myclock.java

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        paramString    = getParameter( "HOURCOLOR");
        if( paramString != null )
            hourColor=parseColorString(paramString);
		
        paramString    = getParameter( "TEXTCOLOR");
        if( paramString != null )
            textColor=parseColorString(paramString);
		
        paramString    = getParameter( "CASECOLOR");
        if( paramString != null )
            caseColor=parseColorString(paramString);
		
        paramString    = getParameter( "TRIMCOLOR");
        if( paramString != null )
            trimColor=parseColorString(paramString);
		
        logoString  = getParameter( "LOGOSTRING");
        if( logoString == null )
            logoString=JAVEX;
        else if(logoString.length() > 8)
            logoString= logoString.substring(0,8); //限制8个字母，否则显示不下!
		
        //szImagesURL数组根据HTML传入参数存放图片的文件名
        szImagesURL[BACKGROUND]  = getParameter("BGIMAGEURL");
        szImagesURL[LOGO] = getParameter("LOGOIMAGEURL");
		
        //测试图片
        for(int i=0; i<2; i++){
            if(szImagesURL[i] != null){
				//根据CodeBase参数与Image文件名得到image的路径，测试是否存在，如果不存在就不用图片
                try{
                    imagesURL[i]=new URL(getCodeBase(),szImagesURL[i]); 
                } catch (MalformedURLException e)
				{
					showURLerror(e);
					imagesURL[i]=null;
					images[i]=null;
				}
                if(imagesURL[i] != null){
                    showStatus("加载图片: " + imagesURL[i].toString());
                    images[i]=getImage(imagesURL[i]);
                    if(images[i] != null)
                        tracker.addImage(images[i],i);
                    showStatus("");
                }
                try{
                    tracker.waitForAll(i);
                }catch (InterruptedException e){}
            }
            else images[i]=null;
        }
		
        //得到相应时区的时间
        cur_time=(localOnly)? new Hms() : new Hms(tzDifference);
        lastHour=-1.0;
        lastMinute=-1;
        lastSecond=-1;
		
        x1=width/2;
        y1=height/2;
		
        //换算出圆形时钟在背景里的左上角坐标
        minDimension= Math.min(width, height);
        originX=(width-minDimension)/2;
        originY=(height-minDimension)/2;
		
        //计算出上面三角形的三个点的坐标
        xPoints[1]=x1-size(3); xPoints[2]=x1+size(3); xPoints[0]=x1;
        yPoints[1]=y1-size(38);yPoints[2]=y1-size(38); yPoints[0]=y1-size(27);
		
        //计算出秒针、分针、时针图形的各个点坐标
        sweep=new SweepHand(x1,y1,size(40),3);
        minuteHand=new HmHand(x1,y1,size(40),size(6),6);
        hourHand=new HmHand(x1,y1,size(25),size(8),6);
		
        //构造字体
        font=new Font("TXT",Font.BOLD,size(10));
		
        //构造缓冲区内图形
        offScrImage = createImage(width,height);
        offScrGC = offScrImage.getGraphics();
		
        System.out.println(getAppletInfo());
    }
	
    public void start() //开始启动显示线程
    {
        if(clockThread == null){
            clockThread = new Thread(this);
        }
        clockThread.start();        
    }
	
    public void stop() //停止显示
    {
        clockThread = null;
    }
	
    private void drawHands(Graphics g)
    {
		
        double angle;
        int i,j;
        int x,y;
		
        angle=MINSEC * lastSecond; //根据lastSecond算出秒针相对于12点刻度的角度
        sweep.draw(faceColor, angle, g);//画出秒针
		
        //如果时与分改变则重绘时针分针
        if(cur_time.getMinutes() != lastMinute){
            minuteHand.draw(faceColor,MINSEC*lastMinute,g);
            if(cur_time.get_hours() != lastHour)
                hourHand.draw(faceColor,HOUR*lastHour,g);
        }
		
        g.setColor(textColor);
        g.fillRect(originX+size(12),y1-size(2),size(10),size(4)); //绘制左侧横条
        g.fillRect(x1-size(2),originY + minDimension-size(22),size(4),size(10)); //绘制下面的横条
        g.fillPolygon( xPoints, yPoints, 3); //绘制顶部的三角形
        for(i=1;i<12;i+=3) //在表盘的2、3、5、6、8、9、11时针刻度区绘制圆
            for(j=i;j<i+2;j++){
                x=(int)(x1+Math.sin(HOUR*j)*size(35));
                y=(int)(y1-Math.cos(HOUR*j)*size(35));
                g.fillOval(x-size(3),y-size(3),size(6),size(6));
            }
			
			//设置字体
			g.setFont(font);
			FontMetrics fm=g.getFontMetrics();
			
			//画顶部的LOGO字符串
			g.drawString(logoString,x1-fm.stringWidth(logoString)/2,y1-size(12));
			
			//得到日期
			String day=Integer.toString(cur_time.getDate(),10);
			
			//将日期绘制在表盘右侧
			g.drawString(   day,
				originX + minDimension-size(14)-fm.stringWidth(day),
				y1+size(5));
			
