/*   アニメーション実験  Ver 0.10   */
/*                                  */
/*                                  */
/*   by Atsushi         2005/8/20   */


package animation.animation;

import java.awt.*;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageFilter;
import net.antun.lib.awt.image.WaveImageFilter;
import animation.Animation;


public class PreFilteringAnimation extends Animation implements Runnable
{
	/*   ---   Field   ---   */

	private Thread loop=null;
	private boolean stop;

	private Image[] image;

	/*   ---   Constructor   ---   */

	public PreFilteringAnimation(Image baseImage)
	{
		super(baseImage);
	}

	/*   ---   初期化   ---   */

	private void initImage()
	{
		WaveImageFilter filter;
		MediaTracker tracker;
		double k;
		int x,y;
	
		tracker=new MediaTracker(component);
		image=new Image[24*4];
		for (int frame=0;frame<=image.length-1;frame++)
		{
			k=((double)(frame%(24*4)))/(24*4);
			filter=new WaveImageFilter(
			    48,(int)(12-Math.abs(12-24*k)),-frame*Math.PI/5.0);
			image[frame]=component.createImage(
			    new FilteredImageSource(baseImage.getSource(),filter));
			tracker.addImage(image[frame],frame);
			
			try {tracker.waitForID(frame);}
			catch (InterruptedException e) { e.printStackTrace(); }
			
			if (stop) return;
		}
	}

	/*   ---   アニメーション   ---   */

	public void startAnimation()
	{
		if (loop==null && component!=null)
		{
			stop=false;
			
			loop=new Thread(this,"Animation");
			loop.start();
		}
	}

	public void run()								// loop
	{
		Graphics g;
		int counter;
	
		initImage();
		
		counter=0;
		g=component.getGraphics();
		component.paint(g);
		
		while (true)
		{
			if (stop) break;
			
			paintImage(counter++);
			
			component.update(g);
			
			if (stop) break;
			
			synchronized (this)
			{
				try {Thread.sleep(40);}
				catch (InterruptedException e) {}
			}
		}
		loop=null;
	}

	private void paintImage(int counter)
	{
		int frame;
		int x,y;
	
		frame=counter%image.length;
		x=baseImage.getWidth (null)/2-image[frame].getWidth (null)/2;
		y=baseImage.getHeight(null)/2-image[frame].getHeight(null)/2;
		g.drawImage(image[frame],x,y,null);
	}

	public void stopAnimation()
	{
		if (loop!=null)
		{
			stop=true;
			
			try {loop.join();}
			catch (InterruptedException e) {}
			
			for (int i=0;i<=image.length-1;i++) image[i].flush();
		}
	}
}