/**
 * CircularFilterApplet2.java
 * Copyright (c) 1998 Yoon Kyung Koo. All rights reserved.
 *
 * First release date 1998/06/07
 *
 * @version 1.0c 1998/07/07
 * @author <A HREF="mailto:yoonforh@moon.daewoo.co.kr">Yoon Kyung Koo</A>
 */

import java.awt.*;
import java.awt.image.*;

/**
 * CircularFilterApplet2 class
 * This applet shows an image filter example
 */

public class CircularFilterApplet2
	extends java.applet.Applet implements Runnable
{
	private Image image=null;
	private int nodes=0;
	private int amplitude=0;
	private int frameNo=0;
	private int currentFrame=0;
	private int animInterval=0;
	private Image filtered[]=null;
	private boolean isLoaded=false;
	private boolean isFiltered=false;
	private MediaTracker tracker=null;
	private Thread animThread=null;

	public void init() {
		image = getImage(getCodeBase(), getParameter("image"));
		String nodes = getParameter("node");
		if (nodes==null)
			this.nodes=5;
		else
			this.nodes=Integer.valueOf(nodes).intValue();
		String amplitude = getParameter("amplitude");
		if (amplitude==null)
			this.amplitude=15;
		else
			this.amplitude=Integer.valueOf(amplitude).intValue();
		String frameNo = getParameter("frame");
		if (frameNo==null)
			this.frameNo=5;
		else
			this.frameNo=Integer.valueOf(frameNo).intValue();
		String animInterval = getParameter("delay");
		if (animInterval==null)
			this.animInterval=100;
		else
			this.animInterval=Integer.valueOf(animInterval).intValue();
		tracker=new MediaTracker(this);
	}

	public void start() {
		tracker.addImage(image, 0);
		if (animThread==null) {
			animThread=new Thread(this);
			animThread.start();
		}
	}

	public void run() {
		Thread me=Thread.currentThread();
		try {
			tracker.waitForID(0);
			int width=image.getWidth(this);
			int height=image.getHeight(this);
			Point center=new Point(width/2, height/2);
			double radius=Math.sqrt(width*width/4.0+height*height/4.0);
			isLoaded=true;
			repaint();
			ImageProducer prod=image.getSource();
			filtered=new Image[frameNo];
			for (int i=0; i<frameNo; i++) {
				filtered[i]=createImage(new FilteredImageSource(prod, 
					new CircularImageFilter2(center, radius, nodes,
						amplitude, i, frameNo)));
				tracker.addImage(filtered[i], i+1);
			}
			tracker.waitForAll();
			currentFrame=0;
			isFiltered=true;
		} catch (InterruptedException ie) {}

		while (animThread==me) {
			try {
			Thread.currentThread().sleep(animInterval);
			} catch (InterruptedException ie) {}
			currentFrame=(++currentFrame)%frameNo;
			synchronized (this) {
				image=filtered[currentFrame];
			}
			repaint();
		}
	}

	public void stop() {
		synchronized (this) {
			animThread=null;
		}
		for (int i=0; i<frameNo; i++) 
			tracker.removeImage(filtered[i], i+1);
	}

	public void paint(Graphics g) {
		if (image==null) {
			Font font = new Font("Helvetica", Font.BOLD, 12);
			g.setFont(font);
			g.drawString("You should specify image parameter", 10, 10);
			return;
		}
		if (!isLoaded) {
			g.drawString("loading images...", 10, 10);
			return;
		}
		if (isFiltered) {
			g.drawImage(filtered[currentFrame], 0, 0, Color.black, this);
			/*
			int j=0;
			for (int i=0; i<frameNo; i++) {
				if (i%5==0)
					j++;
				g.drawImage(filtered[i], image.getWidth(this)*(i%5), image.getHeight(this)*j, this);
			}
			*/
		}
		else {
			g.drawImage(image, 0, 0, this);
			g.setColor(Color.gray);
			g.fillRect(3, 3, image.getWidth(this)-3, 30);
			g.setColor(Color.blue);
			g.fillRect(0, 0, image.getWidth(this)-3, 30);
			Font font = new Font("Helvetica", Font.BOLD, 12);
			g.setFont(font);
			g.setColor(Color.white);
			g.drawString("Processing images...", 10, 10);
		}
	}

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

}