A game library which enables cross-platform game development in Java, with support for Android development and desktop development. It makes use of OpenGL for portability.

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4
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2answers
2k views

libgdx game not disposing

My game does not exit entirely even after calling dispose() method. It loads a black screen when I launch it for the second time and works well if I kill the game manually and restart it. I get an ...
1
vote
1answer
275 views

Libgdx. Converting Screen Click Coordinates into World Coordinates for 2D Game

I'm using the InputHandler's touchdown method. It gives me my screenX and screenY. Is there a simple way to convert screenX and screenY to world coordinates? By my understanding, InputHandler returns ...
0
votes
1answer
110 views

How to keep track of previous scenes and return to them in libgdx

I have three scenes: SceneTitle, SceneMenu, SceneLoad. (The difference between the title scene and the menu scene is that the title scene is what you see when you first turn on the game, and the menu ...
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vote
1answer
366 views

Aspect ratio in LibGdx

I'm learning LibGdx and I need some help with the camera. Let's see, I'm making a Chu Chu Rocket! clon to start. I've loaded a TiledMap (10x10), and I've created an OrthographicCamera to show the ...
0
votes
1answer
113 views

LibGDX: Miscalculated polygon collision

These 2 polygons are not colliding, though this method returns true: Intersector.overlapConvexPolygons( new float[]{ 100.0f, 750.0f, ...
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0answers
77 views

Slowdown in sliding background with Libgdx

I´m new with libgx and i have a basic question. I want an background like an image that repeats indefinetely, and moves down. I did with 2 images and it worked, but the problem is that is very slow. I ...
0
votes
1answer
369 views

What is the approach of creating an image puzzle game with libgdx

I would like to create a game which consists of taking a random image, slicing it up into some number of pieces (according to a selected difficulty) and letting the player solve the puzzle. I've ...
-1
votes
2answers
112 views

How to use the zoom gesture in libgdx?

I found the example code for the GestureListener class, but I don't understand the zoom method: private float initialScale = 1; public boolean zoom (float originalDistance, float currentDistance) { ...
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vote
1answer
132 views

How to poll input for a gui in libgdx?

Ok, so my question is simple. How do you poll input with a GUI class without it affecting what's underneath the GUI? So suppose you have an RPG game with a gui for the d-pad and other controls: ...
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vote
1answer
538 views

libgdx: Rotate sprite on 3d plane

Im trying to create a game on a 3d plane but with 2d objects. I have a perspective camera and the ground plane drawn. I can't seem to get sprites onto it. I am trying to render the sprites, then to ...
4
votes
2answers
206 views

How to make a smooth circuit path in Universal tween engine?

I tried to make a circuit by starting at point A, with waypoints B and C and final target at A again, and infinite repeats. What happens is that the path from A to B, B to C is smoothed, but path C to ...
5
votes
1answer
2k views

Why doesn't my android application rotate when I rotate my screen

I am building a game in LibGDX and the game screen orientation is in landscape. I want it to stay in landscape but I still want the user to be able to flip the device onto the other side and the ...
0
votes
3answers
412 views

Exception in thread “LWJGL Application”

I'm using libGDX for my android game in which I'm trying to use bitmap fonts. I have created .fnt and .png bitmap files using Bitmap font generator of angel code.Both .fnt and .png have been placed ...
0
votes
1answer
429 views

How to clear out a drawn texture from the screen in libGDX

I am trying to clear out the drawn texture from the screen. Lets take a classic game example - in many games when the character goes through the coins the coins clears out from the screen and ...
0
votes
1answer
237 views

libGDX without android dependancies

I want to create a game that due to some assumptions doesn't make sense as a tablet game. I already created some frame (controllers, autowiring, build scripts, etc.) that would help me later on, but ...
0
votes
0answers
165 views

Box2dLights rendering in bigger scale

So basically my box2dLights are rendering in wreid places. The circle in center is my player and as you can see lamp which should be aligned to player is in the right-top corner. my code: package ...
0
votes
1answer
1k views

LibGDX cannot save to internal file

I want to save the state of the game in a file, so I can read it at the next start. The Problem is, that I get a exception, if I try to save something internal. If I try to save it local all work ...
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vote
2answers
912 views

How to get width and height from a body in box2d?

