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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3answers
192 views

How do you get the best rendering performance in a 2D Java Game?

I have seen a lot of tutorials, and they develop games with 2 different ways: The first one is using a virtual image (BufferedImage) and filling it's pixels. And displaying virtual picture. private ...
2
votes
1answer
47 views

How to check/read multiple elements of the same arrayList at the same time in Java?

Im making an rpg game and right now I'm working on crafting. I've made a crafting slot class, and an arrayList of that class. I've got 10 of those slots in total, 9 placed in a 3x3 'order' and 1 below ...
2
votes
1answer
140 views

Efficient datastructure to store a galaxy map

I'm working on a project for an intro level Ai class, and the project I've closen is to create a simulated universe in which Ai actors play against each other economically and militarily. I have the ...
2
votes
1answer
119 views

Java LWJGL Windows 10 native files

Hello I made a simple game and I want to share it to my friend but he cant run it. I'm assuming it's because he has windows 10 and the LWJGL 2 native files don't support that (I've asumed that based ...
2
votes
2answers
82 views

How to stop Follow Path steering behavior when reached target?

I'm using libgdx Follow Path Steering Behavior in my top-down game. When unit reaches the end of the path, it goes to the start (not directly, but following path), then to the end and so on. How to ...
2
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1answer
86 views

How do I stop off-screen tiles of a 2D tilemap from being rendered?

I am seeing lag because I render all tiles in my map at once. How can I exclude off-screen tiles from being rendered? My tiles are 32×32 and my player is always in the centre of the screen. Here is ...
2
votes
1answer
114 views

convert mouse coords to zig-zag isometric

I was wondering, how do I convert mouse coordinates to zig-zag isometric coordinates? I already know how to convert to isometric using the Diamond approach, so I just need to know about the zig-zag ...
2
votes
1answer
210 views

Drawing textures off screen optimization required?

I recently started using LibGDX and I am wondering if I have to optimize my code when drawing textures/sprites off-screen, just like I used to do with XNA. My biggest concern here is specifically ...
2
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2answers
294 views

Swing GUI for games (performance) [closed]

I'm developing a game in Slick2D and I'm trying to make GUI. I've already tried TWL library, but it seems to me a bit complicated and it doesn't cover what I need. In my own implementation of GUI ...
2
votes
1answer
123 views

How can I repeat a Texture Region in libGDX

I have a texture that is part of a sprite sheet. I want draw the texture to cover a certain length, but I want it to repeat not stretch. However,when I use the following code batch.draw(hillBottom, ...
2
votes
1answer
76 views

Java: Problems with Tile Collisions

I have created a tiled map using a BufferedImage (img) from a PNG. From that, I would like to detect the player's (peter) collisions with individual tiles on the map. However, my code will not run and ...
2
votes
2answers
1k views

Load a simple text file through asset manager in libgdx

It's easy to load a simple text file from the internal: Gdx.files.internal("data/colors.txt"); But I currently use an AssetManager to load assets that are defined in an array of ...
2
votes
1answer
118 views

Java Libgdx: How do you add cells to a TiledMap?

I'm trying to make a Side-Scrolling game that will allow you to place/remove tiles. I'm using the TileMap Editor to render the custom Tilemap but is there any way to add tiles? I have it where I can ...
2
votes
1answer
247 views

How do I reverse “Cartesian->Isometric” function?

I'm working on an isometric tile rendering engine and I need to reverse a function I used to translate the Cartesian coordinates into isometric coordinates. I've already written a function for this, ...
2
votes
1answer
149 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
557 views

What version of OpenGL should I target for Steam?

