void setup()
{
  size(200, 200);
  noLoop();
  noStroke();
}


int y=100;


void draw()
{
  background(0);
  fill(255-y);
  y=y+1;
  if (y>260)
  {
    y=-40;
  }
  ellipse(20, y, 10, 10);
  ellipse(160, y-45, 10, 10);
  ellipse(70, y-60, 10, 10);
  ellipse(120, y+40, 10, 10);
}


  

void mousePressed()
{
  loop();
}