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Simple Java timer lag issue (caused by quad core?)

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relequestual:
Hi everyone.
I've just finished my first term at uni, and learnt some java.
I'm creating a simple helicopter game in java, and have some issues using timers.
The funny thing was, i started the project on my laptop, and it was going fine. Went back to my desktop, and it lagged. Weird. So I tried it on my laptop again, and it had no lag.
By lag, I mean graphically and mouse movement when the application runs. Its not consuming resources, so that's not the problem.
I read something on a forum about it being to do with the fact my desktop has a quad core. If this is the case, how can I work around this? Obviously I will have to use my laptop for now. Laptop is dual core running vista, desktop is a quad core running xp sp3.
code listing below. 2 separate files but together for this forum

import javax.swing.JFrame;
import java.awt.*;

public class HeliApp extends Object
{   
   
   public static void main(String[] argStrings) throws Exception
   {
      JFrame frame = new JFrame ("Heli");
      frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add (new HeliPanel());   
      frame.pack();
      frame.setVisible(true);
   }
}

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.lang.*

public class HeliPanel extends JPanel
{   
   int heliX = 50;
   int heliY = 200;
   int yMove = 5;
   private ImageIcon image;
   int delay = 20;
   
   private Timer timer;
   
   public HeliPanel()
   {
   
      image = new ImageIcon ("../black-helicopter.gif");
      setBackground (Color.white);
      setPreferredSize (new Dimension(1000,400));
      setFocusable (true);
      
      Timer timer = new Timer(10, new GameListener());
      timer.start();
   }
   
   public void paintComponent (Graphics page)
   {
      super.paintComponent (page);
      image.paintIcon (this,page,heliX, heliY);
   }
   
   private class GameListener implements ActionListener
   {
      
      public void actionPerformed (ActionEvent event)
      {
         heliY = heliY + yMove;
         repaint();
      
      }
   }
}

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