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

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1answer
457 views

How to debug framerate drops with VBOs, OpenGL

I'm working on an experimental app to test how VBOs perform when rendering a minecraft-like world. If the performance is better than what I use now I'll update my actual game. Based on what everyone ...
6
votes
2answers
925 views

Scalability of multi-threading in game server

What is a reasonable number of threads for a simple 2D mmo in Java? Is it reasonable to have two threads per connection, one for the input stream and one for the output stream? The reason I ask is ...
6
votes
1answer
1k views

Method of terrain in a 3d RPG

I am working on a RPG using the JMonkey engine. While I was conceptualizing the map, I realized I would have a problem with the terrain. My problem is this: I want to have a click to move interface, ...
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votes
5answers
2k views

Do I really need to “learn” C# for XNA if I know Java?

I want to start developing in XNA. As of now, I do not know C#, but I would consider myself "good" at Java. I have looked at some C# code and it looks almost identical to Java. After looking at Java ...
5
votes
2answers
954 views

AI multithreading [closed]

MMO game. ~5000 (fake) players should be controlled by the server. Many of them have different classes -> different behavior. They should make some random pauses while doing some actions (~500-1500 ms)...
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3answers
2k views

Is this really the reason for smoother movement?

Actually i'm watching a tutorial series on youtube about 2D Game programming in Java. My question is about the player-movement. The first version: public void keyPressed(KeyEvent e) { ...
5
votes
2answers
1k views

One Dimensional Perlin noise vs Multi-Dimensional

I am reading through a book called "The Nature of Coding" and I am working on porting the examples from Processing.js to Regular old Java. The example I am on uses the following method call 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.
5
votes
3answers
314 views

Serialization of objects problem

i have a problem with serialization (saving and loading game variabiles), when i save evreything seems to be saving correctly but when i try to load it only detects first 3 objects i saved and the ...
5
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5answers
6k views

Is there a cross-platform special directory I can use for game save files?

I'm developing with LWJGL and Java on a Windows 7 laptop. I've successfully set up saving to the %appdata%\gamename\saves\ or long form c:\users\user\appdata\roaming\gamename\saves\ folder by using ...
5
votes
4answers
2k views

Drawbacks of using reflection for a component based system at loading-time

I'm coding a little casual game in Java using Slick2D. This game use a lot of different "objects", managed in a composite way. So, firearms, furniture in the map, NPC and player character will be ...
5
votes
2answers
624 views

Main game objects as static

I'm making a game for Android using Android Studio with Libgdx in Java. In my game there are main object like Screen, ObjectFactory, SoundPlayer, Painter (Responsible for drawing) and a few more. 'til ...
5
votes
2answers
2k views

Sprite batching in OpenGL

I've got a JAVA based game with an OpenGL rendering front that is drawing a large amount of sprites every frame (during testing it peaked at 700). Now this game is completely unoptimized. There is no ...
5
votes
2answers
2k views

How do MMO servers communicate with players who are behind a NAT?

I'm now planning to develop a real-time mmo in the future using udp as the transmission protocol since it has lesser overheads than tcp... I understand that between the client and the server, they ...
5
votes
3answers
746 views

Programming Languages Recommendations: A Space shooter game that allows two people to play [closed]

Do you remember an arcade game, that allowed two people to versus or play each other? It was a Galaga/Gradius type game. Me and a couple of other people I know want to make a game like this. We want ...
5
votes
4answers
3k views

Should each Entity have its own update and render methods?

First, the questions: Should each Entity (which are classes like Character, Tree, Enemy) have its own update() and render() methods? If that's the case, then should I use Interfaces like "Renderable"...
5
votes
4answers
878 views

How to avoid duplication using client-server model

I am using a client-server model to write a multiplayer-capable game (in Java). Currently the clients and the server are using the same code to run the game logic, in order to enable client-side ...
5
votes
4answers
1k views

Better way to generate enemies of different sub-classes

So lets pretend I have an enemy class that has some generic implementation and inheriting from it I have all the specific enemies of my game. There are points in my code that I need to check whether ...
5
votes
3answers
1k views

How can I change this isometric engine to make it so that you could distinguish between blocks that are on different planes?

I have been working on an isometric minecraft-esque game engine for a strategy game I plan on making. As you can see, it really needs some sort of shading. It is difficult to distinguish between ...
5
votes
2answers
1k views

How does this formula for generating water waves work?

I have been trying to implement the wave equation described in this paper ("Water Simulating in Computer Graphics," Kai Li and Liming Wu) in Java. Part of the paper discusses modeling waves as a sum ...
5
votes
2answers
1k views

3D models on 2D tilemap perspective when scrolling

I am creating a small top-down game, where the player traverses a 2D tilemap, with an illusion of depth provided by 3D models for things like buildings or trees. Having gotten to the point where I ...
5
votes
2answers
1k views

Is it legal to pack LibGdx libraries in my jar file? And to obfuscate them?

I'm using LibGDX and deploying a runnable jar file, using the Eclipse feature, with libraries extracted into it. There are also .so files and .dlls inside. Is it legal to do so? I didn't find ...
5
votes
4answers
360 views

What version of Java should I target for applets?

I recently deployed an applet that seems to require Java 6 Update 24. I assume the reason for this requirement is the matching JDK version I used to create the applet (I am new to Java). The fact ...
5
votes
1answer
119 views

On a 2D generated terrain what is the easiest way to pick tiles for the shoreline?

