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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Help with Resolving Pixel Perfect Collision

Hi I'm having trouble resolving "Collision detection between axis-aligned bounding box and bitmap (pixel perfect) terrain on a Worms type game". (Read previous question to find more information about ...
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1answer
30 views

How and where to handle collisions? [Java] [duplicate]

Okay, so in my game I have a Level class, which hold an ArrayList of entities. In addition to this, I store the Player here (naturally enough). In my Entity class, I have a method which checks for ...
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1answer
90 views

Trying to add a feature to my (basic) level parsing algorithm - not sure how to (JAVA)

Right now this method goes through a list of GameObjects (e.g. JetPack, Platform) with their respective x and y positions in a text file called level1.txt: platform 840 280 platform 1130 280 coin ...
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1answer
46 views

Understanding HingeConstraint in jBullet

I'm using the java port of BulletPhysics engine jBullet. I'd like to make a joints between 2 triangles so that one edge of the first and one edge of the seconds act like a hinge. But I don't ...
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1answer
36 views

Handling collision with LWJGL rectangles

I'm testing collision with other rectangles so I can implement it into my current project. The problem is the rectangle starts at the right x and y, but I'm not sure where exactly they are. I'm pretty ...
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2answers
138 views

Where the physics should be put

I'm studying a book of artificial intelligence applied to games. It shows several algorithms for each argument (movements, path finding.. ecc). Unfortunately (but obviously) it does not explains how ...
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1answer
850 views

How handle nifty initialization in a Slick2D state based game?

I'm using Slick2D and Nifty GUI. I decided to use a state based approach for my game and since i want to use Nifty GUI, i use the classes NiftyStateBasedGame for the main and ...
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1answer
77 views

OpenGL multiple mesh management

I've been working on coding a new 3D engine in Java. For the moment at least I'm sticking to openGL... Currently I'm reworking how meshes get transformed and then drawn. ATM each mesh created has ...
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2answers
329 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 ...
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1answer
357 views

libgdx ActorGestureListener.pan() parameters not moving actor in smooth line

I override the pan method in ActorGestureListener to implement dragging actors in libgdx (scene2d). When I move individual pieces on a board they move smoothly, but when moving the whole board, the ...
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1answer
63 views

Passing of board data in board games

Every time I make board game, I am faced with a decision. I have classes for the board and/or game logic, and another for the UI. I don't know how I should pass the board data to the UI. I could make ...
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2answers
157 views

How should I access frame buttons from a controller in an MVC approach?

I'm developing an italian card game using the mvc pattern. I have the class GameFrame that contains the view. The user's card are buttons (JButton objects). I have 3 controllers: GameController: to ...
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2answers
402 views

Wall jumping collision detection anomaly

I'm creating a game where the player ascends a tower by wall jumping his way to the top. When the player has collided with the right wall they can only jump left and vice versa. Here is my current ...
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0answers
23 views

JBullet Only Updates Position when I update it in Code

The title is a bit weird...but here it goes: I have JBullet configured so that I can move things in my code, as the game tick structure is something like this (the update code located in ...
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1answer
45 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 convert it into a JBullet Transform. After that, I try to apply any movement to the JBullet ...
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3answers
4k views

How can I make my main character move in a parabolic arc when jumping?

I'm entering Android game development, and I already have a computer version of a game I want to publish. The thing is, I want to make this as good as it can be. With that said, I need a physics ...
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1answer
58 views

How to add a callback to addAction in scene2d

Sorry if this is a newbie question, I'm still learning libgdx. I'm using scene2d and I am trying to fade a tooltip into my scene and fade it out after 4.5 seconds. Everything is working in my code ...
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0answers
40 views

(LibGDX/JAVA) How can I get a rectangle to rotate with this pendulum so I can start detecting collisions?

One of the objects in my game is a pendulum that swings in a semi-circle. This is done by having an update() method like this: public void update() { angleAcceleration = +1.81 / length * ...
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43 views

Sprites not being rendered on screen change - Android Libgdx

In my game over screen for my Libgdx Android game I've the following code which starts a new game upon a screen touch. if(Gdx.input.isTouched()) { ScreenManager.setScreen(new ...
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2answers
698 views

Matrix rotation wrong orientation LibGDX

I'm having a problem with matrix rotation in libgdx. I rotate it using the method matrix.rotate(Vector3 axis, float angle) but the rotation happens in the model orientation and I need it happens in ...
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2answers
183 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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1answer
62 views

How do I make my main character move towards an object? LibGDX/Java

What I want to happen is for my player to bounce from spring to another. For example take the illustration below: Here's my code (what I've tried to do so far). This gets called in an ...
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1answer
46 views

Game lags when my player collides with a specific object (solution known, unsure how to implement)

I'm developing a game in Android using LibGDX (although this is more of a JAVA problem than an engine problem). My aim is to have my player bounce off one spring onto another that will eventually take ...
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1answer
34 views

Scrolling is going too fast

I used delta based off the LWJGL tutorials and it works (I get 16 or 17 delta) but everything is scrolling nonstop. Here's how I render things: public class Game { int camX; int camY; ...
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0answers
32 views

LibGDX Tiled Map - how to get embedded objects

I am using LibGDX to learn Game Development. I have reached the phase I am learning to use Tiled Maps. In Tiled map editor, there is a feature where we can pick a tile in the tile set, go to View -> ...
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13 views

Sequential Memory Game, Incrementing Images Showing all at Once not One at a Time

I am making a sequential memory game, each time a user gets the sequence correct an extra image is added to the sequence. The problem I am having is all the images flash at once not one at a time. For ...
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1answer
73 views

Is there any case to mix Android UI with LibGDX?

my question is about creating "non-playable" screens in games with the help of native android tools. For example, I have an Android LibGDX game (singleplatform), what should I use to provide start ...
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1answer
26 views

libGDX's 2D particle editor launching incorrectly

What's going on? Here's my process: I first right-click the referenced library for gdx-tools.jar in Eclipse: I then search for the particle-editor class: It opens successfully, but half of the ...
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2answers
83 views

Minesweeper number placement [closed]

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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1answer
36 views

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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0answers
16 views

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
47 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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1answer
109 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
170 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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2answers
295 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 ...
6
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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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0answers
45 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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50 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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0answers
36 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 ...
87
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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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0answers
13 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
33 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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49 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
61 views

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

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
14 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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1answer
67 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
38 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(); ...
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0answers
14 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
58 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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0answers
25 views

Can't perform normal jump after applying revolute joint

I have encountered the following problem: I have two PolygonShapes which I had connected with a RevoluteJoint. The first body is called square the second is called weapon, before connecting the two ...