centerstring.java

Java2游戏编程源码 第三章 很好的学习Java和简单游戏编程的书籍

// 程序：居中显示字符串
// 范例文件：CenterString.java

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

public class CenterString extends Applet {
   FontMetrics FM;
   int Ascent, Descent, Width, 
       AppletWidth, AppletHeight, X, Y;

   public void init()
   {
      AppletWidth  = getSize().width; 
      AppletHeight = getSize().height; 
   }

   public void paint(Graphics g)
   {
      g.setFont(new Font("Courier", Font.BOLD, 32)); 

      FM = g.getFontMetrics();    

      Ascent = FM.getAscent();         
      Descent = FM.getDescent();       
      Width = FM.stringWidth("Game Over");

      X = (AppletWidth - Width) / 2;
      Y = (AppletHeight - (Ascent + Descent)) / 2 + Ascent;
          
      g.drawString("Game Over", X, Y); 
      g.setColor(Color.green);
      g.drawString("Game Over", X-2, Y-2); 
   }
}