Java is both a popular programming language and runtime environment which allows Java programs to run unchanged on most hardware and software platforms.

learn more… | top users | synonyms

1
vote
1answer
2k views

Using NinePatch in libGDX for Loading Bar

I am trying to create images for a loading bar in libGDX. I came across the NinePatch class and I was hoping to use it for this loading bar, since stretching images with a plain Texture or Sprite ...
1
vote
1answer
4k 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.
1
vote
1answer
683 views

Relating a point after an image is panned and zoomed

For Android, let's say you have a image of a map that you draw inside your view. On this map there are many, many "hot spot" locations where you want your user to be able to select. Given that there ...
1
vote
2answers
2k views

How can I use an object pool for optimization in AndEngine?

I have read up on a tutorial that allows you to reuse sprites that are re-added to the scene such as bullets from a gun or any other objects using an ObjectPool. In my game i have a variation of ...
1
vote
1answer
2k views

Andengine Traffic game: moving sprites along path on map

I'm developing simple traffic educational game like https://market.android.com/details?id=cz.allianz.krizovatky.android . When the player taps on car sprite, it started to move with other cars. If ...
1
vote
2answers
154 views

Observing particular Port for measuring network game performance

How can I check/inspect the performance of some network application via observing the port it used, I want to test the performance of my network game. If my game is using port 1009, how can I check ...
1
vote
2answers
495 views

Problems with Creating Snake's Clone on Java

I'm creating Snake's clone. My app have too classes: Snake.java and Board.java. Right now I have three problems: 1) There are two constants - BOARDS_WIDTH, BOARDS_HEIGHT. They are meant to be ...
1
vote
2answers
689 views

[JOGL] My program is too slow, how can I profile with Eclipse?

My simple opengl program is really toooo slow and not fluid. I'm rendering 30 sphere with simple illumination and simple materials. The only complex computing stuff I do is a collision detection ...
1
vote
1answer
152 views

If I convert my LibGDX game to an exe, is it legal?

I have a LibGDX jar file, and I want to have it as an EXE. Would that be legal? (Using launch4j) Also, how do I obfuscate a LibGDX game?
1
vote
1answer
151 views

How should I implement the “Observer” pattern with respect to a game world?

I'm thinking of ways to implement the Observer pattern in a game I'm developing at the moment. I can have a Game World (local map) with Game Objects (player, NPCs, monsters etc...) inside of it. Other ...
1
vote
1answer
94 views

Restarting a libGDX game to apply changes to resolution

How can I restart a LibGDX game to apply certain changes to the game such as changes to the resolution (going from 1920X1080 to 1280X720), or changing full screen. Granted the resize(int width, int ...
1
vote
1answer
117 views

Dialog Title Does Not Fit

I successfully added my own font to the default .json file and it displays, however I get some weird sizing issues. Specifically when I try to create a Dialog. This is what it looks like: Ignore the ...
1
vote
1answer
83 views

Why isn't my background drawing to the screen?

Ok, So I have a game I have been working on for a few months now and I am now stumped beyond belief. My friend who has spent days working on this background gave it to me and I put it in my game. On ...
1
vote
1answer
71 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
1answer
365 views

LibGDX: Smooth movement on a grid based game

I'm making a game with LibGDX where the player is on a grid (like a Chess board). For now, I'm moving the player by teleporting him 16px in a direction. I'd like to use the delta time to make smooth ...
1
vote
1answer
135 views

Bullets won't shoot out of barrel in top-down shooter

So I am working on a top down shoot and have been stumped on why my bullets refuse to come out of the barrel of the gun. I know about the rotation equation which is x2 = x * cos(theta) - y * ...
1
vote
1answer
108 views

[ C# ]xna to monogame

I'm thinking of going back to xna and c# because I have used java 2d, slick 2d and some other libraries. I started off with xna and c# but ignored it for java. I'm thinking of going back, but I see ...
1
vote
1answer
122 views

Libgdx stage rendering issues

I'm using scene2d for the first time, and I can't get anything to draw EXCEPT the stage ui. Say I have my ui on top of my game screen: uiStage.act(): batch.begin(); gameSprite.draw(batch); //does not ...
1
vote
1answer
108 views

2D Collision in JavaFX - Bad accuracy with .intersects()

I have several Shape objects - Circle, Rectangle and Polygon. I use the built-in .intersects(Bounds1, Bounds2) method to detect collision but it's quite inaccurate. Circle c1 = new Circle(20); ...
1
vote
1answer
71 views

Slick2D: Initializing graphics object before game loop

I'm using the Slick2D Java game library and I want to set the scale of the graphics object that gets passed to the render method in my game loop. I'd like to do this outside the render method, so ...
1
vote
1answer
383 views

Using Unity 3D in LibGDX

Is it possible to use Unity 3D engine with LibGDX when making Android game apps? Is it also possibly used for making 2D games using Unity 3D and LibGDX? I would like to know if it's possibly ...
1
vote
1answer
358 views

How can I drag a polygon based on a mouse-moved event?

I have drawn a polygon in Java using java.awt.Polygon. I want to move that polygon with the mouse (by dragging it). I know that I have to use mouseDragged method in addMouseMotionListener. That way I ...
1
vote
2answers
370 views

How can I move an object towards another along a straight line

How can I move an object (like a cube) towards another object? Let's say that we have a red cube in the center of a floor, and a blue cube in another location, there aren't objects between this two, ...
1
vote
1answer
318 views

How should I generate the board for a match-3-style game?

