Questions tagged [java]

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

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9
votes
2answers
11k views

How do you determine which object/surface the user's pointing at with lwjgl?

Title pretty much says it all. I'm working on a simple 'lets get used to lwjgl' project involving manipulation of a rubik's cube, and I can't figure out how to tell which side/square the user's ...
64
votes
8answers
78k views

Is Java viable for serious game development? [closed]

I have scoured the internet, but there are not very many resources for Java game development, not nearly as many as C++. In fact, most engines are written in C++. I tried to play a game made with ...
15
votes
3answers
20k views

Is there an algorithm for a pool game?

I am looking for algorithm to calculate direction and speed of balls in a pool game. I am sure there has to be some type of open source code for this since pool games are some of the oldest computer ...
11
votes
2answers
23k views

How can I move a sprite in the direction it is facing?

I'm using Java/Slick 2D. I'm trying to use the mouse to rotate the sprite and the arrow keys to move the sprite. I can get the sprite to rotate no problem, but I cannot get it to move in the direction ...
16
votes
1answer
16k views

Making a HUD/GUI with OpenGL (LWJGL)

I'm at the stage in my game development where I need to make a HUD or GUI. I've never gotten to this part, so I don't know how its done. I tried rendering a simple quad at a fixed position on the ...
6
votes
4answers
7k views

Which Side Was Hit?

I am working on an Android game and I have two objects A and B (both rectangles) and when they collide I simply want to know which side of B was hit. I have detected the collision fine, but I am ...
12
votes
1answer
861 views

When and why is a Pool class needed to hold objects?

I've been studying opengl es and an example I saw was using a "Pool" class to keep track of touch and keyboard events. Could someone please explain how and why a pool class is needed. From what I was ...
5
votes
3answers
6k views

Why is my velocity decaying?

Programming in Java. Tinkering around with physics. My entities all have position and velocity. In the main loop, all I'm doing is applying gravity and bouncing off the edges, like so: ...
6
votes
1answer
423 views

LWJGL Eclipse Resource Deployment

I'm still experimenting with some OpenGL in LWJGL, and as I get to know more and more about OpenGL, I start to do more complicated things like multi texturing, shadowmapping and more. Now, right now I'...
11
votes
4answers
4k views

Should I move the world or move the player?

I'm about to start developing a sidescrolling game where the player's goal is to travel as far as he can in the horizontal axis before touching down. Note that I do not need to ever travel back on the ...
6
votes
3answers
1k views

How can I change this isometric engine to make it so that you could distinguish between blocks that are on different planes?

I have been working on an isometric minecraft-esque game engine for a strategy game I plan on making. As you can see, it really needs some sort of shading. It is difficult to distinguish between ...
2
votes
2answers
4k views

Adding a short delay between bullets

I'm having some trouble simulating bullets in my 2D shooter. I want similar mechanics to Megaman, where the user can hold down the shoot button and a continues stream of bullets are fired but with a ...
21
votes
2answers
8k views

How can I define items in my RPG like Java game?

I am casually working on an RPG type game in Java but I am having trouble figuring out how I can have items that can do many different things without creating a different class for every item. As an ...
37
votes
6answers
19k views

What is a good file format for saving game data? [closed]

I need to save some custom game data. Map, player, etc. All of them will have "sub objects". For example, a map and map will have an "array" of tiles. ie, hierarchical data. Hopefully nothing ...
35
votes
7answers
18k views

How can I improve rendering speeds of a Voxel/Minecraft type game?

I'm writing my own clone of Minecraft (also written in Java). It works great right now. With a viewing distance of 40 meters I can easily hit 60 FPS on my MacBook Pro 8,1. (Intel i5 + Intel HD ...
19
votes
3answers
12k views

Polling vs event driven input

I'm developing a game using polling for the input method. However, now that I'm delving deeper into the game menus and other UI components, I'm finding that I'd probably like to have event driven ...
10
votes
2answers
15k views

Breakout Collision: Detecting the side of collision

I am writing a breakout clone (my first game) and am totally stuck as to how I figure out which side of the brick was hit. I have a collision detection method that looks like this: ...
3
votes
1answer
6k views

Making an efficient collision detection system

I'm very new to game development (just started 3 months ago) and I'm learning through creating a game engine. It's located here. In terms of collision, I know only brute-force detection, in which case,...
12
votes
3answers
90k views

Does Unity let you code in Java? [closed]

I am fairly new to Unity3D experience , but I have a very good knowledge of Java and Android development. I am really confused that if Java is at all needed for developing android applications? I read ...
13
votes
6answers
20k views

How do I shuffle cards for a card game?

I am trying to develop an card game for Android Can anyone suggest me how to write code for effectively shuffling the playing cards?
9
votes
1answer
1k views

Appropriate level representation / data stucture for a 2D platfrom game?

I'm about to program a copy of Mario in Java. I'm thinking on 2 representations/data structures for the levels but I'm not sure which one should I choose: A 2D integer array. A quadtree to divide the ...
2
votes
2answers
1k views

How do I use a JBox2D ContactListener to check if my character is standing on the ground?

I want to know when my character is touching a wall or floor. I've had no luck searching for information on this. I saw a few things about ContactListeners and <...
14
votes
2answers
2k views

How do I create a World Healing Wave effect?

I want to change my dark and depressing background to a happy grassy background, in real-time, such that the happy background is shown in a radius around a game character. A forcefield of happiness, ...
3
votes
2answers
4k views

Can you help me find resources for developing a top-down 2D game in Java? [closed]

I just started reading about games, and I'm going to develop a game where a person is moving around on a 2D map. My preferred language is Java. Is that suitable to develop games? I'm going to ...
2
votes
1answer
472 views

When should I load assets for optimal performance?

