// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 14-11: A growing rectangle, using scale()
  
  float r = 0.0;
  
  void setup() {
    size(200,200);
  }
  
  void draw() {
    background(255);
    // Translate to center of window
    translate(width/2,height/2);
    
    // scale() increases the dimensions of an object relative to the origin by a percentage (1.0 = 100%). 
    // Notice how in this example the scaling effect causes the outline of the shape to become thicker.
    scale(r); 
    
    // Display a rectangle in the middle of the screen
    stroke(0);
    fill(175);
    rectMode(CENTER);
    rect(0,0,10,10);
    
    // Increase the scale variable
    r += 0.02;
    
    // Retstart r
    if (r > 20) {
      r = 0;
    }
    
    
  }