// Animated solar system

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class SolarSystem extends Applet implements ActionListener {
    int sleepTime = 100,
        pauseTime = 2000,
        appletXSize = 900,
        appletYSize = 600;
    Button showOrbits = new Button("Show/Remove orbit traces");

    HeavenlyBody God = new HeavenlyBody(appletXSize/2, appletYSize/2, 0),
                 Sun = new HeavenlyBody(God, 50, 0.0, 0.0, Color.yellow),
                 Mercury = new HeavenlyBody(Sun, 5, 80.0, 0.5, Color.darkGray),
                 Venus = new HeavenlyBody(Sun, 7, 110.0, 0.4, Color.green),
                 Earth = new HeavenlyBody(Sun, 8, 150.0, 0.3, Color.blue),
                 Moon = new HeavenlyBody(Earth, 3, 25.0, 0.8, Color.black),
                 Mars = new HeavenlyBody(Sun, 8, 190.0, 0.24, Color.red),
                 Jupiter = new HeavenlyBody(Sun, 24, 240.0, 0.12, Color.pink),
                 JMoon1 = new HeavenlyBody(Jupiter, 4, 34.0, 0.7, Color.black),
                 JMoon2 = new HeavenlyBody(Jupiter, 5, 36.0, 0.2, Color.black),
                 JMoon2Moon = new HeavenlyBody(JMoon2, 3, 9.0, 0.1, Color.red),
                 Saturn = new Saturn(Sun, 21, 280.0, 0.08, Color.orange),
                 Uranus = new HeavenlyBody(Sun, 10, 320.0, 0.04, Color.green),
                 Neptune = new HeavenlyBody(Sun, 10, 350.0, 0.02, Color.blue),
                 Pluto = new HeavenlyBody(Sun, 6, 370.0, 0.01, Color.gray);

    public void init() {
        add(showOrbits); // add Show/Remove orbit traces button
        showOrbits.addActionListener(this);
    }

    public void paint(Graphics g) {
        Sun.move();
        Sun.draw(g);
/*
        try {
            Thread.sleep(sleepTime);
        }
        catch (InterruptedException e) {
            showStatus(e.toString());
        }
*/
        repaint(sleepTime);
    }

    public void actionPerformed(ActionEvent e) {
        HeavenlyBody.showOrbit = !HeavenlyBody.showOrbit;
    }
}