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/**
* @version 1.20 1999-04-27
* @author Cay Horstmann
*/
import java.awt.Container;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TimerTest {
public static void main(String[] args) {
JFrame f = new TimerTestFrame();
f.show();
}
}
class TimerTestFrame extends JFrame {
public TimerTestFrame() {
setSize(450, 300);
setTitle("TimerTest");
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Container c = getContentPane();
c.setLayout(new GridLayout(2, 3));
c.add(new ClockCanvas("San Jose", "GMT-8"));
c.add(new ClockCanvas("Taipei", "GMT+8"));
c.add(new ClockCanvas("Berlin", "GMT+1"));
c.add(new ClockCanvas("New York", "GMT-5"));
c.add(new ClockCanvas("Cairo", "GMT+2"));
c.add(new ClockCanvas("Bombay", "GMT+5"));
}
}
interface TimerListener {
void timeElapsed(Timer t);
}
class Timer extends Thread {
public Timer(int i, TimerListener t) {
target = t;
interval = i;
setDaemon(true);
}
public void run() {
try {
while (!interrupted()) {
sleep(interval);
target.timeElapsed(this);
}
} catch (InterruptedException e) {
}
}
private TimerListener target;
private int interval;
}
class ClockCanvas extends JPanel implements TimerListener {
public ClockCanvas(String c, String tz) {
city = c;
calendar = new GregorianCalendar(TimeZone.getTimeZone(tz));
Timer t = new Timer(1000, this);
t.start();
setSize(125, 125);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawOval(0, 0, 100, 100);
double hourAngle = 2 * Math.PI * (seconds - 3 * 60 * 60)
/ (12 * 60 * 60);
double minuteAngle = 2 * Math.PI * (seconds - 15 * 60) / (60 * 60);
double secondAngle = 2 * Math.PI * (seconds - 15) / 60;
g.drawLine(50, 50, 50 + (int) (30 * Math.cos(hourAngle)),
50 + (int) (30 * Math.sin(hourAngle)));
g.drawLine(50, 50, 50 + (int) (40 * Math.cos(minuteAngle)),
50 + (int) (40 * Math.sin(minuteAngle)));
g.drawLine(50, 50, 50 + (int) (45 * Math.cos(secondAngle)),
50 + (int) (45 * Math.sin(secondAngle)));
g.drawString(city, 0, 115);
}
public void timeElapsed(Timer t) {
calendar.setTime(new Date());
seconds = calendar.get(Calendar.HOUR) * 60 * 60
+ calendar.get(Calendar.MINUTE) * 60
+ calendar.get(Calendar.SECOND);
repaint();
}
private int seconds = 0;
private String city;
private int offset;
private GregorianCalendar calendar;
private final int LOCAL = 16;
}
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