package com.knutejohnson.demos;

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class Shapes2 extends Canvas implements Runnable {
    final Random r = new Random(new Date().getTime());
    private volatile Thread thread;

    public void start() {
        thread = new Thread(this);
        thread.start();
    }

    public void stop() {
        thread.interrupt();
    }

    public void run() {
        while (!Thread.interrupted())
            repaint();
    }

    public void update(Graphics g) {
        paint(g);
    }

    public void paint(Graphics g) {
        int x,y,w,h;
        int width = getWidth();
        int height = getHeight();

        x = r.nextInt(width * 2) - width;
        y = r.nextInt(height * 2) - height;
        w = r.nextInt(width / 2);
        h = r.nextInt(height / 2);
        g.setColor(new Color(r.nextInt(16777215)));
        g.fillOval(x,y,w,h);

        x = r.nextInt(width * 2) - width;
        y = r.nextInt(height * 2) - height;
        w = r.nextInt(width / 2);
        h = r.nextInt(height / 2);
        g.setColor(new Color(r.nextInt(16777215)));
        g.fillRect(x,y,w,h);
    }

    public static void main(String[] args) {
        Frame f = new Frame("Shapes2");
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent we) {
                System.exit(0);
            }
        });
        Shapes2 shapes = new Shapes2();
        shapes.setPreferredSize(new Dimension(640,480));
        f.add(shapes,BorderLayout.CENTER);
        f.pack();
        f.setVisible(true);
        shapes.start();
    }
}