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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How to I rotate a triangle by dragging the mouse in libGDX?

More specifically, I have rotation working in a way I don't like as follows: //Draw the triangle using this draw method //batch.draw(texture, x, y, ...
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1answer
683 views

Get back or delete an existing OpenGL object, then change it and draw at new. How?

With OpenGL i'm drawing for example a circle. Can i take this drawn circle back out of the window and change something and then draw it back on the window? Or can i /have to delete it and then draw ...
2
votes
1answer
208 views

Camera not strafing (GLSL)

I use this code in my GLSL vertex shader, where v_position is the vertex position: gl_Position = v_position * u_camera; and set u_camera as follows: meshShader.setUniformMatrix("u_camera", ...
3
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0answers
1k views

How to make the background of an OpenGL object transparent? [closed]

It sounds so simple but i didn't get it to work. The Background of my FrameLayout where i add the GLSurfaceView in is colored blue but there is only black. So here is my method to initiate the ...
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1answer
105 views

Can't call method out of a timer. Why? [closed]

I have another problem i can't solve by myselve. My situation: I have four FrameLayouts in LinearLayouts. I color them, set Layout hight and width at wrap content and just change the minwidth to ...
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1answer
156 views

Collision and gravity problems

So this is an easy question. I need to implement gravity in my game but where I'm stuck is what variables do I need in my Entity object for the calculations and a good algorithm that I can use for ...
1
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2answers
404 views

Inputting Only Alphabetical Input - Slick2D

I'm trying to obtain the user input for when they enter their own name. However I would prefer to have it Alphabetically. This is what I'm doing at the moment: if (input.isKeyDown(Input.KEY_A)) ...
1
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1answer
352 views

Cost of changing scene in andengine

I'm working on a simple 2d puzzle with small textures (in count and quantity). Now after I finished the game logic I'm considering tow options to switch between levels: Remove all objects manually ...
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2answers
1k views

Android bitmap placing

I've recently added an explosion in my game, for when enemies get killed, and it works fine and all, but the explosion wont "spawn" on the enemies x and y. The problem is that I'm not drawing the ...
7
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2answers
759 views

What's the best way to draw lots of trees

I'm writing an app which renders a random island planted with trees. The trees are currently two quads, criss-crossed and drawn with textures. I plan to have more complex meshes that form different ...
0
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1answer
297 views

How do I pass textures into a fragment shader in Slick?

I've written a shader that uses three different textures, tex0, tex1, and tex2. I can load it into Slick and successfully display it, but I can't figure out how to set the three different textures. ...
4
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1answer
5k views

The most efficient and accurate game loop?

Obviously for a game to work you need a game loop... Normally, my game loop would consist of something like this: while(running){ update(); render(); Thread.sleep(10); } This seemed to ...
0
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1answer
1k views

Dependency setup between libGDX projects in Eclipse IDE

For my game I'd like to create another project that extends the functionality of libGDX and since it will be an independent project it could be easily reusable. How can I achieve this in Eclipse IDE? ...
1
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4answers
181 views

Checking game objective status in efficient way on each update call

I am creating a 2d mobile game where there are three levels. Each level has 20 objectives. This can increase in the future. Examples: Level 1 Current Objective: 2/20 Objective : Collect 1000 coins ...
1
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2answers
699 views

Removing the titlebar while using slick2d?

I recently started using slick2D in my gaming programs and a problem I have is not having the ability to remove the border/titlebar. I usually do this to create my own cutom look/ interface but if I ...
5
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1answer
2k views

How To Correctly Extend the Sprite Class in LibGDX

I am currently pursuing game development as a hobby, and have run into what seems to be a conflict in my mind regarding how to properly (using best practices) extend the Sprite class in LibGDX (or for ...
2
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2answers
479 views

Smoother controls

I am trying to move my background left if the user hits the right key. and right if the user hits the left key, so that it will look like the player is moving. The problem is that whenever I hold the ...
4
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2answers
430 views

Inventory Grid Detection

I'm working on creating an inventory system for a game. The inventory system will use cells and 2D images to represent items, like Minecraft, Diablo, or WoW. I've hit a bit of a snag when trying to ...
0
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1answer
1k views

How do I programmatically remove an image's background color?

