applet1.java~1~

用jbuilder开发的一个网络时钟

package webclock;

import java.util.Date;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class Applet1 extends Applet implements Runnable{
  private boolean isStandalone = false;
  //tianjia
  Date timenow;
  Clock myClock;
  Thread clockthread = null;
  //Get a parameter value
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  //Construct the applet
  public Applet1() {
  }
  //Initialize the applet
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception {
  }
  //Get Applet information
  public String getAppletInfo() {
    return "Applet Information";
  }
  //Get parameter info
  public String[][] getParameterInfo() {
    return null;
  }
  //run方法
  public  void  run(){
    while(true){
      repaint();
      try{
          Thread.sleep(1000);
      }
      catch(InterruptedException e){}
    }
  }
  public void start(){
    if(clockthread == null){
      clockthread = new Thread(this);
      clockthread.start();
    }
  }
  public void stop(){
    clockthread.stop();
    clockthread = null;
  }
  public void paint(Graphics g){
    timenow = new Date();
    myClock = new Clock(timenow.getHours(),timenow.getMinutes(),timenow.getSeconds());
    g.drawString(timenow.toString(),25,240);
    myClock.show(g,100,100,100);
  }
}
  class  Clock
  {
    Clock(int hrs, int  min, int sec)
    {
      hour = hrs%12;
      minute = min;
      second = sec;
    }
    void show(Graphics  g,int cx,int cy,int rad)
    {
      int hrs_len = (int)(rad*0.5),
          min_len = (int)(rad*0.6),
          sec_len = (int)(rad*0.9);
      double  theta;
      g.drawOval(cx-rad,cy-rad,rad*2,rad*2);
      theta = (double)(hour *60*60+minute*60+second)/43200.0*2.0*Math.PI;
      drawNiddle(g,Color.blue,cx,cy,hrs_len,theta);
      theta = (double)(minute*60+second)/3600.0*2.0*Math.PI;
      drawNiddle(g,Color.red,cx,cy,min_len,theta);
      theta = (double)(second)/60.0*2.0*Math.PI;
      drawNiddle(g,Color.green,cx,cy,sec_len,theta);
      }
      private void drawNiddle(Graphics g,Color c,int x,int y,int len,double theta){
        int ex = (int)(x+len*Math.sin(theta));
        int ey = (int)(y-len*Math.cos(theta));
        g.setColor(c);
        g.drawLine(x,y,ex,ey);
      }
      int hour,minute,second;
 }