import java.awt.Color;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.beans.Customizer;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Calendar;
import java.util.Date;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Clock extends JButton implements Customizer, Externalizable,
Runnable {
protected PropertyChangeSupport propertyChangeSupport;
protected boolean isDigital = false;
protected Calendar calendar = Calendar.getInstance();
public Clock() {
propertyChangeSupport = new PropertyChangeSupport(this);
setBackground(Color.white);
setForeground(Color.black);
(new Thread(this)).start();
}
public void writeExternal(ObjectOutput out) throws IOException {
out.writeBoolean(isDigital);
out.writeObject(getBackground());
out.writeObject(getForeground());
out.writeObject(getPreferredSize());
}
public void readExternal(ObjectInput in) throws IOException,
ClassNotFoundException {
setDigital(in.readBoolean());
setBackground((Color) in.readObject());
setForeground((Color) in.readObject());
setPreferredSize((Dimension) in.readObject());
}
public Dimension getPreferredSize() {
return new Dimension(50, 50);
}
public Dimension getMinimumSize() {
return getPreferredSize();
}
public Dimension getMaximumSize() {
return getPreferredSize();
}
public void setDigital(boolean digital) {
propertyChangeSupport.firePropertyChange("digital", new Boolean(
isDigital), new Boolean(digital));
isDigital = digital;
repaint();
}
public boolean getDigital() {
return isDigital;
}
public void addPropertyChangeListener(PropertyChangeListener lst) {
if (propertyChangeSupport != null)
propertyChangeSupport.addPropertyChangeListener(lst);
}
public void removePropertyChangeListener(PropertyChangeListener lst) {
if (propertyChangeSupport != null)
propertyChangeSupport.removePropertyChangeListener(lst);
}
public void setObject(Object bean) {
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Color colorRetainer = g.getColor();
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
getBorder().paintBorder(this, g, 0, 0, getWidth(), getHeight());
calendar.setTime(new Date()); // get current time
int hrs = calendar.get(Calendar.HOUR_OF_DAY);
int min = calendar.get(Calendar.MINUTE);
g.setColor(getForeground());
if (isDigital) {
String time = "" + hrs + ":" + min;
g.setFont(getFont());
FontMetrics fm = g.getFontMetrics();
int y = (getHeight() + fm.getAscent()) / 2;
int x = (getWidth() - fm.stringWidth(time)) / 2;
g.drawString(time, x, y);
} else {
int x = getWidth() / 2;
int y = getHeight() / 2;
int rh = getHeight() / 4;
int rm = getHeight() / 3;
double ah = ((double) hrs + min / 60.0) / 6.0 * Math.PI;
double am = min / 30.0 * Math.PI;
g.drawLine(x, y, (int) (x + rh * Math.sin(ah)), (int) (y - rh
* Math.cos(ah)));
g.drawLine(x, y, (int) (x + rm * Math.sin(am)), (int) (y - rm
* Math.cos(am)));
}
g.setColor(colorRetainer);
}
public void run() {
while (true) {
repaint();
try {
Thread.sleep(30 * 1000);
} catch (InterruptedException ex) {
break;
}
}
}
public static void main(String[] a) {
JFrame f = new JFrame();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Clock c = new Clock();
f.getContentPane().add("Center", c);
f.pack();
f.setSize(new Dimension(300, 300));
f.show();
}
}
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