2D games are drawn in a two-dimensional space using two-dimensional objects. To represent its position, each game object will have an `x` and a `y` coordinate.

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-2
votes
2answers
139 views

Drawing background is very costly/slow [closed]

I'm creating a "simple" Tetris style game for a beginner project. My problem is when I added the background (tiled look consisting of a bunch of squares), the game got very slow. It has to have ...
1
vote
0answers
469 views

Stacking Drawing Matrix for SpriteBatch in XNA

I'm trying to make a 2D engine for XNA with SpriteBatch. My object unit is Entity, which can include other Entities as its children. However, when drawing them, the rotation and scaling stacking do ...
5
votes
1answer
2k views

2D Line drawing with Pixel Shaders

Recently I asked a question, what is the fastest way to render 2D lines using DirectX, and one of the answers mentioned this paper on Fast Prefiltered Lines which uses Pixel Shaders to accomplish ...
2
votes
2answers
893 views

Background blur in 2D game?

In an XNA 2D game, I am thinking about blurring the background slightly to increase the feeling of depth? I am already using parallax scrolling which works pretty well in terms of enhancing depth ...
5
votes
1answer
3k views

More efficient way to implement Line of sight on a 2d grid with ray casting?

Consider a 2d grid of tiles, and an approximated sphere of coordinates - centered on the player - that represents line of sight. The goal is to block the line of sight beyond obstacles (ie walls). ...
0
votes
1answer
122 views

Find the footprint of an isometric entity

I'm working on making a 2D isometric engine in Java. I'm getting into collision detection and I've hit a bit of a problem. Characters in-game are not restricted to movement from tile to tile - they ...
4
votes
2answers
2k views

Simulating “line of sight” with obstacles on 2d grid?

Ran into an interesting problem. I need to figure out how to simulate line of sight - simple enough, just on a 2d grid with obstacles. Either a grid cell is visible, or it's not. I can get something ...
1
vote
1answer
220 views

SimpleOpenNI: Check if user hand is in specific area on image

Concerning our Microsoft Kinect project, we need some help. We control a robot with our movements tracked by the Kinect sensor. We display the depth image of the Kinect sensor on our screen, so we ...
3
votes
1answer
71 views

Retrieve outer most points on a 2d graph

G'day everyone, I have a 2d graph which has some points plotted on it. What I need to do is get only the outer most points so that I can connect them up (isn't really relevant). What I can't seem ...
1
vote
1answer
502 views

Tongue pull effect

I've been searching on the net for several days and can not find nothing about this effect. Even a name for this effect. I want to make a character that can use his tongue to pull objects objects it ...
0
votes
6answers
1k views

Can I develop a game on PC in Java and move it to Android?

I have fairly good experience with Java, but new to Android development. I would like to develop a 2D game which would have animations and online play. Can I initially develop this game on my pc ...
0
votes
1answer
106 views

Computing orbit direction depending on angle of approach

I'm trying to develop a simple 2D space game with no friction using corona-sdk. In the game, I have several planets which all applies forces to the player according to Newton's law of universal ...
0
votes
1answer
158 views

Separating Axis Theorem fails at certain angles

I'm currently attempting to add an overlap tester for an axis aligned and orientated bounding box but the solution only seems to work accurately when the OBB's angle is between -10 and +10. As the ...
4
votes
5answers
477 views

How to implement rotating Earth effect in 2D?

I've modeled a photorealistic scene of the Earth rotating in 3DS Max and would like to use it as a backdrop of a menu screen in a 2D game. What would be the appropriate way to implement this effect ...
1
vote
2answers
303 views

Basic plane kinematics

I never did physics in my life and this is really hard for me. I am currently trying to implement movement in the X and Y axis of a plane, in a video game I am making. What I want to do is, given a ...
4
votes
1answer
176 views

What is the appropriate way to implement collision in 2D worlds?

