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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One InputProcessor for two controllers

On my screen I want to display two controllers, one to turn around the character (We'll call itLook) and one to move the character (We'll call it Move). I have a line registering a ControllerListener ...
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2answers
137 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 ...
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1answer
198 views

Can I programmatically generate textures in java?

Is it possible to programmatically generate textures in Java, textures that could then be used to cover in game objects?
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2answers
189 views

Should game objects draw themselves? [duplicate]

Assuming you have classes like Player, Enemy, Map and Tile. The first approach to structuring rendering code would be to give each a render() method and let it draw itself: void render(){ ...
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1answer
72 views

Calculate The Proper X and Y Coordinate

I have a class called Tile, the constructor takes an integer that represents the tile's type. You can load a tileset ( via loadTileset() ) which initalizes the fields - tileset numOfTiles tileWidth ...
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1answer
75 views

Grid collision - finding the location of an entity in each box

I am trying to implement grid-based collision in a 2d game with moving circles. The canvas is 400x400 pixels. Below you can see the code for my Grid class. What I want it to do is check inside which ...
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2answers
141 views

Create a tornado like particle movement, based on velocity

For context i'm using Java and Minecraft Forge, however the concept should be fairly standard. To spawn particles you use this function... world.spawnParticle("largesmoke", posX, posY, posZ, ...
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2answers
70 views

How to calculate a bounding rectangle of a polygon?

Polygon poly = new Polygon(); poly.getPoints().setAll(5d, 15d, 15d, 25d, 5d, 30d); How do I calculate the Polygon's height and width? There is no poly.getWidth() or poly.getHeight() method in ...
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2answers
37 views

LWJGL Jumping Down [closed]

I'm currently building a little game using LWJGL, and I got a Game class which contains my game loop, instances etc... And a Player class which contains a constructor (for x and y coords), logic ...
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1answer
148 views

How do I move the camera in 2D LWJGL openGL?

I am making a top-down rpg game with the LWJGL but I can't figure out how to make the camera follow the player. I've tryed using GLU.gluLookAt() but it seems to be designed for 3D and when I try it ...
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1answer
139 views

Game Structure in depth [closed]

I've been curious about game structure for some time now. Does everyone who is a game programmer come up with there own approach to structure there game, or is there like some sort of defined layout. ...
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0answers
39 views

Lateral Friction Phisics

I am trying to create a physics engine for my game, and need to cancel out any lateral velocity for when entities turn. I have tried to mimic this page's example, but it is not working. I have objects ...
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2answers
83 views

Algorithmic error in tile engine? [closed]

I'm toying with creating a tile-based 2D java game engine. I can render the "local" area without issues(I.E. deciding which local tiles to render). The problem came when I introduced floating point ...
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0answers
45 views

Sound Effect Delay occurs when game is deployed with GWT backend?

I've been posting my games on to my personal website recently and I noticed a slight hiccups with the LibGDX games I've made. Within the first few seconds following the loading of the game, there is a ...
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votes
1answer
50 views

What do the 6 points stand for in Polygon().getPoints().setAll?

I have the following code to create a polygon: Polygon poly = new Polygon(); poly.getPoints().setAll(14d, 17d, 26d, 17d, 20d, 27d); // What do these mean? What do these 6 points stand for?
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3answers
72 views

Getting entity type object [closed]

I have a custom entity class and what it does is create a SQUARE object. public class Entity { Rectangle rect; public Entity() { this.rect = new Rectangle(20,20); rect.relocate(200,200); ...
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vote
1answer
64 views

Get Tile Location On Screen (Java Slick and Tiled2D)

I want to create a rectangle around each tile that's blocked value = true. How can I find the X and Y (on screen) coords of the each individual Tile?
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votes
1answer
85 views

How do you divide the screen into tiles? [closed]

I have been reading alot on tile-based game programming but i could not find a satisfying answer to this question. I want to know how i can divide the screen into tiles of a size like 32? I am doing ...
1
vote
1answer
222 views

3d Water Simulation formula questions

I have created a Grid: At each point along the grid, is a vertex (Intersection Points): Each of these points has an x,y,z position. Vector3f(x,y,z). In an attempt to animate the grid into a group ...
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2answers
79 views

What caused rotation in exported blender model to jMonkey? (OGRE)

First off, I am very new to jMonkeyEngine 3 and still learning. Not exactly sure what could be causing my snowman to have already been rotated before import. I created him in blender and it was facing ...
5
votes
2answers
365 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 ...
2
votes
1answer
142 views

Libgdx - Collision position - Box2D

I'm actually developping my own game but i'm facing a little problem. I trying to figured out how to get the position of a fixture (collision) between two entities. For example this : ...
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0answers
52 views

How should I model rotation caused by bounce friction? [duplicate]

In my Java2D simulation, I have a disc which, when it bounces off the boundary of a 2D region, begins to rotate, as if it had gotten some spin from the wall. I'm having trouble relating the ...
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votes
1answer
95 views

java tile based game :tile lag fix

hi I have a game where it reads a txt file and loads a map 0 represents air and 2 represents dirt I have a class for each tile as well as a tilemap I will show u my code. the problem is it lags like ...
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votes
1answer
76 views

Grid based Collision Detection between circles [duplicate]

I am working on a 2d arcade game where I have 5 types of circles with different sizes: The ship, the missiles, and 3 types of monsters. This is what it looks like: Currently I'm using brute force ...
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1answer
286 views

How to update libgdx scene2d Label text dynamically?