			//外面画上框子
			g.drawRect( originX + minDimension-size(14)-fm.stringWidth(day)-size(2),
				y1-size(5)-size(2),
				fm.stringWidth(day)+size(4),
				size(10)+size(4));
			
			if(images[LOGO] != null){ //如果LOGO图片存在，在底部画出来
				x = originX + (minDimension-images[LOGO].getWidth(this))/2;
				y = y1 + (minDimension/2 - size(22) - images[LOGO].getHeight(this))/2;
				if(x > 0 && y > 0)
					offScrGC.drawImage(images[LOGO], x, y, this);
			}
			
			lastHour=cur_time.get_hours();
			hourHand.draw(hourColor,HOUR*lastHour,g); //画时针
			
			lastMinute=cur_time.getMinutes();
			minuteHand.draw(minuteColor,MINSEC*lastMinute,g); //画分针
			
			g.setColor(minuteColor); //绘制分针尾部的圆形
			g.fillOval(x1-size(4),y1-size(4),size(8),size(8));
			g.setColor(sweepColor); //绘制秒针尾部的圆形
			g.fillOval(x1-size(3),y1-size(3),size(6),size(6));
			
			lastSecond=cur_time.getSeconds(); //得到新的秒数，重画
			angle=MINSEC*lastSecond;
			sweep.draw(sweepColor, angle,g);
			
			g.setColor(trimColor);
			g.fillOval(x1-size(1),y1-size(1),size(2),size(2)); //秒针尾部圆心部分应该是螺丝，挖空处理^_^
    }
	
    private Color parseColorString(String colorString) //参数传入为字符串形(规定为16进制6位字符串)
    {
        if(colorString.length()==6){
            int R = Integer.valueOf(colorString.substring(0,2),16).intValue(); //前两位为R值
            int G = Integer.valueOf(colorString.substring(2,4),16).intValue(); //中间为G值
            int B = Integer.valueOf(colorString.substring(4,6),16).intValue(); //最后为B值
            return new Color(R,G,B); //得到COLOR
        }
        else return Color.lightGray; //字符串不符合规范，默认为灰色
    }
	
    public void run()
    {
        repaint(); //每次启动时首先重绘一次
        //每隔500ms获得现在时间并重绘一次
        while(null != clockThread){
            cur_time= (localOnly)? new Hms() :new Hms(tzDifference);
            repaint();
			
            try{
                Thread.sleep(500);
            } catch (InterruptedException e) {}
        }
    }
	
    public void paint(Graphics g) //首先绘制缓冲区内图片，再显示出来
    {
        int i,x0,y0,x2,y2;
		
        //如果没有提供背景图片，则用bgColor绘制背景
        if(images[BACKGROUND] == null){
            offScrGC.setColor(bgColor);
            offScrGC.fillRect(0,0,width,height);
        }
        else //否则直接使用背景图片
            offScrGC.drawImage(images[BACKGROUND], 0, 0, this);
		
        //绘制外框到表盘间的部分
        offScrGC.setColor(caseColor); 
		
        //将园形的范围适量缩减(不充满整个区域)，防止有些地方被截取
        offScrGC.fillOval(  originX+1,
			originY+1,
			minDimension-2,
			minDimension-2);
		
        //绘制表盘
        offScrGC.setColor(faceColor);
        offScrGC.fillOval(  originX + size(5),
			originY + size(5),
			minDimension - size(10),
			minDimension - size(10));
		
        //绘制外框线
        offScrGC.setColor(trimColor);
        offScrGC.drawOval(  originX+1,
			originY+1,
			minDimension-2,
			minDimension-2);
		
        //绘制内框线
        offScrGC.drawOval(  originX + size(5),
			originY + size(5),
			minDimension - size(10),
			minDimension - size(10));
		
        offScrGC.setColor(textColor);
		
        //画刻度，一共有60个刻度，x0、y0为刻度起始的位置，x1、y1圆心位置，x2、y2为刻度终止位置(x0<x2，y0<y2)
        for(i=0;i<60;i++){
            if(i==0 || (i>=5 && i%5 == 0)){ //每5格绘制一条长线(相对圆心)
                x0=(int)(x1+size(40)*Math.sin(MINSEC*i));
                y0=(int)(y1+size(40)*Math.cos(MINSEC*i));
            }
            else{ //其他部分绘制短线
                x0=(int)(x1+size(42)*Math.sin(MINSEC*i));
                y0=(int)(y1+size(42)*Math.cos(MINSEC*i));
            }
            x2=(int)(x1+size(44)*Math.sin(MINSEC*i));
            y2=(int)(y1+size(44)*Math.cos(MINSEC*i));
            offScrGC.drawLine(x0,y0,x2,y2);
        }
		
        drawHands(offScrGC); //绘制指针
        g.drawImage(offScrImage,0,0,this); //把生成的缓冲区图形绘制到页面上
		
        isPainted=true; //使下次UPDATE时不绘制表盘
    }
	
    public synchronized void update(Graphics g)
    {
        if(!isPainted)  //绘制表盘
            paint(g);
        else{    //已经绘制了表盘，只用绘制指针，首先在缓冲区内绘制，然后显示出来
            drawHands(offScrGC);
            g.drawImage(offScrImage,0,0,this);
        }
    }
}