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Game Development / Newbie & Debugging Questions / Still Not Understanding the Whole "Fix" For Flickering Animation

on: 2012-03-03 21:39:36

I've now read at least 3 different tutorials on how to get rid of flickering animation, all using slightly different methods, and all making almost no sense to me. So alas, I am stuck with a broken game. So my question is, how do you guys personally get rid of flickering animation?

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public class Game extends Canvas implements ActionListener, KeyListener {
   
   Level level;
   Timer timer;
   Player player;
   boolean started;
   
   public Game() {
      started = false;
      level = new Level();
      level.constructLevel();
      player = new Player(150, 425);
      addKeyListener(this);
      player.genCollisionPoints();
      timer = new Timer(50, this);
      timer.start();
   }
   
   public void paint(Graphics g) {
      g.setColor(Color.GRAY);
      g.fillRect(0, 475, 1200, 25);
      
      for(int x = 0; x < level.map.size(); x++) {
         if(level.map.get(x).x >= -100)
            level.map.get(x).drawBlock(g);   
         else 
            level.map.remove(x);   
      }
      
      if(level.map.size() == 0)
         timer.stop();
            
      player.drawPlayer(g);
      
      for(int x = 0; x < player.health; x++) {
         g.setColor(Color.RED);
         g.fillRect(x * 30 + 15, 25, 25, 50);
      }
      g.setFont(new Font("Custom", Font.BOLD, 18));
      g.setColor(Color.BLACK);
      g.drawString(Integer.toString((int)player.score), 700, 25);
   }
   
   public void actionPerformed(ActionEvent e) {
      for(int x = 0; x < level.map.size(); x++) {
         if(collision(level.map.get(x).genRect()) && level.map.get(x).isExist()) {
            player.health--;
            level.map.get(x).setExist(false);
         }
         if(player.health <= 0)
            timer.stop();
         }
      
      for(int x = 0; x < level.map.size(); x++)
         level.map.get(x).x = level.map.get(x).x - 15;
      
      if(player.isJumping  && player.y > player.maxHeight)
         player.y -= 30;
      
      if(player.isJumping && player.y <= player.maxHeight)
         player.isJumping = false;
      
      if(!player.isJumping && player.y != 425)
         player.y += 30;
      
      if(player.y > 425)
         player.y = 425;
      
      player.score += .1;
      
      repaint();
   }
   
   public boolean collision(Rectangle rec) {
      boolean collision = false;
      player.genCollisionPoints();      
      for(int x = 0; x < player.xValues.length; x++)
         for(int y = 0; y < player.yValues.length; y++) {
            collision = rec.contains(player.xValues[x], player.yValues[y]);
            if(collision)
               break;
         }
      return collision;
   }
   
   public void keyTyped(KeyEvent e) {
      char pressed = e.getKeyChar();
      player.canJump = (player.y == 425);
      if(player.canJump && pressed == ' ')
         player.isJumping = true;
   }
}

2	Game Development / Newbie & Debugging Questions / Re: JFrame Size	on: 2012-03-02 04:56:51
Quote from: ra4king on 2012-03-02 03:42:16 Also, don't draw on a JPanel! I'm trying to eradicate this practice T____T What should I draw on then?

3	Game Development / Newbie & Debugging Questions / Re: JFrame Size	on: 2012-03-02 02:21:56
Wow, lots of replies! I'm not sure who's solution I like the best.

Game Development / Newbie & Debugging Questions / JFrame Size

on: 2012-02-29 21:47:27

I set the size of my JFrame to 1000x500 but it is obvious to me through the use of my drawing methods that the actual size is not 1000x500 but something slightly smaller. Why is this?

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JFrame frame = new JFrame("Jumper");
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.setSize(1000, 500);
frame.add(new Game());
frame.setVisible(true);

5	Games Center / Showcase / Re: TBS	on: 2012-02-23 21:50:27
Well I'm pretty much done with this project. Was a nice way to learn tile map system, packages, image/sound handling, writing custom algorithms, etc. The final jar's for both the game and the editor have been uploaded, links can be found in the original post. And you now have the option of using a custom map seed, so the editor actually has a purpose now. I'll only make changes if bugs are found or if I feel like adding something. If anyone would like to have the source code, for whatever reason, I'll upload it. Just make sure you give credit where due. Thanks for all the help on the final touches. I'll be starting a new project soon.

6	Games Center / Showcase / Re: TBS	on: 2012-02-23 04:54:04
Quote from: ra4king on 2012-02-23 04:27:28 That's because there is no AppletContext if you are adding it to the JFrame. Use the static "newAudioClip" method instead. You so smart!