I'm planning on developing a game (targeting towards PC and Linux) and putting it up on Steam in the future but I am not sure of what version of OpenGL to target so that the majority of steam users ...
2
votes
1answer
603 views

LibGDX scene2d good practices

I'm developing a game using LibGDX and in a part it has a pretty complex UI for profile selection and stuff. I have some general problems. I'd like to know good practices when generate good looking ...
2
votes
4answers
703 views

Android Game-Loop (rendering & logic removed, but still 'skipping frames')

Overview Guys really hoping for some help here. My game loop is based on code from Fix Your Timestep!. I've read the article more than a few times, but I can't quite work out what exactly is ...
2
votes
1answer
347 views

Drawing shapes and images in libgdx dialog

I am currently working on a dialog window for my android game using libgdx. This dialog window contains a collection of labels and buttons, but should also contain an image. The image represents the ...
2
votes
2answers
421 views

OpenGL generate hills looking vertices

I want to generate a terrain which looks like hills. Some sort of sine waves. Should be as simple as possible. But I can not figure out how. I get very scary results, which are nothing worth. I need ...
2
votes
1answer
240 views

Daily Unlock in LibGDX

I am trying to make a game that is a collection of mini games. The mini games will unlock daily. There are story for each day. And the story cannot be repeated so for example the player start playing ...
2
votes
1answer
472 views

Failing Screen Resize Method

So I want my game to draw to a specific "optimal" size and then be stretched to fit screens that are a different size. I'm using LibGDX and figured that I could just draw everything to a FrameBuffer ...
2
votes
1answer
229 views

libgdx arrays onTouch() method and delays for objects

I am trying to create random bullets but it is not working for some reason. also how can I make a delay so the bullets come every 30 seconds or 1 minute? Also the onTouch method does not work and it ...
2
votes
1answer
532 views

libgdx collision detection / bounding the object

i am trying to get collision detection so i am drawing a red rectangle to see if it is working, and when i do the code below in the update method. to check if it is going to work. the position is not ...
2
votes
1answer
247 views

Get the game state using Multithreading in Java Monkey Engine 3

I’ve been trying out Java Monkey’s multi threading recently via the wiki’s tutorial. Since I just wanted to test a prototype clinet, I made a program which creates some cubes using the ‘Cubes’ library ...
2
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1answer
941 views

How do I split a texture into differently shaped pieces with libgdx?

I want to split a texture into variously shaped pieces with libgdx, like the pieces of a puzzle game. TextureRegion.split() is not an option, as it splits into equally sized rectangular texture ...
2
votes
2answers
780 views

How can I create delays for sprite animations that work correctly when the application is killed and restored?

Please see my original question here: How should I use system time to compute delay times without stutters? In summary, I am attempting to to introduce a delay (say of 5 seconds or so) before a ...
2
votes
2answers
323 views

Expandable 2d environment by spawning and controlling individual tiles

what is the best way to implement an environment that is "expandable" in every direction so that when the player moves in any direction a new row or column of tiles that can be manipulated ...
2
votes
2answers
159 views

How do I create a horizontally centered “gravity line”?

Here's my ideal scenario: A game object (in blue) can change its horizontal velocity, but it will be pulled back by gravity (dotted gray arrows) toward a central vertical line (in red). How can I ...
2
votes
1answer
149 views

How can I extract the Geometry from a j3o file?

I created a blender file and then converted it into the j3o file. The only way to load the 3d structure in the game is through a Spacial object: Spatial towerModel = ...
2
votes
1answer
910 views

RTS Voxel Engine using LWJGL - Textures glitching

I'm currently working on an RTS game engine using voxels. I have implemented a basic chunk manager using an Octree of Octrees which contains my voxels (simple square blocks, as in Minecraft). I'm ...
2
votes
2answers
503 views

fast java2d translucency

I'm trying to draw a bunch of translucent circles on a Swing JComponent. This isn't exactly fast, and I was wondering if there is a way to speed it up. My custom JComponent has the following ...
2
votes
1answer
269 views

JBox2D Polygon Collisions Acting Strange

I have been playing around with JBox2D and Slick2D and made a little demo with a ground object, a box object, and two different polygons. The problem I am facing is that the collision-detection for ...
2
votes
2answers
291 views

Poor mobile performance when running from Eclipse

So after weeks of thinking my rendering code was bad, I accidentally discovered the following: Running my game on a Nexus S From Eclipse (Debug as -> Android application): 12fps From the device ...
2
votes
1answer
380 views

What concepts are used to procedurally generate video game content using music like in Audiosurf, Beat Hazard & Symphony?

