Questions tagged [libgdx]

LibGDX is a cross-platform Java game development framework based on OpenGL (ES) that works on Windows, Linux, Mac OS X, Android, iOS and your WebGL enabled browser.

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15
votes
3answers
5k views

How do I move the camera in full pixel intervals?

Basically I want to stop the camera from moving in subpixels, as I think this leads to sprites visibly changing their dimensions if just ever so slightly. (Is there a better term for that?) Note that ...
7
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5answers
30k views

How do I destroy a Box2D body on contact without getting an IsLocked assertion error?

I get this error when attempting to remove a body from the world: java: /var/lib/hudson/jobs/libgdx/workspace/trunk/gdx/jni/Box2D/Dynamics/b2World.cpp:134: void b2World::DestroyBody(b2Body*): ...
1
vote
2answers
522 views

How to Refresh Dependencies after Adding FreeType Extension in Android Project

I'm planning to use FreeType fonts in my game (LibGDX and Android Studio) and I already added the freetype dependencies in my project. How can I refresh the dependencies after adding them? I have ...
22
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4answers
26k views

Resolution Independence in libGDX

How do I make my libGDX game resolution/density independent? Is there a way to specify image sizes as "absolute" regardless of the underlying density? I'm making a very simple kids game; just a bunch ...
8
votes
3answers
2k views

How can I check if a player-drawn line follows a path?

I want to draw an invisible path that the user must follow. I've stored that path as points. When a player draws a line, how can I test if it follows the path I've stored? Here's an example for ...
2
votes
3answers
2k views

Box2d bodies that are really close together, are getting “stuck”

I'm using a tiled tmx map, and I created a class that adds bodies to each tile within a certain layer. This has been working great so far except for when a character or an enemy moves around on the ...
7
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3answers
20k views

How can I convert a tilemap to a Box2D world?

I want to use Box2D physics and lighting with a .tmx map. How can I "convert" a tilemap to Box2D world? My basic idea is to go through the tiles on the map and ...
7
votes
4answers
15k views

2D Platformer Collisions

I've basically asked this question before, and I know it's been asked probably a billion times, but I still can't seem to do it. All I want to know is how I should go about doing basic 4-way, ...
4
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2answers
6k views

How do you create fnt (angelcode format) files from existing bitmaps?

I often gets the same problem: Someones creates a nice bitmap font for me in form of a sheet nicely formated into a png, like this: ...and i need to create the angelcode .fnt atlas for using it (into ...
7
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1answer
7k views

Why is my sprite displayed offset from its Box2D body?

I found out about this using a debug renderer. When the game starts, everything is in order. But when a collision happens, the sprite's rotation is way larger than its body. The sprite and body match ...
4
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1answer
5k 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 ...
2
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1answer
2k views

How to create a projectile motion of a cannonball in top down view?

Objective To move the bullet with projectile motion to specific destination by touch point. In the below image is an example of a bullet which has a projectile motion. On my observation, the bullet ...
4
votes
1answer
625 views

What technique should I use in a shader to give this reflective effect?

I'm working on a top-down 2D strategy game written in Java with LibGDX (though really for the purposes of this question I'll be using GLSL). I want to give metallic materials in the game a shiny ...
4
votes
1answer
823 views

GLSL 2D Silhouette

I'm trying to render a silhouette of any entity behind foreground objects to indicate their position to the player. Here's an example of what I want to achieve, from Hyper Light Drifter: From what I'...
2
votes
1answer
2k views

LibGDX Cross Platform Networking

Backstory: I've been developing a game with LibGDX for the past two years, and I've seen it refactored more times than I remember. I jumped on the iOS iKVM port as soon as it was released. But I've ...
1
vote
1answer
1k views

Creating straight lines between two Vectors? (and slopes?) (interpolation??) libgdx java

I am trying to make a game with very basic physics (just gravity at this stage). Without using box2d How is the best way to create the solid ground. I will be wanting to make ramps soon, but at this ...
0
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2answers
1k 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 ...
4
votes
1answer
12k views

Convert Screen coords to World Coords LIBGDX

I'm working on a tile based platformer game in libgdx. I'm having trouble getting the actual touch input coordinates when the aspect ratio of device is different from the virtual fixed aspect ratio ...
1
vote
2answers
2k views

How to use moveTo Actor?

How to use moveTo? I do so: actor.addAction(Actions.moveTo(500, 500, 10)); but he does not move Thanks you UPDATE does ...
24
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4answers
7k views

How to animate abstract 2d top down water texture?

I currently implement a game with a top down view of the ocean. I use the following, a little abstract texture: The actual texture is transparent, I added the green-like color for clarity. The ...
12
votes
1answer
19k views

How to match font size with screen resolution?

So I'm working on a game using LibGDX, and I have a problem. To make my game fit most resolutions, I created a base asset for each aspect ratio, for example, a main menu background image, I made it ...
8
votes
5answers
3k views

How can I implement smooth tile-based lighting?

I have been working on a 2D tile game and I have implemented hard-edged lighting: I want it to be smoothed out a bit. I don't need shadows or anything, just simple lighting. I'd like it to look more ...
9
votes
4answers
8k views

LibGDX keep camera within bounds of TiledMap

I have a simple TiledMap which I can render fine. I have a player hopping (with Box2D) around and my camera follows the player around: ...
8
votes
5answers
2k views

How can I mark levels as "complete" in a way that prevents cheating?

My first thoughts about marking levels complete is to just write the information to a file upon level completion and load that in once the app is opened up again. But how could I keep this safe from ...
5
votes
2answers
6k views

Sprite draw-order in libgdx

From other frameworks I know methods for easy ordering sprites within a spritebatch (to determine if a sprite has to be drawn in front or behind another sprite). For example in MonoGame/XNA this is ...
3
votes
2answers
1k views

How do I limit the rotation speed of a mouse-following object?

