Java is both a popular programming language and runtime environment which allows Java programs to run unchanged on most hardware and software platforms.

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10
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3answers
995 views

Is there any relation between Game Theory and Game Development?

I'm a Java programmer interested to learn games on Java, recently I looked on a book on Operations Research written by Wayne L.Winston. There is a topic on Game Theory. It's truly mathematical. I'm ...
7
votes
5answers
1k views

How to save and restore Bullet Physics state?

I'm looking for information on how to save the runtime state of rigid bodies with Bullet Physics. Most of my world consists of static objects, but I have a few dynamic and kinematic objects as well. I ...
6
votes
2answers
7k views

Does Unity let you code in Java?

I am fairly new to Unity3D experience , but I have a very good knowledge of Java and Android development. I am really confused that if Java is at all needed for developing android applications? I read ...
5
votes
1answer
339 views

Move penetrating OBB out of another OBB to resolve collision

I'm working on collision resolution for my game. I just need a good way to get an object out of another object if it gets stuck. In this case a car. Here is a typical scenario. The red car is in ...
5
votes
6answers
2k views

Is it possible to use Java as a scripting language?

Is it possible to use Java as a scripting language for a C++ engine/game? I understand that you need to make a binding to the interpreter, but I haven't seen any around.
4
votes
1answer
4k views

The most efficient and accurate game loop?

Obviously for a game to work you need a game loop... Normally, my game loop would consist of something like this: while(running){ update(); render(); Thread.sleep(10); } This seemed to ...
4
votes
1answer
3k views

Access vertex data stored in VBO in the shader

If I wanted to store extra data in a VBO for skinning (indices for indexing into an array of matrices of bones and floats for applying weights to those bones) How would I go about accessing that data ...
3
votes
4answers
749 views

How do I apply different probability factors in an algorithm for a cricket simulation game?

I am trying to write the algorithm for a cricket simulation game which generates runs on each ball between 0 to 6. The run rate or runs generated changes when these factors come into play like skill ...
3
votes
0answers
931 views

How to make the background of an OpenGL object transparent? [closed]

It sounds so simple but i didn't get it to work. The Background of my FrameLayout where i add the GLSurfaceView in is colored blue but there is only black. So here is my method to initiate the ...
2
votes
4answers
378 views

Is it a good idea to make most actions in a game driven by simple tiny threads (in Java)? [duplicate]

I'm thinking of for example making the jump action of a character, that takes ~1s, a distinct runnable, so then other threads can read its state, with additional control over the action itself by the ...
2
votes
1answer
1k views

Maintaining velocity of free fall body using Box2D in libGDX

I want to maintain the speed of a free-falling Box2D body using LibGDX. I'd like the vertical velocity increase with the level. I've applied a linear impulse and velocity actually increases like this: ...
2
votes
2answers
2k views

How to check for cube collisions?

I want a method, which takes two "ObjectBox" objects (A "ObjectBox" has .getX() .getY() .getZ() .getSizeX() .getSizeY() .getSizeZ() methods) as a parameter and return true if the two Boxes are ...
2
votes
1answer
440 views

Camera scrolling and game boundaries

I am making a platformer game in JBox2D and LWJGL that has a scrolling camera, but I have hit a wall with the boundaries of the camera. Essentially what I have right now is a Box2D world that is ...
2
votes
5answers
2k views

How to Make Objects Fall Faster in a Physics Simulation

I used the collision physics (i.e. Box2d, Physics Body Editor) and implemented onto the java code. I'm trying to make the fall speed higher according to the examples: It falls slower if light object ...
1
vote
1answer
2k views

Handling multiple pressed keys with KeyListeners

I'm making a game Applet with Java that uses KeyListeners to control a paddle (for a game like Breakout/Pong). My basic implementation goes like this: public void keyPressed(KeyEvent e) { switch ...
1
vote
1answer
1k views

Java 2D Tile Collision

I have been working on a way to do collision detection forever, and just can't figure it out. Here's my simple 2D array: for (int x = 0; x < 16; x++) { for (int y = 0; y < 16; y++) { ...
1
vote
2answers
1k views

How do I set a single pixel of an image in Slick2D?

