noevent.js";
// Ignore right-click, since that should open the context menu.
// except for pinch-to-zoom, which is sent as a wheel+ctrlKey event
function defaultFilter(event) {
return (!event.ctrlKey || event.type === 'wheel') && !event.button;
}
function defaultExtent() {
var e = this;
if (e instanceof SVGElement) {
e = e.ownerSVGElement || e;
if (e.hasAttribute("viewBox")) {
e = e.viewBox.baseVal;
return [[e.x, e.y], [e.x + e.width, e.y + e.height]];
}
return [[0, 0], [e.width.baseVal.value, e.height.baseVal.value]];
}
return [[0, 0], [e.clientWidth, e.clientHeight]];
}
function defaultTransform() {
return this.__zoom || identity;
}
function defaultWheelDelta(event) {
return -event.deltaY * (event.deltaMode === 1 ? 0.05 : event.deltaMode ? 1 : 0.002) * (event.ctrlKey ? 10 : 1);
}
function defaultTouchable() {
return navigator.maxTouchPoints || ("ontouchstart" in this);
}
function defaultConstrain(transform, extent, translateExtent) {
var dx0 = transform.invertX(extent[0][0]) - translateExtent[0][0],
dx1 = transform.invertX(extent[1][0]) - translateExtent[1][0],
dy0 = transform.invertY(extent[0][1]) - translateExtent[0][1],
dy1 = transform.invertY(extent[1][1]) - translateExtent[1][1];
return transform.translate(
dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1),
dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1)
);
}
export default function() {
var filter = defaultFilter,
extent = defaultExtent,
constrain = defaultConstrain,
wheelDelta = defaultWheelDelta,
touchable = defaultTouchable,
scaleExtent = [0, Infinity],
translateExtent = [[-Infinity, -Infinity], [Infinity, Infinity]],
duration = 250,
interpolate = interpolateZoom,
listeners = dispatch("start", "zoom", "end"),
touchstarting,
touchfirst,
touchending,
touchDelay = 500,
wheelDelay = 150,
clickDistance2 = 0,
tapDistance = 10;
function zoom(selection) {
selection
.property("__zoom", defaultTransform)
.on("wheel.zoom", wheeled)
.on("mousedown.zoom", mousedowned)
.on("dblclick.zoom", dblclicked)
.filter(touchable)
.on("touchstart.zoom", touchstarted)
.on("touchmove.zoom", touchmoved)
.on("touchend.zoom touchcancel.zoom", touchended)
.style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
}
zoom.transform = function(collection, transform, point, event) {
var selection = collection.selection ? collection.selection() : collection;
selection.property("__zoom", defaultTransform);
if (collection !== selection) {
schedule(collection, transform, point, event);
} else {
selection.interrupt().each(function() {
gesture(this, arguments)
.event(event)
.start()
.zoom(null, typeof transform === "function" ? transform.apply(this, arguments) : transform)
.end();
});
}
};
zoom.scaleBy = function(selection, k, p, event) {
zoom.scaleTo(selection, function() {
var k0 = this.__zoom.k,
k1 = typeof k === "function" ? k.apply(this, arguments) : k;
return k0 * k1;
}, p, event);
};
zoom.scaleTo = function(selection, k, p, event) {
zoom.transform(selection, function() {
var e = extent.apply(this, arguments),
t0 = this.__zoom,
p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p,
p1 = t0.invert(p0),
k1 = typeof k === "function" ? k.apply(this, arguments) : k;
return constrain(translate(scale(t0, k1), p0, p1), e, translateExtent);
}, p, event);
};
zoom.translateBy = function(selection, x, y, event) {
zoom.transform(selection, function() {
return constrain(this.__zoom.translate(
typeof x === "function" ? x.apply(this, arguments) : x,
typeof y === "function" ? y.apply(this, arguments) : y
), extent.apply(this, arguments), translateExtent);
}, null, event);
};
zoom.translateTo = function(selection, x, y, p, event) {
zoom.transform(selection, function() {
var e = extent.apply(this, arguments),
t = this.__zoom,
p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p;
return constrain(identity.translate(p0[0], p0[1]).scale(t.k).translate(
typeof x === "function" ? -x.apply(this, arguments) : -x,
typeof y === "function" ? -y.apply(this, arguments) : -y
), e, translateExtent);
}, p, event);
};
function scale(transform, k) {
k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], k));
return k === transform.k ? transform : new Transform(k, transform.x, transform.y);
}
function translate(transform, p0, p1) {
var x = p0[0] - p1[0] * transform.k, y = p0[1] - p1[1] * transform.k;
return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y);
}
function centroid(extent) {
return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
}
function schedule(transition, transform, point, event) {
transition
.on("start.zoom", function() { gesture(this, arguments).event(event).start(); })
.on("interrupt.zoom end.zoom", function() { gesture(this, arguments).event(event).end(); })
.tween("zoom", function() {
var that = this,
args = arguments,
g = gesture(that, args).event(event),
e = extent.apply(that, args),
p = point == null ? centroid(e) : typeof point === "function" ? point.apply(that, args) : point,
w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
a = that.__zoom,
b = typeof transform === "function" ? transform.apply(that, args) : transform,
i = interpolate(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
return function(t) {
if (t === 1) t = b; // Avoid rounding error on end.
