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import java.awt.*;

import java.awt.event.*;

import java.awt.geom.*;

import java.util.Calendar;

import javax.swing.*;

public class Clock extends JPanel implements ActionListener

{

//創建時鐘的外形

protected static Ellipse2D face = new Ellipse2D.Float( 3, 3, 94, 94 );

//創建時鐘的標記

protected static GeneralPath tick = new GeneralPath();

static

{

tick.moveTo( 100, 100 );

tick.moveTo( 49, 0 );

tick.lineTo( 51, 0 );

tick.lineTo( 49, 6 );

tick.lineTo( 49, 0 );

}

//創建時針

protected static GeneralPath hourHand = new GeneralPath();

static

{

hourHand.moveTo( 50, 15 );

hourHand.lineTo( 53, 50 );

hourHand.lineTo( 50, 53 );

hourHand.lineTo( 47, 50 );

hourHand.lineTo( 50, 15 );

}

//創建分針

protected static GeneralPath minuteHand = new GeneralPath();

static

{

minuteHand.moveTo( 50, 2 );

minuteHand.lineTo( 53, 50 );

minuteHand.lineTo( 50, 58 );

minuteHand.lineTo( 47, 50 );

minuteHand.lineTo( 50, 2 );

}

//創建秒針

protected static GeneralPath secondHand = new GeneralPath();

static

{

secondHand.moveTo( 49, 5 );

secondHand.lineTo( 51, 5 );

secondHand.lineTo( 51, 62 );

secondHand.lineTo( 49, 62 );

secondHand.lineTo( 49, 5 );

}

//設置時鐘的顏色e69da5e887aa3231313335323631343130323136353331333262383636

protected static Color faceColor = new Color( 220, 220, 220 );

protected static Color hourColor = Color.red.darker();

protected static Color minuteColor = Color.blue.darker();

protected static Color secondColor = new Color( 180, 180, 0 );

protected static Color pinColor = Color.gray.brighter();

//設置時鐘的樞紐

protected Ellipse2D pivot = new Ellipse2D.Float( 47, 47, 6, 6 );

protected Ellipse2D centerPin = new Ellipse2D.Float( 49, 49, 2, 2 );

//創建饒時鐘樞紐轉的變換

protected AffineTransform hourTransform =

AffineTransform.getRotateInstance( 0, 50, 50 );

protected AffineTransform minuteTransform =

AffineTransform.getRotateInstance( 0, 50, 50 );

protected AffineTransform secondTransform =

AffineTransform.getRotateInstance( 0, 50, 50 );

//創建每秒觸發一次的Timer

protected Timer timer = new Timer( 1000, this );

protected Calendar calendar = Calendar.getInstance();

public Clock()

{

setPreferredSize( new Dimension( 100, 100 ) );

}

public void addNotify()

{

super.addNotify();

timer.start();

}

public void removeNotify()

{

timer.stop();

super.removeNotify();

}

public void actionPerformed( ActionEvent event )

{

//更新calendar的時間

this.calendar.setTime( new java.util.Date() );

int hours = this.calendar.get( Calendar.HOUR );

int minutes = this.calendar.get( Calendar.MINUTE );

int seconds = this.calendar.get( Calendar.SECOND );

//設置變換， 使得時針、分針、秒針各自繞樞紐旋轉一定的角度

hourTransform.setToRotation( ( ( double ) hours ) * ( Math.PI / 6.0 ), 50, 50 );

minuteTransform.setToRotation( ( ( double ) minutes ) * ( Math.PI / 30.0 ), 50, 50 );

secondTransform.setToRotation( ( ( double ) seconds ) * ( Math.PI / 30.0 ), 50, 50 );

repaint();

}

public void paint( Graphics g )

{

super.paint( g );

//得到圖形上下文和抗鋸齒處理

Graphics2D g2 = ( Graphics2D ) g;

g2.setRenderingHint( RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON );

g2.setPaint( faceColor );

g2.fill( face );

g2.setPaint( Color.black );

g2.draw( face );

//產生鐘面上12個滴答位置

for( double p = 0.0; p < 12.0; p += 1.0 )

{

//利用變換畫出同心的滴答的標線

g2.fill( tick.createTransformedShape(

AffineTransform.getRotateInstance( ( Math.PI / 6.0 ) * p, 50, 50 ) ) );

}

g2.setPaint( hourColor );

g2.fill( hourHand.createTransformedShape( hourTransform ) );

g2.setPaint( minuteColor );

g2.fill( minuteHand.createTransformedShape( minuteTransform ) );

g2.setPaint( secondColor );

g2.fill( secondHand.createTransformedShape( secondTransform ) );

g2.fill( pivot );

g2.setPaint( pinColor );

g2.fill( centerPin );

}

public static void main( String[] args )

{

JFrame frame = new JFrame();

frame.setLocation( 700, 400 );

frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

frame.getContentPane().add( new Clock() );

frame.pack();

frame.show();

}

}

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