Java is both a popular programming language and runtime environment which allows Java programs to run unchanged on most hardware and software platforms.
2
votes
1answer
70 views
Low FPS on Java drawing in BufferStrategy
I ran into a very strange problem while using BufferStrategy, I've tried searching for an answer but all I have found are non-relevant threads and discussions. So here is my query.
for (int i = 0; i ...
1
vote
2answers
3k views
How can i use A star pathfinding algorithm
How would i implement an A star algorithm for a game that i'm making on the android in java? i'm looking for a pre-made A star API in java with classes and methods to call. i don't want to have to ...
5
votes
2answers
315 views
Java 2D game programming: Different approaches to make a game loop
I am new to Java game programming, but the more I read the more I'm confused, because I've seen several different approaches to make a game loop:
1. The standard approach, that uses the Timer class ...
3
votes
2answers
159 views
Distortion Effect
I'm trying to make a distortion effect for a space game. The idea is that the effect has a central point, and all nearby objects appear to swirl into that point. I've made a preliminary version and it ...
0
votes
0answers
66 views
fire multiple events in InputListener
I have two Actors on my stage in libgdx and and both have a InputListener. I override the touchDown method and it works fine. My Problem is that when I press my Actor Z and a second later Actor Y only ...
4
votes
5answers
480 views
How to get more than one window in Java LWJGL
I'm trying to write a game in Java LWJGL. And I need more than one (multiple) display window. By default I've got one display window where I can draw everything. But I'd like to split some data to ...
1
vote
1answer
231 views
Managing sprite sheets for animation [closed]
I am trying to use a sprite sheet for animation but I'm having some trouble with my implementation. The three key things that I require my code to do are:
Play through a set of images once, for ...
1
vote
4answers
106 views
Java Slick2d collision feedback [closed]
I'm trying to build a collision response ( it uses vectors2f from slick2d ) so that enemies don't overlap on each other so basicly what I'm doing right now is, I loop trough all enemies in array ...
1
vote
1answer
186 views
Sidescrolling troubles [closed]
I'm making a sidescroller using java and Lwjgl. But I'm having some trouble getting the screen to actually ... well... sidescroll. The world is randomly generated and drawn in blocks. Like so:
...
0
votes
2answers
66 views
change bullets java
i need some help with java. i am creating a game where i have a player and he shoot bullets. u can also change u types of bullet.
bullets are just fillOval. and change types of bullets is different ...
69
votes
11answers
3k views
Float or int for currency?
In a simple business simulation game (built in Java + Slick2D), which is more suitable to store the player's current amount of money: a float or an int? Some information:
Most of the transactions ...
1
vote
1answer
85 views
Making different kinds of items [closed]
I want to create 2 items on the screen. Each item will be a differently colored rectangle.
item1 = green rect
item2 = blue rect
If the user gets the 1st item, it will print bullet1, which is the 1st ...
-1
votes
1answer
70 views
How should I store resources generated at runtime? [closed]
I in my game I generate some images at runtime depending upon the size of the text that will go over it. Right now I am storing these in a hashmap using a string resembling the text. The question is, ...
-1
votes
1answer
92 views
Creating 2D game engine, image = null error [closed]
When ever I run this, I get the error
Exception in thread "main" java.lang.IllegalArgumentException: input == null!
I tried many different solutions including moving parts of the code around and ...
3
votes
3answers
98 views
How do I undo changing the color of an image in Slick2d?
This code colors the enemy red:
enemies.get(i).image.setColor(0,1,0,0,1);
enemies.get(i).image.setColor(1,1,0,0,1);
enemies.get(i).image.setColor(2,1,0,0,1);
enemies.get(i).image.setColor(3,1,0,0,1);
...
1
vote
1answer
69 views
Java Slick2d Delta ( time )
In Java slick2d , i started printing out Delta which is supposed to be the time and it prints out is 16 or 17 forever, so how does this help me if i want to tell an object when it needs to do ...
