// * This code is licensed under:
// * JHPlot License, Version 1.2
// * - for license details see http://hepforge.cedar.ac.uk/jhepwork/ 
// *
// * Copyright (c) 2007 by S.Chekanov (chekanov@mail.desy.de). 
// * All rights reserved.
// * Statement: This package is rewrite of the Browser3D. It's free. I do not know 
// * the author name. 


package jhplot.v3d;
// Animation.java

import java.applet.Applet;
import java.awt.Event;
import java.awt.Graphics;
import java.awt.Image;

abstract public class Animation extends Applet implements Runnable 
{
    /**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	Thread thread = null;
    boolean threadSuspended = false;
    Model3d md = null;
    Image backBuffer = null;
    Graphics backGC = null;
    int delay = 0;
    static final boolean showFPS = true;
    static final boolean debug = false;
    boolean painted;

    public void init() 
    {
        try 
        {
            delay = Integer.valueOf(getParameter("sleep")).intValue();
        }   
        catch(Exception e) 
        {
            delay = 0;
        }
    }

    public void start()
    {
        if (thread == null)
        {
            threadSuspended = false;
            thread = new Thread(this);
            thread.setPriority(Thread.MIN_PRIORITY);
            thread.start();
        }
    }

    public void stop()
    {
        if (thread != null)
        {
            thread.stop();
            thread = null;
        }
        md = null;
        backBuffer = null;
        backGC = null;
    }

    public void update(Graphics g) 
    {
        if (backBuffer == null)
            g.clearRect(0, 0, size().width, size().height);
        paint(g);
    }

    public void paint(Graphics g) 
    {
        if (md != null) 
        {
            if (backBuffer != null) 
            {
                backGC.setColor(getBackground());
                backGC.fillRect(0,0,size().width,size().height);
                md.paint(backGC);
                g.drawImage(backBuffer, 0, 0, this);
            } 
            else
                md.paint(g);
        }
        setPainted();
    }
    
    synchronized void setPainted() 
    {
        painted = true;
        notifyAll();
    }

    synchronized void waitPainted() 
    {
        while (!painted)
            try 
            {   
                wait(); 
            } 
            catch (Exception e) 
            {
            }
        painted = false;
    }

    public boolean mouseDown(Event e, int x, int y) 
    {
        if (thread != null)
        {
            if (threadSuspended) 
                thread.resume();
            else 
                thread.suspend();
            threadSuspended = !threadSuspended;
        }
        return true;
    }

    abstract Model3d createModel();

    public void run() 
    {
        md = createModel();
        if (!debug)
        {
            backBuffer = createImage(size().width, size().height);
            backGC = backBuffer.getGraphics();
        }
        long frame = 0;
        long startTime = System.currentTimeMillis();
        while (thread != null)
        {
            repaint();
            waitPainted();
            frame++;
            if (showFPS && frame % 100 == 0)
            {
                long currentTime = System.currentTimeMillis();
                long dt = currentTime - startTime;
                if (dt > 0)
                {
                    int fps = (int) (100 * 1000 / dt);
                    showStatus("FPS " + fps);
                }
                startTime = currentTime;
            }
            if (delay > 0)
                try
                {
                    Thread.sleep(delay);
                }
                catch (InterruptedException e)
                {
                }
        }
    }

}