// Daniel Shiffman

// http://natureofcode.com

​

// Simple Recursion

​

function setup() {

  createCanvas(640,360);  

}

​

function draw() {

  background(51);

  drawCircle(width/2,height/2,400); 

  noLoop();

}

​

// Recursive function

function drawCircle(x,y,r) {

  stroke(255);

  noFill();

  ellipse(x, y, r, r);

  if(r > 2) {

    // Now we draw two more circles, one to the left

    // and one to the right

    drawCircle(x + r/2, y, r/2);

    drawCircle(x - r/2, y, r/2);

  }

}