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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1answer
135 views

Move Box2D body towards mouse click

In a top down game using Box2D, I would like the player's Box2D body to rotate towards the mouse click, and then move to a point on mouse click (move, not teleport). I have worked out the rotation ...
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1answer
257 views

Organising data of a turn-based strategy

I'm intermediate in Java but novice in everything which is on the server-side. I've set myself a task to rewrite an old game, so learning Java is more fun. It is a space turn-based strategy. The ...
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1answer
45 views

Why is the Hiero font not coordinated to fit neatly in the display window?

I imported a font with Hiero and I draw the font like: font.draw(batch, "1", 0, 48); This is the resultant image: So the font it moved up to hit the bottom perfectly, but it doesn't touch the ...
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1answer
63 views

How to detect if players alter game files and stop them from entering the game server [duplicate]

as the question says. how can i check if a player modifies a file such as maps or spells in my rpg games that will be located as "/cache/spells", "/cache/maps" or "/cache/entities" and you get the ...
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1answer
75 views

How to Render an xml tile grid in java [closed]

So i decided to write my games data files in xml since a lot of people recommend it security wise for an online game, but how exactly does one render an xml tile grid in java? format will be as ...
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1answer
65 views

Slick2D re-starting particle system/emitter

I am trying to use a particle system/emitter in Slick2D to produce a thrust jet from a space ship. I can get the emitter running continuously without any problem, however I can't get it to run for a ...
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1answer
92 views

glVertexAttribPointer stride ambiguity

As a hobbyist junior game programmer, I have done multiple small OpenGL projects just to have fun with 3D. I've tested VBOs in C++ and in Java and I found something or rather understood Java tutorials ...
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1answer
83 views

Synchronization with game tick

I'm working on a multiplayer game and it's currently set up like this. It accepts packets from the client on the fly and does whatever processing it needs to. There is also a main game tick which is ...
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0answers
21 views

Intermediate AI for Java games [duplicate]

I want to know how to create good AI for a Java game, I'm still learning the language and I'm not an expert. I can do static AI but wanna know about writing an AI that follows the player and ...
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1answer
184 views

2D Tile Movement in Java

I have this tilemap and a player in my game, and I got the player to move by adding the velocity to the position. However, it is very hard to control the player exact this way of the tilemap. So, I ...
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0answers
75 views

Slick2d - Why is my init() method running twice?

In the init() method, I have called the method loadMap() from the "world" object. But it seems to be called twice. I do not want loadMap() to be called twice. I have no idea why is this happening. ...
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2answers
159 views

Mysql database reading and writing [closed]

In my Libgdx application I would like to be able to connect to a mysql server securely and read and write data from it without other users injecting, or changing information. I've found this: ...
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1answer
175 views

How can I render a JBox2D ParticleGroup?

I want to render a ParticleGroup from JBox2d using OpenGL. I've managed to define a particle group area, but I'm unsure how to draw the individual particles. Here's how I create the ParticleGroup: ...
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0answers
48 views

LibGdx - Rotate sprite with mouse [duplicate]

I'm trying to rotate the sprite with the mouse but nothing will happen. void mouseMove() { float angle = (float) Math.atan2(562 - Gdx.input.getY() - player.getY(), Gdx.input.getX() - ...
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1answer
161 views

Typing text animation (dialogue) libGDX or in general

Can anyone think of an efficient way to animate the typing dialogue text as found in pokemon? I have a vague idea of using string.length, and having a new letter drawn every .2 seconds or so, but ...
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1answer
128 views

LibGDX Touch Delay

So I'm trying to make a game in which you have to tap things fast, but the thing is - after you touch something (the area I chose), it takes like 2 more seconds to register another touch. Now, I think ...
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3answers
208 views

(LibGdx) Get mouse position in ENTIRE game [closed]

I'm trying to get the mouse position IN GAME. By that I mean not the position on the screen, but inside the window. I've been using Gdx.input.getX(), but that's not INGAME. How do I do this?
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2answers
101 views

Memory strategy for multilayer, tilebased maps

I am currently developing a 2d mmorpg and am having some memory issues with regards to my tile based map. The client takes a little while to load and then sits around 1GB ram, because I am loading ...
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1answer
69 views

Handle Entities & Collision in large numbers [closed]

I am creating a simple 2D maze game and I am a little confused about entities & collision detection. At the moment, my entity class is an abstract class containing position, velocity, sprite and ...
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1answer
137 views

How can I smoothly move from tile to tile?

I've looked at other games with tile based movement. I am aiming to create a game like pokemon, where the player moves smoothly to the next tile. I am using KeyAdapter, in my KeyInput class. This ...
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0answers
13 views

How to loop through tiles in libGDX [duplicate]

I just need a for loop to show me all of the tiles in a tiled map. for(Tiles t: thetilemap) { }
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0answers
49 views

Is there such thing as a design pattern for game character attributes? [duplicate]

I'm toying with the idea of a character based game. The characters, robots, monsters, heroes (and weapons I suppose) will all have various attributes as per a D&D game for example. They player ...
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1answer
111 views

Rotating and scaling textures built up of pixel arrays in java?

