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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4
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3answers
7k views

2D Tile-based Collision Detection

I've been planning an indie game project for a while now. I'll summarise it for you so I can get right to the question. It's done entirely using the latest version of XNA through Visual Studio. ...
1
vote
2answers
407 views

How to randomly create stars in the background?

My player flies around the screen in any direction he wants, and the camera follows him. There are stars in the background. I can't figure out how to randomly generate the stars. I made a star ...
3
votes
2answers
815 views

2D Animation Smoothness - Delta time vs. Kinematics

I'm animating a sprite in 2D with key frames of rotation and xy-positions. I've recently had a discussion with someone saying that when the device (happens to be an iPad using cocos2D) hits a ...
4
votes
2answers
565 views

Detecting collision on a grid with a fast-moving object

I am working in a 2D collision system where I need to detect a collision of a rectangle on a grid, but since the rectangle may be fast enough to jump more than one of the grid squares (sometimes ...
-1
votes
0answers
67 views

ball 2d animation [duplicate]

Possible Duplicate: canvas ball physics animation I want to animate ball in html canvas like this. ctx.beginPath(); ctx.arc(75, 75, 10, 0, Math.PI*2, true); ctx.closePath(); ctx.fill(); ...
4
votes
2answers
1k views

canvas ball physics animation

I want to animate ball in html canvas like this. ctx.beginPath(); ctx.arc(75, 75, 10, 0, Math.PI*2, true); ctx.closePath(); ctx.fill(); start position is left top corner and ball's maximum ...
0
votes
1answer
2k views

Texture displays on Android emulator but not on device

I have written a simple UI which takes an image (256x256) and maps it to a rectangle. This works perfectly on the emulator however on the phone the texture does not show, I see only a white ...
0
votes
1answer
1k views

How to implement HUD

I'm wondering how one could implement an HUD in LWJGL. I've seen tutorials on this, but they don't seem to work. I know the basic structure goes like this: init3d(); // 3d code init2d(); // HUD To ...
7
votes
2answers
1k views

HLSL - Creating Shadows in 2D

The way that I create shadows is by the following technique: http://www.catalinzima.com/2010/07/my-technique-for-the-shader-based-dynamic-2d-shadows/ But I have questions to HLSL. The way that I ...
0
votes
2answers
444 views

Is there a problem with using a 2D square grid for your world map?

I'm making a game with a 2D square grid for my world map. It wraps around, so when you reach all the way north you start out in the south again, and when you go all the way east you wind up in the ...
1
vote
1answer
812 views

How can I add a parallax effect into my side-scrolling game? [duplicate]

How can I add a parallax effect into my side-scrolling game? I read a lot about parallax scrolling so I know what the logic is and what parallax is but I can't create a dynamic parallax effect. I ...
7
votes
2answers
182 views

How do I check to see if a tile corner is visible in 2d space?

I am trying to implement fog of war, and I have run into trouble. I want to check to see if the player is able to see the corners of each tile within a certain radius, however I am unsure how to check ...
1
vote
3answers
375 views

2D Physics in a networked game (iOS)?

I am researching the possibilities for a new iOS game. It's going to be a run-n-gun type platformer, and I'm looking into the possibility of co-op multiplayer. The game itself wouldn't be very ...
16
votes
3answers
2k views

How can I generate random lakes and rivers in my game?

I have a 2D block building game and am trying to make randomly generated lakes and rivers. I have looked into the Perlin noise algorithm, but, I couldn't get it to generate random and nice results. I ...
4
votes
1answer
2k views

Collision with tile corners/seams in 2D platformer

There seems to be a lot of somewhat related questions answered already, but none I read answered my exact problem. I have a 2D platformer whose world is made entirely out of tiles that are in a ...
6
votes
2answers
4k views

C# Perlin noise - generating “endless” terrain chunks?