I am working on a game in Libgdx framework. I have to get width and height from a body in box2d. is their any way to get width an d height from a body in box2d??
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vote
0answers
374 views

shader program vs spritebatch [closed]

I try to draw mesh with my own shaderProgram private static String vertexShader = "attribute vec4 a_position; \n" + "attribute vec4 a_color;\n" + "attribute vec2 ...
0
votes
0answers
19 views

Artificial physics : ball angle bouncing (Vector2) [duplicate]

My question is : how can I manage to move my object (ball) on a trajectory , and onContact with another object, it bounces, respecting the angle
2
votes
3answers
2k views

How to draw a rectangle or curve between two co-ordinates in libGDX

I am new to libGDX.I just want a Rectangle or a small curve drawn between the object and the clicked position .I know libGDX has RECTANGLE class. I just want to draw a rectangle or a curved line to ...
1
vote
1answer
1k views

How to match user click and the sprite object position in libGDX framework

I am using libGDX Java framework for developing a practice game in Eclipse. My game is in landscape mode and I am using sprite image for game assets. Actually I am trying to follow the Kilobolt ...
1
vote
1answer
866 views

Movement and rotation of bodies in top down game

We are developing a 2D top down game with libgdx using the included box2d as physics engine. We don't want our bodies to accelerate but to instantly move with the wanted velocity. The bodies are ...
1
vote
1answer
123 views

White background on BitMapFont

I've tried placing a white "background" on a font that is being rendered with LibGDX, with no success. I'm using the font.draw to draw the loaded font on the screen, but every way that I tried, the ...
1
vote
1answer
104 views

how to make different sprite when moving and aiming [duplicate]

I want to create top down game where you are Russian soldier in libGDX. The player controls the soldier with W/A/S/D and aims with the mouse. That way the soldier can run sideways and shoot towards ...
1
vote
1answer
157 views

Best mobile games resolution ratio

What is the best landscape and portrait resolution ratios that will fit the most of the devices out there and the black bars size will be minimum?
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vote
1answer
169 views

libgdx get rotated sprite coords points

I would like to get the position of each edge of a sprite when he has been rotated. I have no idea how to do it, I made a image to explain it. I would like to get the X and Y position of each Red ...
0
votes
1answer
117 views

How to blend bullet sprite from white to yellow in libgdx

Does anyone have a clue that will make my bullet sprite fade from yellow to white? As the bullet is created it will be white but when it trails on it will turn yellow. Any ideas how? Is it a simple ...
0
votes
0answers
49 views

error reading atlas file [duplicate]

I follow this tutorial to learn how to develop some 2d games with libGDX: http://www.gamefromscratch.com/post/2013/10/02/LibGDX-Tutorial-3-Basic-graphics.aspx I am stuck at the TextureAtlas part. I ...
2
votes
0answers
100 views

Astar optimalization (A*) [closed]

So I have written own implementation of AStar (A*) algorithm to find paths around my 2d tile based map. My problem is that if I call it each frame (I need to do it) and I'm searching path from corner ...
0
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0answers
65 views

Libgdx get 3d intersection coordenate

Is there any algorithm that takes an arbitrary point coordinates as input and determines which is the 3d coordinate where the ray intersects the mesh? Use case: The mesh is rendered on the screen, ...
2
votes
1answer
371 views

Conceptual - What is the optimal way to combine steering behaviors with rigid body physics?

I am working on a simple 3D space simulator that makes use of the Bullet physics engine. The spaceships are rigid bodies that have a mass and hitbox so that they can be considered for collisions. At ...
2
votes
1answer
994 views

Maintaining velocity of free fall body using Box2D in libGDX

I want to maintain the speed of a free-falling Box2D body using LibGDX. I'd like the vertical velocity increase with the level. I've applied a linear impulse and velocity actually increases like this: ...
4
votes
3answers
359 views

How do I change the relative origins of a Box2D World and a TiledMap in Libgdx?

