package MyLibraryok.MyMain;

import java.awt.*;

import javax.swing.*;
import java.util.Calendar;
import java.util.GregorianCalendar;

public   class ClockPanel extends JPanel implements Runnable{
    	Thread clock;
    public ClockPanel() {

		start(); //開始進程
    }

    /**
     * start
     */
    private void start() {
        if (clock==null){ //如果進程為空值
                        clock=new Thread(this); //實例化進程
                        clock.start(); //開始進程
                }

    }

    public void run() {
        while (clock!=null){
                repaint(); //調用paint方法重繪界面
                try{
                        Thread.sleep(1000);  //線程暫停一秒(1000毫秒)
                }
                catch (InterruptedException ex){
                        ex.printStackTrace();  //輸出出錯信息
                }
        }

    }
    public void stop(){  //停止進程
                clock=null;
        }

        public void paint(Graphics g){  //重載組件的paint方法
                Graphics2D g2=(Graphics2D)g;  //得到Graphics2D對象
                Calendar now=new GregorianCalendar(); //實例化日歷對象
                String timeInfo=""; //輸出信息
                int hour=now.get(Calendar.HOUR_OF_DAY); //得到小時數
                int minute=now.get(Calendar.MINUTE);   //得到分數
                int second=now.get(Calendar.SECOND);  //得到秒數

                if (hour<=9)
                        timeInfo+="0"+hour+":"; //格式化輸出
                else
                        timeInfo+=hour+":";
                if (minute<=9)
                        timeInfo+="0"+minute+":";
                else
                        timeInfo+=minute+":";
                if (second<=9)
                        timeInfo+="0"+second;
                else
                        timeInfo+=second;

                 g.setColor(Color.white);  //設置當前顏色為白色
//		Dimension dim=getSize();  //得到窗口尺寸
                g.fillRect(0,0,75,28);  //填充背景色為白色
                g.setColor(Color.black);  //設置當前顏色為橙色
                g.drawString(timeInfo,15,20);  //顯示時間字符串
        }


}