else { var l = i(t), k = w / l[2]; t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k); }
g.zoom(null, t);
};
});
}
function gesture(that, args, clean) {
return (!clean && that.__zooming) || new Gesture(that, args);
}
function Gesture(that, args) {
this.that = that;
this.args = args;
this.active = 0;
this.sourceEvent = null;
this.extent = extent.apply(that, args);
this.taps = 0;
}
Gesture.prototype = {
event: function(event) {
if (event) this.sourceEvent = event;
return this;
},
start: function() {
if (++this.active === 1) {
this.that.__zooming = this;
this.emit("start");
}
return this;
},
zoom: function(key, transform) {
if (this.mouse && key !== "mouse") this.mouse[1] = transform.invert(this.mouse[0]);
if (this.touch0 && key !== "touch") this.touch0[1] = transform.invert(this.touch0[0]);
if (this.touch1 && key !== "touch") this.touch1[1] = transform.invert(this.touch1[0]);
this.that.__zoom = transform;
this.emit("zoom");
return this;
},
end: function() {
if (--this.active === 0) {
delete this.that.__zooming;
this.emit("end");
}
return this;
},
emit: function(type) {
var d = select(this.that).datum();
listeners.call(
type,
this.that,
new ZoomEvent(type, {
sourceEvent: this.sourceEvent,
target: zoom,
type,
transform: this.that.__zoom,
dispatch: listeners
}),
d
);
}
};
function wheeled(event, ...args) {
if (!filter.apply(this, arguments)) return;
var g = gesture(this, args).event(event),
t = this.__zoom,
k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], t.k * Math.pow(2, wheelDelta.apply(this, arguments)))),
p = pointer(event);
// If the mouse is in the same location as before, reuse it.
// If there were recent wheel events, reset the wheel idle timeout.
if (g.wheel) {
if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) {
g.mouse[1] = t.invert(g.mouse[0] = p);
}
clearTimeout(g.wheel);
}
// If this wheel event won’t trigger a transform change, ignore it.
else if (t.k === k) return;
// Otherwise, capture the mouse point and location at the start.
else {
g.mouse = [p, t.invert(p)];
interrupt(this);
g.start();
}
noevent(event);
g.wheel = setTimeout(wheelidled, wheelDelay);
g.zoom("mouse", constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent, translateExtent));
function wheelidled() {
g.wheel = null;
g.end();
}
}
function mousedowned(event, ...args) {
if (touchending || !filter.apply(this, arguments)) return;
var g = gesture(this, args, true).event(event),
v = select(event.view).on("mousemove.zoom", mousemoved, true).on("mouseup.zoom", mouseupped, true),
p = pointer(event, currentTarget),
currentTarget = event.currentTarget,
x0 = event.clientX,
y0 = event.clientY;
dragDisable(event.view);
nopropagation(event);
g.mouse = [p, this.__zoom.invert(p)];
interrupt(this);
g.start();
function mousemoved(event) {
noevent(event);
if (!g.moved) {
var dx = event.clientX - x0, dy = event.clientY - y0;
g.moved = dx * dx + dy * dy > clickDistance2;
}
g.event(event)
.zoom("mouse", constrain(translate(g.that.__zoom, g.mouse[0] = pointer(event, currentTarget), g.mouse[1]), g.extent, translateExtent));
}
function mouseupped(event) {
v.on("mousemove.zoom mouseup.zoom", null);
dragEnable(event.view, g.moved);
noevent(event);
g.event(event).end();
}
}
function dblclicked(event, ...args) {
if (!filter.apply(this, arguments)) return;
var t0 = this.__zoom,
p0 = pointer(event.changedTouches ? event.changedTouches[0] : event, this),
p1 = t0.invert(p0),
k1 = t0.k * (event.shiftKey ? 0.5 : 2),
t1 = constrain(translate(scale(t0, k1), p0, p1), extent.apply(this, args), translateExtent);
noevent(event);
if (duration > 0) select(this).transition().duration(duration).call(schedule, t1, p0, event);
else select(this).call(zoom.transform, t1, p0, event);
}
function touchstarted(event, ...args) {
if (!filter.apply(this, arguments)) return;
var touches = event.touches,
n = touches.length,
g = gesture(this, args, event.changedTouches.length === n).event(event),
started, i, t, p;
