clockpanel.java

本次实验中用Java实现的Calendar具有跨平台运行能力

package edu.swjtu.sist.java.calendar;

import java.awt.*;
import java.awt.event.*;
import java.util.Calendar;

import javax.swing.JPanel;
import javax.swing.JTextField;

/**
 * 时钟显示类
 * 
 * @author [e-mail]
 * @version 1.0
 */

class ClockPanel extends JPanel implements Runnable, MouseListener
{
    private int xcenter = 80, ycenter = 65, hh, mm, ss;

    private Thread timer = null;

    private Scrollbar scr2 = new Scrollbar();

    private JTextField timeField = new JTextField();

    int mode = 1;

    ClockPanel()
    {
        setLayout(null);
        scr2.setBounds(new Rectangle(130, 135, 12, 18));
        timeField.setBounds(new Rectangle(20, 136, 110, 18));
        add(scr2);
        add(timeField);
        //tf_time.setEditable(false);
        timeField.setBackground(Color.white);
        timeField.addMouseListener(this);

    }

    public void paintComponent(Graphics g)
    {
        Graphics2D g2 = (Graphics2D) g;
        g2.setColor(getBackground());//消除原有图象
        g2.setColor(SystemColor.controlLtHighlight);
        g2.fillRect(0, 0, 160, 130);
        g2.setColor(SystemColor.controlHighlight);
        g2.fill3DRect(80, 65, 2, 2, false);//时钟中心
        g2.setColor(Color.green);

        for (int i = 0; i < 60; i++)
        {
            double cos = Math.cos((i * 3.14f) / 30);
            double sin = Math.sin((i * 3.14f) / 30);
            if (i % 5 == 0)//正点用不同色显示
            {
                g2.setColor(Color.blue);
                g2.fill3DRect((int) (xcenter + 60 * sin),
                        (int) (ycenter - 60 * cos), 3, 3, true);//
            }
            else
            {
                g2.setColor(getBackground());
                g2.fill3DRect((int) (xcenter + 60 * sin),
                        (int) (ycenter - 60 * cos), 3, 3, false);//
            }
        }
        //*****************画表盘结束     

        Calendar now = Calendar.getInstance();
        hh = now.get(Calendar.HOUR);
        mm = now.get(Calendar.MINUTE);
        ss = now.get(Calendar.SECOND);

        int xs, ys;
        int xh[] = new int[4];//多边形时针的四个顶点横坐标
        int yh[] = new int[4];//多边形时针的四个顶点纵坐标
        int xm[] = new int[4];//多边形分针的四个顶点横坐标
        int ym[] = new int[4];//多边形分针的四个顶点纵坐标

        //    以下计算时针4个点的位置

        xh[0] = (int) (Math.cos((hh * 30 + mm / 2) * 3.14f / 180 - 3.14f / 2) * 35 + xcenter);
        xh[2] = (int) (xcenter - Math.cos((hh * 30 + mm / 2) * 3.14f / 180
                - 3.14f / 2) * 10);
        xh[1] = (int) (int) (Math.cos((hh * 30 + mm / 2) * 3.14f / 180) * 5 + xcenter);
        xh[3] = (int) (xcenter - Math.cos((hh * 30 + mm / 2) * 3.14f / 180) * 5);
        yh[0] = (int) (Math.sin((hh * 30 + mm / 2) * 3.14f / 180 - 3.14f / 2) * 35 + ycenter);
        yh[2] = (int) (ycenter - Math.sin((hh * 30 + mm / 2) * 3.14f / 180
                - 3.14f / 2) * 10);
        yh[1] = (int) (Math.sin((hh * 30 + mm / 2) * 3.14f / 180) * 5 + ycenter);
        yh[3] = (int) (ycenter - Math.sin((hh * 30 + mm / 2) * 3.14f / 180) * 5);

        //以下计算分针4个点的位置
        xm[0] = (int) (Math.cos(mm * 3.14f / 30 - 3.14f / 2) * 50 + xcenter);
        xm[2] = (int) (xcenter - Math.cos(mm * 3.14f / 30 - 3.14f / 2) * 15);
        xm[1] = (int) (int) (Math.cos(mm * 3.14f / 30) * 4 + xcenter);
        xm[3] = (int) (xcenter - Math.cos(mm * 3.14f / 30) * 4);
        ym[0] = (int) (Math.sin(mm * 3.14f / 30 - 3.14f / 2) * 50 + ycenter);
        ym[2] = (int) (ycenter - Math.sin(mm * 3.14f / 30 - 3.14f / 2) * 15);
        ym[1] = (int) (Math.sin(mm * 3.14f / 30) * 3 + ycenter);
        ym[3] = (int) (ycenter - Math.sin(mm * 3.14f / 30) * 4);
        //计算秒针位置
        xs = (int) (Math.cos(ss * 3.14f / 30 - 3.14f / 2) * 52 + xcenter);
        ys = (int) (Math.sin(ss * 3.14f / 30 - 3.14f / 2) * 52 + ycenter);

        g2.setColor(Color.black);
        g2.drawPolygon(xh, yh, 4);//画指针轮廓
        g2.setColor(Color.green);
        g2.fillPolygon(xh, yh, 4);//画指针
        g2.setColor(Color.black);
        g2.drawPolygon(xm, ym, 4);
        g2.setColor(Color.green);
        g2.fillPolygon(xm, ym, 4);
        g2.drawLine(xs, ys, xcenter, ycenter);
        if (now.get(Calendar.AM_PM) == Calendar.PM) hh += 12;

        if (mm < 10 && ss < 10) timeField.setText(hh + ":" + "0" + mm + ":"
                + "0" + ss);
        else if (mm > 10 && ss < 10) timeField.setText(hh + ":" + mm + ":"
                + "0" + ss);
        else if (mm < 10 && ss > 10) timeField.setText(hh + ":" + "0" + mm
                + ":" + ss);
        else if (mm > 10 && ss > 10) timeField
                .setText(hh + ":" + mm + ":" + ss);
    }

    public void start() //启动线程
    {
        if (timer == null)
        {
            timer = new Thread(this);
            timer.start();
        }
    }

    public void stop() //停止线程 
    {
        timer = null;
    }

    public void run() //每隔一秒钟，刷新一次画面
    {
        while (timer != null)
        {
            try
            {
                Thread.sleep(1000);
            }
            catch (InterruptedException e)
            {
            }
            repaint(); //调用paintComponent(Graphics g)方法重画时钟
        }
        timer = null;
    }

    public void mouseClicked(MouseEvent e)
    {
        int i = e.getX();

        if (i > 45 && i < 65) mode = 1;
        if (i > 65 && i < 85) mode = 2;
        if (i > 85 && i < 110) mode = 3;

    }

    public void mouseEntered(MouseEvent e)
    {
    }

    public void mouseExited(MouseEvent e)
    {
    }

    public void mousePressed(MouseEvent e)
    {
    }

    public void mouseReleased(MouseEvent e)
    {
    }
}