3
votes
2answers
455 views

How can I tell what a rectangle intersects with?

I understand XNA's Rectangle class is rather limited, but surely there is a way to tell what a Rectangle is intersecting with? If I had Rectangle boundingBox = new Rectangle(stuff here); how would I ...
0
votes
1answer
76 views

2D Rectangle Collision

I want to make a small 2D game. In the game you can go in all directions(with the bird's-eye view) and can shoot. (A little bit like BoxHead http://de.y8.com/games/box_head_2play) My problem there is ...
3
votes
3answers
116 views

Using uniform grids for collision detection - Efficient way to keep track of what a cell contains

I was looking for an efficient way to implement collision detection in a 2D game. A way that won't result in an O(n^2) level of complexity. A lot of people recommend to use Uniform Grids for this ...
1
vote
0answers
55 views

how to project a collision between a pair of polygons under rotation?

I am trying to create a physically plausible 2d physics engine. I have read many documents about detection of collisions, contact resolving, interpenetrations, projection, separating axis theorem ...
0
votes
1answer
205 views

Platformer raycast collision detection

I'm using Unity to create a 2D platformer. For collision detection, I'm using raycasting to detect any possible collisions with specific collision layers, and adjusting the desired delta x & y ...
0
votes
0answers
81 views

Polygon Collision Response

I'm working on a game engine that has a built in custom physics engine (I know it's a waste of time, but I have years to make this, so why not make it good?). Currently, with any number of polygons, ...
1
vote
1answer
146 views

Strange collision behaviour in 2D game even though the collision is very basic [closed]

I have a player ship (cube) and some enemy laser projectiles. When the player ship has position X values greater than 1, collision with the enemy projectiles occur but when it has lower X values, the ...
-1
votes
1answer
71 views

Grid based Collision Detection between circles [duplicate]

I am working on a 2d arcade game where I have 5 types of circles with different sizes: The ship, the missiles, and 3 types of monsters. This is what it looks like: Currently I'm using brute force ...
0
votes
0answers
231 views

Slope polygon collider 2D causing box collider 2D to 'bump' while sliding on it

I'm doing procedural terrain generation. So far I've created the mesh, and attached a 2D polygon collider to it. The terrain is made up of hills going up and down. After doing so, I put a 2D rigid ...
0
votes
0answers
66 views

Collision - Per Pixel and Rectangle Based, Combined

UPDATE:i found the error in my calculation the problem was that i needed to consider if the image is rendered flip or not to fix it just need to rub from the opposite side of the sprite I am currently ...
0
votes
1answer
205 views

How to implement uniform grids

Up until now, I implemented all-against-all collision detection in my games. It worked fine. But I reached a point where implementing this kind of collision detection, makes the game run poorly, ...
1
vote
1answer
156 views

AABB vs Rectangle

I'm trying to wrap my head around 2D physics and stumbled upon Axis Aligned Bounding Boxes, and I have a couple of questions regarding them. In all AABB structs I could find out there, people prefer ...
0
votes
1answer
94 views

Map color collision problem

Hello i'm doing a game in WPF, 2D version (top view) I have the map and i'm trying to check for color collision in pixel each time the timer is activated Well...with 1 object it works fine but with ...
0
votes
1answer
149 views

Circle-Rectangle collision velocity adjustment

I created my circle vs. rectangle method based on this algorithm: http://stackoverflow.com/questions/401847/circle-rectangle-collision-detection-intersection Currently, I have a dynamic ball with ...
0
votes
1answer
228 views

Circle vs. Rect Collision accuracy problem

The blue ball is dynamic and is supposed to bounce off the walls, as well as the rectangle. Currently, the green rectangle is adding an invisible line to the scene, which doesn't let my ball go where ...
0
votes
1answer
111 views

Collision method for multiple circles

This is a bouncing ball program. There is 1 dynamic circle and 3 static ones. The static ones are obstacles for the dynamic circle, and the dynamic circle is supposed to bounce off of the static ...
2
votes
1answer
201 views