I am trying to create a "match 3" game. I'm stuck figuring out a good algorithm to fill up the game board. My game's board is 8x8. EDIT: A few things: The board should always be solvable. for ...
1
vote
1answer
371 views

Movement of body after applying weld joint

I have two rectangular bodies. I've applied Weldjoint successfully on these bodies. I want to move that joined body by applying linear impulse. After weld joint, these two bodies becomes single body ...
1
vote
1answer
192 views

How to only render part of an image in lwjgl/openGL

I'm making a mining/building game in java using slick2D and I want to make it so you can only see a few blocks in any direction while you are underground. The best example I could find of what I want ...
1
vote
1answer
315 views

What's the most memory efficient way to load a tiled map?

Currently I am working on a simple 2D platformer and I want to load a tiled map. What I've started working on is loading the tiles using a text file. My first question is simple: is a text file the ...
1
vote
1answer
159 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
1answer
245 views

Is this a good way to handle different game screens?

While developing my game I am often asking myself if my way of handling different game screens (MainMenu, Game, Ending, Highscore) is a good one. I am currently using only one activity. The game loop ...
1
vote
2answers
183 views

Store voxel type data in XML or Java classes?

So, I want it to be very easy to create all the entities of my game and for other people to come in and do the same. I was thinking I could just let the users/myself create an XML sheet the stores all ...
1
vote
2answers
133 views

Twitchy sprite movement

I'm having an issue with sprite movement, and I'm not sure how to deal with it. When I set a destination for my player sprite (by clicking the screen), it sets the player moving in that direction. ...
1
vote
2answers
199 views

Map logical coordinates to graphical for walking

I'm having a problem with mapping logical coordinates to graphical ones when my character is walking. I've been able to map them without the graphical walking in between, i.e it just "jumps" from one ...
1
vote
1answer
886 views

libgdx: how to manage entity classes [closed]

Good day sirs, I know this is a newbie question but I really need to ask it. I've been reading a lot of sample codes on libgdx, and I have seen entities(player, enemy, boss,etc.). my question is what ...
1
vote
2answers
496 views

How would I detect if two 2D arrays of any shape collided?

Say there's two or more moveable objects of any shape in 2D plane, each object has its own 2D boolean array to act as a bounds box which can range from 10 to 100 pixels, the program then reads each ...
1
vote
1answer
226 views

2D game level progression

I'm creating a 2D game similar to Mario. What is a best practice to allow the character to move through the level given a limited screen size? The way I have it now is the Player moves across the ...
1
vote
1answer
229 views

Collision detection with entities/AI

I'm making my first game in Java, a top down 2D RPG. I've handled basic collision detection, rendering and have added an NPC, but I'm stuck on how to handle interaction between the player and the NPC. ...
1
vote
4answers
257 views

Changing color of a moving image without lowering the fps

I just added an option to my game that makes it so that all the enemies will have a random color for their clothes instead of the regular blue. I use this code to draw rectangles over the shirt of the ...
1
vote
1answer
842 views

JMonkey - Create health bar?

How can I create a health bar in JMonkey? Is there some documentation that can help? I am working on a game, specifically “Battleship”, using the JMonkey Engine (JME3). I want to add health bars on ...
1
vote
1answer
317 views

Detecting collision with a 3D array of boxes

I am at the stage of my development process where I want to implement collision. Now I can think of a simple way of doing it, if the camera's x, y or z are inside the position of a certain cube then ...
1
vote
3answers
394 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, ...
1
vote
2answers
151 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 ...
1
vote
1answer
2k 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.
1
vote
1answer
252 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 ...
1
vote
2answers
1k views

Render rotated rectangle inside other rectangle bounds using Libgdx

I have this code to generate a red rectangle inside a grey rectangle: new Rectangle(grey_rectangle_position_x, Game.SCREEN_HEIGHT/2-Rectangle.height/2,0); This code makes the following: Now, I ...
1
vote
1answer
207 views

When to Load Assets

I'm writing a game using LWJGL and Java, and I was just wondering if there is a rule/recommended method for when to load resources. I have seen examples that load all of the resources at the ...
1
vote
1answer
1k views

Can I mix OpenGL and swing?

I'm working on a small game library for me and some people I know that just handles the window and nothing special that we weren't gonna use. I know how to use OpenGL and stuff I just don't like ...
1
vote
2answers
2k views

Applying Forces to Box2D Bodies

In full disclosure, I am VERY new to box2D let alone the Java version of it. I have a box (here of type Hero) that I am trying to move. I did this by trying to apply a force as follows... private ...
1
vote
2answers
390 views

Quaternion Camera

Can someone help me figure out how to use a Quaternion with the PerspectiveCamera in libGDX or in general? I am trying to rotate my camera around a sphere that is being drawn at (0,0,0). I am not sure ...
1
vote
1answer
1k views

setPosition of Sprite onUpdate in AndEngine

I am trying to get a "highlighter" circle to follow around a sprite, but I am having trouble, I thought I could use the onUpdate method that's available to me in SequenceEntityModifier but it's not ...
1
vote
2answers
1k views

Drawing Lines on android with matrix

Can a matrix be used when drawing lines and paths on android? the DrawBitmap mathod takes a matrix as argument, I cannot find anything similar when drawing lines.