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.

learn more… | top users | synonyms

3
votes
4answers
1k views

How do I apply different probability factors in an algorithm for a cricket simulation game?

I am trying to write the algorithm for a cricket simulation game which generates runs on each ball between 0 to 6. The run rate or runs generated changes when these factors come into play like skill ...
3
votes
3answers
1k 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, ...
2
votes
5answers
3k views

How to Make Objects Fall Faster in a Physics Simulation

I used the collision physics (i.e. Box2d, Physics Body Editor) and implemented onto the java code. I'm trying to make the fall speed higher according to the examples: It falls slower if light object ...
2
votes
1answer
826 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
4answers
424 views

Is it a good idea to make most actions in a game driven by simple tiny threads (in Java)? [duplicate]

I'm thinking of for example making the jump action of a character, that takes ~1s, a distinct runnable, so then other threads can read its state, with additional control over the action itself by the "...
2
votes
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: ...
2
votes
1answer
712 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. viewport =...
2
votes
1answer
783 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
710 views

Camera scrolling and game boundaries

I am making a platformer game in JBox2D and LWJGL that has a scrolling camera, but I have hit a wall with the boundaries of the camera. Essentially what I have right now is a Box2D world that is ...
1
vote
1answer
118 views

Different screen sizes?

I have looked through all of the android docs and many stack overflow questions, and I have a question on supporting multiple screen sizes. If I have some drawables, I know I need to put them in ...
1
vote
2answers
1k views

2d very large tile based game, zoom and pan considerations

what's a sensible way of implementing zoom and panning for my game? each tile is very large, 100,000 x 100,000 pixels, with some objects possibly being only a single pixel at maximum zoom (small ...
1
vote
3answers
1k views

Game Programming in java [closed]

I'm new to this site as well as new in game development, so I need to get a great start for it. Can anybody tell me from where I should start and some books or link are appreciable. What are the ...
1
vote
2answers
129 views

Swap buttons in layout

Say I have 4 buttons. I want to have button 2 always swap out with another button, randomly. So, when the user taps button 2, it should swap with another button (randomly). Now, button 2 is at the ...
1
vote
1answer
180 views

Server networking - Thread per player

As my game is purely multiplayer, online performance is important. Should I run two threads for each player/connection? (One for input and one for output) or should I run one thread for all player ...
0
votes
0answers
245 views

Sprites not being rendered on screen change - Android Libgdx

In my game over screen for my Libgdx Android game I've the following code which starts a new game upon a screen touch. if(Gdx.input.isTouched()) { ScreenManager.setScreen(new ...
0
votes
1answer
482 views

JBullet - Detecting when 2 objects collide?

How can I detect when 2 collision objects collide with JBullet? Currently, all body types are going to be of type RigidBody. I have quite literally been trying to find the answer of this for over 2 ...
-1
votes
1answer
553 views

What is the best way to make UI for an Isometric game in java [closed]

What do you think is the best way to make UI for an isometric game.. I dont have much experience in UI so im not sure where to start. I need something the mouse can interact with and that works good ...
7
votes
2answers
3k views

Java single Array best choice for accessing pixels for manipulation?

I am just watching this tutorial https://www.youtube.com/watch?v=HwUnMy_pR6A and the guy (who seems to be pretty competent) is using a single array to store and access the pixels of his to-be-rendered ...
6
votes
5answers
1k views

What is Java missing that might make it difficult to develop fully-featured 2D games?

Without using any external libraries, does Java, including all officially supported APIs give you enough to develop fully-featured 2D games? The reason I ask is that I hear a lot of "bad-mouthing" ...
5
votes
4answers
5k views

How to find the entity I'm looking at?

I am currently making a mod for Minecraft but I have come to a stop because I am lacking in some knowledge. I need to get data for the entity I am looking at, which I believe requires the use vectors, ...
4
votes
1answer
5k views

When to use ShapeRenderer & SpriteBatch in libGdx?

As a beginner(in GdxLib+Android), i found that for rendering particular screen, we can render that using both ways then when to use specific ones? & What is the best option for Updating the ...
4
votes
1answer
1k views

Scaling a game view with letterboxes?

I'm creating an Android game and I want everyone who plays it -- no matter the size or shape of their screen -- to see the same 480x800 playfield but, depending on the actual resolution of their ...
4
votes
3answers
2k views

Tetris - Rotations using Linear Algebra (Rotation Matrices)

I'm making Tetris in Java and am at the point of rotations... Originally I was hardcoding each rotation: if (direction.equals("right")) { if (shape.equals("Bar")) { if (...
3
votes
2answers
134 views

Algorithm for triangle picking?

So i found out that i need a triangle picking algorithm, i need to see if my mouse is over the triangle. I've heard what color picking is, but it would pretty much just drop the performance twice (...
3
votes
4answers
722 views

Designing a scriptable questing system

I'm currently working on a scriptable questing system. As for scripting, I will probably use JavaScript, but I'd appreciate some help with the design of the system. My first attempt essentially ...
3
votes
2answers
844 views

Stop map from scrolling but let player still move?