Circle to Circle collision - bad accuracy

Circle1 (blue) is moving and its X and Y bounds are the screen (meaning it bounces off the walls). Circle2 (black) is stationary. Circle1(blue) is supposed to bounce off of Circle2 without ...
0
votes
1answer
224 views

Bounce off of objects

How do I make my ball bounce off objects on the screen? I'm having trouble detecting the collision, as well as calculating the response. The picture below is a good example of how the program should ...
2
votes
0answers
115 views

What would be a good way to implement Zelda like attack? [closed]

I'm looking for ways to implement "attack" like Gameboy Zelda used. A method I came up with is: Create a rectangle near a player based on the direction the player is facing when every time attack ...
1
vote
1answer
429 views

2D Rectangle/Circle Continuous Collision Detection

I'm looking for a fast 2D continuous collision detection algorithm for circles and rotated rects. It needs to determine the time of collision. Both shapes may be moving at high speed, so the ...
1
vote
1answer
202 views

2D fighting bounding boxes

I'm prototyping a 2D platformer/brawler game for uni and I'm having some trouble with creating collision/bounding boxes. This is most likely going to end up on a Vita so I do have some library ...
2
votes
2answers
226 views

Would it be more efficient to handle 2D collision detection with polygons, rather than both squares/polygons?

I'm working on a 2D game engine and I'm trying to get collision detection as efficient as possible. One thing I've noted is that I have a Rectangle Collision collider, a Shape (polygon) collider and a ...
9
votes
2answers
267 views

Falling Blocks and complex shapes

I currently have a simple Tetris-like game and have come across a problem I cannot solve. Unlike Tetris where there is a single falling shape, I have multiple, potentially interlocking shapes that ...
4
votes
2answers
282 views

Allowing a player to walk up and down slopes without resistance

I am trying to implement a platformer where both the player and the level are made up of arbitary polygons. One requirement is that the player can stand still on slopes, and walk up and down them ...
0
votes
0answers
189 views

Finding a normal vector

I'm trying to replace my old integer based movement and collision system with a vector system, because its more precise and more flexible. I want to implement wall sliding, such that if a player hits ...
0
votes
2answers
89 views

How to cancel out simultaneous collisions in libGosu?

I am working on an Asteroids remake. When the player's bullets hit a large meteor, it should break apart into 2 smaller meteors. This works when the player is only firing one bullet, but when the ...
4
votes
1answer
204 views

Collision Detection problems for vertically moving platforms

Background My game is a static screen (ie, no scrolling) 2d platformer and my CD routine is split into 2 - after vertical movements, (ie, gravity etc) I check for collisions, and if they are ...
0
votes
1answer
236 views

C# XNA4 2D Collision Detection

I am working on a 2D engine in Xna and am running in a bit of trouble with Collision implementation. What I want to do is have an interface ICollidable that I can add to GameObjects that are ...
0
votes
1answer
110 views

simple collision detection 2d match 3 gem over gem

im building simple match 3 game . now i have the parts where i move the gems with the mouse only in the straight X or straight Y up and down and both sides , no 45 degrees movements on grid . now im ...
1
vote
2answers
425 views

How would I detect if two 2D arrays of any shape collided?

Say there's two or more moveable objects of any shape in 2D plane, each object has its own 2D boolean array to act as a bounds box which can range from 10 to 100 pixels, the program then reads each ...
1
vote
1answer
188 views

Collision detection with entities/AI

I'm making my first game in Java, a top down 2D RPG. I've handled basic collision detection, rendering and have added an NPC, but I'm stuck on how to handle interaction between the player and the NPC. ...
-2
votes
1answer
141 views

Collision detection-too fast [closed]

I've looked through a few other answers and it seems like I'm doing a dynamic timestep update and I'm checking about 10 pixels before the rectangle to see if it would intersect. However, the updating ...
0
votes
1answer
107 views

How to handle zooming? (Collision detection and speed are off)

I'm working on a bird's eye view 2D game. I want to zoom in/out based on the entity's speed (similar to GTA 1/2), but I'm struggling with the zooming. To zoom, I simply scale all the entities by the ...
0
votes
1answer
2k views

How do I make a game tick method?

