clock.java

这是一个用JAVA实现的十二生肖源程序,值得新手模仿

/* Clock.java */
import java.util.*;
import java.awt.*;
import java.applet.*;
import java.text.*;

public class Clock extends Applet implements Runnable {
  Thread timer = null;
  Image clockp, simgs[], animal[];	//clockp 钟面图像  simgs[]:钟摆图像数组
					//animal[]:整点时出现的动画 
  int s,m,h,hh;			// s秒   m分   h小时	
  AudioClip ipAu,towerAu;	//ipAu为每秒发出的声音   towerAu 为整点报时声音
  boolean canPaint=true;
  boolean flag=false;
  boolean strike=true;
  int counter=0;
  int lasts;

  Image offscreen_buf = null;
  Graphics offg;
 
  
  int i,j,t = 0;
  int timeout= 166;
  String img_name[]={"t0","t3","t2","t1","t2","t3",   //钟摆出现的顺序是t0 t3 t2...t5 t6 t5 t4
                     "t0","t4","t5","t6","t5","t4"};  //(钟摆的一个周期)
  String gif_name[]={"1","2","3","4","5","6",	      //整点动画的文件名		
                     "7","8","9","10","11","12"};

  int lastxs=0, lastys=0, lastxm=0, lastym=0, lastxh=0, lastyh=0;

  Date dummy = new Date();
  GregorianCalendar cal = new GregorianCalendar();
  SimpleDateFormat df = new SimpleDateFormat("yyyy MM dd HH:mm:ss ");
  String lastdate = df.format(dummy);
  Font F=new Font("TimesRoman",Font.PLAIN,14);
  Font S=new Font("宋体",Font.BOLD,90);
  Date dat = null;
  Color fgcol = Color.black;
  Color fgcol2 = Color.blue;
  Color white=new Color(255,255,255);
  

public void init() {
  ipAu=getAudioClip(getCodeBase(),"ip.au");             
  towerAu=getAudioClip(getCodeBase(),"TowerClock.au");

  offscreen_buf = createImage(700,500);
  offg = offscreen_buf.getGraphics();

  simgs = new Image[12];
  animal =new Image[12];
  int xcenter,ycenter,s,m,h;
  xcenter=315;
  ycenter=112;


  s = (int)cal.get(Calendar.SECOND);  		                 //初始化指针位置
  m = (int)cal.get(Calendar.MINUTE);
  h = (int)cal.get(Calendar.HOUR_OF_DAY);
    
  lastxs = (int)(Math.cos(s * 3.14f/30 - 3.14f/2) * 15 + xcenter);
  lastys = (int)(Math.sin(s * 3.14f/30 - 3.14f/2) * 15 + ycenter);
  lastxm = (int)(Math.cos(m * 3.14f/30 - 3.14f/2) * 13 + xcenter);
  lastym = (int)(Math.sin(m * 3.14f/30 - 3.14f/2) * 13 + ycenter);
  lastxh = (int)(Math.cos((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 9 + xcenter);
  lastyh = (int)(Math.sin((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 9 + ycenter);
  lasts=s;

  if(h<12) 
       if(h!=11) hh=h+1;
       else      hh=0;	 
  else 
       if(h!=23) hh=h-12+1;
       else      hh=0; 

  MediaTracker mt = new MediaTracker(this);
  
  for(i = 0; i<12; i++){
       simgs[i] = getImage(getCodeBase(),img_name[i]+".gif");
       mt.addImage (simgs[i],i);
  }
  clockp = getImage(getDocumentBase(),"clockp.gif");
  mt.addImage (clockp,i++);
  try{mt.waitForAll();} catch(InterruptedException e){};
//MediaTracker mt = new MediaTracker(this);
  for(j = 0; j<12; j++){
  	     animal[j] = getImage(getCodeBase(),gif_name[j]+".gif");
       	     mt.addImage (animal[j],j);
        }
  try{mt.waitForAll();} catch(InterruptedException e){};	