I have a sprite sheet (image) and want to draw it on screen. image = sprite sheet image x = player x position y = player y position width = player width height = player height public ...
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2answers
1k views

Moving a sprite diagonal?

I wonder how I should increase and decrease the value of xPos and yPos to be able to move a sprite object diagonal and in different angles? canvas.drawBitmap(image, xPos - (image.getWidth() / 2), ...
0
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2answers
377 views

LWJGL Game crashes on some other machines [closed]

I just tried running my game on a friend's laptop, but for some reason it crashes. The exported .jar runs fine on my machine, and some others too. I can see that is has something to do with the ...
0
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1answer
181 views

Android activities, when to use them?

I'm getting back into programming my game and I can see that I've used activities for so many things. I only have one with a custom-view (my actual game), the others are activities with XML-views, ...
4
votes
1answer
1k views

2D Software Lighting Issues in Java

I'm creating a 2D top-down tiled game in pure Java and by now I'm trying to implement a way to do lighting. First, some details on how I render: there is a screen class which handles all the ...
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3answers
536 views

First Person Shooter vertical mouse aim

I've just started writing a 3D First Person Shooter in Java, and I'm having a bit of trouble with tracking the mouse movements and moving the camera accordingly. I'm implementing typical FPS movement, ...
8
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2answers
953 views

Random Zelda-style map generation

Im trying to randomly generate a map of rooms connected by doors, and I've succeeded in generating one using this code: public void generate(GameContainer gc) { rooms = new ...
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1answer
163 views

Will this Entity Code work? [closed]

How do you create 2D entities? Here is something i tried to write up as a base for entities but is this usable and is entites like this?: public abstract class Entity { int attackRange; // ...
4
votes
5answers
5k views

Collisions reflecting ball velocities incorrectly

Ok so this is for a small uni project. My lecturer provided me with a framework for a simple brickbreaker game. I am currently trying to overcome to problem of detecting a collision between the two ...
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1answer
78 views

Required Throwable found SlickException when initializing states

When I write this statment throws a SlickException. I got an error and this is the message: required Throwable found SlickException. This my code : public void initStatesList(GameContainer gc) ...
0
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1answer
1k views

Creating a BufferedImage with several smaller images?

I am making a 2D tile based game. The tiles render fine from a spritesheet and a text file. However, I am using a for loop to draw the map to the screen. When it refreshes, it slows down the loop, and ...
3
votes
1answer
290 views

LWJGL Eclipse Resource Deployment

I'm still experimenting with some OpenGL in LWJGL, and as I get to know more and more about OpenGL, I start to do more complicated things like multi texturing, shadowmapping and more. Now, right now ...
1
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2answers
160 views

Moving Sprite With Physics Frame

Normally, a physics frame in pink (see image below) gives the body for detecting hit signal. It usually either falls down or lifts up depending on the gravity orientation. The question is: Is it ...
5
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2answers
1k views

Is it legal to pack LibGdx libraries in my jar file? And to obfuscate them?

I'm using LibGDX and deploying a runnable jar file, using the Eclipse feature, with libraries extracted into it. There are also .so files and .dlls inside. Is it legal to do so? I didn't find ...
1
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1answer
2k views

How to render a tilemap efficiently? [duplicate]

I'm using this code to load a tiled map, composed of 1000x1000 32x32px tiles: map = new TmxMapLoader().load("levels/xyz.tmx"); camera = new OrthographicCamera(); camera.setToOrtho(false, ...
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1answer
1k views

Tile Maps in Java JFrame Game

I am making a 2D Java game with Java's own drawing library. I was wondering how I would make a tile map display on the screen. I would prefer to use a GUI application to make the maps. I'm looking for ...
1
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1answer
1k views

Is there a way to make a game using lwjgl work on android?

