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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Client code handling its own generics when returned by an engine

I'm writing a game engine in Java 8, and have prototype client code written in Groovy. New Game objects can be created with a builder which defines everything which fills in the blanks. To simplify ...
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Libgdx - How to change GestureListener pan finger sensibility?

I implemented GestureListener in my Overlap2dStage to pan the camera when the player drags its finger over the screen. But I also have some actors that extend InputAdapter to detect when the user ...
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1answer
26 views

(Java) Trying to animate an arraylist of coins with a (working) animation class

I have a coin class which takes in an integer numOfCoinsand an enum LayoutType, which can be linear or curved. A linear layout displays the coins in a straight line one after the other - we'll work ...
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14 views

JBullet move object rigidbody in code?

I am trying to move an object's Transform (of a coded class, these are for the rendering engine), then I am converting it into a JBullet Transform. Then, I try to apply any movement to the JBullet ...
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0answers
16 views

Java how to not place a block on top of another block?

Hello I have a game where you build ships you place blocks by left clicking your mouse. Everything works great in this game except you can place tiles on top of other tiles and I don't know how to ...
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1answer
84 views

Java Game How to find the x and y for a tile?

Hello I have a java game where you build houses I want to be able to dag my mouse form point a to point b and I want to fill that area with tiles when I release the mouse. What I cant do is get the ...
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1answer
141 views

How do I reverse this 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, ...
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1answer
134 views

Client side latency when using prediction

I've implemented Client-Side prediction into my game, where when input is received by the client, it first sends it to the server and then acts upon it just as the server will, to reduce the ...
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2answers
52 views

Minesweeper number placement [on hold]

My professor gave us a project: make a minesweeper clone. However, he said that he will give bonus points for the 3 fastest algorithms for board generation. I'm currently doing the algorithm that ...
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2answers
278 views

How could I implement 3D player collision with rotation in LWJGL?

I have a problem with my current collision implementation. Currently for player collision, I just use an AABB where I check if another AABB is in the way of the player, as shown in this code. (The ...
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3answers
1k views

Is it possible to implement Steamworks functionality in a Java game? How?

I have a basic game that I want to eventually turn into something better. The game is all Java as of right now, but I want to implement the Steamworks SDK into my game (so it can have achievements, ...
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41 views

Shooting game collision detection [on hold]

I am making a space shooting game. I have a player controlled spaceship, enemy spaceship and bullets, and maybe some additional interact-able entities. How should I handle collision detection? Should ...
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25 views

Using Box2D in LibGDX, is there a reason a fixture set to be a sensor would only -sometimes- detect a collision?

I am working on a 2D game in LibGDX. Currently, I am testing interactions between a player's weapon and enemies - in particular, a sword and an enemy monster. The player has a hurtbox and the sword ...
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1answer
89 views

Creating a separate renderer for entities in a 2D game

I'm making a 2D shooter game. As of now, every entity "draws itself", meaning every renderable entity has a draw function. I know it is better if rendering is handled separately, but how can I achieve ...
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2answers
124 views

Basic 2d platform collision detection algorithm has a slight bug (Java)

I'm trying to implement collision detection between Player (the main character) and a Platform. They are both modelled as rectangles; when player hits the side of a platform he should bounce off it ...
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2answers
65 views

How do I show damage to an enemy? [on hold]

I have a Player and an Enemy, both with damage values and health. I am trying to add something that will show how much damage is done to the Enemy with each attack. I want it to show above the Enemy, ...
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2answers
205 views

LibGDX how to change animations

I have a Player Class and i have 3 different Animations for it. I can render them perfectly but i don't know how to change from one animation to another. For exmaple i have 3 animations, one for ...
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2answers
883 views

libgdx actors and instant actions

I'm having trouble with actors and actions. I have a list of actors, they all have either no action, or 1 sequence action This sequence action has either : a couple of actions (some are instant, ...
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1answer
191 views

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

Overview Guys really hopeing 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 ...
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2answers
847 views

Java collision detection and player movement: tips

I have read a short guide for game develompent (java, without external libraries). I'm facing with collision detection and player (and bullets) movements. Now i put the code. Most of it is taken ...
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0answers
41 views

Trouble with Raycast Selection using OpenGL

I am currently having trouble with a custom model editor in which I want to implement model selection (eventually featuring face selection to have something like "click-and-drag" to extend the cubes). ...
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1answer
684 views

libGDX using Stage and Actor produces different camera angles on desktop and Android Phone

libGDX using Stage and Actor produces different camera angles on desktop and Android Phone. Here are pictures demonstrating the problem: http://brandonyuh.minus.com/mFpdTSgN17VUq On the desktop ...
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1answer
108 views

Multiplying by delta not giving smooth movement

I started working on my first proper game but reached a problem straight away. In short I have a game that runs most of the time at 60 fps. ( I am using Libgdx a popular Java framework) but my game ...
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0answers
17 views

Java Slick2D rotating a Shape using transform(Transform.createRotateTransform())

I have spent most of the day trying to debug this tiny piece of code, and I can't for the life of me figure it out. I'm making a pong game for the Mini Ludum Dare currently going on. I am programming ...
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1answer
25 views

LibGdx Table not firing touch events

I can easily add listeners to the actors within a table, and they will fire events, but if I want an entire to table to have 1 listener and do not care to have differentiated effects depending on ...
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34 views

SDL/SFML if i have only got experience in java? [on hold]

My question is, If i have a reasonable amount of experience in Java, would it be difficult for me to use a library like SDL or SFML. Should I learn more about c/c++ first or should I just jump in ...
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1answer
46 views

Animation fails due to a NullPointerException which I'm certain shouldn't be thrown (LibGDX / Java)

What the title says basically. I've been stuck on this error for a few hours I got it to work earlier but I honestly can't see why its failing now (ctrl + z'd back to the working stage). Here's my ...
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12answers
8k views

What data-type should I use for in-game currency?

