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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how to do picking in 2d lwjgl

I searched the whole internet, but I couldn't find something useful. How to do picking (like ray picking) in lwjgl in orthographic mode (2d)? I think this is less confusing than picking in 3d, but I ...
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1answer
96 views

Is this the correct way to detect ray-sphere intersection?

I have this java function that should return a true or false for any sphere passed to it if they intersect. However it seems to end being true a lot of the time when it shouldn't and false sometimes ...
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2answers
123 views

Efficient way to check collision with potentially hundreds of objects [duplicate]

I am trying to make a top down shooter that could potentially have hundreds of objects at once at one point. I need to check collision with projectiles, walls, and enemies. I am currently using ...
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1answer
71 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 ...
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1answer
78 views

Java Scrolling 2d Block game - Optimise my code?

I have a 2d game where you look down from above and can scroll up, down, left and right using a viewport and a much bigger map. I have been having trouble drawing a rectangle around the block under ...
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1answer
24 views

Actors (Label) not being drawn to stage [closed]

I have a weird issue that when I try to draw a Stage with only an Actor, a Label to be more precise, added to it and nothing seems to be getting drawn. This is how my setup goes: I have a Sprite ...
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3answers
149 views

Tile map propagating fire

I have a Model(I use the MVC pattern), that holds an 2D Array with Tile objects. A tile object have a member, whether it burns or not, a member how long it takes until the neighboring tiles get fire ...
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1answer
43 views

How can I check for key releases between keyReleased callbacks?

Slick2D's Input class has a isKeyPressed() method that returns a boolean value according to whether the specified key has been pressed. I want to check if a key has been released in the same fashion. ...
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1answer
61 views

Run menu in gameloop or as activity?

Currently I am running my menu (with buttons "new game" and "choose level") as an xml view of an activity, that then starts my gameactivity with custom view run on a gameloop. But Im starting to see ...
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1answer
99 views

Data structure fo a ship like in Faster Than Light

I am wonder me, whats the best data structure for a ship like in FTL. At first I thought its easy and I need only to make a array with the rooms(Tiles). But than I noted, that I must put somewhere the ...
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0answers
30 views

How can I draw a part of a texture in slick2d?

I know the method for drawing a region of a texture in slick2d: image.draw(x, y, srcX, srcY, srcX2, srcY2); But I have no idea how the texture coordinates work. To draw a region of x:16, y:16, ...
4
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1answer
153 views

How do I make a cube move by rolling?

I am learning jMonkeyEngine by making some small games with it. I have a simple rectangular cube that I want the player to be able to roll around the game world. When he presses the arrow keys, the ...
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2answers
193 views

libgdx - collision detection with tiled map java

currently, I am working on a 2d rpg game which is similar to final fantasy 1-4. I can load up a tiled map and the sprite can walk freely on the map. However, I will like to create a wall for it to ...
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2answers
142 views

Random movement avoiding walls

I have a top-down game you can scroll through placeable tiles I have some NPCs that do nothing at the moment I want them to freely move around without going through wall tiles etc. For the freely ...
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2answers
126 views

Tile map collision and object handling

I want to program a game. In this game there is a tile map and objects that interact with it and them self. For that I made first a TileMap class, in it is only the data of the tile map. Its a very ...
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1answer
87 views

Change game from portrait to landscape dynamically

I have multiple classes that implement Screen. I want to, say, have the Main Menu screen portrait, then the Play Screen landscape. Is there anyway of changing the orientation dynamically? I thought ...
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1answer
95 views

How should I implement a Game Over menu in Android?

By Game Over menu, I mean a menu displayed when you die, with an option to play again. I have two approaches in mind: Use OpenGL Have some button textures ready. When the character dies, draw ...
2
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1answer
54 views

Libgdx Get Font Height with a Wrap

is possible to get the 'Height' of a font drawed with the drawWrapped methods (with a wrapWidth) ? getMultiLineBounds only works when \n is used, but when drawing with drawWrapped it doesn't give the ...
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1answer
75 views

How to make platforms spawn without touching other platforms

So I am making a doodle jump like game where there are platforms scrolling by but right now how I have platforms spawning is completely random. I would like the platforms to be spread apart so they ...
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1answer
158 views

how to implement A Star path finding on 2D map with large tiles

The map tiles I have im my game are 64x64 pixels, and the characters are 16x16 pixels. I was reading about A Star path finding and I was wondering if I need my tiles closer to the size of my ...
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1answer
40 views

Stop diagonal selection in my Match-3 game [duplicate]

I have a matching game where the user drags their finger over items to select them. The problem is, i only want the user to be able to select items by dragging vertically or horizontally, not ...
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0answers
27 views

Java JOGL NEWT Window without FPSAnimator

how I am new to OpenGL and especally with JOGL. I currently try to learn JOGL. I dont like to create a special thread that runs the display method of my window, so I called it manually. public static ...
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2answers
116 views

Circular dependency when creating entities

I have the following problem: I have a a class called Stage, that keeps an list of entities, which it iterates over every update loop, and updates them. One of these entities might be a weapon (PEW ...
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2answers
122 views

How can I create delays for sprite animations that work correctly when the application is killed and restored?

Please see my original question here: How should I use system time to compute delay times without stutters? In summary, I am attempting to to introduce a delay (say of 5 seconds or so) before a ...
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1answer
192 views

Fog Of War - Is looping over every tile inefficient?

