animatordemo.java

一个可以获取系统当前时间的动画模拟时钟现示

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

public class AnimatorDemo extends Applet implements Runnable
{
    Thread timer;
    int lastxs,lastys,lastxm,
        lastym,lastxh,lastyh;
    SimpleDateFormat formatter;
    String lastdate;
    Font clockFaceFont;
    Date currentDate;
    Color handColor;
    Color numberColor;
    public void init()
    {
        int x,y;
        lastxs = lastys = lastxm = lastym = lastxh = lastyh = 0;
        formatter = new SimpleDateFormat ("yyyy EEE MMM dd hh:mm:ss ");
        currentDate = new Date();
        lastdate = formatter.format (currentDate);
        clockFaceFont = new Font("Serif", Font.PLAIN,14);
        handColor = Color.orange;
        numberColor = Color.blue;

        try {
            setBackground(new Color(Integer.parseInt(getParameter("bgcolor"),16)));
        } catch(Exception E) { }
        try {
            handColor = new Color(Integer.parseInt(getParameter("fgcolor1"),16));
        } catch(Exception E) { }
        try {
            numberColor = new Color(Integer.parseInt(getParameter("fgcolor2"),16));
        } catch(Exception E) { }
        resize (300,300);
    }
    public void plotpoints(int x0, int y0, int x, int y, Graphics g)
    {
        g.drawLine(x0+x,y0+y,x0+x,y0+y);
        g.drawLine(x0+y,y0+x,x0+y,y0+x);
        g.drawLine(x0+y,y0-x,x0+y,y0-x);
        g.drawLine(x0+x,y0-y,x0-x,y0-y);
        g.drawLine(x0-x,y0-y,x0-x,y0-y);
        g.drawLine(x0-y,y0-x,x0-y,y0-x);
        g.drawLine(x0-y,y0+x,x0-y,y0+x);
        g.drawLine(x0-x,y0+y,x0-x,y0+y);
    }
    
    public void circle(int x0, int y0, int r, Graphics g)
    {
       int x,y;
       float d;
       x=0;
       y=r;
       d=5/4-r;
       plotpoints(x0,y0,x,y,g);

       while (y>x)
       {
          if (d<0)
          {
             d=d+2*x+3;
             x++;
          }
          else 
          {
             d=d+2*(x-y)+5;
             x++;          
             y--;
          }
          plotpoints(x0,y0,x,y,g);
       }
    }
     
    public void paint (Graphics g)
    {
        int xh, yh, xm, ym, xs, ys, s=0, m=10, h=10, xcenter, ycenter;
        String today;
        currentDate = new Date ();
        SimpleDateFormat formatter =new SimpleDateFormat("s",Locale.getDefault());
        try {
           s = Integer.parseInt(formatter.format(currentDate));
        } catch (NumberFormatException n) {
          s = 0;
        }
        formatter.applyPattern("m");
        try {
            m = Integer.parseInt(formatter.format(currentDate));
        } catch (NumberFormatException n)  {
          m = 10;
        }
        formatter.applyPattern("h");
        try {
            h = Integer.parseInt(formatter.format(currentDate));
        } catch (NumberFormatException n) {
            h = 10;
        }
        formatter.applyPattern("EEE MMM dd HH:mm:ss yyyy");
        today = formatter.format(currentDate);
        xcenter=80;         
        ycenter=55;


        xs = (int)(Math.cos(s * 3.14f/30 - 3.14f/2) * 45 + xcenter);
        ys = (int)(Math.sin(s * 3.14f/30 - 3.14f/2) * 45 + ycenter);
        xm = (int)(Math.cos(m * 3.14f/30 - 3.14f/2) * 40 + xcenter);
        ym = (int)(Math.sin(m * 3.14f/30 - 3.14f/2) * 40 + ycenter);
        xh = (int)(Math.cos((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 30 + xcenter);
        yh = (int)(Math.sin((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 30 + ycenter);
 
        g.setFont(clockFaceFont);
        g.setColor(handColor);
        circle(xcenter,ycenter,50,g);
        g.setColor (numberColor);
        g.drawString("9",xcenter-45,ycenter+3);
        g.drawString("3",xcenter+40,ycenter+3);
        g.drawString("12",xcenter-5,ycenter-37);
        g.drawString("6",xcenter-3,ycenter+45);
        g.setColor(getBackground());
        if (xs !=lastxs || ys != lastys) {
           g.drawLine(xcenter, ycenter, lastxs, lastys);
           g.drawString(lastdate, 5, 125);
        }
        if (xm !=lastxm || ym !=lastym) {
           g.drawLine(xcenter, ycenter-1, lastxm, lastym);
           g.drawLine(xcenter-1, ycenter, lastxm, lastym); }
        if (xh !=lastxh || yh != lastyh) {
           g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
           g.drawLine(xcenter-1, ycenter, lastxh, lastyh); }
        g.setColor(numberColor);
        g.drawString("", 5, 125);
        g.drawString(today, 5, 125);
        g.drawLine(xcenter, ycenter-1, xs, ys);
        g.setColor(handColor);
        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);
        lastxs=xs; lastys=ys;
        lastxm=xm; lastym=ym;
        lastxh=xh; lastyh=xh;
        lastdate = today;
        currentDate=null;
    }
    public void start()
    {
         timer = new Thread(this);
         timer.start();
    }
    public void stop()
    {
        timer = null;
    }
    public void run()
    {
        Thread me =Thread.currentThread();
        while (timer == me) {
           try {
               Thread.currentThread().sleep(1000);
           }
           catch (InterruptedException e)  {
           }
           repaint();
        }
    }

    public void update (Graphics g)
    {
         paint(g);
    }
}