I'm working on a platformer and I'd like to make an android version. Do I need to rewrite everything for android, or can I use something to make the lwjgl code work with android?
0
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1answer
151 views

Merging InputProcessor and GestureDetector

I'm planning to make a simple soccerball app. When I attempt to drag the ball, I use the touchDragged() from InputProcessor to move the ball left or right. Next, while holding before releasing, I use ...
0
votes
1answer
194 views

Simulating building stress [closed]

I need to simulate the effects of adding supporting materials to a building structure for a genetic algorithm in a block-based world. Essentially I am planning to use a genetic algorithm to optimise ...
2
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1answer
3k views

How to implement bullet physics in libgdx

I am new at game development want to know that how can I implement bullet physics in libgdx. I searched lot of things on Internet but nothing found worthy.
2
votes
3answers
2k views

What are the benefits of using a 2D game engine on Android?

I have thought about just coding a 2D game on Android using just pure Java and the Android SDK, no engines like libdgx, cocoa-2dx attached. I don't know if I really need to use a game engine or not. ...
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votes
2answers
379 views

Tile Based Collision Checking In Java?

I have my map stored in 2 arrays: Tiles : Tile names TileTypes : SOLID or BASIC I want to be able to walk through BASIC Tiles (Like ground tiles). But not the SOLID Tiles (Like wall tiles). I ...
0
votes
1answer
131 views

JFrame launcher stays open when I'm finished with it

I have written a launcher that prompts the user for their name then starts the game when they hit enter. The launcher looks like this: But when the user hits enter, this happens: The launcher stays ...
3
votes
1answer
578 views

Cut a translucent square in a texture

How to remove (cut-out) a transparent rectangle in a Texture, so that the hole will be translucent. On Android I would use the Xfermodes approach: ...
1
vote
1answer
322 views

Pick and Drop the Ball Testing Without Replicating the Physics Frame

I am making a program that pick, drag, and drop the ball. In real life, once you pick the ball and drop it, whenever the available object is (what you see is what you get) will only be picked and ...
5
votes
1answer
882 views

Structuring server-side networking with entity-component systems

I've been working on an online game, and recently have been working on converting the base of the game to use the Artemis Entity System Framework. I'm having a bit of difficulty conceptualizing ...
7
votes
1answer
3k views

How to force a line break before the last word of a line reach the edge?

I'm printing a sliding text by adding each letter after a short period of time. My problem is that when the text multilines, the last word of a line starts on the current line and jumps to the next ...
-3
votes
1answer
229 views

java app goes too slow in android os [closed]

The problem is that my java app contains too many animated sprites and it runs very slowly on android system. Does the usage of .gif animation instead of sprite animation will improve the speed? I ...
3
votes
1answer
249 views

Where should I put my mob rendering code?

I'm making a simple LWJGL game. However, I'm a bit confused about rendering. So I have a Mob class and a TriangleMob is a basic enemy. package daniel.entity.Mob; public class TriangleMob { ...
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votes
1answer
110 views

3d objects in binary files

Currently I have 11 3d spheres created at runtime in my application. The application runs well as it is, but I'm anticipating some garbage collection hiccups due to camera panning. Would performance ...
0
votes
1answer
319 views

problem adding bumpmap to textured gluSphere in JOGL

I currently have one texture on a gluSphere that represents the Earth being displayed perfectly, but having trouble figuring out how to implement a bumpmap as well. The bumpmap resides in ...
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votes
2answers
1k views

How can I draw a map that is stored in arrays [closed]

I have spent over 12 hours with no avail trying to successfully draw my map. The map is stored in an array called Tiles[]. Each value in Tiles can either be 4 numbers: Grass Stone Water Void (EMPTY ...