Gameling - OpenProcessing

mySketch
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//Pierre MARZIN .7/03/2019
var instruments;
var nbinstruments, pentanotes;
var center, garadius, tempo;
var soundContext=false;
function setup() {
  createCanvas(windowWidth, windowHeight);
  pentanotes=[
    36, 39, 41, 42, 43, 46, // 24
    48, 51, 53, 54, 55, 58, // 30
    60, 63, 65, 66, 67, 70, // 36   
    72, 75, 77, 78, 79, 82, // 42
    84, 87, 89, 90, 91, 94, // 48
    96, 99, 101, 102, 103, 106];  
  colorMode(HSB, 360, 255, 255, 255);
  textAlign(CENTER, CENTER);
  center=createVector(windowWidth/2, windowHeight/2);
  garadius=windowHeight*.45;
  tempo=random(.01, .02);
}
​
function draw() {
  background(0, 0, 200);
  if (soundContext) {
    noStroke();
    if (random(1)>.7&&(2*frameCount*tempo)%PI<.1) {
      if (millis()%120000<60000) {
        if (instruments.length<8 && random(1)>.75)instruments.push(new Instrument(random(1)>.5?new p5.SinOsc():new p5.TriOsc(), new p5.Envelope(), random(.1), random(1), random(1), random(1)));
        else {
          var nk=int(random(instruments.length));
          instruments.splice(nk, 1, new Instrument(random(1)>.5?new p5.SinOsc():new p5.TriOsc(), new p5.Envelope(), random(.1), random(1), random(1), random(1)));
        }
      }
      else{
        var nk=int(random(instruments.length));
        if (instruments.length>0 && random(1)>.75)instruments.splice(nk, 1);
        else {          
          instruments.splice(nk, 1, new Instrument(random(1)>.5?new p5.SinOsc():new p5.TriOsc(), new p5.Envelope(), random(.1), random(1), random(1), random(1)));
        }
      }
    }
    for (var j=0; j<instruments.length; j++) {
      var ins=instruments[j];
      for (var i=0; i<ins.keys.length; i++) {
        ins.keys[i].display();
        if (abs(ins.keys[i].angle+frameCount*tempo)%TWO_PI<.02)ins.keys[i].play();
      }
    }
  } else {
    textSize(128);
    text("Click!", windowWidth*.5, windowHeight*.5);
  }
  stroke(0);
  strokeWeight(.5);
  line(center.x, center.y, center.x+garadius*sin(-frameCount*tempo), center.y+garadius*cos(-frameCount*tempo));
}
function mouseClicked() {
  if (!soundContext) {
    soundContext=true;
    init();
  }
}
function init() {  
  instruments=[];
  nbinstruments=1;
  for (var i=0; i<nbinstruments; i++) {
    instruments.push(new Instrument(random(1)>.5?new p5.SinOsc():new p5.TriOsc(), new p5.Envelope(), random(.1), random(1), random(1), random(1)));
  }
}
function Key(freq, volume, instrument, angle, col, radius) {
  this.freq=freq;
  this.instrument=instrument;
  this.volume=volume;
  this.angle=angle;
  this.radius=radius;
  this.start=0;
  this.position=createVector(center.x+this.radius*garadius*sin(this.angle), center.y+this.radius*garadius*cos(this.angle));
  //console.log(this.position,this.radius);
  this.col=col;
}
Key.prototype.display=function() {
  push();
  fill(this.col);
  translate(this.position.x, this.position.y);
  if (millis()<this.start+1000*this.instrument.releaseTime) {
    noStroke();
    ellipse(0, 0, (.5+.5*sin(frameCount))*60*this.volume, (.5+.5*sin(frameCount))*60*this.volume);
  } else {
    //stroke(0);
    ellipse(0, 0, 60*this.volume, 60*this.volume);
  }
  pop();
}
Key.prototype.play=function() {
  this.instrument.envelope.mult(this.volume);
  this.instrument.osc.freq(this.freq);
  this.instrument.envelope.play(this.instrument.osc, 0, 0.1);
  this.start=millis();
}
function Instrument(osc, envelope, attackTime, decayTime, susRatio, releaseTime) {
  this.osc=osc;
  this.envelope=envelope;
  this.releaseTime=releaseTime;
  this.envelope.setADSR(attackTime, decayTime, susRatio, releaseTime);
  this.envelope.setRange(1, 0);
  this.osc.freq(0);
  this.osc.start();
  this.keys=[];
  this.nkeys=int(random(1, 12));
  var col=color(random(360), 255, 255, 200);
  var vol=random(.1, 1);
  this.note=int(random(pentanotes.length));
  var freq=midiToFreq(pentanotes[this.note]);  
  for (var k=0; k<this.nkeys; k++) {      
    if(random(1)>0)this.keys.push(new Key(freq, vol, this, k*TWO_PI/this.nkeys, col, map(this.note, 0, pentanotes.length, .1, 1)));
  }
}
​