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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 { ref } from '~/globals';
import { Base } from '~/straps';
import { Emitter } from '~/core/Emitter';
/**
* @name Tween
*
* @class Allows tweening `Object` properties between two states for a given
* duration. To tween properties on Paper.js {@link Item} instances,
* {@link Item#tween(from, to, options)} can be used, which returns created
* tween instance.
*
* @see Item#tween(from, to, options)
* @see Item#tween(to, options)
* @see Item#tween(options)
* @see Item#tweenTo(to, options)
* @see Item#tweenFrom(from, options)
*/
export const Tween = Base.extend(
Emitter,
/** @lends Tween# */ {
_class: 'Tween',
statics: {
easings: new Base({
// no easing, no acceleration
linear: function (t) {
return t;
},
// accelerating from zero velocity
easeInQuad: function (t) {
return t * t;
},
// decelerating to zero velocity
easeOutQuad: function (t) {
return t * (2 - t);
},
// acceleration until halfway, then deceleration
easeInOutQuad: function (t) {
return t < 0.5 ? 2 * t * t : -1 + 2 * (2 - t) * t;
},
// accelerating from zero velocity
easeInCubic: function (t) {
return t * t * t;
},
// decelerating to zero velocity
easeOutCubic: function (t) {
return --t * t * t + 1;
},
// acceleration until halfway, then deceleration
easeInOutCubic: function (t) {
return t < 0.5 ? 4 * t * t * t : (t - 1) * (2 * t - 2) * (2 * t - 2) + 1;
},
// accelerating from zero velocity
easeInQuart: function (t) {
return t * t * t * t;
},
// decelerating to zero velocity
easeOutQuart: function (t) {
return 1 - --t * t * t * t;
},
// acceleration until halfway, then deceleration
easeInOutQuart: function (t) {
return t < 0.5 ? 8 * t * t * t * t : 1 - 8 * --t * t * t * t;
},
// accelerating from zero velocity
easeInQuint: function (t) {
return t * t * t * t * t;
},
// decelerating to zero velocity
easeOutQuint: function (t) {
return 1 + --t * t * t * t * t;
},
// acceleration until halfway, then deceleration
easeInOutQuint: function (t) {
return t < 0.5 ? 16 * t * t * t * t * t : 1 + 16 * --t * t * t * t * t;
},
}),
},
/**
* Creates a new tween.
*
* @param {Object} object the object to tween the properties on
* @param {Object} from the state at the start of the tweening
* @param {Object} to the state at the end of the tweening
* @param {Number} duration the duration of the tweening
* @param {String|Function} [easing='linear'] the type of the easing
* function or the easing function
* @param {Boolean} [start=true] whether to start tweening automatically
* @return {Tween} the newly created tween
*/
initialize: function Tween(object, from, to, duration, easing, start) {
this.object = object;
var type = typeof easing;
var isFunction = type === 'function';
this.type = isFunction ? type : type === 'string' ? easing : 'linear';
// @ts-expect-error = 'easings' does not exist on type
this.easing = isFunction ? easing : Tween.easings[this.type];
this.duration = duration;
this.running = false;
this._then = null;
this._startTime = null;
var state = from || to;
this._keys = state ? Object.keys(state) : [];
this._parsedKeys = this._parseKeys(this._keys);
this._from = state && this._getState(from);
this._to = state && this._getState(to);
if (start !== false) {
this.start();
}
},
/**
* Set a function that will be executed when the tween completes.
* @param {Function} function the function to execute when the tween
* completes
* @return {Tween}
*
* @example {@paperscript}
* // Tweens chaining:
* var circle = new Path.Circle({
* center: view.center,
* radius: 40,
* fillColor: 'blue'
* });
* // Tween color from blue to red.
* var tween = circle.tweenTo({ fillColor: 'red' }, 2000);
* // When the first tween completes...
* tween.then(function() {
* // ...tween color back to blue.
* circle.tweenTo({ fillColor: 'blue' }, 2000);
* });
*/
then: function (then) {
// TODO: This only supports one callback for `then()`. Figure out how
// to handle multiple calls to then in an decent way, without relying
// on Promises (or should we?).
this._then = then;
return this;
},
/**
* Start tweening.
* @return {Tween}
*
* @example {@paperscript}
* // Manually start tweening.
* var circle = new Path.Circle({
* center: view.center,
* radius: 40,
* fillColor: 'blue'
* });
* var tween = circle.tweenTo(
* { fillColor: 'red' },
* { duration: 2000, start: false }
* );
* tween.start();
*/
start: function () {
this._startTime = null;
this.running = true;
return this;
},
/**
* Stop tweening.
* @return {Tween}
*
* @example {@paperscript}
* // Stop a tween before it completes.
* var circle = new Path.Circle({
* center: view.center,
* radius: 40,
* fillColor: 'blue'
* });
* // Start tweening from blue to red for 2 seconds.
* var tween = circle.tweenTo({ fillColor: 'red' }, 2000);
* // After 1 second...