I would like to set an individual pixel in Slick (i.e Image.setPixel(x, y, r, b, g)) but I can't figure out how. There is an Image.setPixel function but it doesn't take x and y coordinates. Any ...
1
vote
2answers
1k views

2d very large tile based game, zoom and pan considerations

what's a sensible way of implementing zoom and panning for my game? each tile is very large, 100,000 x 100,000 pixels, with some objects possibly being only a single pixel at maximum zoom (small ...
0
votes
1answer
221 views

How to determine the distance between a point and a rotated rectangle

This question is very similar to How do I calculate distance from a point to a rectangle?. But that question assumes that the rectangle is axis-alligned, or not rotated. So just like in that ...
-1
votes
1answer
440 views

What is the best way to make UI for an Isometric game in java [closed]

What do you think is the best way to make UI for an isometric game.. I dont have much experience in UI so im not sure where to start. I need something the mouse can interact with and that works good ...
12
votes
2answers
1k views

How do I create a World Healing Wave effect?

I want to change my dark and depressing background to a happy grassy background, in real-time, such that the happy background is shown in a radius around a game character. A forcefield of happiness, ...
7
votes
2answers
1k views

Java single Array best choice for accessing pixels for manipulation?

I am just watching this tutorial https://www.youtube.com/watch?v=HwUnMy_pR6A and the guy (who seems to be pretty competent) is using a single array to store and access the pixels of his to-be-rendered ...
6
votes
3answers
3k views

GameState management hierarchical FSM vs stack based FSM

I'm reading a bit on Finite State Machines to handle game states (or screens). I would like to build a rather decent FSM that can handle multiple screens. e.g. while the game is running I want to be ...
6
votes
5answers
1k views

What is Java missing that might make it difficult to develop fully-featured 2D games?

Without using any external libraries, does Java, including all officially supported APIs give you enough to develop fully-featured 2D games? The reason I ask is that I hear a lot of "bad-mouthing" ...
5
votes
1answer
314 views

Implementing Vehicles in your game

In the game i am creating as an hobby (learning is the primal goal of it all) i plan to implement a space ship that the player can enter and use to explore it. I tried to search the internet for the ...
5
votes
1answer
1k views

What's the best way of drawing a glowing 3d line using LWJGL?

Sort of like a strip-light effect; not actually a light source, but just a polygon with glowing edges. Can this be done easily? Right now I'm contemplating drawing a line more than once with varying ...
4
votes
3answers
1k views

Tetris - Rotations using Linear Algebra (Rotation Matrices)

I'm making Tetris in Java and am at the point of rotations... Originally I was hardcoding each rotation: if (direction.equals("right")) { if (shape.equals("Bar")) { if ...
4
votes
2answers
613 views

Is it possible to compile an android game for pc desktop?

If I have an android game based on java native libraries. Is it to possible to compile into a windows/linux executable without a 3rd party emulator?
4
votes
3answers
4k views

How can I make my main character move in a parabolic arc when jumping?

I'm entering Android game development, and I already have a computer version of a game I want to publish. The thing is, I want to make this as good as it can be. With that said, I need a physics ...
4
votes
1answer
901 views

Scaling a game view with letterboxes?

I'm creating an Android game and I want everyone who plays it -- no matter the size or shape of their screen -- to see the same 480x800 playfield but, depending on the actual resolution of their ...
2
votes
1answer
39 views

Collision detection between axis-aligned bounding box and bitmap (pixel perfect) terrain

Working on a Worms-type game, I have my objects in bounding boxes and they sit on the pixel terrain. Currently I am able to successfully do the collision detection for objects when they enter the ...
2
votes
1answer
259 views

In Slick2D, how can I generate a 2D platformer map from an image?

I'm fairly new to game development. I've been messing around with Slick2D. My map consists of rectangular objects. I want to use an image to represent my map, similar to this: How could I generate ...
2
votes
4answers
2k views

How to find the entity I'm looking at?

