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;
	
	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);
		
		currentImage=0;
		showImage=img[0];
		
		thread =new Thread(this);
		thread.start();
		
	}

	public void paint(Graphics g)
	{
		g.drawImage(showImage,0,0,this);
	}
	
	public void update(Graphics g)
	{
		paint(g);
	}
	
	public void start()
	{
		if (thread==null)
		{
			thread=new Thread(this);
			thread.start();
		}
	}
	
	public void run()
	{
		showImage=createImage(ImageW,ImageH);
		Graphics g=showImage.getGraphics();
		while(true)
		{
			try
			{
				Thread.sleep(delay);
				
				nextImage=(currentImage+1)%totalImage;
				/*while(true)
				{
					for(int x=(ImageW/2),y=(ImageH/2),i=0;(x>(-ImageW/10));x-=(ImageW/10),y-=(ImageH/10),i++)
					{
						g.drawImage(img[currentImage],0,0,this);
						
						g.drawImage(img[nextImage],x,y,2*(ImageW*i)/10,2*(ImageH*i)/10,this);
						repaint();
						Thread.sleep(100);
					}
					currentImage=nextImage;
					repaint();
					break;
				}*/
				while(true)
				{
					for(int x=0,y=0,i=0;x<=ImageW;x+=(ImageW/10),y+=(ImageH/10),i++)
					{
						g.drawImage(img[currentImage],0,0,ImageW,ImageH,this);
						
						g.drawImage(img[nextImage],0,0,x,y,this);
						repaint();
						Thread.sleep(100);
					}
					currentImage=nextImage;
					repaint();
					break;
				}
			}catch(InterruptedException e){}
		}
	}
}