class cube {
  float x, y, z;
  float Boff, Goff, Roff;
  float a=random(-PI, PI);
  float d=random(500);
  //color c;

  float redValue=255;
  float greenValue=0;
  float blueValue=0;

  cube() {
    //this.generate(this.c);
    this.generate();
  }

  //void generate(color c) {
    void generate() {
  /*  this.Boff = random(255);
    this.Goff = random(255);
    this.Roff = random(255);
    */
    //this.c=c;
    this.x = random(width);
    this.y=random(height);
    this.z=random(150);
  }

  void draw() {
    pushMatrix();
    fill(0,0,0,0);
   //stroke(noise(Roff)*100+150, noise(Goff)*100+152, noise(Boff)*200+50);
    stroke(redValue,greenValue,blueValue);
    translate(this.x, this.y, -(this.z)- sin(this.a)*500);
    rotateY(frameCount/20.0);
    rotateX(frameCount/20.0);
    box(d);
    popMatrix();
  }

  void update() {
    this.a=this.a+0.5;
    this.Boff = this.Boff + 0.1;
    this.Goff = this.Goff + 0.1;
    this.Roff = this.Roff + 0.1;
    if ( greenValue<255 && redValue==255 && blueValue==0) {
   greenValue++;
   }

  //go from yellow to pure green
  if (greenValue == 255 && redValue>0) {
    //redToGreen = false;
    redValue--;
  }

  //go from green to cyan/bluish-green
  if (redValue==0 && greenValue==255 && blueValue<255) {

    blueValue++;
  }

  //go from bluish-green to blue
  if (blueValue==255 && greenValue>0) {
    greenValue--;
  }
  // go from blue to violet
  if (redValue < 255 && greenValue==0 && blueValue==255) {
    redValue++;
  }
  //go from violet to red
  if (redValue == 255 && blueValue>0) {
    blueValue--;
  }
  }
}