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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How do you make bullets move at an angle in different angles using delta

I'm having trouble making my bullets move at a steady pace using delta. I have the formula I used outside of slick2d, but it doesn't take delta into account. My bullets fly fast. How do I make them go ...
4
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1answer
3k views

Access vertex data stored in VBO in the shader

If I wanted to store extra data in a VBO for skinning (indices for indexing into an array of matrices of bones and floats for applying weights to those bones) How would I go about accessing that data ...
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2answers
2k views

How to efficiently manage animations and/or textures (resources) in a game?

I am using Java, particularly the Slick2D library. Seeing as this is my first game, I have no idea how I should manage the Animations and the textures in the game in a way to be both memory efficient ...
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1answer
2k views

How can I accomplish Pokemon-style movement over tiles in java?

I'm talking about where if you press a directional key once you walk over to the adjacent tile and can't do any other actions during the walk. I can get my character to move one tile width, but my ...
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1answer
254 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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2answers
1k views

Disadvantages of using multiple versions of OpenGL in LWJGL?

So, I'm trying to figure out LWJGL, and my goal is to use OpenGL 3.2 (because pretty shaders are pretty). But in every tutorial I can find for LWJGL, they import a bunch of different OpenGL versions ...
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1answer
230 views

Should I amortize scripting cost via bytecode analysis or multithreading?

I'm working on a game sort of thing where users can write arbitrary code for individual agents, and I'm trying to decide the best way to divide up computation time. The simplest option would be to ...
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1answer
710 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
480 views

Player position triggering teleports

I'm developing a Minecraft plugin (bukkit) in which a server admin can create 'portals' - a small region that will teleport any players who enter it. I have the teleportation sorted and I know how I ...
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1answer
1k views

Java2D Game Flickering

I'm in the process of trying to get familiar with making games in Java, using the Swing library. Coding my Snake game however, I've got to a point where the game is flickering/ghosting and I haven't ...
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2answers
498 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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2answers
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I have created character human in blender. How to use it in Java/Android

Title says it all pretty much. I can't find anything online which explains it in details. I have created a character model in Blender and I want to use it in Android app. I want to make it move. ...
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1answer
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How to make NPC AI for my jme3 ninja game

My scene has a main character who is a ninja and an enemy which is a goblin and one monster but the monster has no animation so we can wait with him: How can I make the goblin actually move instead ...
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1answer
637 views

Choosing the right game engine [closed]

1 down vote favorite I'm trying to create a game in java inspired by a Gameboy Color Zelda game. I'm exprienced in java but not in game programming. I've been doing a lot of research on game engines, ...
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5answers
6k views

How do i choose what technology to use for a 2D game like Pokemon? [closed]

I apologize in advance for the wall of text about to come. I've had an idea for a game for a while now, and am stuck at step 1 of game development: Choosing a language/engine. I've read a whole ...
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1answer
357 views

Invert colors Java rendering

I am making a 2d platformer in java using the slick2d engine. I only use 2 colors: black and white. I want to implement a feature were i invert the colors of certain entities. However i can't find a ...
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0answers
475 views

How do you program the right analog stick of a controller in JInput?

I have the Left Analog Stick programmed and accepting input (moving a character around). (getCompassDir() returns the values of the cardinal directions and NONE means the stick isn't touched): // ...
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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 ...
4
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3answers
3k views

Android “Activities” — one or many for games?

I've been learning Android in my spare time, and one of the first things every tutorial/guide will introduce to you is the concept of an "Activity." Everyone loosely defines an Activity as a screen ...
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2answers
3k views

Menus for LWJGL - Swing or other? [closed]

Okay so I want to create a main menu which includes several buttons and text fields, is there a built in library for LWJGL or would I use normal Swing and start a thread of the application? Its a 2D ...
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1answer
1k views

Trouble programming JInput for game controller

Due to lack of reasonable documentation, I have not been able to program inputs for using a game controller. The most I have ever found was how to detect if a controller is found and what it's name ...
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1answer
1k views

Managing Game States

I'm thinking about making a StateManager for my game. I want to know how to design it; that is, how to use a stack to push and pop states onto, and draw them to the screen. For example, should each ...
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2answers
402 views

IOException java problem

I'm working through the Head First Java book, and one piece of code it makes me write looks like this: import java.io.*; public class GameHelper { public String getUserInput(String promt){ ...
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3answers
557 views

Saving and loading large tilemaps

As the title state, I have a large tilemap 400 x 400 x 26. Which currently just about fairs when using it. Saving takes a couple of seconds and it saves to a .ser file which is okay at the moment ...
2
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3answers
201 views

Positioning entities in adjacent maps

Say I have a 2D tile based game engine (I don't, but I will soon). I was wondering how I would manage drawing adjacent maps. That is, imagine we have a map that is 50 by 50 tiles wide. Then next to ...
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3answers
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Is there any Card Game Framework? [closed]

Please let's avoid the discussion of creating/using a game framework or not. I would like to create a small framework for card games or use one if it exists. Does anyone knows one? Preferably ...
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2answers
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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 ...
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6answers
4k views

How to implement object velocity as a vector

I'm working on a Breakout game, and want to change the ball's movement code from how I currently do it, to something based on vectors (as I feel learning and implementing movement based on vectors ...
2
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2answers
503 views

Ray Picking: how can I find which copy of model to pick, if they share the same vertices, but each one is translated before being drawn?

