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  java window slowdown  (Read 606 times)
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Offline nano

Junior Newbie





« Posted 2007-09-02 21:03:26 »

I am trying to figure out why this code cause the window responsiveness to become really laggy.

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import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;

import javax.swing.JFrame;
import javax.swing.JPanel;


public class GamePanel extends JPanel implements Runnable{
   
   private Game game = Game.getInstance();
   private Image buffer = null;
   private int width,height;
   
   public GamePanel(JFrame f){
      width = 650;
      height = 480;
      this.setBackground(Color.black);
      this.setPreferredSize(new Dimension(width,height));
      this.setDoubleBuffered(false);
      this.setFocusable(true);
      this.requestFocus();
      f.getContentPane().add(this);
      f.pack();
      f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   }
   
   /**
    * Main loop into game
    */

   public void run(){
     
      //create buffer
     buffer = createImage(width,height);
     
      while(!game.over()){
         game.update();
         game.render(buffer);
         paintScreen();
         //need frame rate control here
     }
     
     
   }
   
   
   private void paintScreen() {
      Graphics g = null;
      g = this.getGraphics();
      g.drawImage(buffer, 0, 0, null);
      Toolkit.getDefaultToolkit().sync();
     
   }
   
   
   public void paintComponents(Graphics g){
      super.paintComponents(g);
      if(buffer != null) g.drawImage(buffer,0,0,null);
   }
   
   
   public static void main(String[] args){
      JFrame jframe = new JFrame();
      GamePanel panel = new GamePanel(jframe);
      Thread game = new Thread(panel);
      game.start();
      jframe.setVisible(true);
   }
}
Offline cylab

JGO Knight


Medals: 34



« Reply #1 - Posted 2007-09-03 01:27:43 »

You are eating 100% CPU time in your game loop. Add a Thread.yield() or a Thread.sleep(10) to your while loop.

Mathias - I Know What [you] Did Last Summer!
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