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March 4, 2020 15:05
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AnimatedLineString
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| export class AnimatedLineString2 extends AnimatedWithChildren { | |
| constructor(line) { | |
| super(); | |
| this.coordinates = line.coordinates.map(coord => [...coord]); | |
| } | |
| // eslint-disable-next-line class-methods-use-this | |
| _onAnimationDone(animation, doneCB) { | |
| return new Proxy(animation, { | |
| get(obj, prop) { | |
| if (prop === 'start') { | |
| return function start(origDoneCB, ...args) { | |
| return obj.start((startParams, ...startArgs) => { | |
| doneCB(startParams); | |
| if (origDoneCB) { | |
| origDoneCB(startParams, ...startArgs); | |
| } | |
| }, ...args); | |
| }; | |
| } | |
| return obj[prop]; | |
| }, | |
| }); | |
| } | |
| _last(items) { | |
| return items.length > 0 ? items[items.length - 1] : null; | |
| } | |
| _setup(coordinates) { | |
| const last = this._last(this.coordinates); | |
| let i = this.coordinates.length; | |
| while (i < coordinates.length) { | |
| this.coordinates.push([...last]); | |
| i++; | |
| } | |
| } | |
| _cleanup(coordinates) { | |
| while (this.coordinates.length > coordinates.length) { | |
| this.coordinates.pop(); | |
| } | |
| super.__callListeners(this.__getValue()); | |
| } | |
| animate(type, config) { | |
| const {coordinates, ...rest} = config; | |
| const last = this._last(coordinates); | |
| this._setup(coordinates); | |
| this.value = new Animated.Value(0.0); | |
| this.newCoords = coordinates.map(coord => [...coord]); | |
| this.animation = Animated[type](this.value, {...rest, toValue: 1.0}); | |
| this.value.__addChild(this); | |
| return this.animation; | |
| } | |
| timing(config = {coordinates: DEFAULT_COORD}) { | |
| return this.animate('timing', config); | |
| } | |
| __getValue() { | |
| if (!this.animation) { | |
| return { | |
| type: 'LineString', | |
| coordinates: this.coordinates.map(coord => [coord[0], coord[1]]), | |
| }; | |
| } | |
| const newF = this.value.__getValue(); | |
| const origF = 1.0 - newF; | |
| return { | |
| type: 'LineString', | |
| coordinates: this.coordinates.map((coord, i) => { | |
| if (this.newCoords.length > i) { | |
| const newCoord = this.newCoords[i]; | |
| return [ | |
| coord[0] * origF + newCoord[0] * newF, | |
| coord[1] * origF + newCoord[1] * newF, | |
| ]; | |
| } | |
| return [coord[0], coord[1]]; | |
| }), | |
| }; | |
| } | |
| } |
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