int nr=0;
BodyPart root;

float rootAngleX=1500;
float rootAngleY=0;
float px, py;

void setup() { 
  size(500, 500);
  colorMode(RGB, 1);
  root = new BodyPart(0, 0);
 
} 
 
void loop() { 

//   println("frame");
  background(.5);
  if(mousePressed){
    rootAngleY -= (mouseX-px);
    rootAngleX -= (mouseY-py);
    //println(rootAngleX);
  }
  translate(width/2, height, -30);
  rotateX(rootAngleX/1000);
  rotateZ(rootAngleY/1000);
   
   root.grow();
   root._angPosX = 0;
  // println(root._width);

} 

void mousePressed() 
{ 
 px=mouseX;
 py=mouseY;
} 


class BodyPart {
  BodyPart[] children = new BodyPart[3];
  private int child_nr=0;
  private float _width = 0;
  private float _height = 0;
  private float _widthspeed;
  private float _heightspeed;
  private float _angleX;
  private float _angleY;
  public float _angPosX;
  private float newangle;
  private float nextchild;
 
  public BodyPart(float angleX, float angleY){
    _angleX = angleX;
    _angleY = angleY;
    _angPosX = 0;
    _widthspeed=.05;
    _heightspeed=.3;
    nextchild = 2;
  }

  public void grow(){
    if(keyPressed){
      _height+=_heightspeed;
      _width+=_widthspeed;
    
      //if(child_nr<3 && random(0,_width*10)/((child_nr+1)*(child_nr+1))>15){
      if(_width>nextchild && child_nr<3){
        nextchild+=random(1,10)*(child_nr+1);
        _heightspeed*=.6;
        newangle = random(.2,1);
        children[child_nr++] = new BodyPart(random(-newangle,newangle), random(-newangle,newangle));
      }
    }  
        
    paint();
     
    for(int i = 0;i<child_nr;i++){
       push();
       children[i].grow();  
       pop();
     }
  }
   
  private void paint(){
    rotateX(_angleX+sin(_angPosX+=.1/_width)/10);
    rotateY(_angleY+sin(_angPosX+=.1/_width)/10);
    translate(0,0,_height/2);
    fill(_width/20);
    
    box(_width,_width,_height);
    translate(0,0,_height/2);
  }
}