JavaSwing实现动态时钟

代码

package swing.table;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Line2D;
import java.util.Date;

public class Clock extends Canvas implements ActionListener {
    static JButton start = new JButton("开始");
    static JButton stop = new JButton("停止");
    Date date = new Date();
    Timer secondTimer;
    int hour,minute,second;
    Line2D secondLine,minuteLine,hourLine;
    int a,b,c;
    double[] pointSX = new double[60];
    double[] pointSY = new double[60];
    double[] pointMX = new double[60];
    double[] pointMY = new double[60];
    double[] pointHX = new double[60];
    double[] pointHY = new double[60];

    public Clock(){
        secondTimer = new Timer(1000,this);
        pointSX[0] = 0;
        pointSY[0] = -100;
        pointMX[0] = 0;
        pointMY[0] = -90;
        pointHX[0] = 0;
        pointHY[0] = -70;
        double angle = 6*Math.PI/180;
        for (int i = 0; i < 59; i++) {
            pointSX[i+1]=pointSX[i]*Math.cos(angle)-Math.sin(angle)*pointSY[i];
            pointSY[i+1]=pointSY[i]*Math.cos(angle)+pointSX[i]*Math.sin(angle);
            pointMX[i+1]=pointMX[i]*Math.cos(angle)-Math.sin(angle)*pointMY[i];
            pointMY[i+1]=pointMY[i]*Math.cos(angle)+pointMX[i]*Math.sin(angle);
            pointHX[i+1]=pointHX[i]*Math.cos(angle)-Math.sin(angle)*pointHY[i];
            pointHY[i+1]=pointHY[i]*Math.cos(angle)+pointHX[i]*Math.sin(angle);
        }
        for (int i = 0; i < 60; i++) {
            pointSX[i] = pointSX[i]+120;
            pointSY[i] = pointSY[i]+120;
            pointMX[i] = pointMX[i]+120;
            pointMY[i] = pointMY[i]+120;
            pointHX[i] = pointHX[i]+120;
            pointHY[i] = pointHY[i]+120;
        }
        secondLine = new Line2D.Double(0,0,0,0);
        minuteLine = new Line2D.Double(0,0,0,0);
        hourLine = new Line2D.Double(0,0,0,0);
        secondTimer.start();
    }
    public void paint(Graphics g){
        for (int i = 0; i < 60; i++) {
            int x = (int) pointSX[i];
            int y = (int) pointSY[i];
            if (i%5==0){
                g.setColor(Color.BLACK);
                g.fillOval(x-4,y-4,8,8);
            }else {
                g.setColor(Color.BLACK);
                g.fillOval(x-2,y-2,4,4);
            }
        }
        g.fillOval(115,115,10,10);
        Graphics2D g2 = (Graphics2D) g;
        g2.setColor(Color.BLACK);
        g.drawOval(20,20,200,200);
        g2.draw(secondLine);
        BasicStroke bs = new BasicStroke(3f,BasicStroke.CAP_ROUND,BasicStroke.JOIN_MITER);
        g2.setStroke(bs);
        g2.setColor(Color.pink);
        g2.draw(minuteLine);
        bs = new BasicStroke(6f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER);
        g2.setStroke(bs);
        g2.setColor(Color.cyan);
        g2.draw(hourLine);
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource()==secondTimer){
            date = new Date();
            String s = date.toString();
            hour = Integer.parseInt(s.substring(11,13));
            minute = Integer.parseInt(s.substring(14,16));
            second = Integer.parseInt(s.substring(17,19));
            int h = hour%12;
            a = second;
            b = minute;
            c = h*5+minute/12;
            secondLine.setLine(120,120,pointSX[a],pointSY[a]);
            minuteLine.setLine(120,120,pointMX[b],pointMY[b]);
            hourLine.setLine(120,120,pointHX[c],pointHY[c]);

            repaint();
        }
        if (e.getSource()==start){
            secondTimer.start();
        }
        if (e.getSource()==stop){
            secondTimer.stop();
        }
    }

    public static void main(String[] args){
        JFrame win = new JFrame("swing.table.Clock");
        JPanel jPanel = new JPanel();
        jPanel.add(start);
        jPanel.add(stop);
        Clock clock = new Clock();
        start.addActionListener(clock);
        stop.addActionListener(clock);
        win.add(clock,BorderLayout.CENTER);
        win.add(jPanel,"South");
        win.setVisible(true);
        win.setSize(246,300);
        win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        win.validate();
    }
}

效果