If I have a two-dimensional array with ones and zeros for water and land respectively how do I choose what shoreline tile to use according to the water and land tiles surrounding it? The shoreline can ...
5
votes
1answer
6k views

3D Camera Rotation

Please, forgive me, but I need help and I've been stuck on this for a few weeks now, I'm making no progress and everywhere I go and I see a different answer, everything I try doesn't work. I've had ...
5
votes
1answer
853 views

How do particle systems work?

I want to implement a particle system in my game, but I've never programmed a particle system and don't know where to start. I only want to display pixels (GL_POINTs) with different sizes in ...
5
votes
3answers
3k views

Android “Activities” — one or many for games?

I've been learning Android in my spare time, and one of the first things every tutorial/guide will introduce to you is the concept of an "Activity." Everyone loosely defines an Activity as a screen ...
5
votes
2answers
2k views

How to get smooth transition within slick?

When a player clicks start, my app immediately switches to the first level. My question is how do I incorporate a smooth transition within Slick?
5
votes
5answers
5k views

Checking validation of entries in a Sudoku game written in Java

I'm building a simple Sudoku game in Java which is based on a matrix (an array[9][9]) and I need to validate my board state according to these rules: all rows have 1-9 digits all columns have 1-9 ...
5
votes
5answers
8k views

Moving from XNA to Android

I've been using XNA to learn game programming for some time, and I'm interested in moving to Android. Having said that; the learning curve to get started seems to have ramped up exponentially. I ...
5
votes
5answers
621 views

How can I support retina graphics in libgdx?

I'm not sure if I'm missing it somewhere or if this just doesn't exist, but I'd like to support "retina" graphics on desktop displays that support them (like the newer MacBook Pro), but I can't find a ...
5
votes
1answer
3k views

Circle-Rectangle collision in a tile map game

I am making a 2D tile map based putt-putt game. I have collision detection working between the ball and the walls of the map, although when the ball collides at the meeting point between 2 tiles I ...
5
votes
3answers
2k views

How to Align Gun with Bullets

I have a top-down 2D shooter. I have an image of a player holding a gun, that rotates to face the mouse. Please note that the gun isn't a separate image tethered to the player, but rather part of the ...
5
votes
5answers
2k views

How to get more than one window in Java LWJGL

I'm trying to write a game in Java LWJGL. And I need more than one (multiple) display window. By default I've got one display window where I can draw everything. But I'd like to split some data to ...
5
votes
4answers
8k views

2D Platformer Collisions

I've basically asked this question before, and I know it's been asked probably a billion times, but I still can't seem to do it. All I want to know is how I should go about doing basic 4-way, ...
5
votes
2answers
1k views

Java game design question (graphical objects)

I'm beginner in game development, in Java and here on this site too and I have a game design question. Please comment my idea: I have a main loop which call update and draw method. I want to use an ...
5
votes
1answer
367 views

Neural Network ai evolution?

I've created a small simulation game and I have a basic neural network in place, each "creature" in my game has random weights on it's nodes and they all behave differently. Their goal is to stay ...
5
votes
1answer
3k views

How To Correctly Extend the Sprite Class in LibGDX

I am currently pursuing game development as a hobby, and have run into what seems to be a conflict in my mind regarding how to properly (using best practices) extend the Sprite class in LibGDX (or for ...
5
votes
4answers
13k views

How to add a scrolling camera to a 2D Java game?

I am attempting to create a game where the camera follows the player, always making sure the player is in the center of the screen. How would I go about this? This game is a 2D Java game, made with no ...
5
votes
2answers
189 views

Predicting Enemy Movement

Well I have a simple 2D game where all positions are defined by and X and Y coordinate. There are objects moving at a constant velocity. And a turret fires a bullet at the X and Y coordinates of the ...
5
votes
1answer
353 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
4answers
5k 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, ...
5
votes
4answers
808 views

Storing data for a pokemon like game

The game I'm developing is close to Pokemon. How should I store the data? I am currently thinking of text files where I save the map and have a corresponding textfile for the trainers and their teams ...
5
votes
2answers
4k views

How to detect a touch on transparent area of an image in a (libgdx) stage?

Can some one please help to detect a touch on an image which I am using as an actor in a stage. The image is actually a long diagnol brush which has plenty of transparent area. The problem is when I ...
5
votes
1answer
405 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
1answer
232 views

Should I amortize scripting cost via bytecode analysis or multithreading?

I'm working on a game sort of thing where users can write arbitrary code for individual agents, and I'm trying to decide the best way to divide up computation time. The simplest option would be to ...
5
votes
2answers
985 views

Are display lists faster than VBOs?

I'm making a voxel rendering engine. My "chunks" are 32 * 32 * 256 blocks and I can render a 16 * 16 square of them (which corresponds to Minecraft's maximal render distance). I'm using VBOs holding ...
5
votes
2answers
5k views

How would I implement procedurally generated tiles in libgdx?

I'm creating a simple top down Zelda-esque game in libgdx, and I want to implement tile-based dungeons that are procedurally generated, similar to this. Libgdx does have a class called TiledMap which ...
5
votes
2answers
612 views

Inventory Grid Detection

I'm working on creating an inventory system for a game. The inventory system will use cells and 2D images to represent items, like Minecraft, Diablo, or WoW. I've hit a bit of a snag when trying to ...
5
votes
1answer
6k views

Using the AssetManager in LibGDX

I am trying to use the AssetManager class in LibGDX and I understand how it works but I am trying to implement a loading screen. I have followed the AssetManagerTest.java file here, but I am having a ...