I'm playing around with Box2D and TiledMaps and I've come across this minor annoyance. As you can see, both Box2D and TiledMap render at the center of the screen. This forces me to compensate by ...
1
vote
2answers
75 views

How do I inline images between text in a Table?

I have a Table and a Label with wrapped text. I want to display some images in-line with the text. For example: This is an image -IMAGE_HERE-, and now some more text showing, yet, another image ...
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vote
0answers
391 views

How can I transform a group of objects in libGDX?

I'm new in LibGDX. I created group with actors in show method and add listener (where i calculate rotation matrix) and want to rotate all actors from group with ...
1
vote
1answer
569 views

What is the delta value passed to the Screen's render method?

The delta value given to the render method in the Screen class is a non-constant number. What is it? Where does it come from? Does it differ by screen size?
2
votes
1answer
1k views

Game Update in Libgdx

In libgdx, the game loop is the render() method. But why is that, and is there a way where I can make an update() method that is called 60 times a second? As in the update() method, I would add the ...
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vote
0answers
91 views

Rotating SpriteBatch clockwise [closed]

I have developed a 2D game that looks great on the Android. Now I want to make it cross-platform. For this I need to literally rotate everything when it is on desktop. I tried to do that by rotating ...
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vote
0answers
305 views

LibGDX - Box2D: Realistic Light and Layers

I'm having some problems with my current game. Short description: It's a 2D game where you have to avoid the lights or you lose HP. My problem is the following one: Here is the rendering process: ...
0
votes
2answers
109 views

Artillery Simulation [duplicate]

I need some help on a simulation of an Artillery like this one https://www.youtube.com/watch?v=YktWSKo_UbA. I cant figure out how to make the "tomato" to get to the selected spot. Where can I get ...
11
votes
2answers
2k views

How do some mobile games scale graphics so beautifully? [duplicate]

I'm working on my first Android game and have been struggling a bit with scaling. I've got 3 test devices 800x480, 1920x1080 and a 2560x1600 tablet. Some games look near perfect on all of them - many ...
0
votes
1answer
286 views

Top-down player collision with walls

I am having trouble trying to think of how I am going to approach collisions in my game. My idea which sucked in the beginning because it would reduce performance dramatically has failed which was ...
1
vote
0answers
215 views

How do I implement a “sliding out of / into” effect on a settings menu similar to that in Angry Birds?

I'm trying to implement a settings menu component similar to that in Angry Birds - a button control that makes an options menu slide out of it and back into it when clicked on. I use scene2d.ui to ...
0
votes
1answer
127 views

Should I use tiles in a snake game? [closed]

I'm building a simple snake game, which is my first game ever. I'm using LibGDX, which is Java-based. I've looked at the Tiled Map Editor, but I don't know if it is necessary in a simple game like ...
3
votes
2answers
210 views

Blending semi-transparent images while not stacking their alphas

In libgdx/OpenGL ES I want to render multiple semitransparent textures while keeping the alpha still semi transparent. For example If I render a 0.5 alpha circle on top of another 0.5 alpha circle, ...
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vote
0answers
240 views

LibGDX render sprites in tiled-map format ( convert texture to sprite )

I am creating a game in which till now I have used textures to create A 2D tiled game. I have created a matrix which converts the touch co-ordinates into a array index number and according to that ...
0
votes
2answers
192 views

Efficient way to check collision with potentially hundreds of objects [duplicate]

I am trying to make a top down shooter that could potentially have hundreds of objects at once at one point. I need to check collision with projectiles, walls, and enemies. I am currently using ...
0
votes
1answer
77 views

Actors (Label) not being drawn to stage [closed]

I have a weird issue that when I try to draw a Stage with only an Actor, a Label to be more precise, added to it and nothing seems to be getting drawn. This is how my setup goes: I have a Sprite ...
2
votes
3answers
1k views

libgdx - collision detection with tiled map java

currently, I am working on a 2d rpg game which is similar to final fantasy 1-4. I can load up a tiled map and the sprite can walk freely on the map. However, I will like to create a wall for it to ...