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

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Avoiding memory allocation in Android game development

For obvious reasons, allocating memory on the fly in Android game development is not recommended. For example: http://developer.android.com/training/articles/perf-tips.html: There are two basic ...
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1answer
32 views

What is the relationship between glVertexAttribPointer index and GLSL location?

I've been getting some strange results when trying to implement a normals buffer for the purpose of rendering lighting. It seems to be related to the indexes for glEnableVertexAttribArray, ...
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1answer
26 views

Screen flashing while window is open [on hold]

The screen renders everything in the right place but the entire screen flickers/flashes while it's open. Any Ideas? TileMapEditor class import com.stardust.main.gfx.Assets; import java.awt.Graphics; ...
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9 views

Creating bullets at tip of rotateable object? [duplicate]

I am and not very good at trigonometry or whatever it is i'm even using. My problem is that I simply cannot figure out how to create the bullets exactly at the point of my object. The object rotates ...
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6 views

Circular references in Nation-Town-Citizens chain [migrated]

Say I have three classes, Nation, Town, and Citizen. A nation contains towns, and a town contains citizens. public class Nation { Set<Town> towns; } public class Town { ...
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1answer
33 views

TileMap not not rendering

I have a tile map that I would like to be able to move while playing the game. In the code you will see the posX and posY variables. I used these variables so that when I complete this, I can have the ...
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1answer
44 views

Rotating an object to point towards the mouse [duplicate]

I'm using slick2d for this process and trying to rotate a minigun to face the mouse. My problem is that the minigun in my game is actually rotating but no towards the mouse at all! Also, the minigun ...
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1answer
60 views

IBO interfering with VBO data?

I have a vertex and color VBO that render a plane (2 triangles) just fine. However, when I attempt to use an IBO to render the plane, the vertices are completely off. My nice square looks all crumpled ...
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1answer
27 views

Using IBO's with color

I am trying to familiarize myself with IBO's by drawing triangles etc but I'm finding no way to get the color to apply properly. Can I not use an IBO to index the color values as well? I am having ...
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19 views

How do I create a java library that is dependent upon another library? [closed]

Hello everyone, I am creating my own java library to help me when creating games. this library is just for personal development. however, some of the commands within the libarary are ...
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22 views

Java - Slick - White Screen when loading a TileMap [closed]

I'm trying to load and display a tile map i created, sadly it keep showing up as a white screen.... What am i doing wrong? I'm not getting any errors in the console, so that's a start... The ...
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52 views

libgdx building 3D terrain

I've been spending a lot of my time working with libgdx scene 2d & have become very familiar with it. I've decided I want to move over to 3D & take a couple of weeks to learn & better ...
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36 views

Why does my texture-based object picking detect the wrong object?

I am a LibGDX beginner implementing a RISK-like game. I want to let the player select territories by clicking on them, but for some reason, the wrong territory is sometimes detected. The clicked ...
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21 views

Retreive boolean value from server in Java [closed]

In my game, the server generates a random 3 digit number which the client should guess. I have already written the server and client code. For the loop termination in both sides I use a boolean ...
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0answers
52 views

How do I port a game to low-end phones?

I'm creating a 2D game using Unity. My intention is to have separate SD and HD versions of the game for Android and iPhone. However, it makes sense for me (due to information I have about my target ...
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29 views

Why do my Box2D bodies occasionally get stuck and separate forcibly?

I'm making a space game with LibGDX and Box2D. I made a video here to illustrate the issue. Verbal description: When objects collide, they sometimes get stuck together and are then suddenly separated ...
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1answer
62 views

Box2D object wont move until tons of force is used

Im making a game for android im using LibGDX and Jbox2D it is a space flying exploration game controlled with the accelerometer. so I have set the world to no have no gravity. the objects in Box2D ...
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2answers
151 views

How do I make an 8 bit sprite sheet using GIMP or Paint.NET?

I'm looking to create a sprite sheet for an 8 bit, 2D RPG I'm making. All I need to do at the moment is render in some textures. To do this, I want to make an 8x8 sprite sheet. Now, I am really bad at ...
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15 views

Projectile Motion in lwjgl with java [duplicate]

I was trying to make a game with a bow and arrow using lwjgl but I couldent get the arch right. I have a function called projectile that is updated once a frame for each arrow. my frame cap is at 60 ...
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1answer
64 views

Smooth anmiation with LibGDX

I want to move a enemy from its current position toward the mouse position in LibGDX. x, y - enemy position saveX, saveY - position where my enemy need to go(or mouse position saved at specific ...
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35 views

LibGDX Texture width and height must be powers of two

public class Game implements ApplicationListener{ public static int WIDTH; public static int HEIGTH; private Texture texture; private SpriteBatch batch; public static ...
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38 views

JBox2D Objects moving slowly (pixel to meter conversion) (SOLVED) [closed]

This problem is solved When trying to program a game using Box2D, I ran into a problem with Box2D. I filled in pixel numbers for the lengths of the the textures and sprites to create a box around it. ...
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2answers
48 views

How do I make a pop-up window with Scene2D?

I have a main-menu screen with a logo and a bunch of buttons. When the Login-button is pressed, I pop up a dialogue asking for a username and password. This works fine, other than the "popping up". ...
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61 views

Rotating a scene around a fixed axis

I am looking for a way to move my scene so that when I translate forward/back/left right it moves directly up/down/left/right on the screen. Currently it does do that until I rotate (by anything ...
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1answer
109 views

How do I multiply two RGBA colours?

I have two RGBA integers. What procedure should I perform on them to return the multiplied colour? Do I need to split the RGBA integer into its component integers (R, G, B, A)? I'm using this for a ...
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1answer
63 views

How can I do a weighted cascade down a path in a 3D environment?

