// Chord Test 3 by John Clavin -- Sept 2015

var envelope, numOfOsc;
var beatCount, chordCount, chordNumber;
var fadeFlag, fadeCount;
var jcOscs = [];

var noteArray = [53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,
		65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75,
		76, 77, 78, 79,	80, 81, 82, 83, 84, 85, 86];
					
function setup() {
  var ctCanvas = createCanvas(800, 400);
  ctCanvas.parent('ctContainer');
  frameRate(30);
  background(180);
  noStroke();
  numOfOsc = 4;
  fadeFlag = false;
  fadeCount = 0;
  chordCount = 0;
  chordNumber = round(random(5, 13));
  beatCount = round(random(0, 1)); 
  for (var i = 0; i < numOfOsc; i++) {
    jcOscs[i] = new jcOsc();
  }
}

function draw() {
  if (frameCount % 30 == 15) {
    if(beatCount == 0) {
      createChord(round(random(1, 4)));
      chordCount++;
      if(chordCount >= chordNumber) {
        beatCount = 6;
	chordCount = 0;
	chordNumber = round(random(5, 13));
	fadeFlag = true;
      } else if(random(100) > 50) {
        beatCount = 0;
      } else {
        beatCount = 1;
      }
    } else {
      beatCount--;
    }
  }
  if(fadeFlag) {
    fadeCount++;
    if(fadeCount > 60 && fadeCount < 130 ) {
      background(180, 12);
    } else if(fadeCount > 125) {
      background(180);
      fadeFlag = false;
      fadeCount = 0;
    }	
  }
}

function jcOsc() {
  this.osc = new p5.Oscillator();
  this.osc.setType( 'sine' );
  this.osc.amp(0.0);
  this.envelope = new p5.Env(0.015, 0.16, 0.20, 0.12, 3.6, 0.00);
  this.osc.start();
}

jcOsc.prototype.jamOn = function(xnote) {
  this.note = xnote;
  this.freqValue = midiToFreq(this.note);
  this.osc.freq(this.freqValue);
  this.envelope.play(this.osc);	
}

jcOsc.prototype.display = function(noteDisplayIndex) {
  this.note = noteDisplayIndex;
  fill(240, 0, 0);
  this.x = map(this.note, 0, 23, 0, width);
  rect(this.x, 150, 10, 250);
}

function createChord(noteIndex) {
  background(180);

  var noteIndex;
  var midiValue = noteArray[noteIndex];
  jcOscs[0].jamOn(midiValue);
  jcOscs[0].display(noteIndex);
    
  noteIndex = noteIndex + round(random(3, 6));
  midiValue = noteArray[noteIndex];
  jcOscs[1].jamOn(midiValue);
  jcOscs[1].display(noteIndex);
    
  noteIndex = noteIndex + round(random(1, 6));
  var midiValue = noteArray[noteIndex];
  jcOscs[2].jamOn(midiValue);
  jcOscs[2].display(noteIndex);
    
  noteIndex = noteIndex + round(random(1, 6));
  midiValue = noteArray[noteIndex];
  jcOscs[3].jamOn(midiValue);
  jcOscs[3].display(noteIndex);
}