I'm making my first real game, in Java, and I'm currently working on the base system, for rendering images (sprites) and I wonder how I can rotate sprites. My sprite class looks like this: ...
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1answer
158 views

how to remove game objects after on overlap in LIBGDX game

I have gold stars in my game that give score to game hero if the hero overlap with the star. What I want is to remove star once it overlap with hero object. I give score by checking overlap with this ...
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1answer
104 views

Drawing shapes and images in libgdx dialog

I am currently working on a dialog window for my android game using libgdx. This dialog window contains a collection of labels and buttons, but should also contain an image. The image represents the ...
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0answers
72 views

Broken World Generation [closed]

I am learning to write java/mod Minecraft. The mod I am working on is just a "Can I do it?" Kind of thing and I have no intention to distribute it. The problem I ran into is when I try to generate a ...
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2answers
96 views

Make square walk by rotating around corners

I in the very beginning of making a small game, and I'm having some problems getting the basic movement of my character. My character is a square that can be moved by rotating around a corner. The ...
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0answers
82 views

Slick2D ComponentListener added to MouseOverArea not responding to right mouse clicks

I am developing a UI using Slick2D and experimenting with MouseOverArea. I have noticed that if I add a ComponentListener to my Button (which extends MouseOverArea) it only responds to left-clicks on ...
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2answers
130 views

Boost per-pixel rendering

I'm writing my own renderer in pure java without any external libraries. I'm using per-pixel rendering. I'm rendering an image with this method: public void renderImage(int x, int y, RawImage image) ...
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0answers
25 views

rotate to movement direction [duplicate]

If I have a player character that can move 8-directionally, I can set the rotation of the player to face the direction of movement. But if I want to smoothly rotate to a direction, sometimes the ...
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1answer
119 views

Delta time not accurate enough

In my game i have a delta timer based almost exactly on the page from here http://wiki.lwjgl.org/index.php?title=LWJGL_Basics_4_%28Timing%29 But if the the main loop is fast enough, my delta time ...
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votes
1answer
157 views

Smooth Npc Movement

I have an Npc in my rpg that moves around based on a Random() variable. My main goal is to have him walk in a random direction a small bit every 2 seconds. I only want him to move about 32 pixels ...
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0answers
52 views

How to eliminate the outline in libgdx?

I'm recently started working on a game in libgdx, and I've run into the problem that my sprites tend to get a thin, whitish outline around them. This is especially a problem for me since I'm working ...
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2answers
140 views

Optimizing Collision Detection in a 2D Game

I am optimizing my "little" Java (LibGDX) shooter game, and perhaps unsurprisingly, collision detection is a "bottleneck"; I've kind of reached my performance goals already, but I want to tweak the ...
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1answer
89 views

Why would OpenGL ignore GL_DEPTH_TEST setting?

I cannot figure out why some of my objects are being rendered on top of each other. I have Depth testing on. glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LEQUAL); Do I need to draw by order of what is ...
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0answers
81 views

Lag when drawing single Texture multiple times in libGDX [closed]

I am building a game where you are basically drawing little dots on the screen with the help of the accelerometer. I am using a single instance of an Actor where I store the coordinates that needs to ...
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2answers
84 views

How to determine this kind of vector?

Take a look at the picture. I've got a camera(brown) and its ray(red). As I know ray has a direction and unlimited length(if you don't set it yourself). But now I need to determine ray's vector ...
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1answer
126 views

How to draw multiple large background images using libgdx?

I have developed a basic lunar lander-style game using Slick2D and dyn4j and am now redeveloping it using libgx for various reasons. I am having problems drawing the background (i.e. everything, but ...
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votes
1answer
58 views

Why isn't my aspect ratio calculation working on Android platforms?

I have this method: public final float aspectRatioHeight(float originalW, float originalH) { float newHeight = (originalH / originalW) * (Gdx.graphics.getWidth()-20); return newHeight; } To ...
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1answer
100 views

Does compressing data before transfer make a game run faster?

I want to make my game as fast as possible as it is real time and fast paced. I have already decided to encrypt my data here and I was wondering whether compressing it would be faster for the client ...
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3answers
169 views

Is it worth it to encrypt data?

I am using Java to write a moderately simple video game and I need to transfer some large files (edit: Live game data and possibly assets.) between the client and the server. I need to decide whether ...
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vote
2answers
199 views

How can I attach a libGDX actor to a box2D body?

I'm creating game like hill climb racing. I created my car with the help of shapes and joints but I don't know how to attach graphics to it. I used actors and sprites before for the sake of learning, ...
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0answers
40 views

GPU skinning weird issue [duplicate]

I finally got my GPU skinning to work! (Mostly) I'm using MD5 format and this here tutorial However the weird part is that I'm getting EXACTLY the same issue as this unanswered post: here The ...
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1answer
82 views

How do you save Path2D data?

I am making a java game using path geometry. Is there any way to save the data stored in a Path2D to a file?
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votes
1answer
396 views

Sprite rotation LibGDX

I'am using the current mouse position to aim the player sprite, but I am not getting the best results. I want my sprite to have the direction pointed wherever my cursor is in the screen. Here's my ...
0
votes
1answer
69 views

Get color array with alpha for an image in java

I can get the pixel array like this: int[] pixels = image.getRGB(0, 0, width, height, null, 0, width); But it ignores the alpha channel, I only get the rgb (I'm reading a PNG image). How can I get ...
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0answers
32 views

Radial gradient is not transparent at edges

I have a circle drawing algorithm, which is this: public void renderCircle(int xp, int yp, int r, int color) { int[] pixels = surface.getBuffer(); for (int y = -r; y <= r; y++) { ...
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1answer
81 views

Transparency on pixel level?

I'm using java and I do pixel-by-pixel rendering (a pixel array from an ARGB BufferedImage). So a color is 0xAARRGGBB. Now how can I render a transparent color? I guess that I should manipulate the ...
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0answers
31 views

Box2DLight position seems to Floor

I am creating a top down game and i'm using raycasted lights from Box2Dlights, My light is all set up and working. its attached to the player's Body, and when the player moves, the sprite I attached ...
0
votes
1answer
129 views

Java 2d Gaming, best practice to update random falling objects

I'm new to game development. I do have basic knowledge in Java and also have moderately good experience in OOP from other languages. I started developing this simple 2D game as my first project. The ...