I am trying to perform a weighted cascade down a path in a 3D environment. Now, what I am trying to do is have one object(a cube) in the environment scan from its coords 1 in every direction for ...
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35 views

Need some guidance implementing event based game loop in JavaFX card game

i tried to make the title as much informative as possible. Anyhow, i'll try to be brief - I'm fairly new to java programming and programming altogether, after learning the basics and some advanced ...
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33 views

Slick 2D - how to substract two vectors?

I have two vectors:- Vector2f enemyVec = new Vector2f(enemyX, enemyY); Vector2f playerVec = new Vector2f(playerX, playerY); According to docs, I can use the "sub" method to substract two vectors ...
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1answer
32 views

Libgdx : point that scrolls on the edge of a circle

I'm not very familiar with libgdx vectors. I want to create my own joystick-controller and I want to know how can I find the coordinates of B by using Vectors. I can calculate the radius and I have ...
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35 views

How is PokeMMO made (2D) or how they did it? [duplicate]

PokeMMO is a 2D Java Game, i wonder how they made it does some know how they did it?
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81 views

How can I make a swinging rope?

Base question: How can I make a swinging rope in box2d? Context: The idea is to have a rope where the player can grab it, swing a little bit to get more "momentum" and reach the next platform. Like ...
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1answer
87 views

Entity Component System: Store pointer in Component to Entity

I was wondering if it is a bad idea to store a pointer in every Component to the Entity which owns the Component. E.g. I have a Component "NPC". Each entity which owns this Component also must have ...
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4answers
579 views

Algorithm to verify if a shape is inside another

I have a rectangular canvas and I need to verify whether a shape is totally inside that canvas or not. The shape can be lines, ellipses, arcs, rectangles and arbitrary polygons. Does anyone know a ...
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2answers
44 views

How to move an object uniformly from one point to another at a fixed angle? [duplicate]

In my 2d java game, I need to move Point objects (as projectiles) from Enemy object to Player object in a straight line. I did some research and found out that I can use atan2(x, y) method of Math ...
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0answers
38 views

Google turn based multiplayer automatch criteria

I've set up a multiplayer game using Google's turn-based API. I now want to put some qualifiers on auto-matching and am racking my brain on how to solve this issue... I'm using GetVariant() to ...
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1answer
101 views

When Libgdx says “for Desktop”, do they mean native executables?

I want to clarify whether the Java Framework "LibGDX" can be used to compile games to native executables. The description/strap-line says "Desktop/Android/HTML5/iOS Java game development framework". ...
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1answer
82 views

Box2D platformer: Why does horizontal movement stop jumping?

I'm writing my sBox2D game character's movement code, but my implementation of jumping is failing: When I press the Jump key, the character jumps OK. However, when I press jump and another key (like ...
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1answer
47 views

get View from LibGDX for Android

I am making a LibGDX app, and I need to get the view to put to an Android app. Here is the code to get the view: package jangkoo.game.shadowfiend.android; import ...
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2answers
93 views

Java 2d: How to make animation only cycle once, despite control being held down?

I've been working on a 2d game, and I think I've been over-complicating how to make an animation only cycle through once. For example, if the user presses the 'a' key, the character's 'attack' ...
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0answers
61 views

X, Y, Z rotation around camera

I'm making a 3d orthogonal-projected, game using painters' algorithm in java. I'm able to rotate the objects with incremental rotations (e.g. rotate all objects 10 degrees) using affine ...
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1answer
106 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 ...
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2answers
109 views

How do I ensure my skybox is always in the background, with OpenGL?

I created a skybox in OpenGL (through LWJGL), but the only way I found to render it behind all objects was to make it very big. This leads to ugly edges between the 6 skybox planes. Optimally, I ...
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1answer
82 views

Weird inheritance hierarchy?

In my RPG, all Food objects should be possible weapons. For instance, I want the player to be able to to try kill bunnies with a cherry or a watermelon. The problem is that the easiest way to do this ...
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2answers
76 views

How to create Whirlpool/Vortex effect?

Im trying to make a Vortex effect on a Circle Body that is a Sensor. I've been looking for this and all examples i look for are in C++ or Objective C and i dont seem to translate them well. when my ...
4
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2answers
165 views

How can I get a list of servers hosted by my players?

I'm writing a multiplayer 2D online game, where game servers are hosted by the players. I want to show players a list of the currently hosted game servers. How would I do that? I know how to let ...
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1answer
54 views

How to take a screenshot with java from directX

I'm looking for a way to take a screenshot with a Java application of any running directX game. I use the following code Robot robot = new Robot(); GraphicsConfiguration config = ...
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1answer
76 views

Save a mouse coorinates after a specific number of seconds

I have a specific method that saves my mouse x and y coordinates. I want that mouse coordinates be saved by specific time (for example after 1000ms). How I need to do that in Java? Please add a simple ...
4
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1answer
96 views

Large 2D Arrays Causing Garbage Collection

I've been working on a game in Java that, for this post's sake, looks like Terraria and has random world generation. I've been using Vectors to contain my tile/block objects, but recently due to the ...
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1answer
100 views

How to resize my 2d game to fit the screen?

I am currently making a 2D game using Java (Java 2D). I want to make my game resizable. If you play any game on an emulator (e.g. legend of Zelda in fceux emulator) in full screen mode, you'll see ...
3
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4answers
287 views

Inventory implementation in Java RPG

In my game (simple RPG with Java) there will be an abstract class Creature. Critter, Beast, Vampire... will inherit from Creature. But not ALL classes that inherit from Creature will have an ...