clock.java

本人编写的java小程序

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


class RotateG
{
    private Graphics g;
    private int ox = 0;
    private int oy = 0;

    private double radians = 0.0;
    private double cos = 1.0;
    private double sin = 0.0;

    public RotateG(Graphics g)
    {
      this.g = g.create();
    }


    public void setOrigin(int x, int y)
    {
      ox = x;
      oy = y;
    }


    public void setAngle(double a)
    {
      radians = (a *  Math.PI) / 180;

      cos = Math.cos(radians);
      sin = Math.sin(radians);
    }
    
    public void setColor(Color c)
    {
      g.setColor(c);
    }

    public int rotate_x(int x, int y)
    {
      return ((int) (ox + x * cos - y * sin));
    }

    public int rotate_y(int x, int y)
    {
      return ((int) (oy + y * cos + x * sin));
    }

    public void drawLine(int x1, int y1, int x2, int y2)
    {
      g.drawLine(rotate_x(x1, y1),
                 rotate_y(x1, y1),
                 rotate_x(x2, y2),
                 rotate_y(x2, y2));
    }
    
    public void drawOval(int x, int y, int width, int height)
    {
      
      g.drawOval(x,y,width,height);
    }
    
    public void fillOval(int x, int y, int width, int height)
    {
     
      g.fillOval(x,y,width,height);
    }
    
    public void drawPolygon(int x[], int y[], int n)
    {
      int new_x[] = new int[n];
      int new_y[] = new int[n];

      for (int i = 0; i < n; i++)
      {
        new_x[i] = rotate_x(x[i], y[i]);
        new_y[i] = rotate_y(x[i], y[i]);
      }

      g.drawPolygon(new_x, new_y, n);
    }
    
    public void fillPolygon(int x[], int y[], int n)
    {
      int new_x[] = new int[n];
      int new_y[] = new int[n];

      for (int i = 0; i < n; i++)
      {
        new_x[i] = rotate_x(x[i], y[i]);
        new_y[i] = rotate_y(x[i], y[i]);
      }

      g.fillPolygon(new_x, new_y, n);
    }
    public void drawImage(Image img,int x, int y,ImageObserver observer)
    {
     
      g.drawImage(img,x,y,observer);
    }
  }			 
	
public class Clock extends Applet implements Runnable
{
  private Date date;
  private int iHour,iMinute,iSecond;
  
  private Thread thread = null;
  private Image offI,backG;
  private Graphics offG;
  private int ixHour[]={4,4,0,-4,-4}
             ,iyHour[]={0,-30,-35,-30,0}
             ,ixMinute[]={3,3,0,-3,-3}
             ,iyMinute[]={0,-45,-50,-45,0};
  
  public void init()
  {
    this.setLayout(null);
    
    date = new Date();
    SimpleDateFormat df = new SimpleDateFormat("'现在时刻' hh:mm:ss");
    String lasttime = df.format(date);
    
    offI = createImage(300,300);
    offG = offI.getGraphics();
    backG = getImage(getCodeBase(),"Clock.jpg");
    
  }
  
  
  public void start()
  {
    if(thread == null)
    {
      thread = new Thread(this);
      thread.start();
    }
  }
  
  public void run()
  {
    RotateG g = new RotateG(offG);
    
    while(true)
    {
      try
      {
        thread.sleep(1000);
        date = new Date();
        SimpleDateFormat df = new SimpleDateFormat("'现在时刻' hh:mm:ss");
        String lasttime = df.format(date);
        System.out.println(lasttime);
        iSecond = date.getSeconds();
        iMinute = date.getMinutes();
        iHour   = date.getHours();
        
        offG.setColor(Color.white);
        offG.fillRect(0,0,300,300);
        
        g.setOrigin(0,0);
       
        g.drawImage(backG,0,0,this);
        g.setOrigin(107,107);
        
        System.out.println(iHour);
        g.setAngle(iHour*30+iMinute*0.5);
        
        g.setColor(Color.green);
       
        g.fillPolygon(ixHour,iyHour,5);
        
        g.setAngle(iMinute*6);
        g.setColor(Color.red);
       
        g.fillPolygon(ixMinute,iyMinute,5);
        
        g.setAngle(iSecond*6);
        g.setColor(Color.blue);
        g.drawLine(0,0,0,-65);
        
        g.setColor(Color.black);
        g.fillOval(102,102,10,10);
        
        repaint();
      }
      catch(InterruptedException e){}
    }
  }
  
  public void update(Graphics g)
  {
    paint(g);
  }
  
  public void paint(Graphics g)
  {
    g.drawImage(offI,0,0,this);
  }

}