I have a basic method of scrolling around on a map (moving the map instead of the player), but at when the player gets to a certain proximity to the edge, how do you stop the map from scrolling, but ...
3
votes
1answer
402 views

In Slick2D, how can I generate a 2D platformer map from an image?

I'm fairly new to game development. I've been messing around with Slick2D. My map consists of rectangular objects. I want to use an image to represent my map, similar to this: How could I generate ...
2
votes
2answers
647 views

OpenGL Camera causes spatial distortion

I'm trying to implement a 3D camera of the "Orbit around the origin" variety in a game engine I'm developing in order to learn about 3D graphics and game programming. I have a basic handle on the ...
2
votes
1answer
222 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
2answers
990 views

Tile based map and collision; getting stuck

I'm trying to make my character move around a tile map with collisions. Everything works fine except for one thing. I show you a picture with the problem: http://i.stack.imgur.com/ZWI7x.jpg That is, ...
2
votes
2answers
1k views

How should I do 3D games through Java on a mac? [closed]

I have been self-teaching myself Java on the mac mostly because the language is cross-platform. Recently, I have been only able to develop 2D games using the Graphics2D class. Now, I want to learn ...
2
votes
1answer
546 views

Preventing diagonal movement

I was originally fine with diagonal movement but it's clashing with my sprite animation... public void keyPressed(KeyEvent e){ int key = e.getKeyCode(); switch(key){ case ...
2
votes
2answers
283 views

RTS combat system

I am developing a small-scale TB/RT Strategy hybrid, not unlike the Total War series. It's in the classic medieval setting, with only melee infantry combat currently implemented for testing. Units are ...
2
votes
1answer
101 views

In JBox2d when dragging a Body, why is the direction is flipped vertically?

Why is it when I drag a JBox2d Body with the mouse, the vertical component is flipped? e.g. If I drag down-right, the Body moves up-right. Is this expected behaviour, a bug in JBox2D, a Mac ...
2
votes
3answers
451 views

Efficient way of detecting a touched object in a game?

Imagine a Sims-like 2D game for a touch based mobile phone where one can interact with virtually any object in the scene. How can I efficiently detect which object is being touched by the player? In ...
2
votes
4answers
713 views

Android Game-Loop (rendering & logic removed, but still 'skipping frames')

Overview Guys really hoping for some help here. My game loop is based on code from Fix Your Timestep!. I've read the article more than a few times, but I can't quite work out what exactly is ...
2
votes
1answer
153 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 ...
2
votes
1answer
247 views

Is using the applet class in a Java game a wise thing to do?

I am making an 2D multiplayer game in Java project, by using Java sockets and simple java.applet.* Our teacher told us to use J2EE concepts in the project. Do I have to use JSP? Is it better or ...
2
votes
1answer
446 views

Java getResourceAsStream as local resource

Before using LWJGL, I used the Graphic method, and there I displayed imageicons, and I had the picture file located in the resources. I used: ImageIcon tcard = new ImageIcon(this.getClass()....
1
vote
1answer
2k views

Android frame by frame PNG animation

I am new at Android game development. I have done some apps before, but none of them are games :) So, I wanted to do a frame-by-frame animation of PNGs. I tried with AnimationDrawable, but ...
1
vote
0answers
235 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 ...
1
vote
1answer
221 views

Why is there a huge update-delay in my client/server code?

I'm working on my Java game with Libgdx and having trouble with the network code. I can create a server, make multiple clients connect to it, but there is a huge delay between the player's input and ...
1
vote
1answer
288 views

Calculate when round object is inside an ellipse

I want to calculate in java when a circle is inside an ellipse. I drew an example below: For this particular problem, the top left corner of the field has the position 0.0f, 0.0f. The bottom right ...
1
vote
2answers
704 views

What are some good resources on creating and reading 2D game levels in Java?

Could some resources be listed in relation to the creation and management of simplistic, efficient 2D game levels, that are available for use with Java?
1
vote
1answer
93 views

Greedy Mesh generation for a voxel-based game

EDIT: I have already found my problem and fixed it (but I cant accept my own answer for another 2 days) I'm currently making a 3D voxel-based game and now that I have started optimising some aspects ...
1
vote
1answer
171 views

Electronic circuit simulator four-way flood-filling issues

I've made an electronic circuit board simulator which has simply 3 types of tiles: wires, power sources, and inverters. Wires connect to anything they touch, other than the sides of inverters; ...
1
vote
2answers
115 views

How can I detect a perfect passageway for collision detection?

The problem is when I move diagonal it moves fractions of units and therefore my coordinates might be a fraction of a unit say (40,400) might be actually (40.12,400.40) but another problem is my pink ...
1
vote
1answer
897 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 ...
1
vote
3answers
1k views

How to make an Actor follow my finger

I'm back with another question that may be really simple. I've a texture drawn on my spritebatch and I'm making it move up or down (y-axis only) with Libgdx's Input Handler: touchDown and touchUp. @...
1
vote
1answer
146 views

How should I go about protecting my script files?

I am working on a small multiplayer game with a whole bunch of scripting components. I know I can't store my files in plaintext otherwise anyone would be able to change the functionality of core ...