Games Center / Showcase / Re: TBS

on: 2012-02-23 03:57:52

Is there a reason Java sucks at handling sound files? I have a copy of the sound files in my source folder, in their own source folder, in the package the class is in, and in the general project folder. Yet neither method of retrieving them works.
Huh

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System.out.println(Main.class.getResource("tank_fire.wav"));
System.out.println(Main.class.getClassLoader().getResource("tank_fire.wav"));

//tank_fire = getAudioClip(Main.class.getResource("tank_fire.wav"));
tank_fire = getAudioClip(Main.class.getClassLoader().getResource("tank_fire.wav"));
//both give the same error

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file:/H:/Eclipse%20Workspace/TBS/bin/com/rolledback/game/tank_fire.wav
file:/H:/Eclipse%20Workspace/TBS/bin/tank_fire.wav
java.lang.NullPointerException
   at java.applet.Applet.getAppletContext(Unknown Source)
   at java.applet.Applet.getAudioClip(Unknown Source)
   at com.rolledback.game.Main.declareImages(Main.java:102)
   at com.rolledback.game.Main.init(Main.java:62)
   at com.rolledback.game.Game_Frame.main(Game_Frame.java:18)

Games Center / Showcase / Re: TBS

on: 2012-02-22 21:45:22

So obviously this won't work since I'm no longer working in an applet:

1 2	tank_fire = getAudioClip(getCodeBase(), "tank_fire.wav"); tank_destroyed = getAudioClip(getCodeBase(), "tank_destroyed.wav");

But neither does this:

1 2	tank_fire = getAudioClip(Main.class.getClassLoader().getResource("tank_fire.wav")); tank_destroyed = getAudioClip(Main.class.getClassLoader().getResource("tank_destroyed.wav"));

I have used System.out.println() to confirm that the code is pointed to the correct file, yet I keep getting a null pointer exception.

Any ideas?

9	Games Center / Showcase / Re: TBS (working title)	on: 2012-02-22 21:11:30
Quote from: lordberzerker97 on 2012-02-22 06:15:11 How do you end turn? Either press "End Turn" or hit your space bar. I've also updated the JAR. Why is it that JFrame size and Applet size do not end up being equal?

Game Development / Game Play & Game Design / Taking Damage

on: 2012-02-21 07:06:39

Any suggestions on fair ways to calculate damage that isn't too complicated? At the moment I'm using:

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public void damaged(int amount) {
   Random random = new Random();
   double damage;
   int maxDef = defense + getDefBonus();
   double percMinus = random.nextInt(maxDef - (maxDef / 2)) + (maxDef / 2);
   damage = amount - Math.ceil(amount * (percMinus / 100));
   hp -= (int)damage;
   alive = hp > 0;
}

11	Game Development / Newbie & Debugging Questions / Re: Applet to Application	on: 2012-02-21 05:49:29
Thanks! http://www.java-gaming.org/topics/iconified/25799/view.html

Games Center / Showcase / TBS

on: 2012-02-21 05:45:32

This a continuation of the thread found here: http://www.java-gaming.org/topics/applet-to-application/25794/view.html

Simple turned based strategy game, still in development. My goal at the moment is to finish getting the UI sorted out. I'd like the info/dashboard thing at the bottom to be an independent window of the game screen. The would allow the player the ability the scroll around the game screen, which would also allow for any sized map, regardless of the user's screen size.

So if anyone has any ideas on how to implement this, I'm open to suggestions. I don't know much about java graphics aside from applets.

Game .jar file updated 2/23/12:
http://www.mediafire.com/?i6mid44e31i3x1m

Editor .jar file updated 2/23/12
http://www.mediafire.com/?ucpwfwukq20a1jc

Editor Controls:

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-Click on tile to cycle through terrain types
-Press key of first letter of tile type to fill map(ex, p, f, l, m)
-Space bar to change to base editing mode, allows you to place bases on first and last columns
-Right click to export map (need the 2 bases before you can export)

13	Game Development / Newbie & Debugging Questions / Re: Applet to Application	on: 2012-02-21 02:56:28
Quote from: UprightPath on 2012-02-21 02:51:24 Oh, I was talking about the image that you posted earlier. It looks like you're painting your water (With a slight transparency) on top of various other ground types (Plains, Plains with big, fluffy trees, Plains with conifers.) Oh no. That is showing you where you can move your unit. And since this thread is starting to move onto the general development of this game, I feel like I should start a new more permanent thread. What forum should I put it in?

