package Forth;
//一个模拟时钟的程序，下面的是面板上的内容
import java.awt.*;
import java.util.*;
import java.util.concurrent.TimeUnit;

import javax.swing.*;

public class Clock extends JPanel implements Runnable {
    private JPanel numberPanel = new JPanel(); //用来绘制纯数字的时间
    private JLabel numberFormatLabel = new JLabel();//用来存放数字内容的Label
    private JPanel clockPanel = new JPanel();//用来绘制模拟时钟的面板
    private final Point R = new Point(230, 220);
    private final int RADIUS = 200;
    private final int SECOND_LENGTH = 180;
    private final int MINITE_LENGTH = 130;
    private final int HOUR_LENGTH = 100;
    private Point minute = new Point();
    private Point second = new Point();
    private Point hour = new Point();
    private Image offScreenImage = null;

    public Clock() {
        super();
        this.setLayout(new BorderLayout());

        numberFormatLabel.setFont(new Font("微软雅黑", Font.BOLD, 33));
        numberFormatLabel.setForeground(Color.pink);
        numberFormatLabel.setHorizontalAlignment(SwingConstants.CENTER);
        numberFormatLabel.setHorizontalTextPosition(SwingConstants.CENTER);
        numberPanel.add(numberFormatLabel);
        
        
        this.add(numberPanel, BorderLayout.NORTH);//存放数字的面板放在上面
        this.add(clockPanel, BorderLayout.CENTER);//存放模拟时钟的面版放在下面
    }


    @Override//绘制时钟的部分
    public void update(Graphics g) {
        super.update(g);
        if (this.offScreenImage == null) {
            offScreenImage = clockPanel.createImage(500, 500);
        }
        Graphics2D g2 = (Graphics2D) offScreenImage.getGraphics();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(Color.CYAN);
        g2.fillOval(R.x - this.RADIUS, R.y - this.RADIUS, this.RADIUS * 2,
                this.RADIUS * 2);
        g2.setColor(Color.green);
        g2.fillOval(R.x - 10, R.y - 10, 20, 20);
        g2.setColor(Color.red);
        g2.drawLine(R.x, R.y, second.x, second.y);
        g2.setColor(Color.BLUE);
        g2.drawLine(R.x, R.y, minute.x, minute.y);
        g2.setColor(Color.magenta);
        g2.drawLine(R.x, R.y, hour.x, hour.y);
        //paint(g2);
        g.drawImage(offScreenImage, 0, 0, null);

    }

    public void run() {
        while (true) {
            try {
                Date date = new Date();
                String timeStr = String.format("%tH:%tM:%tS %tp", date, date,
                        date, date);
                numberFormatLabel.setText(timeStr);

                Calendar calendar = Calendar.getInstance();
                int s = calendar.get(Calendar.SECOND);
                int m = calendar.get(Calendar.MINUTE);
                int h = calendar.get(Calendar.HOUR);
                                     //用来计算时钟的坐标
                System.out.println(s);
                second.x = (int) (R.x + this.SECOND_LENGTH
                        * Math.sin(s * Math.PI / 30));
                second.y = (int) (R.y - this.SECOND_LENGTH
                        * Math.cos(s * Math.PI / 30));
                minute.x = (int) (R.x + this.MINITE_LENGTH
                        * Math.sin(m * Math.PI / 30));
                minute.y = (int) (R.y - this.MINITE_LENGTH
                        * Math.cos(m * Math.PI / 30));
                hour.x = (int) (R.x + this.HOUR_LENGTH
                        * Math.sin(h * Math.PI / 6));
                hour.y = (int) (R.y - this.HOUR_LENGTH
                        * Math.cos(h * Math.PI / 6));

                this.update(clockPanel.getGraphics());
                TimeUnit.SECONDS.sleep(1);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}