-4
votes
1answer
111 views
I need help generating terrain for a 2D circle [closed]
How would you go about generating terrain for a circle. To be specific i am using a 5x5 .PNG as the thing or object that will fill the circle. At the moment i am having problems making the terrain ...
1
vote
1answer
171 views
Precise Touch Screen Dragging Issue: Trouble Aligning with the Finger due to Different Screen Resolution
Please, I need your help. I'm trying to make a game that will drag-n-drop a sprite/image while my finger follows precisely with the image without being offset. When I'm trying on a 900x1280 (in X ...
4
votes
2answers
169 views
3D models on 2D tilemap perspective when scrolling
I am creating a small top-down game, where the player traverses a 2D tilemap, with an illusion of depth provided by 3D models for things like buildings or trees.
Having gotten to the point where I ...
0
votes
0answers
62 views
Why does Slick import Tiled object rectangles without width, height, and name tags?
I tried using Tiled rectangle objects as walls with Slick's TiledMapPlus class, but as I soon realized that each GroupObject would return 0 for width and height. The code I used looks like this:
...
0
votes
1answer
247 views
Anti- Aliasing a small image?
As you can see above, I have an image of a game I've been working on using Java. Using AWT I added the following:
public static void drawImageRotated(
Graphics2D g2d, BufferedImage img, ...
2
votes
1answer
244 views
How do I efficiently generate chunks to fill entire screen when my player moves?
In my game I generate chunks when the player moves. The chunks are all generated on the fly, but currently I just created a simple flat 8X8 floor. What happens is that when he moves to a new chunk ...
3
votes
4answers
431 views
Better way to generate enemies of different sub-classes
So lets pretend I have an enemy class that has some generic implementation and inheriting from it I have all the specific enemies of my game. There are points in my code that I need to check whether ...
2
votes
1answer
185 views
2D Top down acceleration vector
I have been wanting to solve the issue of movement once and for all... with all that I have learnt and read through, should be a piece of cake one would have thought... , seems it isn't. Having ...
-1
votes
1answer
93 views
A paddle in my pong game isn't moving [closed]
I'm working on a little pong game in LWJGL but only one paddle moves. I've tried to switch around some code in the hopes it would work again but it still doesn't.
Here is my paddle class:
public ...
0
votes
2answers
130 views
How to I rotate a triangle by dragging the mouse in libGDX?
More specifically, I have rotation working in a way I don't like as follows:
//Draw the triangle using this draw method
//batch.draw(texture, x, y, ...
-1
votes
2answers
159 views
Lwjgl Random 2D Map Generation [closed]
First time poster here. I am somewhat (as in mid - low, closer to mid) experienced with Java but I seem to be having some trouble. I'm using the lwjgl library to make a "2D Minecraft-esque" game. ...
1
vote
2answers
73 views
Inputting Only Alphabetical Input - Slick2D
I'm trying to obtain the user input for when they enter their own name. However I would prefer to have it Alphabetically.
This is what I'm doing at the moment:
if (input.isKeyDown(Input.KEY_A)) ...
1
vote
1answer
73 views
Can't call method out of a timer. Why? [closed]
I have another problem i can't solve by myselve.
My situation:
I have four FrameLayouts in LinearLayouts.
I color them, set Layout hight and width at wrap content and just change the minwidth to ...
0
votes
1answer
95 views
Get back or delete an existing OpenGL object, then change it and draw at new. How?
With OpenGL i'm drawing for example a circle.
Can i take this drawn circle back out of the window and change something and then draw it back on the window?
Or can i /have to delete it and then draw ...
2
votes
1answer
86 views
Camera not strafing (GLSL)
I use this code in my GLSL vertex shader, where v_position is the vertex position:
gl_Position = v_position * u_camera;
and set u_camera as follows:
meshShader.setUniformMatrix("u_camera",
...
1
vote
0answers
120 views
How to make the background of an OpenGL object transparent?
It sounds so simple but i didn't get it to work.
The Background of my FrameLayout where i add the GLSurfaceView in is colored blue but there is only black.
So here is my method to initiate the ...