I've seen in some other simple 2D games that a "tick" method is used to sync game logic and graphics rendering. My main reason for using this is due to my collision detection malfunctioning, since ...
1
vote
0answers
126 views

scale rotating boundingbox

I want to use basic rectangular collision detection. I have a rotating sprite and a method that calculates the bounding box every time in the Update() method. I simply check for intersection between ...
3
votes
1answer
106 views

Player getting caught on floor

My player is getting caught on something on the floor. My whole environment is just blocks. I have looked through (and tried to change) just about everything I can think of in my player update method. ...
0
votes
1answer
138 views

My logic in collision detection in diagonal code correct? [closed]

I made this code to detect collision from the diagonal(top left). I'm trying to find the problem on what I'm doing wrong. Is it necessary to have a diagonal collision for the wall? Player class: ...
-1
votes
1answer
357 views

How was traditional 2D collision detection/resolution being done? [closed]

Just out of pure curiosity, I'm wondering how classic 2D games of the 80s/90s (The Legend of Zelda, Super Mario, Warcraft, ...) approached collision detection/resolution. For some reason I can't ...
0
votes
0answers
58 views

Collision detection issue on 2D game engine with isometric game graphics [duplicate]

Let me first show you an example of issue so you'll see the problem. http://i.imgur.com/dTxJIN7.jpg The player object has red colored collision borders. Since I'm using an 2D engine, his head ...
-1
votes
1answer
125 views

Breakout style ball-paddle bounce, error at corner

I am trying to make a breakout game where you have a paddle and a ball bounces around breaking bricks. The problem is that if the ball touches the corner of player it goes inside of player. I change ...
1
vote
2answers
85 views

Mapping of positions on images in different frames

I am looking for a possibility to map different positions on a 2D Image which has different frames. Let's say I have an image, consisting of three frames, which shows a spaceship. The first frame ...
1
vote
1answer
143 views

Object Detection

I'm building a collision system for my 2D game, broadphasing (sweep and prone + pair detection) works. But I don't know how to separate pickup objects, tiles and the player from each other. My ...
2
votes
1answer
296 views

How to do 2D Raycasting on a slope

I have a 2d platformer game where my slope can be set at any angle, so I've setup a middle raycast that points to the ground onto the player to handle the collision. This works perfectly fine on a ...
3
votes
2answers
81 views

Sperating axis test glitch help

I'm working on a pretty basic 2d platformer and I'm wondering if I could get advice on an issue I've run into. To keep collision detection simple I'm using AABBs and separating axis tests for ...
3
votes
2answers
310 views

How Does Ultima 7 manage different floors in 2d

In U7, you can move among floors without the function "tranport" the player to another place, as for example the first ff ones. How can it tell whenever the character is moving from floor z to ...
1
vote
1answer
661 views

UML Class Diagrams for 2D platformer Games? [closed]

I have to develop a small arcade game in C++ for a college assignment using a 2D Game Engine my teacher coded. What would be the best way to make a UML class diagram for it? It's very basic stuff but ...
0
votes
1answer
106 views

How do I check for non tilted 2D rectangle collision?

I'm trying to find out how to check collision with different rectangles. Now the cubes I have have a x, y, height, and width to them. So it might look like this on the screen: And not like this: ...
1
vote
1answer
162 views

Application design for specific points on image

Hi guys I am starting a simple hobby app in Unity, its a 2D app, which have some alphabets like A,B,C..Z (images) . There ll be specific paths where user touch one by one to complete drawing the ...
1
vote
1answer
585 views

2D tile-based collisions: using different methods by tile?

I'm trying to write a collision handling method that handles each of the 9 potentially colliding tiles (the player's and the 8 around him) differently according to a "CollisionType" value attached to ...
1
vote
0answers
243 views

iOS cocos2d - sprite gets stuck in collision detection

I'm developing a top down game in cocos2d and I have collision code that checks collisions between enemies and the player so that they don't go through each other. The code seems to work but the ...