lib/systems/lissajous_position_updater.js


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import { System } from '@serpentity/serpentity';
import LissajousCurve from '../nodes/lissajous_curve';

const internals = {
  kAmplitude: 0.8,
  kPeriod: Math.PI * 12000000
};

export default class WebGLRenderer extends System {

  constructor() {

    super();
  }

  added(engine){

    this.curves = engine.getNodes(LissajousCurve);
    this.time = 0;
  }

  removed(){

    this.curves = undefined;
    this.time = undefined;
  }

  update(dt){

    this.time = (this.time + dt / 100) % internals.kPeriod;

    for (const curve of this.curves) {
      curve.position.x = this._getPosition(internals.kAmplitude, curve.frequency.a, this.time, 0);
      curve.position.y = this._getPosition(internals.kAmplitude, curve.frequency.b, this.time, 0);
      curve.position.z = this._getPosition(internals.kAmplitude, curve.frequency.c, this.time, 0);
    }
    console.log('UP');
  }

  _getPosition(amplitude, frequency, time, phaseShift) {

    return amplitude * Math.sin(frequency * time + phaseShift);
  }
};