import processing.core.*; 
import java.applet.*; 
import java.awt.*; 
import java.awt.image.*; 
import java.awt.event.*; 
import java.io.*; 
import java.net.*; 
import java.text.*; 
import java.util.*; 
import java.util.zip.*; 

public class SimpleEllipse extends PApplet 
{     
     int x = 0;
     int y = 0;
     int xDirection = 1;
     int yDirection = 1;
            
     public void setup()
      {
         size(500,500);
      }
            
      public void draw()
      {
         background(255);
              
       	if (x > width || x < 0)
       	{
          xDirection = xDirection * -1;
       	}
       	x += xDirection;
              
      	if (y > height || y < 0)
      	{
         yDirection = yDirection * -1;
      	}
      	y += yDirection;
              
     	 ellipseMode(CENTER);
	 ellipse(x,y,50,50);
	}

      static public void main(String args[]) {   PApplet.main(new String[] { "sketch_061103a" });}
}