animation.java

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/*
 * $Header$
 * $Date$ 
 * $Revision$
 * Copyright (C) 2003-2004 CIC, Tsinghua Univ. 
 */
package jcase.gui;

import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.image.CropImageFilter;
import java.awt.image.FilteredImageSource;
import java.util.StringTokenizer;

/**
 * Animation 
 */
public class Animation extends Applet implements Runnable{
	Image cell[];
	final int MAXSEQ = 64;
	int sequence[];
	int nseq;
	int idx;
	int framerate;
	boolean stopFlag;

	private int getParameter(String name, int def) {
		int n = def;
		String s=getParameter(name);
		if (s != null)
			try {
				n = Integer.parseInt(s);
			} catch (NumberFormatException e) {
				e.printStackTrace();
			}
		return n;
	}

	public void init() {
		framerate = getParameter("framerate", 5);
		int tilex = getParameter("cols", 1);
		int tiley = getParameter("rows", 1);
		cell = new Image[tilex * tiley];
		StringTokenizer st = new StringTokenizer(getParameter("sequence"), ",");
		sequence = new int[MAXSEQ];
		nseq = 0;
		while (st.hasMoreTokens() && nseq < MAXSEQ) {
			try{	
			sequence[nseq] = Integer.parseInt(st.nextToken());
			}catch(NumberFormatException e){
				sequence[nseq]=0;
			}
			nseq++;
		}

		try {
			Image img = getImage(getDocumentBase(), getParameter("img"));
			MediaTracker t = new MediaTracker(this);
			t.addImage(img, 0);
			t.waitForID(0);
			int iw = img.getWidth(null);
			int ih = img.getHeight(null);
			int tw = iw / tilex;
			int th = ih / tiley;
			CropImageFilter f;
			FilteredImageSource fis;
			for (int y = 0; y < tiley; y++) {
				for (int x = 0; x < tilex; x++) {
					f = new CropImageFilter(tw * x, th * y, tw, th);
					fis = new FilteredImageSource(img.getSource(), f);
					int i = y * tilex + x;
					cell[i] = createImage(fis);
					t.addImage(cell[i], i);
				}
			}
			t.waitForAll();

		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

	public void update(Graphics g) { 
		g.drawImage(cell[sequence[idx]], 0, 0, null);
	}

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

	Thread t;

	public void start() {
		t = new Thread(this);
		stopFlag = false;
		t.start();
	}

	public void stop() {
		stopFlag = true;
	}

	public void run() {
		idx = 0;
		while (true) {

			repaint();
			idx = (idx + 1) % nseq;
			try {
				Thread.sleep(1000 / framerate);
			} catch (Exception e) {
			}

			if (stopFlag)
				return;
		}
	}
}