105 lines
2.3 KiB
JavaScript
105 lines
2.3 KiB
JavaScript
import {compose, Property} from '@avocado/core';
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import {Trait} from '@avocado/entity';
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import {Ticker} from '@avocado/timing';
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const decorate = compose(
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);
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export class Emitter extends decorate(Trait) {
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initialize() {
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this.emitters = {};
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this.ticker = new Ticker(1 / 10);
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this.ticker.on('tick', (elapsed) => {
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this.updateFrequency();
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for (const key in this.emitters) {
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const emitter = this.emitters[key];
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emitter.tick(elapsed);
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}
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});
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}
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static addEmitter(emitter) {
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if (!this._emitters) {
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this._emitters = [];
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}
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this._emitters.push(emitter);
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}
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static particleCount() {
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let particleCount = 0;
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if (!this._emitters) {
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return particleCount;
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}
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for (let i = 0; i < this._emitters.length; i++) {
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const emitter = this._emitters[i];
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particleCount += emitter.particleCount;
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}
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return particleCount;
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}
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static removeEmitter(emitter) {
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const index = this._emitters.indexOf(emitter);
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if (-1 === index) {
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return;
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}
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this._emitters.splice(index, 1);
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}
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updateFrequency() {
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const particleCount = this.constructor.particleCount();
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const updatesPerSecond = Math.max(15, (60 - (particleCount / 10)));
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this.ticker.frequency = 1 / updatesPerSecond;
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}
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hooks() {
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return {
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afterDestructionTickers: () => {
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return (elapsed) => {
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for (const key in this.emitters) {
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const emitter = this.emitters[key];
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this.ticker.tick(elapsed);
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if (!emitter.hasParticles()) {
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emitter.destroy();
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delete this.emitters[key];
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}
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}
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return 0 === Object.keys(this.emitters).length;
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};
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},
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}
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}
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methods() {
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return {
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addEmitter: (key, emitter) => {
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this.emitters[key] = emitter;
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this.constructor.addEmitter(emitter);
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},
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addEmitterRenderer: (key, renderer) => {
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if (!this.emitters[key]) {
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return;
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}
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this.emitters[key].addRenderer(renderer);
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},
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emitParticle: (key, ...args) => {
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if (!this.emitters[key]) {
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return;
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}
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this.emitters[key].emit(...args);
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},
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}
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}
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renderTick(elapsed) {
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this.ticker.tick(elapsed);
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}
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}
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