void setup(){

  size(600,600);

}

void draw(){

  background(mouseY, mouseX, 25);

  float angle = 0;
  float x = mouseX;
  float y = mouseY;

  fill(map(x, 0, width, 0, 255), map(y, 0, height, 0, 255), 75);



  for(int i = 0; i < width; i += 10){
    for(int j = 0; j < height; j += 20){
       rotate(radians(angle));
       angle += 1;
        rect(i,j, 5,5);
  }
  }


}