0
votes
1answer
77 views
Collision and gravity problems
So this is an easy question. I need to implement gravity in my game but where I'm stuck is what variables do I need in my Entity object for the calculations and a good algorithm that I can use for ...
1
vote
2answers
121 views
Removing the titlebar while using slick2d?
I recently started using slick2D in my gaming programs and a problem I have is not having the ability to remove the border/titlebar. I usually do this to create my own cutom look/ interface but if I ...
0
votes
2answers
79 views
Android bitmap placing
I've recently added an explosion in my game, for when enemies get killed, and it works fine and all, but the explosion wont "spawn" on the enemies x and y.
The problem is that I'm not drawing the ...
0
votes
1answer
67 views
Cost of changing scene in andengine
I'm working on a simple 2d puzzle with small textures (in count and quantity).
Now after I finished the game logic I'm considering tow options to switch between levels:
Remove all objects manually ...
7
votes
2answers
307 views
What's the best way to draw lots of trees
I'm writing an app which renders a random island planted with trees. The trees are currently two quads, criss-crossed and drawn with textures. I plan to have more complex meshes that form different ...
0
votes
1answer
52 views
How do I pass textures into a fragment shader in Slick?
I've written a shader that uses three different textures, tex0, tex1, and tex2. I can load it into Slick and successfully display it, but I can't figure out how to set the three different textures. ...
3
votes
1answer
203 views
The most efficient and accurate game loop?
Obviously for a game to work you need a game loop... Normally, my game loop would consist of something like this:
while(running){
update();
render();
Thread.sleep(10);
}
This seemed to ...
0
votes
1answer
60 views
Dependency setup between libGDX projects in Eclipse IDE
For my game I'd like to create another project that extends the functionality of libGDX and since it will be an independent project it could be easily reusable. How can I achieve this in Eclipse IDE? ...
0
votes
0answers
89 views
Is there any caution to take when coding a game in JAVA? [closed]
Are there any properties of JAVA that I should watch out for when coding a game? I've heard that some parts of JAVA can be resource-intensive, like when JAVA handles garbage collection
1
vote
4answers
146 views
Checking game objective status in efficient way on each update call
I am creating a 2d mobile game where there are three levels. Each level has 20 objectives. This can increase in the future.
Examples:
Level 1
Current Objective: 2/20
Objective : Collect 1000 coins
...
3
votes
2answers
107 views
How To Correctly Extend the Sprite Class in LibGDX
I am currently pursuing game development as a hobby, and have run into what seems to be a conflict in my mind regarding how to properly (using best practices) extend the Sprite class in LibGDX (or for ...
1
vote
0answers
179 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):
// ...
-6
votes
2answers
139 views
Moving a sprite diagonal?
I wonder how I should increase and decrease the value of xPos and yPos to be able to move a sprite object diagonal and in different angles?
canvas.drawBitmap(image, xPos - (image.getWidth() / 2), ...
0
votes
2answers
76 views
LWJGL Game crashes on some other machines [closed]
I just tried running my game on a friend's laptop, but for some reason it crashes. The exported .jar runs fine on my machine, and some others too. I can see that is has something to do with the ...
4
votes
2answers
120 views
Inventory Grid Detection
I'm working on creating an inventory system for a game. The inventory system will use cells and 2D images to represent items, like Minecraft, Diablo, or WoW. I've hit a bit of a snag when trying to ...
0
votes
0answers
104 views
Removing image background color?
I have a sprite sheet (image) and I want to draw it on the screen.
image = sprite sheet image
x = player x position
y = player y position
width = player width
height = player height
public class ...
0
votes
1answer
82 views
Android activities, when to use them?
I'm getting back into programming my game and I can see that I've used activities for so many things. I only have one with a custom-view (my actual game), the others are activities with XML-views, ...
8
votes
2answers
429 views
Random Zelda-style map generation
Im trying to randomly generate a map of rooms connected by doors, and I've succeeded in generating one using this code:
public void generate(GameContainer gc) {
rooms = new ...
