Java-Gaming.org Hi !
Featured games (83)
games approved by the League of Dukes
Games in Showcase (539)
Games in Android Showcase (132)
games submitted by our members
Games in WIP (604)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  Am I doing it right? and double buffering  (Read 919 times)
0 Members and 1 Guest are viewing this topic.
Offline MegaWolt

Senior Newbie




Java games rock!


« Posted 2005-04-22 17:06:07 »

Hi guys, I'm pretty new to programming, but I really want to make a game. I know this is a really easy question, but it is late, and I don't want to spend the next couple of hours doing something wrong. I want to move an object around with the keyboard, is this the best way of doing it? And how do I implements double buffering to avoid flicker?
1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
80  
81  
82  
83  
84  
85  
86  
87  
88  
89  
90  
91  
92  
93  
94  
95  
96  
97  
98  
99  
100  
101  
102  
103  
104  
105  
106  
107  
108  
109  
/**
 * Simple test of moving an objekt
 *
 * @author Lau
 * @version 0.1
 */


import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import javax.swing.*;

public class AnimationTest extends BasicJFrame implements Runnable
{
    private Ellipse2D.Double cirkel;
    private double xpos = 250;
    private double ypos = 250;
    private double rad = 25;
    private double xspeed;
    private double yspeed;
    private Thread animationThread;

    
    public AnimationTest()
    {
        super("Testarea", 500, 500);
        getContentPane().setBackground(Color.WHITE);
        
        addKeyListener(listener);
        
        xspeed = 0;
        yspeed = 0;
        
        setVisible (true);
        
        animationThread = new Thread(this);
        animationThread.start();
        
    }
    

    
    public void run()
    {
        while(Thread.currentThread() == animationThread)
        {
            xpos = xpos + xspeed;
            ypos = ypos + yspeed;
            
            repaint();
            try
            {
                Thread.sleep(10);  
            }
            catch(InterruptedException u)
            {
                System.err.println(u.toString());
            }
        }
    }  
    
    KeyListener listener = new KeyListener()
    {
        public void keyPressed(KeyEvent e)
        {
            int code = e.getKeyCode();
            
            switch(code)
            {
                case KeyEvent.VK_UP: yspeed = -3; break;
                case KeyEvent.VK_LEFT: xspeed = -3; break;
                case KeyEvent.VK_RIGHT: xspeed = +3; break;
                case KeyEvent.VK_DOWN: yspeed = +3; break;
            }
            
        };
        
        public void keyTyped(KeyEvent e)
        {};
    
        public void keyReleased(KeyEvent e)
        {
            int code = e.getKeyCode();
            
            switch(code)
            {
                case KeyEvent.VK_UP: yspeed = 0; break;
                case KeyEvent.VK_LEFT: xspeed = 0; break;
                case KeyEvent.VK_RIGHT: xspeed = 0; break;
                case KeyEvent.VK_DOWN: yspeed = 0; break;
            }
 
        };
    };
    
    public void paint(Graphics g)
    {
        super.paint(g);
        
        Graphics2D g2 = (Graphics2D) g;
        g2.setColor(Color.RED);
        
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                       RenderingHints.VALUE_ANTIALIAS_ON);
        
        cirkel = new Ellipse2D.Double(xpos - rad, ypos - rad, 2*rad, 2*rad);
            g2.fill(cirkel);
    }
}
Huh
Offline MegaWolt

Senior Newbie




Java games rock!


« Reply #1 - Posted 2005-04-22 17:11:41 »

Sorry I'll post this in Newless Clubies
Offline kevglass

« JGO Spiffy Duke »


Medals: 212
Projects: 24
Exp: 18 years


Coder, Trainee Pixel Artist, Game Reviewer


« Reply #2 - Posted 2005-04-22 17:14:32 »

Its probably fine here,

If you replace your repaint() with a repaint(0) things would work better. repaint() just schedules a repaint of the screen but that happens on a different thread at some point in the future. repaint(0) requests a repaint() within 0 milliseconds.

While this will probably work you'd be better to be using buffer strategies. At the risk of tooting my own horn, this tutorial might help:

http://www.cokeandcode.com/info/tut2d.html

Kev

Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline MegaWolt

Senior Newbie




Java games rock!


« Reply #3 - Posted 2005-04-22 17:42:31 »

Thanks, this link will answer a lot of questions  Grin
Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

rwatson462 (36 views)
2014-12-15 09:26:44

Mr.CodeIt (27 views)
2014-12-14 19:50:38

BurntPizza (61 views)
2014-12-09 22:41:13

BurntPizza (96 views)
2014-12-08 04:46:31

JscottyBieshaar (56 views)
2014-12-05 12:39:02

SHC (72 views)
2014-12-03 16:27:13

CopyableCougar4 (74 views)
2014-11-29 21:32:03

toopeicgaming1999 (134 views)
2014-11-26 15:22:04

toopeicgaming1999 (125 views)
2014-11-26 15:20:36

toopeicgaming1999 (35 views)
2014-11-26 15:20:08
Resources for WIP games
by kpars
2014-12-18 10:26:14

Understanding relations between setOrigin, setScale and setPosition in libGdx
by mbabuskov
2014-10-09 22:35:00

Definite guide to supporting multiple device resolutions on Android (2014)
by mbabuskov
2014-10-02 22:36:02

List of Learning Resources
by Longor1996
2014-08-16 10:40:00

List of Learning Resources
by SilverTiger
2014-08-05 19:33:27

Resources for WIP games
by CogWheelz
2014-08-01 16:20:17

Resources for WIP games
by CogWheelz
2014-08-01 16:19:50

List of Learning Resources
by SilverTiger
2014-07-31 16:29:50
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!