class BeatParticle {
  Oscillator wave;
  
  int period;
  int curr = 0;
  
  float sz = 6;
  
  //float ampDelta = random(0.025, 0.025);
  float ampDelta = 0.025;
  
  int freqIndex;
  
  BeatParticle(int freqIndex) {
    float tmp = random(1);
    if (tmp > 0.66) {
      period = quantise * 8;
    } else if (tmp > 0.33) {
      period = quantise * 4;
    } else {
      period = quantise * 2;
    }
    this.freqIndex = freqIndex;
  }
  
  void update() {
    curr++;
    if (wave != null) {
      if (wave.amplitude() <= ampDelta) {
        out.removeSignal(wave);
        wave = null;
      } else {
        wave.setAmp(wave.amplitude() - ampDelta);
      }
    }
    if ((curr >= period) && (tick % quantise == 0)) {
      curr = 0;
      pulse();
    } else {
      if (tick % quantise == 0) {
        fill(0, 204, 255);
        noStroke();
        float posX = (width / (freqs.length + 0.0)) * (freqIndex + 0.5);
        ellipse(posX, sz * 2, sz, sz);
      }
    } 
  }
  
  void pulse() {
    float frequency = freqs[freqIndex];
    float maxAmp = 1.0 / (totalParticles + 0.0);
    if (wave != null) {
      wave.setAmp(0.0);
      out.removeSignal(wave);
      wave = null;
      //wave.setAmp(maxAmp);
    }// else {
      wave = new SineWave(frequency, maxAmp, 44100);
      wave.noPortamento();
      out.addSignal(wave);
    //}
    
    if (DRAW_COLUMNS) {
      fill(0, 204, 255, 64);
      noStroke();
      rect(freqIndex * (width / (freqs.length + 0.0)), 0, (width / (freqs.length + 0.0)), height);
      fill(255, 204, 0);
    }
    fill(0, 204, 255);
    ellipse(((width + 0.0) / freqs.length) * (freqIndex + 0.5), sz * 2, sz * 2, sz * 2);
  }
}