I am trying to make a 2D top-down game where player controls a spaceship. The spaceship (a rocket) is just a sprite following the mouse cursor with a fixed speed and is always pointing toward the ...
2
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3answers
3k views

How do I change my gravity and jumping logic to put the character at a specific height at a specific point in time?

I'm making a 2D platformer on Android using libGDX. One thing I've had a problem with recently is gravity and jumping. I found a few tutorials on the internet and was able to come up with this... <...
2
votes
2answers
8k views

LibGDX Swipe Detection Left and Right

I have displayed an image at the center of the screen with libgdx. If I swipe left, the image should move to the left; and, if I swipe right, image should move to the right. Subsequent swipes to the ...
7
votes
2answers
3k views

SQLite in libGDX

Does anyone have an example of how I can use SQLite in libGDX? I have a class in my original Android code that allowed me to easily access a database but I can't seem to find anything equivalent to ...
7
votes
1answer
8k views

LibGdx Android Phone Resolution problem

I am using the LibGdx framework and have an issue. Currently, I am creating a game in a resolution of 480 x 320 and using 'GL20' to remove the restriction of that dreaded 'power of two' error. It ...
6
votes
1answer
3k views

Generating a physics body for 2D Worms-like Terrain

I wrote a processing sketch that generates hills for a scorched earth clone, like this: I'm trying to figure out how to make this a physics object in libgdx, but I'm having problems figuring out how ...
3
votes
1answer
165 views

Diagonal symmetry across a filtered array?

I wrote this code to randomly generate a square terrain that somewhat resembles an island. First, I randomly populated a square with grass tiles (1s) on a plane of water tiles (0s): Then, I looped ...
3
votes
2answers
6k views

Is it possible to use animated .gif images in lbgdx?

Is it possible to use animated .gif images in lbgdx? If not how whats the alternative? We need to include animated buttons. When I use an animated gif, the animation won't play. This question (and ...
1
vote
1answer
4k views

LibGDX Stage and Viewport management for Actors?

So I've done research about how to use Stage, Actor and Viewports etc. To optimize the game for most devices running Android. I'm pretty sure that the viewport is configured or the background image is ...
1
vote
3answers
16k views

Camera Coordinate To Screen Coordinate

I want to convert the camera coordinate to screen coordinate. I have asked this question because my camera is 48m wide and 32m high but my screen is 480x320 pixels. So whatever collision point I get ...
9
votes
6answers
2k views

Why can't I read .ttf file when running Android configuration?

When running or debugging my game on Android device, I get this error in the logcat: com.badlogic.gdx.utils.GdxRuntimeException: Error reading file: data/fonts/myFont.ttf (Internal) Which is ...
8
votes
3answers
1k views

Understanding how to create/use textures for games when limited by power of two sizes

I have some questions about the creating graphics for a game. As an example. I want to create a motorbike. (1pixel = 1centimeter) So my motorbike will have 200 width and 150 height. (200x150) But the ...
5
votes
1answer
1k views

Why is libGDX's HexagonalTiledMapRenderer adding extra space?

Why are there large spaces between the hexes when rendered by HexagonalTiledMapRenderer? The tiles ARE black bordered, but that doesn't account for all the extra space. I was also able to get them ...
5
votes
3answers
4k views

2D - Smooth lighting with shadows for a tile-based game

for the last week or so I have been completely stuck on trying to implement efficient lighting. I've been researching and experimenting and I've looked everywhere that I have been capable of finding, ...
5
votes
4answers
26k views

LibGDX simple button with image

I want to make two image buttons (play, restart) in my main menu screen but I dont know how to do it. I tried this: ...
5
votes
2answers
4k views

ShapeRenderer efficiency on games

I want to draw a rectangle box to use as a text background for a visual novel library I'm writing, I wanted some flexibility of color and transparency and the ...
4
votes
1answer
948 views

generate box2d bodies from isometric tiled map

I followed the tutorial here to generate box2d bodies from a tiled map and that worked fine.... for orthogonal tiled maps. Unfortunately isometric maps use their own coordinate system where (0, 0) is ...
4
votes
3answers
5k views

LibGDX: Easy way to draw partial sprites

I am surely overlooking something, but is there an easy to draw for example only half a sprite in LibGDX? I originally thought I could do this with setBounds() but this distorts the sprite.
4
votes
1answer
2k views

Problem Implementing Texture on Libgdx Mesh of Randomized Terrain

I'm having problems understanding how to apply a texture to a non-rectangular object. The following code creates textures such as this: from the debug renderer I think I've got the physical shape of ...
3
votes
1answer
8k views

Waiting specific time to increase sound libgdx

I want to wait a moment (.5 seconds) before I increase the sound, how can i achieve this without using Thread.sleep, because i want my game to keep runnig.
2
votes
1answer
641 views

Drawing textures off screen optimization required?

I recently started using LibGDX and I am wondering if I have to optimize my code when drawing textures/sprites off-screen, just like I used to do with XNA. My biggest concern here is specifically ...
2
votes
1answer
2k views

Collision detection in libgdx

I am currently writing a little zelda like game and have a little bit of a problem with collision detection. It works but the the character stands to far away from the object. Here is my player ...
2
votes
1answer
1k views

Match-3 algorithm to fill empty space left from removing matches

I am currently creating a match 3 game. I am at the point where I have objects dropping down in the column when only one item is removed. So if an item is removed, the above item moves into its old ...
2
votes
1answer
3k 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: ...
2
votes
1answer
4k views

Libgdx understanding screen size

I'm trying to create my own jumper type game where the player moves up through an infinite y value. The problem I am having is getting the screen size to match up with the android screen. ...