I'm trying to optimize my static FOW code for my 2D tile-based game and the bottleneck seems to be in the rendering of the fog (rather than the circle drawing algorithm or other aspect of the code). ...
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0answers
82 views

Polygon Collision Response

I'm working on a game engine that has a built in custom physics engine (I know it's a waste of time, but I have years to make this, so why not make it good?). Currently, with any number of polygons, ...
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1answer
82 views

Strange collision in Breakout [closed]

My Breakout game works fine so far, but I struggle with the collision detection... Well... just with the collision from the ball with the brick... Here's the relevant code: List<Brick> ...
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3answers
131 views

How do I implement Breakout's “multiball” powerup?

I'm just starting out and making a breakout clone as my first game. I'm implementing all kinds of powerups, but I'm stuck on multiball. The powerup adds additional bouncing balls to the game. So far, ...
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0answers
43 views

Java Angle Math: Calculate how near the player looks to an entity [duplicate]

I am programming a Minecraft Bukkit plugin and need a way to calculate an input number from 0 to 360 for displaying a custom compass / radar. So if the player directly looks at the object (shouldn't ...
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2answers
76 views

Slick2D: constructor vs. init method

What is the difference between the constructor of a BasicGameState and the init method? It appears that they are both called at the same time when the BasicGameState is registered in StateBasedGame, ...
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1answer
72 views

How do I double-buffer renders to a JPanel?

I'm trying to make a little breakout game with Java and Swing. The only issue so far is that drawing on the JPanel causes lots of flickering! The relevant code: JFrame frame = new ...
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2answers
229 views

Why can't I set a single value in a game map Java 2D array? [closed]

I'm trying to set one character on 2D array. map[0][2] = "0"; However, I'm getting 11011 11011 11011 11011 ... I was expecting 11011 11111 11111 11111 ... What am I doing wrong? another ...
2
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2answers
153 views

Expandable 2d environment by spawning and controlling individual tiles

what is the best way to implement an environment that is "expandable" in every direction so that when the player moves in any direction a new row or column of tiles that can be manipulated ...
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50 views

LWJGL Rotating is moving

I am trying to rotate my QUAD even just a little bit. I have read pages like http://www.java-gaming.org/topics/lwjgl-tutorial-series-moving-and-rotating-triangle/30679/view.html In my render() ...
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1answer
68 views

What's the best way to time a character AI movement on android/java?

I'm creating an android game and I'm trying to figure out the best way to time a character position change, something like this: public void move() { //this.posX += 5; this.posY += 5; if ...
1
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1answer
39 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 ...
5
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3answers
220 views

How do I send multiple matrices to a vertex shader?

I'm practising animations using bones/skinning. I am trying to send the shader one matrix per vertex. I can think of these two approaches. Method 1 I have one uniform handle for each bone matrix ...
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0answers
21 views

Box2D Joints Disconnect

I'm trying to make a soft body physics system using rigid bodies in a circle. I'm having a problem where my joints only connect to one of the bodies, and seems to disconnect from the others. I think ...
0
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1answer
46 views

One InputProcessor for two controllers

On my screen I want to display two controllers, one to turn around the character (We'll call itLook) and one to move the character (We'll call it Move). I have a line registering a ControllerListener ...
2
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2answers
137 views

How do I create a horizontally centered “gravity line”?

Here's my ideal scenario: A game object (in blue) can change its horizontal velocity, but it will be pulled back by gravity (dotted gray arrows) toward a central vertical line (in red). How can I ...
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1answer
197 views

Can I programmatically generate textures in java?

Is it possible to programmatically generate textures in Java, textures that could then be used to cover in game objects?
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2answers
189 views

Should game objects draw themselves? [duplicate]

Assuming you have classes like Player, Enemy, Map and Tile. The first approach to structuring rendering code would be to give each a render() method and let it draw itself: void render(){ ...
0
votes
1answer
72 views

Calculate The Proper X and Y Coordinate

I have a class called Tile, the constructor takes an integer that represents the tile's type. You can load a tileset ( via loadTileset() ) which initalizes the fields - tileset numOfTiles tileWidth ...
0
votes
1answer
75 views

Grid collision - finding the location of an entity in each box

I am trying to implement grid-based collision in a 2d game with moving circles. The canvas is 400x400 pixels. Below you can see the code for my Grid class. What I want it to do is check inside which ...
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2answers
139 views

Create a tornado like particle movement, based on velocity

For context i'm using Java and Minecraft Forge, however the concept should be fairly standard. To spawn particles you use this function... world.spawnParticle("largesmoke", posX, posY, posZ, ...
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votes
2answers
68 views

How to calculate a bounding rectangle of a polygon?

Polygon poly = new Polygon(); poly.getPoints().setAll(5d, 15d, 15d, 25d, 5d, 30d); How do I calculate the Polygon's height and width? There is no poly.getWidth() or poly.getHeight() method in ...
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2answers
37 views

LWJGL Jumping Down [closed]

I'm currently building a little game using LWJGL, and I got a Game class which contains my game loop, instances etc... And a Player class which contains a constructor (for x and y coords), logic ...
0
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1answer
142 views

How do I move the camera in 2D LWJGL openGL?

I am making a top-down rpg game with the LWJGL but I can't figure out how to make the camera follow the player. I've tryed using GLU.gluLookAt() but it seems to be designed for 3D and when I try it ...
0
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1answer
137 views

Game Structure in depth [closed]

I've been curious about game structure for some time now. Does everyone who is a game programmer come up with there own approach to structure there game, or is there like some sort of defined layout. ...
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0answers
39 views

Lateral Friction Phisics

I am trying to create a physics engine for my game, and need to cancel out any lateral velocity for when entities turn. I have tried to mimic this page's example, but it is not working. I have objects ...