// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 4-7: Filling variables with random values
  
  float r;
  float g;
  float b;
  float a;
  
  float diam;
  float x;
  float y;
  
  void setup() {
    size(200,200);
    background(255);
    smooth();    
  }
  
  void draw() {
    // Each time through draw(), new random numbers are picked for a new ellipse.
    r = random(255);
    g = random(255);
    b = random(255);
    a = random(255);
    diam = random(20);
    x = random(width);
    y = random(height);
    
    // Use values to draw an ellipse
    noStroke();
    fill(r,g,b,a);
    ellipse(x,y,diam,diam);
  }