// SplineFun - a Java version of xsplinefun
//
// 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.*;

public class SplineFun 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()
	{
	setBackground( Color.black );
	}

    Thread thread = null;
    Graphics graphics = null;

    // 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;
            }
	}

    private static final int points = 5;

    // 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 );
	int i;
	Dimension size = size();
	// Dimension size = getSize();
	Acme.IntGlide[] xG = new Acme.IntGlide[points];
	Acme.IntGlide[] yG = new Acme.IntGlide[points];
	Acme.IntGlide rG = new Acme.IntGlide( 0, 255, 2, 0 );
	Acme.IntGlide gG = new Acme.IntGlide( 0, 255, 2, 0 );
	Acme.IntGlide bG = new Acme.IntGlide( 0, 255, 2, 0 );
	int r, g, b;
	for ( i = 0; i < points; ++i )
	    {
	    xG[i] = new Acme.IntGlide( 0, size.width - 1, 3 );
	    yG[i] = new Acme.IntGlide( 0, size.height - 1, 3 );
	    }
	int[] x = new int[points];
	int[] y = new int[points];
	int px, py, zx, zy, nx, ny;
	int loops = 0;

	while ( thread == me )
	    {
	    if ( graphics != null )
		{
		for ( i = 0; i < points; ++i )
		    {
		    x[i] = xG[i].next();
		    y[i] = yG[i].next();
		    }
		r = rG.next();
		g = gG.next();
		b = bG.next();
		graphics.setColor( new Color( r, g, b ) );
		px = ( x[0] + x[points-1] ) / 2;
		py = ( y[0] + y[points-1] ) / 2;
		zx = px;
		zy = py;
		for ( i = 0; i < points - 1; ++i )
		    {
		    nx = ( x[i+1] + x[i] ) / 2;
		    ny = ( y[i+1] + y[i] ) / 2;
		    Acme.GuiUtils.drawSpline( graphics, px, py, x[i], y[i], nx, ny );
		    px = nx;
		    py = ny;
		    }
		Acme.GuiUtils.drawSpline( graphics, px, py, x[points-1], y[points-1], zx, zy );
		}
	    // Occasional sleeps to work around an X11 Netscape bug.
	    ++loops;
	    if ( loops % 10 == 0 )
		{
		try
		    {
		    Thread.sleep( 10 );
		    }
		catch ( InterruptedException e ) {}
		}
	    }
	if ( graphics != null )
	    graphics.dispose();
	graphics = null;
	}

    // Called when the applet should paint itself.
    public void paint( Graphics graphics )
	{
	// Create a new graphics context for use by the run() routine.
	this.graphics = graphics.create();
	}

    // Main program, so we can run as an application too.
    public static void main( String[] args )
	{
	new Acme.MainFrame( new SplineFun(), args, 400, 400 );
	}

    }