In a simple business simulation game (built in Java + Slick2D), should a player's current amount of money be stored as a float or an int, or something else? In my use-case, most transactions will use ...
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2answers
157 views

get View from LibGDX for Android

I am making a LibGDX app, and I need to get the view to put to an Android app. Here is the code to get the view: package jangkoo.game.shadowfiend.android; import ...
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0answers
16 views

Lwjgl terrain generation [closed]

I am currently making a game and am wondering how one would go about making a terrain generator. Currently I have a mesh class to load all of the vertices and indices into, but how do I generate those ...
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0answers
11 views

Java how to fill a selected area with tiles [duplicate]

Hello this is my last try at asking this question because my other ones weren't great. I have a game where you build space ships. You can drag the mouse from one point to another and it will draw a ...
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0answers
16 views

java filling a rectangle with blocks [closed]

Hello I have a game like 2d space engineers where you place blocks to build a space ship I want to be able to drag my mouse from 1 point to another and be drawing rectangle in that area then when the ...
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24 views

OpenGL enabled Java game not detected by Fraps

Recently I found out that I could enable OpenGL hardware acceleration in my java game with the line System.setProperty("sun.java2d.opengl", "True"); Initial tests showed a big boost in performance. ...
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35 views

Dijkstra Pathfinding in Libgdx, some minor problems

I'm having some problems with my Dijkstra implementation in Libgdx. I understand that there are already AI libraries that can probably do this much simplier but this is a school assignment so i'm ...
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1answer
48 views

What is the difference between .obj files and Collada files? [on hold]

I am currently making a game in java using LWJGL 2.9 and I am wondering what the difference between the .obj format and .dae format is. Currently I can load .obj files and would like to load .dae ...
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0answers
85 views

In a 2D Java Swing game, how would I rotate my camera or map? [on hold]

I am creating a 2D Java game from scratch and would like to know how I would rotate my camera or map. The way my game works is it uses a raster image in which the pixel array is edited by the screen ...
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1answer
186 views

Structure gameobjects and call events

I'm working on a 2D tile based game in which the player interacts with other game objects (chests, AI, Doors, Houses etc...). The entire map will be stored in a file which I can read. When loading the ...
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0answers
13 views

get the closest points [duplicate]

Let's say I have a bunch of points: What is the best way to get a certain amount of closest neighbors. For example I wan't the 8 closest points for point no 57. This without using brute force. O ...
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0answers
20 views

java grouping blocks together to form one object [closed]

Hello I have a game like 2d space engineers where you place blocks to build a space ship I want to be able to see which blocks are connected to each other and be able to move them all together when I ...
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1answer
194 views

LibGDX Bounding Rectangles

I'm creating some rectangles surrounding my sprites for my player and bullet class to detect collisions with the overlaps method in Intersector class of LibGDX. I have a question: When I instantiate ...
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1answer
30 views

JNI multidimensional array as return value

I have some C++ code that I wrote to generate voxel terrain and would like to access it in JAVA. you pass it three integers; the seed and the coordinates of the chunk that it is generating ...
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1answer
36 views

Rotate heading relative to agent's local space

I'm having a little trouble translating a point in my game's world space to an object's local space. I have a cannon in my game with a normalized heading vector that's always supposed to point in the ...
3
votes
1answer
987 views

Libgdx - IsometricTiledMapRenderer and light shading

I am wondering if there is any way to simulate light shading in Libgdx using an IsometricTiledMapRenderer. Here is my code to draw an isometric map, it's able to be moved around with the mouse and ...
2
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2answers
90 views

Why do my Box2D bodies occasionally get stuck and separate forcibly?

I'm making a space game with LibGDX and Box2D. I made a video here to illustrate the issue. Verbal description: When objects collide, they sometimes get stuck together and are then suddenly separated ...
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1answer
31 views

OrthographicCamera and viewport not giving expected effect

I recently asked a question about this area that I think was too broad, so I will try a new approach. I have the following code I am experimenting with: batch = new SpriteBatch(); ...
0
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1answer
92 views

How can I make an soundsystem with slick?

My Question would be , how can I develop an easy-to-use Soundsystem under slick-util? Under the function a.playAsSoundEffect(1, 1, true, x, y, z); it allready works to create a static ...
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1answer
44 views

LibGDX - Executing 2 different touchDown events in the same method

On the bottom left of my screen is a circle with an Arrow and on the bottom right is a circle with a gun. If the player is in jetpack mode and the Arrow "button" is clicked he flies like flappy bird ...
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0answers
13 views

Stack matrix affecting shooting mechanics

I attempted to make a scroller game using parallax scrolling in LWJGL. Everything is fine but I'm having trouble with the matrix stack and the bullets. So basically when I shoot the bullet it moves ...
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1answer
52 views

How can I split up a large model into an octree codewise?

For collision detection, I am attempting to split up a large model into an octree. If we take this black thing thing to be the ship (104,000 vertices): Then I would like to split up the faces I ...
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1answer
55 views

box2d ChainShape into curved line

i need to draw a curved line , i searched the internet and found nothing , maybe someone with knowlegde on the subject can help me with a link , i used chain shape and did this , and i don't know ...