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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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 ...
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1answer
130 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 * ...
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1answer
98 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 ...
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1answer
100 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); ...
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1answer
64 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 ...
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1answer
360 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 ...
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1answer
296 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 ...
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2answers
315 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, ...
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1answer
297 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 ...
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1answer
206 views

Is it possible to achieve a smooth sprite animation with a fixed 60 FPS using Java 2D?

I've seen a lot of different game loops, and before implementing anything complicated I decided to start with a capped 60 FPS. My run method looks like this in my game thread: /** * Fixed Frames Per ...
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1answer
335 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 ...
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1answer
184 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 ...
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1answer
304 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 ...
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1answer
157 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 ...
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1answer
227 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 ...
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1answer
853 views

Rotate image around a specified origin

I'm trying to rotate my Turret.png (small Gunhead with a laser in front) towards the mouses location on the screen. I tried just using my method for rotating projectiles towards the next step on their ...
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2answers
178 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 ...
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2answers
132 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. ...
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2answers
197 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 ...
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1answer
798 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 ...
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2answers
473 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 ...
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1answer
212 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 ...
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1answer
220 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. ...
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4answers
234 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 ...
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1answer
810 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 ...
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1answer
298 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 ...
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1answer
583 views

LibGDX Cross Platform Networking

Backstory: I've been developing a game with LibGDX for the past two years, and I've seen it refactored more times than I remember. I jumped on the iOS iKVM port as soon as it was released. But I've ...
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3answers
388 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, ...
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2answers
150 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 ...
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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.
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1answer
246 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 ...
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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 ...
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1answer
206 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 ...
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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 ...
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2answers
1k 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 ...
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2answers
379 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 ...
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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 ...
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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.
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2answers
2k views

How to add text box in slick2d?

I wanted to let the player rename the character of my game. So I thought that making a text box and when he clicks the ok button, the text inside the text box will make it to a string and render it on ...
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1answer
128 views

Help with Collision Resolution?

I'm trying to learn about physics by trying to make a simplified GTA 2 clone. My only problem is collision resolution. Everything else works great. I have a rigid body class and from there cars and ...
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1answer
515 views

Random Movement for multiple entities

I have this code for a arraylist of entities. All the entities use the same random and so all of them move in the same direction. How can I change it so it generates a new random number for each ...
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1answer
898 views

Java 2D Tile Collision

I have been working on a way to do collision detection forever, and just can't figure it out. Here's my simple 2D array: for (int x = 0; x < 16; x++) { for (int y = 0; y < 16; y++) { ...
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2answers
303 views

How do I make a Java gave without a JFrame?

I am working on an arcade-like game, and so far, I have been using JFrame. All the action occurs in the JFrame basically. However, I've noticed that a lot of games that you install on a computer ...
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1answer
455 views

Edge flicker when moving Camera (2D)

I have a Orthographic camera. I have a fixed landscape texture and a texture for a moveable object. If the object moves to the right the camera will also move with the object. When I also draw an ...
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1answer
83 views

Variable Visibility Class Interaction

I have a very general question about how game classes interact with eachother in a growing RPG game project I'm working on. (Writing it in java/Slick2D, not that is matters because the question is ...
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1answer
194 views

Game Engine Collision Handler

I'm making a collision handler for a Java game engine. I made an interface called Collidable. I have a method called onCollision which takes the parameter of my Engine Game Object. public void ...
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1answer
555 views

First Minecraft mod not working: make a new sword

I am making my first mod and cannot see what is wrong with it. I am using MCP and Modloader. For my first mod I was going to make swords. I started with making a new EnumToolMaterials WOOD(0, 59, ...
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2answers
348 views

How do we adapt our game to work over a network?

A friend of mine has made a Java version of a popular board game in Java, and has it working for multiplayer on one PC with different turns for each player. He's mentioned he wants it to eventually ...
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1answer
2k views

Vector movement in space type game (Mouse rotation)

I'm having an issue with my movement in my 'game' prototype. It's basically not working and admittedly my knowledge with vectors is lacking. The issue I'm running into is that the ship won't move in ...
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2answers
1k views

Java: Tile-based Collision Detection with Rectangles

There are a few tile-based collision detection questions out there, but none seemed to suit my need. I guess I really would like to know why this method for collision detection isn't working. It ...