// RectToy1
//
// A simple animation applet.  This version plays by the rules, drawing
// only from within the paint() routine.  All the thread routine does is
// repeatedly ask for repaints.  Because of the extra overhead and because
// multiple repaint requests can get combined into one call to paint(),
// this version runs fairly slowly.
//
// Copyright (C)1996,1998 by Jef Poskanzer <jef@mail.acme.com>. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.

import java.applet.*;
import java.awt.*;
import java.util.Random;

public class RectToy1 extends Applet implements Runnable
    {

    // Applet info.
    public String getAppletInfo()
	{
	return getClass().getName() +
" - Copyright (C) 1996 by Jef Poskanzer <jef@mail.acme.com>.  All rights reserved.";
	}

    // Called when the applet is first created.
    public void init()
	{
	Acme.GuiUtils.handleBgcolor( this );
	}

    Thread thread = null;
    Random random = new Random();
    int loops = 0;

    // Called when the applet should start itself.
    public void start()
	{
	if ( thread == null )
	    {
	    // Start the thread.
	    thread = new Thread(this);
	    thread.start();
	    }
	}

    // Called when the applet should stop itself.
    public void stop()
	{
        if ( thread != null )
            {
	    // Stop the thread.
	    thread.stop();
            thread = null;
            }
	}

    // This is the part of Runnable that we implement - the routine that
    // gets called when the thread is started.
    public void run()
	{
	Thread me = Thread.currentThread();
	me.setPriority( Thread.MIN_PRIORITY );
	while ( thread == me )
	    {
	    repaint();
	    // Occasional sleeps to work around an X11 Netscape bug.
	    ++loops;
	    if ( loops % 10 == 0 )
		{
		try
		    {
		    Thread.sleep( 10 );
		    }
		catch ( InterruptedException e ) {}
		}
	    }
	}

    // The default update() clears the background and then calls paint().
    // This one doesn't clear the background.
    public void update( Graphics graphics )
	{
	paint( graphics );
	}

    // Called when the applet should paint itself.
    public void paint( Graphics graphics )
	{
	Dimension d = size();
	// Dimension d = getSize();
	int w = Math.abs( random.nextInt() ) % ( d.width / 2 );
	int h = Math.abs( random.nextInt() ) % ( d.height / 2 );
	int x = Math.abs( random.nextInt() ) % ( d.width - w );
	int y = Math.abs( random.nextInt() ) % ( d.height - h );
	int r = Math.abs( random.nextInt() ) % 256;
	int g = Math.abs( random.nextInt() ) % 256;
	int b = Math.abs( random.nextInt() ) % 256;
	graphics.setColor( new Color( r, g, b ) );
	graphics.fillRect( x, y, w, h );
	}

    }