Tut­o­r­i­a­l 7

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/** @peep sketch */
size(400, 400);
squareRecursion(0, 0, width, height);
 
void squareRecursion(float x, float y, float w, float h) {
  // Draw a rectangle
  stroke(255);
  strokeWeight(0.1);
  rect(x, y, w, h);
 fill( random(255), random(255), random(255), random(255));
  // Test to see if we should recurse...
  if ((random(100) < 80) && (w > 30 || h > 30)) {
    // Set a border to go around sub-rectangles
    float bx = 3;
    float by = 3;
    // Calculatue the width and height of sub-rectangles
    w = (w - 3*bx) / 2;
    h = (h - 3*by) / 2;
    // Call the same function to draw the sub-rectangles
    squareRecursion(x + bx, y + by, w, h);
    squareRecursion(x + bx + w + bx, y + by, w, h);
    squareRecursion(x + bx, y + by + h + by, w, h);
    squareRecursion(x + bx + w + bx, y + by + h + by, w, h);
  }
}