14	Game Development / Newbie & Debugging Questions / Re: Applet to Application	on: 2012-02-21 02:46:45
Quote from: ra4king on 2012-02-21 01:53:27 Where's the JAR? Ok fine, I'll reupload it. The sounds have been removed since I can't figure out how to declare them in a way that won't give me errors and exceptions. I'll figure that out tomorrow. http://www.mediafire.com/?97kb0wayagm00rq Quote from: UprightPath on 2012-02-21 02:10:31 Just a quick question! Are those trees in the water? No they are islands. MS Paint is only so amazing.

15	Game Development / Newbie & Debugging Questions / Re: Applet to Application	on: 2012-02-21 01:37:08
Here's the jar file for anyone who wants to play around with this, comments and suggestions are appreciated. Bleh, having bugs with the sounds. I'll eventually reexport it. Too lazy though. So any ideas on how I could go about separating the dashboard looking thing from the map? I want to be able to have unlimited map sizes.

16	Game Development / Newbie & Debugging Questions / Re: Applet to Application	on: 2012-02-21 01:16:22
The project was started about a month and 2 weeks ago. All the artwork you see is original. I'm a senior in high school, so I'm pretty impressed on what I've been able to do with only 2 years of formal CS/Java and about a year of self taught under my belt. There is no animation though. I'll see if I can export it to an .exe and I'll put it on mediafire.

Game Development / Newbie & Debugging Questions / Re: Applet to Application

on: 2012-02-21 01:04:33

I LOVE YOU GUYS!

It took a bit of messing around, but the end result was this declaration:

1	plains1 = ImageIO.read(Main.class.getClassLoader().getResource("plains.png"));

I guess I didn't have to reference the folder the image was in. Applet runs great. Now I just need to separate the 2 parts of the game screen.

18	Game Development / Newbie & Debugging Questions / Re: Applet to Application	on: 2012-02-20 23:50:36
Did not solve the issue...could you maybe show me what you want with a screenshot, just in case I did not do what you meant?

Game Development / Newbie & Debugging Questions / Re: Applet to Application

on: 2012-02-20 23:29:48

Quote from: ra4king on 2012-02-20 23:22:12

Ah, then just do this: getImage(<ClassName>.class.getResource("plains.png"));

getResource returns a URL and searches for the file relative to the class.

Bleh, also does not work, it may have to do with how I've organized my images.

1	plains1 = getImage(Main.class.getResource("plains.png"));

http://gyazo.com/ed98477ac89861ff82e6c7cbef98e49a

Game Development / Newbie & Debugging Questions / Re: Applet to Application

on: 2012-02-20 22:58:46

Quote from: ra4king on 2012-02-20 22:50:17

Ah yes getCodeBase() won't work. Use System.getProperty("user.dir") instead.

1	plains1 = getImage(System.getProperty("user.dir"), "plains.png");

1	The method getImage(URL, String) in the type Applet is not applicable for the arguments (String, String)

PS: thank you for such patience

Game Development / Newbie & Debugging Questions / Re: Applet to Application

on: 2012-02-20 22:24:19

Ok did that, but I seem to be getting null pointer errors from a method that declares all my images and audio files:

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public void declareImages() {
      tr = new MediaTracker(this);
      
      tank_fire = getAudioClip(getCodeBase(), "tank_fire.wav");
      tank_destroyed = getAudioClip(getCodeBase(), "tank_destroyed.wav");
      
      plains1 = getImage(getCodeBase(), "plains.png");
      tr.addImage(plains1, 0);
      tiles[0] = plains1;

                //similar code below
}

EDIT: first of many errors

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Exception in thread "main" java.lang.NullPointerException
   at java.applet.Applet.getCodeBase(Unknown Source)
   at com.rolledback.game.Main.declareImages(Main.java:103)
   at com.rolledback.game.Main.init(Main.java:62)
   at com.rolledback.game.Frame.main(Frame.java:20)

22	Game Development / Newbie & Debugging Questions / Applet to Application	on: 2012-02-20 21:53:05
Hello, so after about a month of work I have created my first Java game on my own. It is a 2D turn based strategy, don't laugh too hard when you see it. Right now though it is run through an applet, but I wish to move it to a application before I continue with development. It's a lot of code so I've posted the source below [removed] if you care to take a look at it. I'm essentially looking to have the bottom 1/4 of the screen with all the info be static, while you could scroll around the actual game window. I know this might seem quite ambiguous, but if you run the applet I think you'll get what I'm saying. Also, willing to post pictures if needed. Thanks!

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