This example is for Processing 2+. If you have a previous version, use the examples included with your software. If you see any errors or have suggestions, please let us know.

Scale by Denis Grutze.

Paramenters for the scale() function are values specified as decimal percentages. For example, the method call scale(2.0) will increase the dimension of the shape by 200 percent. Objects always scale from the origin.

 
float a = 0.0;
float s = 0.0;

void setup() {
  size(640, 360);
  noStroke();
  rectMode(CENTER);
  frameRate(30);
}

void draw() {
  
  background(102);
  
  a = a + 0.04;
  s = cos(a)*2;
  
  translate(width/2, height/2);
  scale(s); 
  fill(51);
  rect(0, 0, 50, 50); 
  
  translate(75, 0);
  fill(255);
  scale(s);
  rect(0, 0, 50, 50);       
}