git.r.bdr.sh - rbdr/lissajous/blob - 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 / 100) % internals.kPeriod;
  31
  32     for (const curve of this.curves) {
  33       curve.position.x = this._getPosition(curve.amplitude.a, curve.frequency.a, this.time, 0);
  34       curve.position.y = this._getPosition(curve.amplitude.b, curve.frequency.b, this.time, 0);
  35       curve.position.z = this._getPosition(curve.amplitude.c, curve.frequency.c, this.time, 0);
  36     }
  37   }
  38
  39   _getPosition(amplitude, frequency, time, phaseShift) {
  40
  41     return amplitude * Math.sin(frequency * time + phaseShift);
  42   }
  43 };