I have a scene, in which I am drawing few different objects - each one has the same vertices and each one is translated to proper place before being drawn. While using libgdx (but I think that this ...
3
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2answers
817 views

Stop map from scrolling but let player still move?

I have a basic method of scrolling around on a map (moving the map instead of the player), but at when the player gets to a certain proximity to the edge, how do you stop the map from scrolling, but ...
5
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2answers
2k views

How to get smooth transition within slick?

When a player clicks start, my app immediately switches to the first level. My question is how do I incorporate a smooth transition within Slick?
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1answer
4k views

How do I play background music in Slick/LWJGL?

I'm trying to play music in the background for my opening menu, but cant seem to find a tutorial specifically on how to play a music file. Does anyone know how this can be accomplished?
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1answer
638 views

Rendering Loop Problem (Java)

I'm not new to programming, but I am relatively new to game programming. I am trying to create a version of Breakout, as a good basic game to get myself introduced to 2d game programming. I currently ...
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2answers
827 views

Design pattern for creating multiple enemies

I'm currently attempting to implement a factory method pattern for creating multiple different enemies after loading data from a file. But I'm having second thoughts on what would be the best design ...
5
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3answers
2k 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 ...
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1answer
204 views

loading a sequence of obj in java

I have 90 obj for an animation and currently using LWJGL. How would I be able to load them in sequence for 3000 seconds (a frame every 33 milliseconds)?
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2answers
192 views

Collision detection not working properly

I have some problems with collisions, the collision detection only works either on one x "line", or on one y "line". Example Heres the collision code: public void checkCollision() { for (int i ...
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3answers
394 views

Best practice for saving items?

In a game that I'm working on, any player has (at max) 460 items within their inventory. Each item has simple attributes, such as owner and quantity, but equips have different attributes, such as ...
2
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3answers
2k views

Text fields in a java canvas

So I'm trying to have some form of input in my game and I understand all the keyPresses and whatnot but the only issue is I have no idea of adding a textfield to the game. JTextfield doesnt seem to ...
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4answers
3k views

Why does my frames per second function return inconsistent results?

I have a FPS function that: private static void runGameFPS2() { long beginTime; //The time when the cycle begun long timeDiff; //The time it took for the cycle to execute int sleepTime; ...
2
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3answers
855 views

Compressing 2D level data

So, I'm developing a 2D, tile based game and a map maker thingy - all in Java. The problem is that recently I've been having some memory issues when about 4 maps are loaded. Each one of these maps ...
0
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1answer
216 views

Java: Standing Animation

I've been working on a top-down, and the player already has animations for moving left and right. However, if I move a certain distance and stop, it will stop on the walking animation, which isn't ...
0
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1answer
206 views

How do I import Motionbuilder animation into my game?

I have an animation sequence for a 3D model built in Autodesk Motionbuilder. How would import the data for the sequence into my java game for my model? Is there any tutorial on how to accomplish this? ...
1
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1answer
1k views

Slick2D: Changing an Image's colour to Color.white

I am working on a game where we would like the enemies to flash white when hit by a bullet. Ideally, we would like to use the same mechanism to render an Image in any colour. Our Images are all png ...
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2answers
571 views

Moving AI in a multiplayer game

I've been programming a multiplayer game and its coming together very nicely. It uses both TCP and UDP (UDP for movement and TCP for just about everything else). What I was wondering was how I would ...
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2answers
102 views

Refresh a single view

The game I'm working on is based on different levels. I can use different activities or only one activity with different layouts ( or maybe only one layout, you have to apologize me but I'm studying ...
3
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1answer
373 views

Revamping my GUI to be more efficient and less brute

I am building a Java game from scratch right now. So far, it runs fine, but the issue is with my GUI and how it works. Basically, it's a tile-based game. Each time the person moves a different image ...
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3answers
1k views

Easiest way to create a 2d game in Java? [closed]

I would like to create a 2d game in Java, but tutorials online for game libraries such as LWJGL are usually filled with errors once I compile the project. Most people do not explain very well, and ...
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1answer
226 views

Tile engine Texture not updating when numbers in array change

I draw my map from a txt file. I am using java with slick2d library. When I print the array the number changes in the array, but the texture doesn't change. public class Tiles { public Image[] tiles ...
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2answers
291 views

Handling multiple AI updates for simultaneous movement

How would I go about having multiple AI on the screen all at once all calculating separate movements without too much lag and within sane working memory. Before I have had many on the screen by ...