nopropagation(event);
for (i = 0; i < n; ++i) {
t = touches[i], p = pointer(t, this);
p = [p, this.__zoom.invert(p), t.identifier];
if (!g.touch0) g.touch0 = p, started = true, g.taps = 1 + !!touchstarting;
else if (!g.touch1 && g.touch0[2] !== p[2]) g.touch1 = p, g.taps = 0;
}
if (touchstarting) touchstarting = clearTimeout(touchstarting);
if (started) {
if (g.taps < 2) touchfirst = p[0], touchstarting = setTimeout(function() { touchstarting = null; }, touchDelay);
interrupt(this);
g.start();
}
}
function touchmoved(event, ...args) {
if (!this.__zooming) return;
var g = gesture(this, args).event(event),
touches = event.changedTouches,
n = touches.length, i, t, p, l;
noevent(event);
for (i = 0; i < n; ++i) {
t = touches[i], p = pointer(t, this);
if (g.touch0 && g.touch0[2] === t.identifier) g.touch0[0] = p;
else if (g.touch1 && g.touch1[2] === t.identifier) g.touch1[0] = p;
}
t = g.that.__zoom;
if (g.touch1) {
var p0 = g.touch0[0], l0 = g.touch0[1],
p1 = g.touch1[0], l1 = g.touch1[1],
dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp,
dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl;
t = scale(t, Math.sqrt(dp / dl));
p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
}
else if (g.touch0) p = g.touch0[0], l = g.touch0[1];
else return;
g.zoom("touch", constrain(translate(t, p, l), g.extent, translateExtent));
}
function touchended(event, ...args) {
if (!this.__zooming) return;
var g = gesture(this, args).event(event),
touches = event.changedTouches,
n = touches.length, i, t;
nopropagation(event);
if (touchending) clearTimeout(touchending);
touchending = setTimeout(function() { touchending = null; }, touchDelay);
for (i = 0; i < n; ++i) {
t = touches[i];
if (g.touch0 && g.touch0[2] === t.identifier) delete g.touch0;
else if (g.touch1 && g.touch1[2] === t.identifier) delete g.touch1;
}
if (g.touch1 && !g.touch0) g.touch0 = g.touch1, delete g.touch1;
if (g.touch0) g.touch0[1] = this.__zoom.invert(g.touch0[0]);
else {
g.end();
// If this was a dbltap, reroute to the (optional) dblclick.zoom handler.
if (g.taps === 2) {
t = pointer(t, this);
if (Math.hypot(touchfirst[0] - t[0], touchfirst[1] - t[1]) < tapDistance) {
var p = select(this).on("dblclick.zoom");
if (p) p.apply(this, arguments);
}
}
}
}
zoom.wheelDelta = function(_) {
return arguments.length ? (wheelDelta = typeof _ === "function" ? _ : constant(+_), zoom) : wheelDelta;
};
zoom.filter = function(_) {
return arguments.length ? (filter = typeof _ === "function" ? _ : constant(!!_), zoom) : filter;
};
zoom.touchable = function(_) {
return arguments.length ? (touchable = typeof _ === "function" ? _ : constant(!!_), zoom) : touchable;
};
zoom.extent = function(_) {
return arguments.length ? (extent = typeof _ === "function" ? _ : constant([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
};
zoom.scaleExtent = function(_) {
return arguments.length ? (scaleExtent[0] = +_[0], scaleExtent[1] = +_[1], zoom) : [scaleExtent[0], scaleExtent[1]];
};
zoom.translateExtent = function(_) {
return arguments.length ? (translateExtent[0][0] = +_[0][0], translateExtent[1][0] = +_[1][0], translateExtent[0][1] = +_[0][1], translateExtent[1][1] = +_[1][1], zoom) : [[translateExtent[0][0], translateExtent[0][1]], [translateExtent[1][0], translateExtent[1][1]]];
};
zoom.constrain = function(_) {
return arguments.length ? (constrain = _, zoom) : constrain;
};
zoom.duration = function(_) {
return arguments.length ? (duration = +_, zoom) : duration;
};
zoom.interpolate = function(_) {
return arguments.length ? (interpolate = _, zoom) : interpolate;
};
zoom.on = function() {
var value = listeners.on.apply(listeners, arguments);
return value === listeners ? zoom : value;
};
zoom.clickDistance = function(_) {
return arguments.length ? (clickDistance2 = (_ = +_) * _, zoom) : Math.sqrt(clickDistance2);
};
zoom.tapDistance = function(_) {
return arguments.length ? (tapDistance = +_, zoom) : tapDistance;
};
return zoom;
}