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[rbdr/lissajous] / lib / systems / lissajous_position_updater.js
1 import { System } from '@serpentity/serpentity';
2 import LissajousCurve from '../nodes/lissajous_curve';
3
4 const internals = {
5 kAmplitude: 1,
6 kPeriod: Math.PI * 12000000
7 };
8
9 export default class WebGLRenderer extends System {
10
11 constructor() {
12
13 super();
14 }
15
16 added(engine){
17
18 this.curves = engine.getNodes(LissajousCurve);
19 this.time = 0;
20 }
21
22 removed(){
23
24 delete this.curves;
25 delete this.time;
26 }
27
28 update(dt){
29
30 this.time = (this.time + dt / 500) % internals.kPeriod;
31
32 for (const curve of this.curves) {
33 curve.position.x = this._getPosition(curve.amplitude.a, curve.frequency.a, this.time, curve.phase.a);
34 curve.position.y = this._getPosition(curve.amplitude.b, curve.frequency.b, this.time, curve.phase.b);
35 curve.position.z = this._getPosition(curve.amplitude.c, curve.frequency.c, this.time, curve.phase.c);
36 }
37 }
38
39 _getPosition(amplitude, frequency, time, phaseShift) {
40
41 return amplitude * Math.sin(frequency * time + phaseShift);
42 }
43 };