extendtext.java

Java Applet实例讲解 N多例子

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

public class ExtendText extends Applet implements Runnable{
   private Image buffer;
   private Graphics gContext;
   private int width = 0, height = 0;
   private String param, words;
   private Thread thread;
   private int xpos = 0, ypos = 0, xw, xh;
   private int times = 0;
   private Font font;
   
   public void init(){
     
      font = new Font("TimesRoman", Font.BOLD,30);
      width = this.size().width;
      height = this.size().height;
      xw = width;
      xh = height / 3;
      ypos = xh;
      param = getParameter("words");
      if(param!=null)
         words = param;
      
      buffer = createImage(width,height);
      gContext = buffer.getGraphics();
      
   }
   
   public void start(){
      if(thread == null){
         thread = new Thread(this);
         thread.start();
      }
   }     
   
   public void update(Graphics g){
      paint(g);
   }
   
   public void paint(Graphics g){
         g.drawImage(buffer, 0, ypos, width, xh ,this);         
   }
   
   public void run(){
      int w, h, x, y;

     try{
        while(true){

           ypos = 0;
           xh = height;
           gContext.setColor(Color.white);
           gContext.fillRect(0 ,0, width, height);
           repaint();
           thread.sleep(100);
           if(times == 0){
              gContext.setColor(Color.blue);
              for(int i = width; i>=0; i--){
                 gContext.fillRect(i, height / 3 ,width, height /10);        
                 repaint();
                 thread.sleep(10);
              }
           }else if(times == 1){
              gContext.setColor(Color.pink);
              for(int i = 0; i<=width; i++){
                 gContext.fillRect(0, height / 3 ,i, height /10);        
                 repaint();
                 thread.sleep(10);
              }
           }

           ypos = height / 3;
           xh = height / 3;
           for(int i = height / 3; i>=0; i--){
              xpos = 0;
              ypos--;
              xh = xh + 2;
              if(times == 0){
                 gContext.setColor(Color.blue);
                 gContext.fillRect(0,0, width,height);
                 gContext.setFont(font);
                 gContext.setColor(Color.white); 
                 gContext.drawString(words,0,35);  
                 times++;
              }else if(times == 1){
                 gContext.setColor(Color.pink);
                 gContext.fillRect(0,0, width,height);
                 gContext.setFont(font);
                 gContext.setColor(Color.black); 
                 gContext.drawString(words,0,35);           
                 times=0;
              }
              
              repaint();
              thread.sleep(100);
              
           }
           thread.sleep(2500);
           
        }
     }catch(InterruptedException e){}
        
   }
   
}