// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 4-6: Ellipse with variables
  
  // Declare and initialize your variables!
  float r = 100;
  float g = 150;
  float b = 200;
  float a = 200;
    
  float diam = 20;
  float x = 100;
  float y = 100;
    
  void setup() {
    size(200,200);
    background(255);
    smooth();    
  }
  
  void draw() {
    // Use those variables to draw an ellipse
    stroke(0);
    fill(r,g,b,a);  // (Remember, the fourth argument for a color is transparency.
    ellipse(x,y,diam,diam);  
  }