myclock.java

java GUI使用实现的日历

package MyCalender;

/*
 * Copyright (c) 2003 Sun Microsystems, Inc. All  Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * -Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 * 
 * -Redistribution in binary form must reproduct the above copyright
 *  notice, this list of conditions and the following disclaimer in
 *  the documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT
 * BE LIABLE FOR ANY DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT
 * OF OR RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THE SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN
 * IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that Software is not designed, licensed or intended for
 * use in the design, construction, operation or maintenance of any nuclear
 * facility.
 */

/*
 * @(#)Clock.java	1.12 03/01/23
 */

import java.util.*;
import javax.swing.JButton;
import java.awt.*;
import java.awt.Color;
import java.applet.*;
import java.text.*;

import javax.swing.JPanel;
import javax.swing.JSpinner;

/**
 * Time!
 * 
 * @author 邱鹏
 * @verson 1.0
 * @date:2008年4月2日 *****类的作用：绘制时钟******
 */
public class MyClock extends JPanel implements Runnable {
	private volatile Thread timer; // The thread that displays clock

	private int lastxs, lastys, lastxm, lastym, lastxh, lastyh; // Dimensions

	// used to draw
	// hands

	private SimpleDateFormat formatter; // Formats the date displayed

	private String lastdate; // String to hold date displayed

	private Font clockFaceFont; // Font for number display on clock

	private Date currentDate; // Used to get date to display

	private Color handColor; // Color of main hands and dial

	private Color numberColor; // Color of second hand and numbers

	private int xcenter = 80, ycenter = 55; // Center position

	// --------------------------------------------------------------------------------------------

	public MyClock() {
		super();
		setLayout(null);
		init();
		start();
	}

	// --------------------------------------------------------------------------------------------
	public void init() {
		int x, y;
		lastxs = lastys = lastxm = lastym = lastxh = lastyh = 0;
		formatter = new SimpleDateFormat("EEE MMM dd hh:mm:ss yyyy", Locale
				.getDefault());
		currentDate = new Date();
		lastdate = formatter.format(currentDate);
		clockFaceFont = new Font("Serif", Font.PLAIN, 14);
		handColor = Color.blue;
		numberColor = Color.darkGray;
		this.setBackground(new Color(128, 128, 192));
		resize(300, 300); // Set clock window size
	}

	// --------------------------------------------------------------------------------------------
	// Paint is the main part of the program
	public void paint(Graphics g) {

		// g.clearRect(0,0,this.getWidth(),this.getHeight());
		paintMe(g);
		int xh, yh, xm, ym, xs, ys;
		int s = 0, m = 10, h = 10;
		String today;
		Calendar c = Calendar.getInstance();
		currentDate = new Date();

		s = c.get(Calendar.SECOND);
		m = c.get(Calendar.MINUTE);
		h = c.get(Calendar.HOUR);

		// Set position of the ends of the hands
		xs = (int) (Math.cos(s * Math.PI / 30 - Math.PI / 2) * 45 + xcenter);
		ys = (int) (Math.sin(s * Math.PI / 30 - Math.PI / 2) * 45 + ycenter);
		xm = (int) (Math.cos(m * Math.PI / 30 - Math.PI / 2) * 40 + xcenter);
		ym = (int) (Math.sin(m * Math.PI / 30 - Math.PI / 2) * 40 + ycenter);
		xh = (int) (Math.cos((h * 30 + m / 2) * Math.PI / 180 - Math.PI / 2) * 30 + xcenter);
		yh = (int) (Math.sin((h * 30 + m / 2) * Math.PI / 180 - Math.PI / 2) * 30 + ycenter);

		// Get the date to print at the bottom
		formatter.applyPattern("EEE MMM dd HH:mm:ss yyyy");
		today = formatter.format(currentDate);

		g.setFont(clockFaceFont);
		// Erase if necessary
		g.setColor(getBackground());
		if (xs != lastxs || ys != lastys) {
			g.drawLine(xcenter, ycenter, lastxs, lastys);
			g.drawString(lastdate, 5, 125);
		}
		if (xm != lastxm || ym != lastym) {
			g.drawLine(xcenter, ycenter - 1, lastxm, lastym);
			g.drawLine(xcenter - 1, ycenter, lastxm, lastym);
		}
		if (xh != lastxh || yh != lastyh) {
			g.drawLine(xcenter, ycenter - 1, lastxh, lastyh);
			g.drawLine(xcenter - 1, ycenter, lastxh, lastyh);
		}

		// Draw date and hands
		g.setColor(numberColor);
		g.drawString(today, 140, 50);
		g.drawLine(xcenter, ycenter, xs, ys);
		g.setColor(handColor);
		g.drawLine(xcenter, ycenter - 1, xm, ym);
		g.drawLine(xcenter - 1, ycenter, xm, ym);
		g.drawLine(xcenter, ycenter - 1, xh, yh);
		g.drawLine(xcenter - 1, ycenter, xh, yh);
		lastxs = xs;
		lastys = ys;
		lastxm = xm;
		lastym = ym;
		lastxh = xh;
		lastyh = yh;
		lastdate = today;

	}

	// --------------------------------------------------------------------------------------------
	public void paintMe(Graphics g) {
		g.clearRect(0, 0, this.getWidth(), this.getHeight());
		g.setFont(clockFaceFont);
		// 绘制圆形和数字
		g.setColor(Color.WHITE);
		g.fillOval(xcenter - 50, ycenter, 9, 3);
		g.fillOval( xcenter + 40, ycenter,9,3);
		g.fillOval(xcenter  , ycenter - 44,3,9);
		g.fillOval( xcenter , ycenter + 42,3,9);
		
		
		g.setColor(handColor);
		g.drawArc(xcenter - 50, ycenter - 50, 100, 100, 0, 360);
		g.setColor(numberColor);
		g.drawString("9", xcenter - 45, ycenter + 3);
		g.drawString("3", xcenter + 40, ycenter + 3);
		g.drawString("12", xcenter - 5, ycenter - 37);
		g.drawString("6", xcenter - 3, ycenter + 45);

		// Draw date and hands
		g.setColor(numberColor);
		g.drawString(lastdate, 5, 125);
		g.drawLine(xcenter, ycenter, lastxs, lastys);
		g.setColor(handColor);
		g.drawLine(xcenter, ycenter - 1, lastxm, lastym);
		g.drawLine(xcenter - 1, ycenter, lastxm, lastym);
		g.drawLine(xcenter, ycenter - 1, lastxh, lastyh);
		g.drawLine(xcenter - 1, ycenter, lastxh, lastyh);

	}

	// --------------------------------------------------------------------------------------------
	public void start() {
		timer = new Thread(this);
		timer.start();
	}

	// --------------------------------------------------------------------------------------------
	public void stop() {
		timer = null;
	}

	// --------------------------------------------------------------------------------------------
	public void run() {
		Thread me = Thread.currentThread();
		while (timer == me) {
			try {

				Thread.currentThread().sleep(100);
			} catch (InterruptedException e) {
			}

			// repaint();
			update(this.getGraphics());
		}
	}
	// --------------------------------------------------------------------------------------------
}