If I want to create a 2D game map which features areas traversable by a player through standard up/down/left/right inputs, and then have areas that are NOT traversable... perhaps just a bush, or a ...
1
vote
0answers
118 views

2D Java Networked Game Coordinate Updating [closed]

I'm currently developing a networked 2D MMO-style game in which several thin clients (ran in an applet) are able to connect to a server and well, do MMO-style "things"! Some more background on the ...
1
vote
1answer
1k views

Architecture of “doodle jump” type gameplay infinite looping background

I am planning make a doodle jump type game, character jumping on platforms. A scrolling or doodle jump like background which ll appear to move when character moves upward and appear moving (just like ...
4
votes
2answers
950 views

XNA Why is Texture.GetData one dimensional?

This is question has been really killing me. In XNA when you want to convert an image to color data using Texture.GetData, it only lets you make it a one dimensional array instead of a 2D one. This ...
13
votes
5answers
1k views

What is a suitable input method to use for a 2D platformer on a touch device?

I am creating a 2d platformer game like Super Meat Boy in which precision of movement of my lead character matters. I am using libgdx. The keyboard controls on the PC work precisely, but when it comes ...
5
votes
3answers
202 views

Labeling Areas on a map

I've been wondering how you would go about labeling an area on a 2D tile map. What I'd like to do is associate tiles with an area i.e Forest Area, Desert Area, etc. Keep in mind this is an idea, so ...
-3
votes
1answer
280 views

Implementation of planets in top-down space shooter [closed]

I am working on a top-down space shooter, and I have come to the point where I need some input on a mechanic. I have implemented enough that I can make this choice; either way will not change the code ...
12
votes
3answers
5k views

Fastest way to render lines with AA, varying thickness in DirectX

So I'm doing some DirectX development, using SharpDX under .NET to be exact (but DirectX/C++ API solutions are applicable). I'm looking for the fastest way to render lines in an orthogonal projection ...
5
votes
1answer
831 views

How to draw a trapezoid in OpenGL?

The question seems easy, but you simply change vertex positions to match the corners of a trapezoid but it simply fails. I've tried scaling top and bottom edges like this : but when I apply my ...
4
votes
3answers
764 views

Boundaries in game development: How do “professionals” do it?

How do professionals do boundaries in a 2D game? The way I do is say I don't want the sprite to move into a certain area: //Example if ((playerPosX >= 825) && (playerPosX <= ...
0
votes
1answer
311 views

Iterating 1D array and getting 2D tile position

I know I'm missing something very obvious here, but I have a 1D array that contains integers.I have a map that is 30 x 30 and the center coordinate is 0,0 (This is actually 3D, but I'm essentially ...
3
votes
4answers
1k views

Efficient path-finding on 2D tile-based multilevel map

It's a question I've been thinking about for some time... How do you effiently find a path on a 2D tile-based multilevel map? The map I use, for example, is 2048 on 2048 tiles wide. It has 14 levels ...
0
votes
4answers
1k views

Storing huge 2D tiled map in a txt file

I'm working on a global startegy game that uses a 2D tiled map. The map is to be 8000x8000 tiles large (this size is fixed, the map stays the way it is throughout the game), since I'm covering a large ...
0
votes
1answer
321 views

2D graphics scaling

I've been wondering how to archive kind of zooming behavior with 2D graphics. I'm pretty sure that this is not right term, but let me try to explain my thoughts. Ok, let's start by defining that we ...
13
votes
2answers
4k views

Implementing a camera / viewport to a 2D game

What is the most practical way to implement camera/viewport to a 2D-game? I've read, that I should store the object world position instead of position relative to the screen? Current situation: I ...
1
vote
2answers
324 views

Simple Bounding Sphere Calculations for 2d game

I'm writing a 2d game and have a question regarding the use of bounding spheres. I'm kind of OK with the math, but I'm confused about one thing. To work out the distance between the 2 centre points ...
10
votes
0answers
910 views

How to create 2D shadows [duplicate]

I'd like to create lights and shadows in a 2D environment, like in the image below: I did several searches but got no results. Do you have any hint?
2
votes
2answers
245 views

What kind of projection is used here?

Tibia is a 2d game, but it's sprites are drawn using certain kind of orthographic projection that is not the same I'm used to: I'm trying to figure out what projection is used here. I've guessed ...
5
votes
1answer
226 views

Physics/Logic behind self-bounce

I have a game that I am currently working on and I have a problem. What would a ball look like when it makes itself bounce. Say, for example that the ball had its own "inner power", was made out of ...
4
votes
2answers
171 views

Why is my collision resolution failing on the corners?

