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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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
283 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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0answers
16 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
57 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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1answer
68 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
35 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 ...
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0answers
58 views

How do I make a Slick2D TextArea display newlines?

Whenever I press the Enter-key my Slick2D TextArea does not go to the next line. How can I make it do that? Here is the code that involves the TextArea: private TextField ta; public void ...
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0answers
26 views

LWJGL: getDisplayModes() on Linux with two monitors

When calling getDisplayModes() on a Linux machine with two monitors I only get one single resolution, that is, the current resolution set on the main monitor. However, calling xrandr directly gives me ...
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0answers
46 views

How to use Android Sensor, only in x axis

I have seen some tutorials but they are very complicated and they are about the three axes (x,y,z). So I want a code that moves an object or more (for example) to the right or the left when the ...
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1answer
54 views

java Move vehicle towards the mouse

Hello I have a game like asteroids and I have my ship on the screen and he points towards the mouse. I want to know how to move towards the mouse so if I press w I will drive towards the mouse and if ...
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0answers
8 views

Find fastest rotation left or right to face an object [duplicate]

im working on a competition where i am creating an AI for a game that the host has published and made for this event, i have two commands for turning my car and that is left and right, spinning on the ...
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2answers
63 views

How to make a proper cache on user computer?

Currently when launching the client of the game, it connects to the server and loads all the cachedata in a normal form (= folders, .txt files and .png files). However I don't like that the players ...
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2answers
186 views

LibGdx - Move sprite in the direction of other sprite

I'm kind new to LibGdx and I'm still learning. I'm working on a small game project to learn this nice framework. However, I'm having some issues with my game. My game is a top down shooter. There is a ...
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0answers
26 views

Libgdx. Sprite won't stop moving;

I can't stop a sprite from moving. Here's my code: boolean moving; Gdx.input.setInputProcessor(new Input(){ public boolean touchDown(int screenX, int screenY, int pointer, int ...
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1answer
145 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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0answers
180 views

Libgdx simple movement with velocity [closed]

Ok so this is driving me nuts. I've followed 3 tutorials now and I'm trying to get simple velocity to work and it just doesn't want to work for me. I have an open space and I want the character to be ...
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1answer
148 views

LibGDX Android Application only running once

I'm having trouble trying to figure out why my LibGDX game only runs successfully once on Android. Assuming the game has not been installed on the device, when I run the application from eclipse the ...
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0answers
119 views

Images not scaling properly in LibGDX when using “batch.setProjectionMatrix(camera.combined);”

I am trying to put Assets into my game but when i put in the line of code "batch.setProjectionMatrix(camera.combined);", which from my knowledge scales the Asset to the size of the window it appears ...
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1answer
57 views

LibGDX/Java - Trying to find the vector from one object to another

I want to add springs in my game that work like the ones in sonic - i.e. if you can't get over an obstacle you have to hit a spring which sends the main character flying towards another spring that ...
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2answers
145 views

How to build an AIManager class

I'm trying to figure out how to write a good AIManager class in Java in order to manage the AI of all the objects in my game. From another post of mine, an user has suggested to do the following: ...
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2answers
203 views

LibGDX - Best way of scrolling background

I'm new to LibGDX and i'm trying to implement a screen where i have a guy running and the ground under him scrolling to give impression he is really running in a sidewalk for example. The ground ...
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1answer
119 views

How can I store tile maps as PNG images?

I want to let players of my top-down game save, load and share worlds as PNG images. How do I read the colors in a PNG file or change them? I imagine something like this: BufferedImage mapImg = ...
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2answers
149 views

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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2answers
78 views

Delay in bullets

I made my character shoot but the amount of bullets he shoots is way too much. I'm trying to add a delay between bullets. I've tried this: int shootTime = System.currentTimeMllis(); public void ...
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2answers
104 views

Gradual rotation of an object in Java

I'm using Java to learn some movement algorithm. I would like to implement the "wandering" algorithm, but in order to do it, i should understand how to rotate an Object gradually. Actually, my Player ...
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1answer
51 views

Sprite movement only works the first time, can't figure out why [closed]

In my libGDX game I have finally managed to get the sprite to move the way I want him to but for some reason my desired outcome only works the first time I run the code. If I try to run it again, he ...
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1answer
71 views

How does one write a wrapper for a game server? [closed]

From what I gathered, wrappers mimic the game server in question, receiving packets from client and sending them to the server (and vice versa). It acts like a bridge between the client and server, ...
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3answers
213 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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2answers
274 views

Are shaders the only way to implement 2d lighting?

I'm working on a 2d top down game with libgdx and I think i got the basics. No want I want to implement lighting, I don't know anything about lighting. I want just to have some light sources and ...
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0answers
40 views

Box2D replace Fixture not working as expected

I am using box2D to develop a simple game, and I am using the Physics body editor by Aurelien Ribon to load the fixtures into bodies. I have written the following method which should scale my ...
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2answers
134 views

Libgdx: different speed on different devices

I am running a simple Libgdx app that I have wrote, on my Android phone and Android tablet and I am getting the unexpected result of having different velocities when a body is moved. To move the body ...
2
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4answers
200 views

How can I avoid sending the full game state so often?

I'm making a real-time 2D MMORPG in Java. Currently data all surrounding NPCs' and players' data is sent so frequently that the client crashes—it can't handle the data quickly enough. I'm sending data ...
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2answers
188 views

Breakout Collision Detection: Ball gets trapped inside block

I'm writing a breakout clone where blocks to hit can be of various sizes and the projectile can move at different speeds, and I seem to be having some trouble getting the collision detection perfectly ...
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1answer
121 views

How can I split my entity manager class into a gameworld class and gamerenderer class?

I currently have a libGDX game where I have an entity manager class which is called in the gamescreen. Instead, I would like to utilise it in a gameworld class and a gamerenderer class, but I cannot ...
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0answers
157 views

save and view snapshot image from android device

I'm having a problem with saving image into an android device this is what i did My java class : package com.test.app; import com.unity3d.player.UnityPlayerActivity; import android.os.Bundle; ...
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0answers
40 views

Partitioning a Tiled map

In my 2d platformer with libGdx, my maps are quite large (eg. 200x200). The player character is only 2 tiles high. I use Box2d for collision, so in my tiled map I have layers for terrain, ...
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1answer
103 views

How to resolse collision between moving and static AABB?

What I have is a map represented as list of Rectangles and player's rectangle. Also I have function to determine depth of the collision: Point TestAABBAABB(Rectangle a, Rectangle b) { ...
2
votes
1answer
79 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 ...
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0answers
163 views

How to make a sword swing effect

I'm working on a 2d java game on Slick engine and I always wondered how to make swing effects when striking with a sword? How to code something like this? ...
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0answers
40 views

Simulate juggling : how throw and grab objects with JBOX2D

There is an object which simulates a ball and another which simulates a hand (square).I want to be able to catch the ball and throw it with a projection force with the hand on JBOX2D. Any sample code ...
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1answer
85 views

How can I implement input handling into my game?

I'm making a libgdx game where the player dodges falling objects. To move the player I have it set so that on desktop he moves left and right when you press A and D respectively. I am trying to ...
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1answer
61 views

How to get used Resources by State/Map etc?

I'm now managing the Loading of my Resources and I got a Question in my mind. How does my Resource Manager know which Sprites,Sounds, etc. are used by the Map I want to load? First I thought of files ...
0
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2answers
320 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 ...
2
votes
1answer
196 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 ...
0
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1answer
57 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
83 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 ...
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0answers
51 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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0answers
102 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
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1answer
112 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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1answer
77 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 ...