I'm curious as to how video games like Audiosurf, Beat Hazard and Symphony procedurally generate content using music. What are the common concepts used to accomplish this? And in what way is the music ...
2
votes
1answer
944 views

LibGDX Scene2D event handling and bounding box relative to the center of a TextureRegion

I'm experimenting with Scene2D to see if it fits fot the game I want to develop. Say I have an Actor with the origin in the center of its TextureRegion. My setup method contains this code: float ...
2
votes
2answers
546 views

Split up a screen into regions

My task: I want to split up a screen into 3 regions for buffs-bar (with picked items), score-info and a game-map. It doesn't matter are regions intersect with each other or not. For example: I have ...
2
votes
1answer
700 views

Java network game - synchronize state

I'm creating a networked frame-based game (like Tetris battle), using the Java Sockets API, and right now my main concern is how to 'synchronize' the game state between two players. I've already ...
2
votes
1answer
2k views

How to scale openGL textures by a ratio based on height/width (or alternative)

I have been able to successfully allow my UI to extend over edges of my game on higher resolutions by using the Android Guide and by implementing this code on the GL10 object: ...
2
votes
1answer
209 views

Abstract Java game objects for Jython

I want to create an abstraction layer between my Jython Script objects and my Game Objects. I am not making the all of the engine in Jython. Most of my game logic is in Java. I just want to expose ...
2
votes
1answer
428 views

How do I make my camera follow a Box2D object?

I'm implementing a camera in my game. It worked for regular objects, but I began using Box2D and obviously things changed a bit. I have a Body object that I want to draw at the center of the screen. ...
2
votes
2answers
883 views

Why do my update and draw loops throw a concurrent access exception?

I've taken up the challenge of creating a basic 2D side-scrolling monster truck game for my little brother. It seems easy enough in theory, but jumping into Java out of XNA feels strange. My game ...
2
votes
1answer
618 views

Multiplayer in a game. How to design it object wise?

I was suggested on StackOverflow to ask this question here. I'm working on a simple game and I was thinking of adding multiplayer feature but I'm a bit stuck. I'm not sure what approach should I ...
2
votes
1answer
573 views

How to handle scripted events in a 2d java game?

I'm in the planning phases of a 2D java game. The game is a tile-based platformer with some action-y parts to it, like a Metroidvania formula game. The static portion of each stage is expressed as an ...
2
votes
1answer
1k views

libgdx collision/picking

I am trying to make something with java libgdx (2D). One thing that I can't figure it out is how to check mouse intersection with (fore example) isometric textures that are not rectangle shaped ...
2
votes
1answer
275 views

How to implement a multi-platform Java 2D game engine's graphics?

I'm not sure whether this question should be posted here. I'm trying to make a basic generic game engine in Java. Here's what I have so far. public abstract class Device { public abstract void ...
2
votes
1answer
1k views

Jogl2 won't accept jogl 1.0 code - GL_LIGHTING and GL_LIGHT_MODEL_AMBIENT cannot be resolved or is not a field?

I'm trying to run my code on jogl 2.0 , for the first time (until now I worked with jogl 1.0) however Eclipse throws to almost every that I have a "cannot be resolved or is not a field" message . ...
2
votes
1answer
550 views

MVC with looping view

For our school project we'd like to develop a game using the MVC pattern. We're all moderate new java programmers and absolutely new in game development. With our current view (containing only menu) ...
2
votes
1answer
218 views

Camera not strafing (GLSL)

I use this code in my GLSL vertex shader, where v_position is the vertex position: gl_Position = v_position * u_camera; and set u_camera as follows: meshShader.setUniformMatrix("u_camera", ...
2
votes
1answer
465 views

Android Virtual Pet Gameloop

Hello I'm looking for a bit of advice in which way is the best to proceed creating my applications 'gameloop' - It doesn't want to be a game loop in the truest sense since I'm not really rendering any ...