clock.java

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import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.Timer;

public class Clock extends JFrame implements ActionListener
 { 

	private static final long serialVersionUID = 6790815213225162093L;
	Timer timer;
    int x,y,old_X,old_Y, r,x0,y0,w,h,ang; 
    int sdo,mdo,hdo,old_M,old_H; 
    TimeZone tz =TimeZone.getTimeZone("JST");
    final double RAD=Math.PI/180.0; 
    
@SuppressWarnings("deprecation")
public Clock()
  {
    	super("[思域]时钟"); 
     	setSize(300,300);
        setBackground(new Color(10,100,150));
        setResizable(false);    
        Dimension scr=Toolkit.getDefaultToolkit().getScreenSize();//在屏幕居中显示
        Dimension fra=this.getSize();
        if(fra.width>scr.width)
        {
            fra.width=scr.width;
        }
        if(fra.height>scr.height)
        {
            fra.height=scr.height;
        }
		this.setLocation((scr.width-fra.width)/2,(scr.height-fra.height)/2);
	    show();
    	int delay = 1000;
    
    	//窗体添加事件监听，监听秒表的触发
    	ActionListener taskPerformer = new ActionListener()
    	{
      		public void actionPerformed(ActionEvent evt) 
      		{
         		repaint();
      		}
    	};
    	new Timer(delay, taskPerformer).start();
  }
  
  public void actionPerformed(ActionEvent e) 
  {
        timer.restart();
  }

  public void paint( Graphics g ) 
  { 
		Insets insets = getInsets();
     	int L0 = (insets.left)/2, T0 = (insets.top)/2;
     	int hh,mm,ss; 
     	String st; 
     	h=getSize().height;
     	//绘制圆形
     	g.setColor(Color.white); 
     	g.drawOval(L0+30,T0+30,h-60,h-60);
     	g.drawOval(L0+32,T0+32,h-64,h-64);
     	r=h/2-30;
     	x0=30+r-5+L0;
     	y0=30+r-5-T0;
     	ang=60;
     	for (int i=1; i<=12; i++) 
     	{ 
        	x=(int)((r+10)*Math.cos(RAD*ang)+x0);
        	y=(int)((r+10)*Math.sin(RAD*ang)+y0);
        	g.drawString(""+i,x,h-y);
        	ang-=30;
     	} 
     	x0=30+r+L0; y0=30+r+T0;
     	//获取时间
     	Calendar now=Calendar.getInstance();
     	hh=now.get(Calendar.HOUR_OF_DAY);//小时
     	mm=now.get(Calendar.MINUTE);//分钟
     	ss=now.get(Calendar.SECOND);// 秒
     	g.setColor(Color.pink); 
     	g.fillRect(L0,T0,60,28);//填充的矩形
     	g.setColor(Color.blue); 
     	if (hh < 10) st="0"+hh;     else st=""+hh; 
     	if (mm < 10) st=st+":0"+mm; else st=st+":"+mm; 
     	if (ss < 10) st=st+":0"+ss; else st=st+":"+ss; 
     	g.drawString(st,L0,T0+25);
     	//计算时间和图形的关系
     	sdo=90-ss*6;
     	mdo=90-mm*6;
     	hdo=90-hh*30-mm/2;
     	//擦除秒针
     	if (old_X > 0) 
     	{
        	g.setColor(getBackground());
        	g.drawLine(x0,y0,old_X,(h-old_Y));
     	} else 
     	{ 
        	old_M=mdo;
        	old_H=hdo;
     	} 
     	//绘制秒针
     	g.setColor(Color.yellow); 
     	x=(int)((r-8)*Math.cos(RAD*sdo)+x0); 
     	y=(int)((r-8)*Math.sin(RAD*sdo)+y0)-2*T0; 
     	g.drawLine(x0,y0,x,(h-y));
     
     	old_X=x; 
     	old_Y=y; 
     	//擦除分针和时针
     	if (mdo != old_M) 
     	{
       		line(g,old_M,(int)(r*0.7),getBackground());
       		old_M=mdo;
     	} 
     	if (hdo != old_H) 
     	{
       		line(g,old_H,(int)(r*0.5),getBackground());
       		old_H=hdo;
	    } 
     	//绘制分针
     	line(g,mdo,(int)(r*0.7),Color.green);
     	//绘制时针
     	line(g,hdo,(int)(r*0.5),Color.red);
  } // end paint 

	public void line(Graphics g, int t, int n, Color c) 
   	{ 
		int [] xp = new int[4];
      	int [] yp = new int[4]; 
      	xp[0]=x0;
		yp[0]=y0;
      	xp[1]=  (int)((n-10)*Math.cos(RAD*(t-4))+x0); 
      	yp[1]=h-(int)((n-10)*Math.sin(RAD*(t-4))+y0); 
      	xp[2]=  (int)( n    *Math.cos(RAD* t   )+x0); 
      	yp[2]=h-(int)( n    *Math.sin(RAD* t   )+y0); 
      	xp[3]=  (int)((n-10)*Math.cos(RAD*(t+4))+x0); 
      	yp[3]=h-(int)((n-10)*Math.sin(RAD*(t+4))+y0); 
      	g.setColor(c); 
      	g.fillPolygon(xp,yp,4);
   }
   
	public static void main(String args[])
   	{
   		new Clock();
   	}
 }