processingjs recursive demo

// All Examples Written by Casey Reas and Ben Fry
// unless otherwise stated.
void setup() 
{
  size(200, 200);
  noStroke();
  smooth();
  noLoop();
}

void draw() 
{
  drawCircle(126, 170, 6);
}

void drawCircle(int x, int radius, int level) 
{                    
  float tt = 126 * level/4.0;
  fill(tt);
  ellipse(x, 100, radius*2, radius*2);      
  if(level > 1) {
    level = level - 1;
    drawCircle(x - radius/2, radius/2, level);
    drawCircle(x + radius/2, radius/2, level);
  }
}