I'm writing a game using LWJGL and Java, and was wondering if there were best practices for when to load resources. I have seen examples that load all resources when initializing the game (XNA), ones ...
1
vote
2answers
1k 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 ...
15
votes
1answer
6k views

A* navigational mesh path finding

So I've been making this top down 2D java game in this framework called Greenfoot and I've been working on the AI for the guys you are gonna fight. I want them to be able to move around the world ...
16
votes
8answers
7k views

How do I create tileable solid noise for map generation?

Hey guys, I'm trying to figure out how to generate tileable fractals in code (for game maps, but that's irrelevant) I've been trying to modify the Solid Noise plug-in shipped with GIMP (with my ...
13
votes
2answers
4k views

How do I tackle top down RPG movement?

I have a game that I am writing in Java. It is a top down RPG and I am trying to handle movement in the world. The world is largely procedural and I am having a difficult time tackling how to handle ...
14
votes
2answers
14k views

How To: Java Game to Steam Greenlight

I am planning to create an indie game using Java and Eclipse IDE and I want to put the finished product to Steam Greenlight. How does the whole process work after the game is finished and running ...
7
votes
1answer
39k views

How can I make a sprite-sheet-based animation system? [closed]

I want to make animations based on a sprite sheet, but I'm stuck implementing it. The key things I need my code to do are: Play through a set of images once (e.g. a jump animation) Loop through a ...
5
votes
1answer
8k views

Sphere-Sphere intersection and Circle-Sphere intersection

I have code for circle-circle intersection. But I need to expand it to 3-D. How do I calculate: Radius and center of the intersection circle of two spheres Points of the intersection of a sphere and ...
6
votes
4answers
13k views

2D Platformer Collisions

I've basically asked this question before, and I know it's been asked probably a billion times, but I still can't seem to do it. All I want to know is how I should go about doing basic 4-way, ...
4
votes
2answers
7k views

Arc'd jumping method?

Okay, so I'm making a platformer, and I wanna know how I can make a arc'd jump easily. Like what Mario does in super Mario Bros 1. Any ideas on a simple way to accomplish this?
13
votes
2answers
3k views

How do you handle uneven tiles while rendering a tile map?

Here is what I want to do with my tile map that I am unsure of. As you can see the top walls are way larger then the bottom and side ones (this is also an issue with my corners which are odd shapes [...
8
votes
2answers
5k views

Smooth movement in a tile based game

How can we make our character move smoothly across tiles? He moves tile by tile, but that looks unprofessional. In addition, when you hold down the arrow keys he zips across the screen. How can we ...
8
votes
2answers
5k views

How to handle pixel-perfect collision detection with rotation?

Does anyone have any ideas how to go about achieving rotational pixel-perfect collision detection with Bitmaps in Android? Or in general for that matter? I have pixel arrays currently but I don't know ...
3
votes
1answer
2k views

How to create a projectile motion of a cannonball in top down view?

Objective To move the bullet with projectile motion to specific destination by touch point. In the below image is an example of a bullet which has a projectile motion. On my observation, the bullet ...
2
votes
2answers
5k views

Making a player move to my mouse when clicked?

How can I get my player to move to the mouse when it is clicked (like in Warcraft)? So far I have tried: ...
14
votes
6answers
2k views

Am I hurting myself by not knowing C++ for game design? [closed]

Right now, I feel I am strong in both Java a C#. (Not much of a leap from one to the other really). While I don't expect a game designer/programmer is an attainable goal early on in my career, This ...
5
votes
3answers
3k views

How to Align Gun with Bullets

I have a top-down 2D shooter. I have an image of a player holding a gun, that rotates to face the mouse. Please note that the gun isn't a separate image tethered to the player, but rather part of the ...
9
votes
3answers
8k views

Mods for Minecraft Server - how does it work?

Minecraft server comes as a single jar. How are mods developed? How do they interact with the original jar? What is there under the hood? What technologies are involved there? I'm mostly a C++/Python ...
9
votes
2answers
16k views

How do I find the angle between two vectors?

I have 3 points on my screen: ...
7
votes
2answers
3k views

How to store 2D tile-map

I want to create a 2D map composed of small tiles, that should look like voxels (eg. this just from side). I think I can make a structure like Voxel2D, that have int X, Y and some Color, and every ...
6
votes
1answer
4k views

Circle-Rectangle collision in a tile map game

I am making a 2D tile map based putt-putt game. I have collision detection working between the ball and the walls of the map, although when the ball collides at the meeting point between 2 tiles I ...
5
votes
3answers
2k views

Java Anti-Cheat Framework? [closed]

Are there any anti-cheating frameworks for Java games in order to make it a bit harder to cheat? (eg. something that protects from things like Cheat-Engine) Obviously if the cheater were to develop ...
4
votes
2answers
845 views

Predicting Enemy Movement

Well I have a simple 2D game where all positions are defined by and X and Y coordinate. There are objects moving at a constant velocity. And a turret fires a bullet at the X and Y coordinates of the ...
3
votes
3answers
5k views

Using random numbers with a bias

I appear to be awful at describing the question so I'll try and describe the problem. I want to add a random amount of heads to my creatures but I want to be able to determine several things. a) The ...
2
votes
1answer
2k 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 ...
1
vote
1answer
17k views

How do I decompile Minecraft?

I'm trying to get started modding Minecraft. I opened up the minecraft.jar file in Eclipse, but it doesn't contain what I expected. In this tutorial the presenter ...

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