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[JAVA100例]029、绘制指针的时钟
作者:ljjk5 发表时间:2007-12-28 18:12 阅读:69次 在百度搜索相关内容

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.event.*;
import javax.swing.*;
import javax.swing.Timer;
/**
* <p>Title: 时钟</p>
* <p>Description: 本实例演示使用图形绘制一个图形时钟</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Filename: Clock.java</p>
* @version 1.0
*/
public class Clock extends JFrame implements ActionListener{
  Timer timer;
  int x,y,old_X,old_Y, r,x0,y0,w,h,ang;
  int sdo,mdo,hdo,old_M,old_H;
  TimeZone tz =TimeZone.getTimeZone("JST");
  final double RAD=Math.PI/180.0;


  public static void main(String[] args){
  Clock cl = new Clock();
 }
/**
*<br>方法说明:实现ActionListener类必须过载的方法
*<br>输入参数:
*<br>返回类型:
*/
 public void actionPerformed(ActionEvent e) {
      timer.restart();
  }
/**
*<br>方法说明:构造器,显示窗体,并添加了一个秒表
*<br>输入参数:
*<br>返回类型:
*/
 Clock(){
  super("Clock");
  setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
  setBackground(new Color(0,0,192));
  setSize(300,300);
  show();
  int delay = 1000;
  //窗体添加事件监听,监听秒表的触发
  ActionListener taskPerformer = new ActionListener() {
   public void actionPerformed(ActionEvent evt) {
     repaint();
   }
  };
  new Timer(delay, taskPerformer).start();
 }
/**
*<br>方法说明:绘制图形
*<br>输入参数:
*<br>返回类型:
*/
 public void paint( Graphics g ) {
  Insets insets = getInsets();
   int L0 = (insets.left)/2, T0 = (insets.top)/2;
   int hh,mm,ss;
   String st;
   h=getSize().height;
   //绘制圆形
   g.setColor(Color.white);
   g.drawOval(L0+30,T0+30,h-60,h-60);
   g.drawOval(L0+32,T0+32,h-64,h-64);
   r=h/2-30;
   x0=30+r-5+L0;
   y0=30+r-5-T0;
   ang=60;
   for (int i=1; i<=12; i++) {
    x=(int)((r+10)*Math.cos(RAD*ang)+x0);
    y=(int)((r+10)*Math.sin(RAD*ang)+y0);
    g.drawString(""+i,x,h-y);
    ang-=30;
   }
   x0=30+r+L0; y0=30+r+T0;
   //获取时间
   Calendar now=Calendar.getInstance();
   hh=now.get(Calendar.HOUR_OF_DAY);//小时
   mm=now.get(Calendar.MINUTE);//分钟
   ss=now.get(Calendar.SECOND);// 秒
   g.setColor(Color.pink);
   g.fillRect(L0,T0,60,28);//填充的矩形
   g.setColor(Color.blue);
   if (hh < 10) st="0"+hh;   else st=""+hh;
   if (mm < 10) st=st+":0"+mm; else st=st+":"+mm;
   if (ss < 10) st=st+":0"+ss; else st=st+":"+ss;
   g.drawString(st,L0,T0+25);
   //计算时间和图形的关系
   sdo=90-ss*6;
   mdo=90-mm*6;
   hdo=90-hh*30-mm/2;
   //擦除秒针
   if (old_X > 0) {
    g.setColor(getBackground());
    g.drawLine(x0,y0,old_X,(h-old_Y));
   } else {
    old_M=mdo;
    old_H=hdo;
   }
   //绘制秒针
   g.setColor(Color.yellow);
   x=(int)((r-8)*Math.cos(RAD*sdo)+x0);
   y=(int)((r-8)*Math.sin(RAD*sdo)+y0)-2*T0;
   g.drawLine(x0,y0,x,(h-y));
 
   old_X=x;
   old_Y=y;
   //擦除分针和时针
   if (mdo != old_M) {
    line(g,old_M,(int)(r*0.7),getBackground());
    old_M=mdo;
   }
   if (hdo != old_H) {
    line(g,old_H,(int)(r*0.5),getBackground());
    old_H=hdo;
   }
   //绘制分针
   line(g,mdo,(int)(r*0.7),Color.green);
   //绘制时针
   line(g,hdo,(int)(r*0.5),Color.red);
 } // end paint
/**
*<br>方法说明:绘制线,用于绘制时针和分针
*<br>输入参数:
*<br>返回类型:
*/
  public void line(Graphics g, int t, int n, Color c) {
   int [] xp = new int[4];
   int [] yp = new int[4];
   xp[0]=x0;
   yp[0]=y0;
   xp[1]= (int)((n-10)*Math.cos(RAD*(t-4))+x0);
   yp[1]=h-(int)((n-10)*Math.sin(RAD*(t-4))+y0);
   xp[2]= (int)( n  *Math.cos(RAD* t  )+x0);
   yp[2]=h-(int)( n  *Math.sin(RAD* t  )+y0);
   xp[3]= (int)((n-10)*Math.cos(RAD*(t+4))+x0);
   yp[3]=h-(int)((n-10)*Math.sin(RAD*(t+4))+y0);
   g.setColor(c);
   g.fillPolygon(xp,yp,4);
  }
}

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