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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1answer
425 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
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1answer
182 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 ...
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0answers
130 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 ...
2
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1answer
629 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 ...
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1answer
2k 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: ...
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3answers
595 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 ...
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2answers
83 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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0answers
468 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 ...
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1answer
1k 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
4k 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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0answers
133 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 ...
1
vote
1answer
503 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: ...
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2answers
158 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 ...
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2answers
3k 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
502 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 ...
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0answers
286 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
158 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
439 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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0answers
335 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
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2answers
302 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
156 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
2k 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 ...
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1answer
418 views

Change game from portrait to landscape dynamically

I have multiple classes that implement Screen. I want to, say, have the Main Menu screen portrait, then the Play Screen landscape. Is there anyway of changing the orientation dynamically? I thought ...
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1answer
1k views

LibGdx and in-game fonts - any proven methods?

I use 3 sizes for fonts in my game: small, medium, and large. I take the base font size and attempt to scale the font based on screen size and density, but this is proving to be pretty hard. Does ...
2
votes
1answer
772 views

Libgdx Get Font Height with a Wrap

is possible to get the 'Height' of a font drawed with the drawWrapped methods (with a wrapWidth) ? getMultiLineBounds only works when \n is used, but when drawing with drawWrapped it doesn't give the ...
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2answers
12k views

How do I make a background fill the whole screen in Libgdx?

I'm using this code to set a 800x420 image to be full screen: public void show() { float w = Gdx.graphics.getWidth(); float h = Gdx.graphics.getHeight(); camera = new ...
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1answer
158 views

How to make platforms spawn without touching other platforms

So I am making a doodle jump like game where there are platforms scrolling by but right now how I have platforms spawning is completely random. I would like the platforms to be spread apart so they ...
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0answers
185 views

glsl fragment shader work diffrently on different devices

i'm making a 2d android game where i have a mechanics that allow the player to move the camera away from the main character, and to not allow him to explore the hole world, a have create a Fog shader, ...
-1
votes
1answer
88 views

Stop diagonal selection in my Match-3 game [duplicate]

I have a matching game where the user drags their finger over items to select them. The problem is, i only want the user to be able to select items by dragging vertically or horizontally, not ...
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vote
2answers
183 views

How can I fix my sprite being rotated 90 degrees more than toward the mouse?

I am trying to get a Sprite in LibGDX to look at the player's mouse. Here's the code I have (mind you, I am using JRuby): target = mouse_position.sub(spatial.position) rotation = ...
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vote
0answers
197 views

How should matrix-based Parallax Scrolling work?

The question is at the end, as it requires a bit of context. I'm not sure if my understanding, my code, or LibGDX's ParallaxCamera is wrong. LibGDX's ParallaxCamera uses Matrix4s to achieve a ...
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0answers
22 views

How do I scale and rotate around different points in Libgdx? [duplicate]

I'm using a SpriteBatcher to rotate and scale a TextureRegion in libGDX. I'd like to rotate the texture around an origin outside of the region, but have the texture scaled around the region's center. ...
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votes
3answers
717 views

Why is my texture drawn in a different place when in fullscreen?

I'm trying to draw a texture (with a crescent moon) in the middle of the y-axis: public void draw(SpriteBatch batch) { batch.draw(lune, 0, Gdx.graphics.getHeight() / 2); } It renders this when ...
0
votes
1answer
1k views

Units, Layers, and Isometric Ordering

I'm currently using LibGDX and Tiled map editor to render isometric maps. I'm having a two related difficulties. The first issue is, when do I render units that will end up changing position often ...
0
votes
3answers
2k views

LibGDX Android version

I am trying to use the LibGDX UI Project creator to create LibGDX projects, but it doesn't allow me to choose the Andorid version for the project. This is a problem for some android features. For ...
5
votes
2answers
225 views

How to make part of the Texture not to be scaled.?

I am new to LibGdx, i was doing one example for my learning and struck with this question, i had searched in google but i am not able to find the answer for this. 1) How to make part of the Texture ...
0
votes
1answer
288 views

isometric coordinates issue: (0,0) and (5,5) are flipped?

I am having an issue with the isometric coordinates. When I enter the coordinates (5,5), the character should be at the bottom corner of the tile, but it is at the top corner, (5,5) and (0,0) look ...
0
votes
0answers
25 views

libgdx : Scrolling background from spritesheet causes lag when sprite is repositioned… am I doing something wrong? [duplicate]

So, I use a sprite from a spritesheet to draw the background and repeat it. (I am drawing it twice) However, the moment that the background is re-positioned to make it look infinite, it causes a lag. ...
4
votes
1answer
3k 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 ...
0
votes
1answer
108 views

Trying to make sprite float up and down [closed]

Using LibGDX + Box2D and my understanding of the answer posted from this question: Here I apply the following impulse: // modify sprite's Box2d Body object int a = 8; // amplitude int f = 1; // ...
0
votes
1answer
77 views

One InputProcessor for two controllers

On my screen I want to display two controllers, one to turn around the character (We'll call itLook) and one to move the character (We'll call it Move). I have a line registering a ControllerListener ...
2
votes
2answers
156 views

How do I create a horizontally centered “gravity line”?

Here's my ideal scenario: A game object (in blue) can change its horizontal velocity, but it will be pulled back by gravity (dotted gray arrows) toward a central vertical line (in red). How can I ...
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vote
0answers
115 views

How can I modify my procedural shadows to also show some of the walls?

I'm rendering shadows in Libgdx with the method from this tutorial. I think it's a nice and easy method. I render all my shadows in a framebuffer, then invert it. Before invert: After Invert: ...
0
votes
1answer
197 views

How could I control an air hockey 's AI paddle?

I am making an air hockey game on Android with Box2D and libgdx. For the manual control, I just use the MouseJoint and it works perfectly. However, for the AI control, there is a problem: I've made a ...
2
votes
1answer
1k views

Libgdx - Collision position - Box2D

I'm actually developping my own game but i'm facing a little problem. I trying to figured out how to get the position of a fixture (collision) between two entities. For example this : ...
2
votes
2answers
4k views

How to update libgdx scene2d Label text dynamically?

I display a BitmapFont on the screen, update its text and the font is updated dynamically on the screen as well. I seem to fail to do the same with a scene2d Label added as actor to a Stage. The ...
0
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1answer
190 views

libgdx get the value of a key

I'm trying to do collision detection (which I have working well) but now I want to use it for a little more. I want to check special circumstances for the collision. Right now I'm checking for ...
1
vote
2answers
1k views

Box2D Libgdx removing bodies in case of simultaneous collisions

I am making a clone for the BreakOut game. I'm using Box2D and Libgdx for it. In the game, one scenario is that there could be 2-3 balls at one time. Now the problem occurs when 2 or more balls ...
0
votes
2answers
129 views

libGDX map transition via try & catch exeption

I have a simple question. Some explination first, however: I am using libGDX and making a Legend of Zelda-type top-down game and I'm having an issue with map transitions. When I made the tilemap ...
2
votes
1answer
387 views

How to have the game world get rendered on just a part of the screen?

I am implementing a game on both Desktop and Android. The Desktop version will just rely on the keyboard to handle the user input on the game screen, whilst the Android one will have to have a set ...