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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2answers
90 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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3answers
324 views

Calculating Projectile Movement

I'm having some trouble putting together a method that will constantly move a "bullet" in the same direction accurately. Here is what I have so far public Vector3f moveFromPosition(Vector3f location, ...
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2answers
190 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 ...
3
votes
1answer
86 views

Texture loading: Everything at once OR un-/loading the needed assets? [duplicate]

Good evening. We've been developing quite a huge game for android on the basis of AndEngine. So we have a lot of assets to load, especially textures. At the moment everything (sound, textures etc) ...
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1answer
169 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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votes
2answers
736 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 ...
2
votes
1answer
669 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 ...
2
votes
1answer
154 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
271 views

When should I load assets for optimal performance?

I'm writing a game using LWJGL and Java, and was wondering if there were best practices for when to load resources. I have seen examples that load all resources when initializing the game (XNA), ones ...
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votes
1answer
87 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 ...
0
votes
1answer
25 views

How can I render a simple lattice in LibGDX?

I have searched all over, but I can't find what I think will be a simple answer. I am using Opengl ES 2.0, and LibGDX. I simply want to use GL_LINES primitives to create a lattice structure. I have ...
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0answers
56 views

Steering problem in 2d game

I am creating a little 2D non tiled top down game. The enemy uses steering behaviour for chasing player or wandering around, but I do not think my code is working as it should be. My problem is, the ...
0
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0answers
28 views

how to make a game object increase/decrease speed each time it touches the x and y edges

i am trying to make an object to invert its speed (increase/decrease) each time it touches the edge of the screen on either the x or y axis with javafx. public void Strategy(){ if ...
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votes
0answers
29 views

Is there a way to capture back button twice in same activity libgdx game

Can anybody tell me if there is a possibility to capture back button twice in same activity in libgdx. What i want to achieve is that if the user press back button once the game pause. if in the ...
0
votes
1answer
40 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 ...
0
votes
1answer
48 views

Update Loop in libGDX

I have a screen class in libGDX. In this screen, I want to change a sprite's texture a certain number of times before the screen changes to a different screen class. I tried having a for loop in the ...
0
votes
2answers
144 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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votes
1answer
36 views

How can I format the number of digits my stopwatch shows? [closed]

I have made a stopwatch that displays the time in seconds during my game in libgdx. At the moment it shows a bunch of digits after the decimal point as it runs. Does anyone know how to change it so it ...
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votes
1answer
91 views

minecraft source code for use in mods

So I am teaching a class where we will be using java to make minecraft mods. To keep things simple, we are using a third party program to set up the under-the-hood stuff for us (that way we don't have ...
0
votes
1answer
89 views

FBO and VBO for performance

I discovered VBO's recently and changed my code to use them instead of immediate mode. Now I'm rendering 25000 squares and it's really slowing down my FPS. If I drew all the squares VBO's to an FBO, ...
0
votes
1answer
82 views

How do I efficiently deal with entities moving between chunks?

I am working on a game in which entities need to be stored in chunks. This is the basic chunk format: public static Entity [row][column][entities] chunkEntities; However, some of my entities move. ...
1
vote
1answer
178 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 ...
1
vote
1answer
189 views

AI movement in 2D

I've got a prototype of a game I've been mocking up and found myself struggling to find a solution for AI movement in a 2D tile based game. Here's the issue: The player is free to roam throughout the ...
4
votes
6answers
1k views

Should my game handle collisions in the Player object?

I'm making a 2D platform game. Right now I'm just working on making a very generic Player class. I'm wondering if it would be more efficient/better practice to have an ActionListener within the Player ...
-1
votes
0answers
41 views

Problems with cube bouncing off walls [closed]

I've been making a game for some time and I need help with the bouncing off walls and players. public class Ball extends Entity { private final int WIDTH = 8; private final int HEIGHT = 8; ...
0
votes
0answers
58 views

drift/skid in topdown racer with libgdx/java [duplicate]

I'm trying to do a simple top-down racing game and is struggeling to get the steering right. At the moment I'm using a very simple steering and want to add some drifting to the car. I've read some ...
2
votes
1answer
462 views

How do I use a JBox2D ContactListener to check if my character is standing on the ground?

I want to know when my character is touching a wall or floor. I've had no luck searching for information on this. I saw a few things about ContactListeners and getContactList(), but I don't understand ...
0
votes
1answer
151 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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votes
0answers
54 views

Cross component communication -Java

I am making my first simple game engine and decided to go with a ECS (Entity component system) from inspiration from Unity. I spent quite awhile online trying to figure out how to implement it. I ...
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votes
1answer
38 views

Dragging an object and moving it back to it's original position on release?

I'm making a small game, and I'm trying to add this mechanic where if you click on an object and move it, then you release the object it will snap back to it's original position. Currently, each ...
1
vote
1answer
161 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 ...
0
votes
1answer
32 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
960 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
votes
1answer
76 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 ...
0
votes
1answer
83 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 ...
0
votes
1answer
58 views

Datastructure for infinite 2D map [duplicate]

I started a 2D Tilegame programmed with libgdx which needs potentially infinite tiles. That means when the player arrives the border of the map it should be possible to generate even more tiles. So a ...
0
votes
1answer
30 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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votes
1answer
49 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 ...
0
votes
1answer
56 views

Can Java be used for developing games for Android in Unity3D [duplicate]

I only know Java Programming Language and no other. Can I develop games for Android in Unity3D using Java?
1
vote
1answer
57 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 ...
0
votes
1answer
282 views

problem adding bumpmap to textured gluSphere in JOGL

I currently have one texture on a gluSphere that represents the Earth being displayed perfectly, but having trouble figuring out how to implement a bumpmap as well. The bumpmap resides in ...
1
vote
1answer
221 views

Design pattern for animation sequence in LibGDX

What design pattern to use for sequence of animation that involve different actor in libGDX. For example I am making a game to choose a wolf from a group of sheeps. The first animation played when the ...
0
votes
1answer
246 views

LWJGL: Camera distance from image plane?

Let me paste some code before I ask the question... public static void createWindow(int[] args) { try { Display.setFullscreen(false); DisplayMode d[] = ...
0
votes
2answers
45 views

Adjust bitmaps according to screen ratios on android

I always thought that pixels were square... it turns out i'm wrong, and I am quite worried by this. This means that if I draw a circle, it will be round on my screen but it could be an ellipse on ...
2
votes
4answers
365 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
2answers
216 views

How can I compute which chunk a coordinate is in?

I am working on a video game. Everything (terrain, entities, particles) is stored in 100 by 100 chunks. Here is the array structure for the chunks: public static final int chunkSize = 100; public ...
0
votes
0answers
53 views

Minecraft Server - Get list of online players (Java)

My question is: How do I get a list of online players, not the count of the online players, in Java? //So I could call... String[] players = getPlayers("fnaf.hosthorde.net"); That is how I'd like ...
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votes
1answer
67 views

Java LWJGL - How can I click to interact with objects?

I want to be able to click on a monster to walk to him and start attacking him. The part that doesnt make sense to me is the conversion between the mouse position, and the actual terrain position. ...
1
vote
1answer
45 views

How can I adjust my code to make the objects start dropping at a certain speed and then increase that speed over time?

I'm making a game in LibGDX where the player dodges falling objects. At the moment, my code makes each object (in this case 'DROPS') fall at random speeds. I'm wondering if anyone can suggest how to ...
0
votes
1answer
30 views

switch between player camera/non-camera positioning

Sorry if this sounds ambiguous. But I am writing a traditional top down game. And normally the player would be centered in the middle while moving the orthographic camera. However, I would like this ...