I'm currently writing a little side scroller in C#, to both learn C# and have fun. Right now I have a simple random number generator generating the world but it isn't exactly all that great - so with ...
1
vote
1answer
558 views

repeating 2D world

I have a 2D world of 50*50meters and a viewport of 15*10meters. Current situation: if(player.x>World.WORLD_WIDTH){ player.x = 0; } if(player.x<0){ player.x = World.WORLD_WIDTH; } ...
5
votes
2answers
671 views

Alternatives to multiple sprite batches for achieving 2D particle system depth

In my 2D XNA game, I render all my sprites with a single sprite batch using SpriteSortMode.BackToFront and BlendState.AlphaBlend. I'm adding a particle system based on the App Hub particles sample. ...
3
votes
3answers
651 views

How to position a sprite in a 2D animation skeleton?

Given two joints that define a bone, I would like to know how to decide where, between those two joints, I should draw the sprite. This should be a fairly simple thing to solve, but there is one thing ...
-1
votes
1answer
700 views

Scrolling and Parallax scrolling in 2D game

I'm developing a 2D side-scrolling game.I have a scrollable bitmap for background with size 2400x480.How can i scroll this bitmap?I have searched for algorithms but i can't find any solution. I know ...
0
votes
1answer
156 views

Accelerate a Bullet on The Right Direction

I'm creating a simple asteroids 2D game with XNA so I can learn more on game development, I've started by reading this tutorial and, with my previous knowledge from developing Windows Phone ...
5
votes
2answers
4k views

Normal Mapping for 3D-Like Lighting in 2D Games

I recently saw this video about a game engine that uses normal mapping to generate lighting and shadows for amazing, 3d-like lighting effects. (Like the three barrels below on the right side, they ...
0
votes
2answers
1k views

Timer for pop up text in XNA

I am making an xna game which contains turn-based RPG battle elements. Any good game that features turn-based battle has to have a good feedback to the user. For example, When my guy attacks, there ...
4
votes
2answers
725 views

Cropping a line (laser beam) in XNA

I have a laser sprite that I wish to crop. I want to crop it so when it collides with an item, I can calculate the distance between the starting point, and the ending point, and only draw that. This ...
0
votes
1answer
849 views

How to make a 2D Terrain with opengl?

I want to make a simple 2d terrain with just a few bumps and height changes: I thought about just using random numbers to describe the height of a certain vertex, but I don't see how I can make ...
1
vote
1answer
591 views

How do I deploy my JavaScript/HTML 5 to desktop and smartphone?

I'm looking for framework that will let me code on JS for HTML5 canvas and then will let me deploy to desktop and Android. I'm not looking to learn new stuff like Haxe or Lua. I want to do it in plain ...
2
votes
1answer
493 views

Odd offset bug in Farseer/XNA/C#

So I'm using Farseer to create an immovable object: [...] private Body body; public Immovable(World world, ContentManager c, String s, int posx, int posy, int w, int h, String user_data) { ...
7
votes
1answer
2k views

Turn-based JRPG battle system architecture resources

The past months I've been busy programming a 2D JRPG (Japanese-style RPG) in C++ using the SDL library. The exploration mode is more or less done. Now I'm tackling the battle mode. I have been unable ...
3
votes
2answers
424 views

Collisions between moving ball and polygons

I know this is a very typical problem and that there area a lot of similar questions, but I have been looking for a while and I have not found anything that fits what I want. I am developing a 2D ...
0
votes
4answers
987 views

How powerful is modern hardware for complex, intensive 2D graphics?

I am embarking on a massive (image quality, file size, high frame count) project. I am still working on the basic engine, but have a big question that I would like answered before I begin testing. (It ...
5
votes
1answer
794 views

Infinite 2D Terrain

I was wondering how to create infinite 2D platform terrain. I've read about perlin noise and I have an idea I'd like to illustrate below. However, I have no idea how to achieve this. Are there any ...
1
vote
0answers
285 views

Need help with objects moving toward the player

I am making a 2D game with simple "gravity": everything is just pulled toward 0,0. The speed at which they accelerate towards it is GravityAcceleration up to MaxGSpeed. I also want the player to be ...
2
votes
1answer
799 views

Light mask map and camera for static lights in XNA Platformer

Using the example for some basic light maps found here : http://blog.josack.com/2011/07/xna-2d-dynamic-lighting.html, I've managed to create a lightmap texture using individual lightmaps and display ...
3
votes
2answers
823 views

2D sprites not drawing at correct depths?

