applet1.java

矩阵乘法的计算程序

import java.awt.*;
import java.applet.*;
import java.io.*;
import java.awt.image.*;


public class Applet1 extends Applet implements Runnable 
{
	private Image img[],showImage;
	private MediaTracker imageTracker;
	private int ImageW,ImageH,totalImage=5,currentImage,nextImage;
	private Thread thread;
	private int delay;
	private Image offI;
	private Graphics offG;
	
	public void init()
	{
		this.setBackground(Color.black);
		
		img=new Image[totalImage];
		imageTracker=new MediaTracker(this);//this 为要显示图像的组件
		
		String s=new String("");
		for (int i=0;i<totalImage;i++)
		{
			s=getParameter("image"+(i+1));
			img[i]=getImage(getCodeBase(),s);
			imageTracker.addImage(img[i],0);
		}
		try {
			imageTracker.waitForID(0);
		}catch(InterruptedException e){}
		
		if (getParameter("delay")==null){
			delay=3000;
		}else{
			delay=Integer.parseInt(getParameter("delay"));
		}
		
		ImageW=img[0].getWidth(this);
		ImageH=img[0].getHeight(this);
		
		offI=createImage(ImageW,ImageH);
		offG=offI.getGraphics();
		
	}

	public void paint(Graphics g)
	{
		g.drawImage(offI,0,0,this);
	}
	
	public void update(Graphics g)
	{
		paint(g);
	}
	
	public void start()
	{
		if (thread==null)
		{
			currentImage=0;
			thread=new Thread(this);
			thread.start();
		}
	}
	
	public void run()
	{
		while(thread!=null)
		{
			try
			{
				Thread.sleep(delay);
				
				/*for(int i=0;i<=(ImageW/2);i++)
				{
					thread.sleep(30);
					offG.setColor(Color.white);
					offG.fillRect(0,0,ImageW,ImageH);
					offG.drawImage(img[currentImage],i,0,ImageW-2*i,ImageH,this);
					repaint();
				}
				
				currentImage=((currentImage+1)%totalImage);
				
				for(int i=0;i<=(ImageW/2);i++)
				{
					thread.sleep(30);
					offG.setColor(Color.white);
					offG.fillRect(0,0,ImageW,ImageH);
					offG.drawImage(img[currentImage],(ImageW/2)-i,0,2*i,ImageH,this);
					repaint();
				}*/
				
				nextImage=((currentImage+1)%totalImage);
				for(int i=0;i<=(ImageW/2);i++)
				{
					thread.sleep(30);
					offG.drawImage(img[nextImage],0,0,ImageW,ImageH,this);
					offG.drawImage(img[currentImage],i,0,ImageW-2*i,ImageH,this);
					repaint();
				}
				currentImage=nextImage;
		
			}catch(InterruptedException e){}
		}
	}
}