I am currently making a mod for Minecraft but I have come to a stop because I am lacking in some knowledge. I need to get data for the entity I am looking at, which I believe requires the use vectors, ...
2
votes
3answers
1k views

Using random numbers with a bias

I appear to be awful at describing the question so I'll try and describe the problem. I want to add a random amount of heads to my creatures but I want to be able to determine several things. a) The ...
2
votes
2answers
2k views

Dynamically load images inside jar

I'm using Slick2d for a game, and while it runs fine in Eclipse, i'm trying to figure out how to make it work when exported to a runnable .jar. I have it set up to where I load every image located in ...
2
votes
5answers
956 views

Add delay between player jumps

I'm developing a platformer game and have implemented jumping for the player. The player is able to jump, but holding the up arrow causes the player to continuously jump. What would be the best way to ...
2
votes
1answer
232 views

Is using the applet class in a Java game a wise thing to do?

I am making an 2D multiplayer game in Java project, by using Java sockets and simple java.applet.* Our teacher told us to use J2EE concepts in the project. Do I have to use JSP? Is it better or ...
2
votes
1answer
956 views

2D bullet movement speed problem [duplicate]

Possible Duplicate: Moving from A(x,y) to B(x1,y1) with constant speed? My problem is that I can't get my bullet movement right. The current update code I have for it is: speedX = deltaX; ...
2
votes
1answer
948 views

Slick2D, Nifty GUI listeners problem

I'm trying to get Nifty GUI to work with Slick2D. So far everything is going great, except that I can't seem to figure out how to properly interact with the GUI. I'm trying the example in the nifty ...
2
votes
2answers
1k views

How should I do 3D games through Java on a mac? [closed]

I have been self-teaching myself Java on the mac mostly because the language is cross-platform. Recently, I have been only able to develop 2D games using the Graphics2D class. Now, I want to learn ...
2
votes
2answers
950 views

Tile based map and collision; getting stuck

I'm trying to make my character move around a tile map with collisions. Everything works fine except for one thing. I show you a picture with the problem: http://i.stack.imgur.com/ZWI7x.jpg That is, ...
1
vote
2answers
148 views

How do I limit the rotation speed of a mouse-following object?

I am trying to make a 2D top-down game where player controls a spaceship. The spaceship (a rocket) is just a sprite following the mouse cursor with a fixed speed and is always pointing toward the ...
1
vote
1answer
147 views

Why is there a huge update-delay in my client/server code?

I'm working on my Java game with Libgdx and having trouble with the network code. I can create a server, make multiple clients connect to it, but there is a huge delay between the player's input and ...
1
vote
1answer
61 views

In JBox2d when dragging a Body, why is the direction is flipped vertically?

Why is it when I drag a JBox2d Body with the mouse, the vertical component is flipped? e.g. If I drag down-right, the Body moves up-right. Is this expected behaviour, a bug in JBox2D, a Mac ...
1
vote
1answer
342 views

Restarting a libGDX game to apply changes to resolution

How can I restart a LibGDX game to apply certain changes to the game such as changes to the resolution (going from 1920X1080 to 1280X720), or changing full screen. Granted the resize(int width, int ...
1
vote
2answers
445 views

How to make an Actor follow my finger

I'm back with another question that may be really simple. I've a texture drawn on my spritebatch and I'm making it move up or down (y-axis only) with Libgdx's Input Handler: touchDown and touchUp. ...
1
vote
1answer
108 views

Electronic circuit simulator four-way flood-filling issues

I've made an electronic circuit board simulator which has simply 3 types of tiles: wires, power sources, and inverters. Wires connect to anything they touch, other than the sides of inverters; ...
1
vote
1answer
122 views

How should I go about protecting my script files?

I am working on a small multiplayer game with a whole bunch of scripting components. I know I can't store my files in plaintext otherwise anyone would be able to change the functionality of core ...
1
vote
1answer
106 views

How can I check for key releases between keyReleased callbacks?

Slick2D's Input class has a isKeyPressed() method that returns a boolean value according to whether the specified key has been pressed. I want to check if a key has been released in the same fashion. ...
1
vote
2answers
380 views

Movement doesn't look smooth (slight lag)

Currently I'm using a variable time step and when the FPS drops by even a small amount you can easily notice a slight lurch forward of the player. I'm making a platformer and I'm wondering whether I ...