}

public void paint(Graphics g) {
  int xh, yh, xm, ym, xs, ys,strike_times;
  int xcenter,ycenter;
  String today;
  Integer gif_number;
  g.setColor(white); 
  g.fillRect(1,1,738,499);
    
  xcenter=315;
  ycenter=112;
  dat = new Date();
  cal.setTime(dat);
  s = (int)cal.get(Calendar.SECOND);
  m = (int)cal.get(Calendar.MINUTE);
  h = (int)cal.get(Calendar.HOUR_OF_DAY);
  today = df.format(dat);		//指针位置

  
  xs = (int)(Math.cos(s * 3.14f/30 - 3.14f/2) * 15 + xcenter);
  ys = (int)(Math.sin(s * 3.14f/30 - 3.14f/2) * 15 + ycenter);
  xm = (int)(Math.cos(m * 3.14f/30 - 3.14f/2) * 13 + xcenter);
  ym = (int)(Math.sin(m * 3.14f/30 - 3.14f/2) * 13 + ycenter);
  xh = (int)(Math.cos((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 9 + xcenter);
  yh = (int)(Math.sin((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 9 + ycenter);

  for(int loop=0;loop<100;loop++)
   {int x=(int)(java.lang.Math.random()*740);
    int y=(int)(java.lang.Math.random()*500);
    int red=(int)(java.lang.Math.random()*255); 
    int green=(int)(java.lang.Math.random()*255);
    int blue=(int)(java.lang.Math.random()*255);
    g.setColor(new Color(red,green,blue));
    if((red>70) &&(green>70)&&(blue>70))
    g.drawString("*",x,y); 
   
  } 

  g.setFont(F);
  
  lastxs=xs; lastys=ys;
  lastxm=xm; lastym=ym;
  lastxh=xh; lastyh=yh;
  lastdate = today;
  
  if(h<12) hh=h;
  else hh=h-12; 
  if(hh==0) strike_times=12; 
  else strike_times=hh;
 

  if((s==0 && m==0)||flag){                     //判断整点报时
                   if (counter<strike_times){
                       		flag=true;
		       		if( lasts != s){
                                	if(strike){
						counter++;
                                		towerAu.play();
					       }
                               		if (strike) strike=false;
					else strike=true;
					}
			         }
                    else  { 
			    counter=0;
			    flag=false;
                          }
                  }
   else
		if( lasts!=s) 
			ipAu.play();
       
   lasts = s;
 if(s<=20 && m==0)
   g.drawImage(animal[hh],390,105,this);
  
   if(canPaint){
		 t +=1;
		 if(t==12)t=0;
    	      }
  g.drawImage(simgs[t],270,140,this);    //画钟摆
  switch(t)
      {
        case 0: g.setColor(Color.black);
                break;
        case 1: g.setColor(Color.magenta);
                break;
        case 2: g.setColor(Color.blue);
                break;

      }
  g.setFont(S);
  g.drawString("大 摆 钟",155,380);
  for(int delay=0;delay<20000;delay++);
  g.setFont(F);
  g.drawImage(clockp,280,71,this);    //画钟面
  g.setColor(fgcol2);
  g.setColor(getBackground());
  g.setColor(fgcol2);
  g.drawString(today,275, 420);  
  g.drawLine(xcenter, ycenter, xs, ys);    //画指针
  g.setColor(fgcol);
  g.drawLine(xcenter, ycenter-1, xm, ym);
  g.drawLine(xcenter-1, ycenter, xm, ym);
  g.drawLine(xcenter, ycenter-1, xh, yh);
  g.drawLine(xcenter-1, ycenter, xh, yh);
  g.setColor(new Color(150,200,150));
 
   canPaint=false;
   dat=null;

}

public void start() {
  int i;
  if(timer == null)
    {
      timer = new Thread(this);
      timer.start();
    }
 }

public void stop() {
  timer = null;
}

public void run() {
  while (timer != null) {
       try {timer.sleep(timeout);} catch (InterruptedException e){}
    canPaint=true;
    repaint();
  }
  timer = null;
}

public void update(Graphics g){
    if (offscreen_buf == null){
       offscreen_buf = createImage(740,500);
    }
    offg.clipRect(1,1,739,499);
    paint(offg);
    g.drawImage (offscreen_buf,0,0,this);
  }
}