import java.awt.*;
import java. applet.*;
public class NewApplet extends java.applet.Applet implements java.lang.Runnable{
    int x,y,w,h;//方框的参数
    int sw,sh;//屏幕的高宽
    int i,k;
    int n;
    int nw,nh;//小方格的高和宽
    int pxi,pyi;//图片的初始格数
    int px,py;//图片的位置
    int dx,dy;//图片的增量   
    Image p;
    Thread u_thread;
    public void init() {
        x=2;y=2;w=500;h=440;//方框的参数
        sw=this.getWidth();sh=this.getHeight();//屏幕的高宽
        n=10;
        nw=w/n;nh=h/n;//小方格的高和宽
        pxi=0;pyi=0;//图片的初始格数
        px=pxi*nw;py=pyi*nh;//图片的位置
        dx=1;dy=1;//图片的增量
        p=getImage(getDocumentBase(), "em51.gif");
       
      
    }
    public void 方框(Graphics g){
        sw=this.getWidth();sh=this.getHeight();
        g.setColor(java.awt.Color.pink);
        g.fillRect((sw-w)/2,(sh-h)/2, w, h);
        g.drawRect((sw-w)/2,(sh-h)/2, w, h);
    }
    public void 框格(Graphics g){ 
   
        sw=this.getWidth();sh=this.getHeight();

         g.translate((sw-w)/2,(sh-h)/2);//平移坐标位置
         g.setColor(java.awt.Color.WHITE);
         g.drawRect(x-1,y-1, w-2, h-2);//方框的外边框
         for(i=1;i<n;i++){
              g.setColor(java.awt.Color.WHITE);
              g.drawLine(x,i*(nh), w, i*(nh));//横线
              g.drawLine(i*(nw),y,i*(nw), h);//竖线
              g.setColor(java.awt.Color.LIGHT_GRAY);
              g.drawLine(x,i*(nh)+1, w, i*(nh)+1);//横线的错位
              g.drawLine(i*(nw)+1,y,i*(nw)+1, h);//竖线的错位
         }
    }
    public void 加载图画(Graphics g){
        pxi=0;pyi=0;//图片的初始格数
        px=pxi*nw;py=pyi*nh;//图片的位置
        g.drawImage(p,px,py,this);
     
    }   
    public void paint(Graphics g) {
    super.paint(g);
         方框(g);
         框格(g); 
         加载图画(g);
           
    }
     public void start(){      
        if (u_thread == null)
        {
            u_thread  = new Thread(this);
            u_thread.start();
        }
    }
    public void run() {
        while(true){  
            //图片运动
                pxi=0;pyi=0;
                pxi=pxi +dx;
                pyi=pyi+dy;
           for(k=0;k<(n+1)/2;k++){
           for(i=k;i<n-k;i++)
           {
                pxi = pxi + i; 
                pyi=k;
           }
           for(i=k+1;i<n-k;i++)
           {
           pxi=n-k+1;
           pyi=pyi+i;
           }
           for(i=n-k-2;i>=k;i--)
           {
               pxi=pxi+i;
               pyi=n-k-1;
           }
            for(i=n-k-2;i>=k;i--)
           {
            pxi=k;
            pyi=pyi+i;
            }
           }
         
       repaint();
 
            try{
                u_thread.sleep(600);
            }catch (InterruptedException e){
                return;
            }
}//while
  }//public void run()
    
    //减小不必要的重画动作
    public void repaint()  {
        super.repaint();
     }  
    
   public void update(Graphics g) {
     paint(g);
    }//减小不必要的重画动作

}

 public void paintComponent(Graphics g)
 {
    System.out.println("paintComponent invoked!");
    // call superclass's method, in case it needs
    // to do anything
    super.paintComponent(g);
    // get a graphics 2d reference
    Graphics2D g2 = (Graphics2D) g;

   
   if( myRect==null)
   {
      g2.drawString(" ",6,60); 
   }
   
   else{
       myRect.setFrame(R[0],R[1],5,5);
       g2.draw(myRect);
   }

 }

public void drawRectangle(String line)
    {
        a=0;
        this.line=line;
        StringBuffer buf =new StringBuffer(line).append(" ");
        for(i=0; i<buf.length(); )
        {
            j=i;
            while(buf.charAt(i)>=48 && buf.charAt(i)<=57)
           {
               i++;
               //System.out.print("i:"+i+'\n');
           }
           //System.out.print("i2:"+i+"j:"+j+'\n');

           String rx= buf.substring(j,i);
          R[a]=Double.valueOf(rx).doubleValue();
           System.out.print("a:"+a+"rx:"+R[a]+'\n');
           a++;
           i++;
                         
           myRect = new Rectangle2D.Double(R[0],R[1],5,5);
     super.repaint();
        }
        
    }