flyfont.java

java的一个小应用程序。呵呵

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

public class FlyFont extends Applet implements Runnable{ 
   
  private Image buffer; 
  private Graphics gContext; 
  private Font font; 
  private String string; 
  private Thread thread; 
  private int xpos, ypos, font_size; 
   
  public void init(){ 
   
     String param; 
     buffer = createImage(getSize().width, getSize().height);    
     gContext = buffer.getGraphics(); 
     param = getParameter("text"); 
     if(param == null) 
        string = "You Can Input The String That You Want"; 
     else string = param; 
      
     font = new Font("TimesRoman", Font.BOLD, 10); 
      
  } 
  public void start(){ 
     if(thread == null){ 
        thread =  new Thread(this); 
        thread.start(); 
     } 
  } 
   
  public void update(Graphics g){ 
     paint(g); 
  } 
  public void paint(Graphics g){ 
     gContext.setColor(Color.black); 
     gContext.fillRect(0,0,getSize().width, getSize().height); 
   
     font = new Font("TimesRoman", Font.BOLD, font_size); 
     gContext.setFont(font); 
     gContext.setColor(Color.yellow); 
     FontMetrics fm = gContext.getFontMetrics(font); 
     int font_height = fm.getHeight(); 
     int w; 
     int base_line = getSize().height / 2 + font_height / 2;       
      
     w = fm.stringWidth(string);       
     w = (getSize().width - w) / 2; 
      
     gContext.drawString(string, w, base_line-=20);    
     g.drawImage(buffer,0,0, this); 
     font_size++; 
      

  } 
   
  public void run(){ 
     while(true){ 
        repaint(); 
        if(font_size >getSize().height) 
           font_size = 0; 
        try{ 
           Thread.sleep(50); 
        }catch (InterruptedException e){} 
     }       
  } 
}