Chapter 14: Example 14-11: A Growing Rectangle, using scale()

// 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;
  }
  
  
}