I'm tearing my hair out trying to work out how to handle my collision resolution at the corners of the rectangles that I'm colliding with. The code that I'm working with is: class Player(object): ...
1
vote
3answers
822 views

Need Guidance Making HTML5 Canvas Game Engine

So I have some free time this winter break and want to build a simple 2d HTML5 canvas game engine. Mostly a physics engine that will dictate the way objects move and interact(collisions, etc). I made ...
3
votes
5answers
882 views

XNA 2D Spritesheet drawing rendering problem

I'm making a tile-based game, using one spritesheet containing all tile graphics. Each tile has a size of 32x32 pixels. The main problem is: when I draw the tile to the screen, if the tile position x ...
8
votes
1answer
342 views

Optimal sprite size for rotations

I am making a sprite based game, and I have a bunch of images that I get in a ridiculously large resolution and I scale them to the desired sprite size (for example 64x64 pixels) before converting ...
4
votes
2answers
221 views

Collisions on complex map 2D

I'm currently thinking about collision and map system that I want to use in my next game and I'm kind of puzzled. Maps are going to be somewhat complex with lots of irregularities and thus tiling is ...
7
votes
3answers
825 views

Isometric smooth fog

I'm working on a simple 2d game with direct3d 9. It's a isometric game with diamond tiles and a staggered map. This is what I have: As you see I have some kind of fog which is acomplished by having ...
2
votes
3answers
1k views

2d shapes in XNA 4.0?

Having some experience of XNA but none of 3D programming. I have an idea i want to realize but i have not decided to do it in 3d or 2d. Im not sure which one will be best in XNA. I want to have a ...
3
votes
4answers
308 views

Sprite and Physics components or sub-components?

I'm taking my first dive into creating a very simple entity framework. The key concepts (classes) are: Entity (has 0+ components, can return components by type) SpriteEntity (everything you need to ...
1
vote
0answers
150 views

How can I use iteration to lead targets?

In my 2D game, I have stationary AI turrets firing constant speed bullets at moving targets. So far I have used a quadratic solver technique to calculate where the turret should aim in advance of the ...
1
vote
2answers
736 views

Making a 2D game with responsive resolution

I am making a 2D game, however I wish for it to be resolution agnostic. My target resolution i.e. where things look as intended is 1600 x 900. My ideas are: Make the HUD stay fixed to the sides no ...
1
vote
2answers
297 views

How do I cap rendering of tiles in a 2D game with SDL?

I have some boilerplate code working, I basically have a tile based map composed of just 3 colors, and some walls and render with SDL. The tiles are in a bmp file, but each tile inside it corresponds ...
0
votes
3answers
3k views

Scale a normalized 2D vector always to the same length

For any normalized 2D vector, except for ( 0, 0 ), how would I scale the vector to always be the same length? For example: int length = 10; vector v = vector( 0.1, 0.5 ); vector v2 = vector( 0.3, ...
5
votes
1answer
428 views

Performance of pixel shaders vs. SpriteBatch: XNA

Precondition: I read this question/answer about using shaders, or spritebatch, to render and mark a sprite. I need to do something like that. I also have a 2D lighting PoC which I need to write. The ...
-3
votes
1answer
366 views

Character jump animation is not working when I hit the space bar [closed]

I am having an issue with my game in XNA. My jump sprite sheet for my character does not trigger when I hit the space bar. I can't seem to find the problem. I have also include the code below to make ...
-1
votes
1answer
271 views

How to create GoogleMaps-like camera for simple 2D strategy game? [closed]

I am just starting in game development (with web programming background). I want to know how to create 2D game with camera that can zoom in/out and can be moved like map in Google Maps. Could you help ...
2
votes
4answers
617 views

Is there an isometric 2d game that doesn't use tilemapping? [closed]

Is there an isometric 2d game that doesn't use tilemapping? I want to do this in tilemap but the client doesn't want to use it (since it's easier to design maps without using tiles). I've tried to ...