void setup()
{
  size(400,400);
  smooth();
}

void draw() {
  background(255);
  drawCircle(width/2,height/2,width/2,3);
}

void drawCircle(float x, float y, float r, int d) {
  fill(0,16); stroke(0,128);
  ellipse(x,y,2*r,2*r);
  
  if(d > 0) {
    float rr = r / map(mouseX,0,width,2,4);
    float a = map(mouseY,0,height,0,PI);
    drawCircle(x+(r-rr)*cos(a),y+(r-rr)*sin(a),rr,d-1);
    drawCircle(x+(r-rr)*cos(a+PI/2),y+(r-rr)*sin(a+PI/2),rr,d-1);
    drawCircle(x+(r-rr)*cos(a+PI),y+(r-rr)*sin(a+PI),rr,d-1);
    drawCircle(x+(r-rr)*cos(a+3*PI/2),y+(r-rr)*sin(a+3*PI/2),rr,d-1);
  }
}

// START NO NOTES
// code used to capture screenshots
void keyReleased() {
  if(key == '`' && !online) save("sketch.png");
}