* setTimeout(function(){
* // ...stop tweening.
* tween.stop();
* }, 1000);
*/
stop: function () {
this.running = false;
return this;
},
// DOCS: Document Tween#update(progress)
update: function (progress) {
if (this.running) {
if (progress >= 1) {
// Always finish the animation.
progress = 1;
this.running = false;
}
var factor = this.easing(progress),
keys = this._keys,
getValue = function (value) {
return typeof value === 'function' ? value(factor, progress) : value;
};
for (var i = 0, l = keys && keys.length; i < l; i++) {
var key = keys[i],
from = getValue(this._from[key]),
to = getValue(this._to[key]),
// Some paper objects have math functions (e.g.: Point,
// Color) which can directly be used to do the tweening.
value =
from && to && from.__add && to.__add
? to.__subtract(from).__multiply(factor).__add(from)
: (to - from) * factor + from;
this._setProperty(this._parsedKeys[key], value);
}
// TODO: Set `progress` and `factor` on Tween object also, so they
// can be used witout events.
if (this.responds('update')) {
this.emit(
'update',
new Base({
progress: progress,
factor: factor,
})
);
}
if (!this.running && this._then) {
// TODO: Look into what should be returned.
this._then(this.object);
}
}
return this;
},
/**
* {@grouptitle Event Handlers}
*
* The function to be called when the tween is updated. It receives an
* object as its sole argument, containing the current progress of the
* tweening and the factor calculated by the easing function.
*
* @name Tween#onUpdate
* @property
* @type ?Function
*
* @example {@paperscript}
* // Display tween progression values:
* var circle = new Path.Circle({
* center: view.center,
* radius: 40,
* fillColor: 'blue'
* });
* var tween = circle.tweenTo(
* { fillColor: 'red' },
* {
* duration: 2000,
* easing: 'easeInCubic'
* }
* );
* var progressText = new PointText(view.center + [60, -10]);
* var factorText = new PointText(view.center + [60, 10]);
*
* // Install event using onUpdate() property:
* tween.onUpdate = function(event) {
* progressText.content = 'progress: ' + event.progress.toFixed(2);
* };
*
* // Install event using on('update') method:
* tween.on('update', function(event) {
* factorText.content = 'factor: ' + event.factor.toFixed(2);
* });
*/
_events: {
onUpdate: {},
},
_handleFrame: function (time) {
var startTime = this._startTime,
progress = startTime ? (time - startTime) / this.duration : 0;
if (!startTime) {
this._startTime = time;
}
this.update(progress);
},
_getState: function (state) {
var keys = this._keys,
result = {};
for (var i = 0, l = keys.length; i < l; i++) {
var key = keys[i],
path = this._parsedKeys[key],
current = this._getProperty(path),
value;
if (state) {
var resolved = this._resolveValue(current, state[key]);
// Temporarily set the resolved value, so we can retrieve the
// coerced value from paper's internal magic.
this._setProperty(path, resolved);
value = this._getProperty(path);
// Clone the value if possible to prevent future changes.
value = value && value.clone ? value.clone() : value;
this._setProperty(path, current);
} else {
// We want to get the current state at the time of the call, so
// we have to clone if possible to prevent future changes.
value = current && current.clone ? current.clone() : current;
}
result[key] = value;
}
return result;
},
_resolveValue: function (current, value) {
if (value) {
if (Array.isArray(value) && value.length === 2) {
var operator = value[0];
return operator &&
operator.match &&
// We're (unnecessarily) escaping '*/' here to not confuse
// the ol' JSDoc parser...
operator.match(/^[+\-\*\/]=/)
? this._calculate(current, operator[0], value[1])
: value;
} else if (typeof value === 'string') {
var match = value.match(/^[+\-*/]=(.*)/);
if (match) {
var parsed = JSON.parse(match[1].replace(/(['"])?([a-zA-Z0-9_]+)(['"])?:/g, '"$2": '));
return this._calculate(current, value[0], parsed);
}
}
}
return value;
},
_calculate: function (left, operator, right) {
return ref.paper.PaperScript.calculateBinary(left, operator, right);
},
_parseKeys: function (keys) {
var parsed = {};
for (var i = 0, l = keys.length; i < l; i++) {
var key = keys[i],
path = key
// Convert from JS property access notation to JSON pointer:
.replace(/\.([^.]*)/g, '/$1')
// Expand array property access notation ([])
.replace(/\[['"]?([^'"\]]*)['"]?\]/g, '/$1');
parsed[key] = path.split('/');
}
return parsed;
},
_getProperty: function (path, offset) {
var obj = this.object;
for (var i = 0, l = path.length - (offset || 0); i < l && obj; i++) {
obj = obj[path[i]];
}
return obj;
},
_setProperty: function (path, value) {
var dest = this._getProperty(path, 1);
if (dest) {
dest[path[path.length - 1]] = value;
}
},
}
);
ref.Tween = Tween;
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