float px[] = new float[300];
  float py[] = new float[300];
  float pr[] = new float[360];
  void setup(){
    size(300,300);
  }
  void draw(){
  }
  void mousePressed(){
    for(int i=0; i<mouseY; i++){
      px[i] = random(width);
      py[i] = random(height);
      pr[i] = random(360);
    }
  }
  void mouseDragged(){
    background(255);
    for(int i=0; i<mouseY; i++){
      pushMatrix();
      rectMode(CENTER);
      translate(px[i],py[i]);
      rotate(radians(pr[i] + mouseX));
      rect(0,0,5,500);
      popMatrix();
    }
  }