I've been having some problems with getting my sprites to draw in the correct order. Right now there are 2 types of objects: nodes and paths. I always want the nodes to draw over the paths so I have ...
2
votes
1answer
458 views

XNA: Good way to queue up animations

I'm writing an AnimatedSprite class that has an Animation object (which itself contains a sprite sheet). The AnimatedSprite plays certain animations during key input. My problem is that how do I ...
3
votes
2answers
2k views

XNA: Draw Bounding Box around Sprite

I'm just starting with XNA and I wanted to draw Debug Lines around my Texture/Sprite to help me. Is there an easy way to do it with SpriteBatch? I haven't used the GraphicsDevice yet to draw.... ...
1
vote
1answer
345 views

What should my map creation workflow be for a turn-based tactics game?

I am planning to make a tile turn-based game like Final Fantasy Tactics. Now, I am brainstorming of how can I implements the map arena system (the battle arena where there are block by block tile so ...
0
votes
1answer
2k views

How to make a top down shooter? [closed]

I want to know is with XNA 4.0 (and C#) How do I exactly make a top down shooter? I have been looking for ages, but have been unable to find out how. If someone could tell me how to get started with ...
0
votes
1answer
601 views

Google maps layer for strategic game

I found one web site http://e-sim.org/googleMap.html which is similar to my game idea. But I have no experience on game maps developing. Can anyone share ideas how to make similar functionality like ...
0
votes
1answer
225 views

Change of direction after Collision

I am having a pickup image which is moving at random direction and have to change the direction after collision with some tiles, which are a rectangle. I've my own algorithm for detecting the ...
2
votes
1answer
681 views

Problems with moving 2D circle/box collision detection

This is my first game ever and I'm a newbie in computer physics. I've got this code for the collision detection and it works fine for BOTTOM and TOP collision.It miss the collision detection with the ...
0
votes
3answers
544 views

Optimizing updating thousands of enemies? (Or break up the enemies that need updated?)

Thanks in advance for wanting to help. I have an array of (right now) ~1000 enemies that I need to update every frame. The issue, I believe, is mainly brute-force checks. I've profiled my ...
1
vote
2answers
1k views

Provide A Scrolling “Camera” View Over A 2D Game Map

I'm in the process of attempting to create a 2D MMO type game with Kryonet and some basic sprites, mostly for my own learning. I have the back end set up great (By my standards) and I'm moving on to ...
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votes
1answer
430 views

How to remaster a retro game's graphics?

I want to remake an old game, which graphics is pretty old (1980s game), and I want to make a "HD version" of it. Of course, the game will have an "old graphics" setting, but I want to remaster the ...
2
votes
1answer
348 views

Most efficient way to implement walls and shadows in 2d

I am making a 2d top-down programming game similar to robocode. There will be up to 1000 walls (lines) in the arena, and up to 50 robots. Each robot can see in a 90 degree arc, and cannot see through ...
13
votes
1answer
2k views

How are “2.5D” art assets created?

By "2.5D" I mean the art style in games such as Roller Coaster Tycoon, Age of Empires 2 or Fallout 1 and 2: Everything in the games appears to be created with a "pixel art"-like tool. Am I correct? ...
2
votes
1answer
272 views

What broad-phase collision algorithms are suited to a static tiled world with dynamic objects of different sizes?

Sorry for this routine question, but I can't think of what broad-phase collision algorithms really work in the following, reasonably standard, setup: 2D tile based world, consisting of objects that ...
1
vote
2answers
1k views

2D Particle Explosion

I'm developing a 2D action game, and in said game I've given my primary character an ability he can use to throw a fireball. I'm trying to design an effect so that when said fireball collides (be it ...
2
votes
1answer
485 views

Pixel Collision - Detecting corners

How would I go about detecting the corners of a texture when I use pixel collision detection? I read about corner collision with rectangles, but I am unsure how to adapt it to my situation. Right now ...
2
votes
4answers
1k views

What should I use (controls, methods) to make a 2D tile based map editor?

I'm making a 2d game where each tile is a square and it's viewed at straight angle, no skewing, no rotation, it's pretty simple. Two weeks ago I tried using DataGridView, but as the number of rows ...