// applet to draw an orbit and planet on orbit
import java.awt.*;
import javax.swing.*;
import java.math.*;

public class Applet7 extends JApplet {
int point1,point2;
double angle=1.7;
int x1=250; int y1=250; int xos=20; int yos=20; int R=220; int step=22;
boolean clockwise = true; 
public void paint(Graphics g) 
{
g.setColor(Color.white);
g.fillRect(0,0,500,500);
g.setColor(Color.red); 
g.drawOval(250-R,250-R,R*2,R*2);
point1=(int)(R * Math.cos(angle) + x1);
point2=(int)(y1-R * Math.sin(angle)); // changed from 1st version


g.fillOval(point1-(xos/2),point2-(yos/2),xos,yos);
//g.fillOval(point1,point2,xos,yos);
if(clockwise) angle -= Math.PI/step;
else angle += Math.PI/step; // changed from 1st version 
try{Thread.sleep(300);} catch(Exception e){} 
repaint();

}
}