自由手記

import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.Timer;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
* @author sidwang
*/
public class Javaclock {

public static void main(String[] args){
JFrame ClockFrame = new JFrame("Java 指针時鐘");
final ClockPanel clockPanel = new ClockPanel();

ClockFrame.add(clockPanel);
Timer uptime = new Timer(1000, new ActionListener(){
@Override
public void actionPerformed(ActionEvent ae) {
clockPanel.upTimer();
}
});

ClockFrame.setBounds(400,300,400,400);
ClockFrame.setResizable(false);
ClockFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ClockFrame.setVisible(true);
uptime.start();
}
}

class ClockPanel extends JPanel{
Calendar calTime = new GregorianCalendar();
String number[] = {"12", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11" };
int sx,sy,mx,my,sx1,sy1;
double hx,hy;
int minute;
int second;
int hour;
int OX = 200;
int OY = 190;
int i;

public ClockPanel(){
setBackground(Color.BLACK);
setLayout(null);
minute = calTime.get(Calendar.MINUTE); 
second = calTime.get(Calendar.DATE);
hour = calTime.get(Calendar.HOUR);
}

public void upTimer(){
calTime.setTimeInMillis( System.currentTimeMillis() ); 
repaint(); 
}

@Override
public void paintComponent(Graphics grap){
super.paintComponent(grap);
minute = calTime.get(Calendar.MINUTE);
second = calTime.get(Calendar.SECOND);
hour = calTime.get(Calendar.HOUR);
grap.setColor(Color.WHITE);
grap.drawLine(OX, OY, (int)( OX+100*Math.sin(second*Math.PI/30) ), (int)( OY-100*Math.cos(second*Math.PI/30) ) );
grap.drawLine(OX, OY, (int)(OX+20*Math.sin((second-30)*Math.PI/30)), (int)(OY-20*Math.cos((second-30)*Math.PI/30)));
grap.setColor(Color.YELLOW);
grap.drawLine(OX, OY, (int)(OX+80*Math.sin(minute*Math.PI/30)), (int)(OY-80*Math.cos(minute*Math.PI/30)) );
grap.setColor(Color.RED);
grap.drawLine(OX, OY, (int)(OX+55*Math.sin( (hour+minute/60.0) * Math.PI/6) ), (int)(OY-55*Math.cos( (hour+minute/60.0) * Math.PI/6) ));
grap.setColor(Color.BLUE);
paintNumber(grap);
//grap.drawString("Name: Clock for Java", 20, 20);
//grap.drawString("Author: Sid Wang"+"\n", 20, 35);
//grap.drawString("Time: 2013-10-28", 20, 50);
}

public void paintNumber(Graphics gra){
gra.setColor(Color.BLUE);
for(i=0; i<60; i++){
gra.drawLine((int)(OX-115*Math.cos(i*Math.PI/30)),
(int)(OY+115*Math.sin(i*Math.PI/30)),
(int)(OX-120*Math.cos(i*Math.PI/30)),
(int)(OY+120*Math.sin(i*Math.PI/30)) );
}

for(i=0; i<12; i++){
gra.setColor(Color.RED);
gra.drawLine( (int)(OX-110*Math.cos(i*Math.PI/6)),
(int)(OY+110*Math.sin(i*Math.PI/6)),
(int)(OX-120*Math.cos(i*Math.PI/6)),
(int)(OY+120*Math.sin(i*Math.PI/6)));
gra.setColor(Color.lightGray); 
gra.drawString(number[i], (int)(OX+135*Math.sin(i*Math.PI/6))-5,(int)(OY-135*Math.cos(i*Math.PI/6))+5 );
}
}
}