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* Paper.js - The Swiss Army Knife of Vector Graphics Scripting.
* http://paperjs.org/
*
* Copyright (c) 2011 - 2020, Jürg Lehni & Jonathan Puckey
* http://juerglehni.com/ & https://puckey.studio/
*
* Distributed under the MIT license. See LICENSE file for details.
*
* All rights reserved.
*/
// TODO: remove eslint-disable comment and deal with errors over time
/* eslint-disable */
import { Base } from '~/straps';
import { Change } from '~/item/ChangeFlag';
import { Color } from './Color';
// TODO: Support midPoint? (initial tests didn't look nice)
/**
* @name GradientStop
*
* @class The GradientStop object.
*/
export const GradientStop = Base.extend(
/** @lends GradientStop# */ {
_class: 'GradientStop',
/**
* Creates a GradientStop object.
*
* @param {Color} [color=new Color(0, 0, 0)] the color of the stop
* @param {Number} [offset=null] the position of the stop on the gradient
* ramp as a value between `0` and `1`; `null` or `undefined` for automatic
* assignment.
*/
initialize: function GradientStop(arg0, arg1) {
// (color, offset)
var color = arg0,
offset = arg1;
if (typeof arg0 === 'object' && arg1 === undefined) {
// Make sure the first entry in the array is not a number, in which
// case the whole array would be a color, and the assignments would
// already have occurred correctly above.
if (Array.isArray(arg0) && typeof arg0[0] !== 'number') {
// ([color, offset])
color = arg0[0];
offset = arg0[1];
} else if ('color' in arg0 || 'offset' in arg0 || 'rampPoint' in arg0) {
// (stop)
color = arg0.color;
offset = arg0.offset || arg0.rampPoint || 0;
}
}
this.setColor(color);
this.setOffset(offset);
},
// TODO: Do we really need to also clone the color here?
/**
* @return {GradientStop} a copy of the gradient-stop
*/
clone: function () {
return new GradientStop(this._color.clone(), this._offset);
},
_serialize: function (options, dictionary) {
var color = this._color,
offset = this._offset;
return Base.serialize(offset == null ? [color] : [color, offset], options, true, dictionary);
},
/**
* Called by various setters whenever a value changes
*/
_changed: function () {
// Notify the graident that uses this stop about the change, so it can
// notify its gradient colors, which in turn will notify the items they
// are used in:
if (this._owner) this._owner._changed(/*#=*/ Change.STYLE);
},
/**
* The ramp-point of the gradient stop as a value between `0` and `1`.
*
* @bean
* @type Number
*
* @example {@paperscript height=300}
* // Animating a gradient's ramp points:
*
* // Create a circle shaped path at the center of the view,
* // using 40% of the height of the view as its radius
* // and fill it with a radial gradient color:
* var path = new Path.Circle({
* center: view.center,
* radius: view.bounds.height * 0.4
* });
*
* path.fillColor = {
* gradient: {
* stops: [['yellow', 0.05], ['red', 0.2], ['black', 1]],
* radial: true
* },
* origin: path.position,
* destination: path.bounds.rightCenter
* };
*
* var gradient = path.fillColor.gradient;
*
* // This function is called each frame of the animation:
* function onFrame(event) {
* var blackStop = gradient.stops[2];
* // Animate the offset between 0.7 and 0.9:
* blackStop.offset = Math.sin(event.time * 5) * 0.1 + 0.8;
*
* // Animate the offset between 0.2 and 0.4
* var redStop = gradient.stops[1];
* redStop.offset = Math.sin(event.time * 3) * 0.1 + 0.3;
* }
*/
getOffset: function () {
return this._offset;
},
setOffset: function (offset) {
this._offset = offset;
this._changed();
},
/**
* @private
* @bean
* @deprecated use {@link #offset} instead.
*/
getRampPoint: '#getOffset',
setRampPoint: '#setOffset',
/**
* The color of the gradient stop.
*
* @bean
* @type Color
*
* @example {@paperscript height=300}
* // Animating a gradient's ramp points:
*
* // Create a circle shaped path at the center of the view,
* // using 40% of the height of the view as its radius
* // and fill it with a radial gradient color:
* var path = new Path.Circle({
* center: view.center,
* radius: view.bounds.height * 0.4
* });
*
* path.fillColor = {
* gradient: {
* stops: [['yellow', 0.05], ['red', 0.2], ['black', 1]],
* radial: true
* },
* origin: path.position,
* destination: path.bounds.rightCenter
* };
*
* var redStop = path.fillColor.gradient.stops[1];
* var blackStop = path.fillColor.gradient.stops[2];
*
* // This function is called each frame of the animation:
* function onFrame(event) {
* // Animate the offset between 0.7 and 0.9:
* blackStop.offset = Math.sin(event.time * 5) * 0.1 + 0.8;
*
* // Animate the offset between 0.2 and 0.4
* redStop.offset = Math.sin(event.time * 3) * 0.1 + 0.3;
* }
*/
getColor: function () {
return this._color;
},
setColor: function (/* color */) {
// Clear old color owner before setting new one:
Color._setOwner(this._color, null);
this._color = Color._setOwner(Color.read(arguments, 0), this, 'setColor');
this._changed();
},
equals: function (stop) {
return (
stop === this ||
(stop && this._class === stop._class && this._color.equals(stop._color) && this._offset == stop._offset) ||
false
);
},
}
);
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