I display a BitmapFont on the screen, update its text and the font is updated dynamically on the screen as well. I seem to fail to do the same with a scene2d Label added as actor to a Stage. The ...
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0answers
47 views

Space invaders 2d array to represent scene [duplicate]

For code optimization purposes, I want to create a 2d array that contains 40 equal squares (10x10px). Each square represents 1\40 of the displayed window (400x400px). I populate the 2d array with the ...
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2answers
138 views

Game Design: Faction/Player circular relationship

For a Java game, say I have two classes: Player, representing a player in the game. Faction, representing a faction of players in the game. When the game starts up, all factions are loaded into some ...
11
votes
2answers
760 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, ...
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0answers
58 views

Window resizing doesn't work correctly

im currently having issues on resizing my game. It's a 2d Game and I want resizing to look a little(or exactly) like this: Original size: Smaller window size: My resizing function currently ...
2
votes
1answer
133 views

How to have the game world get rendered on just a part of the screen?

I am implementing a game on both Desktop and Android. The Desktop version will just rely on the keyboard to handle the user input on the game screen, whilst the Android one will have to have a set ...
4
votes
1answer
237 views

unable to launch LibGDX Particle Editor.jnlp

I am not able to launch LibGDX ParticleEditor.jnlp file on my system(win7 64 bit) with java7. when I execute this file with javaws.exe in jre7/bin folder, it displays splash screen of badlogic games ...
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0answers
24 views

Make QueryAABB touch in the center of a body to respond

I am allowing the user to drag their fingers to select bodies. The bodies are then added to a array list to be removed later. The problem is, i would like the users finger to have to cross the middle ...
0
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1answer
103 views

Game states vs calling new activities

I am trying to decide what the best method is to call "level complete-screen" and "game over-screen" in my real-time android 2d game. Currently I am using game-states and only updating my game when ...
2
votes
1answer
83 views

Invert Alpha on Image

I'm making a lighting system right now, and the last part I have to do is to invert the alpha channel on the final light map. My previous code that used to work was DataBufferByte buf = ...
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votes
1answer
96 views

How to swap the position of two sprites? [closed]

I'm making a game like Candy Crush with Cocos2D in Android. I've made the sprites but I want to swap to sprites by touch . How to swap the position of two sprites?
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2answers
83 views

How do I show a Quit button on Desktop but don't show it on Android with libgdx?

So I would like to display a Quit button on the Desktop main menu screen, but I wouldn't want to have it on Android too. What is the correct approach to achieve this? Do I have to check the ...
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0answers
57 views

Adding Sprite in 3d scene?

I want to add sprite in 3d, with object load with .g3db, I read some of topics here how can I use, but there is problem batch.begin(); Gdx.gl.glEnable(GL10.GL_BLEND); ...
2
votes
2answers
77 views

Why aren't resources such as Pixmap disposed on finalization in LibGDX?

I've been looking at the LibGDX framework, and certain classes such as Pixmap require to be disposed manually when you are no longer using them (call the dispose method). I'm wondering, since this is ...
0
votes
1answer
56 views

Universal Tween Engine: are accessor hierarchies possible?

Background: I'm using Universal Tween Engine, which allows generic accessors to be implemented to permit tweening of arbitrary atttributes. I have a hierarchy of game entity classes that share a ...
2
votes
1answer
62 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 = ...
0
votes
2answers
263 views

GameServer UDP or TCP Java [closed]

This is a Java related question. I've got this question and I searched on the internet but didn't really get any clear answer. I want to develop a little multyplayer game which needs real time ...
1
vote
1answer
319 views

Using Unity 3D in LibGDX

Is it possible to use Unity 3D engine with LibGDX when making Android game apps? Is it also possibly used for making 2D games using Unity 3D and LibGDX? I would like to know if it's possibly ...
1
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0answers
52 views

Does anyone know a good knockback algorithm? [closed]

I was just wondering if someone had a good knock back algorithm for a top down shooter game. I was hoping for not as much as a knock back but more of a push. that would be great.
0
votes
1answer
214 views

Android local multiplayer

I am working on a FPS game for Android and I want to make a support for local multiplayer with no additional devices or server required. One of the player's devices would serve as a server, getting ...
1
vote
1answer
110 views

How can I kill a libGDX AsyncTask immediately?

Is there any way of killing a running AsyncTask immediately in libGDX? The AsyncExecutor that submits it seems to just have one method (dispose()) that kills all the AsyncTasks that it handles after ...
0
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2answers
165 views

AndEngine - Smooth scaling on a sprite

I'm trying to implement a pinch zoom on a sprite. I would like to get an effect like the SmoothCamera, but on a single sprite. I've managed to pinch zoom on the sprite by changing its scale, but the ...
0
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0answers
54 views

Getting nearby entities with flixel-gdx

What's the easiest (while at least somewhat efficient) way to get FlxObjects within a certain range of a point or other FlxObject? e.g. I'm a monster NPC, are there any units within range I should ...
0
votes
1answer
110 views

Switching screens in a game

I am working on a simple 2D game in Java. I want the game to have an opening screen, instructions screen, and the screen with the game itself. From the opening screen the user presses buttons to get ...
0
votes
1answer
184 views

Java High-Resolution Timer for a simple game

I want to work on a model of some kind of simple shape shooter game I would develop for either the desktop or the Android, using the libGDX library. There's something I want to incorporate into the ...