# Questions tagged [collision]

In collision detection problems, the challenge is to determine when shapes intersect each other.

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### Platformer with collisions

Today I started to build my first platformer, first time working with collisions and stuff. Now, surprisingly, everything seems to work, but since this is my first time creating a platformer and I'm ...
44 views

### Check for collision with side of screen

I thought of a program where you move a square with the arrow keys. I created it and asked a question about it on Stack Overflow. I copied the last code block of the accepted answer and tried to ...
8k views

### Line segment to circle collision algorithm

I've written a function (in Python 3) which computes if a line segment (constraint) and a circle (body) collide, and returns the point of intersection (closest point to the centre of the circle): <...
80 views

### FPS efficiency for 'attack counter'

I have a code snippet which I wish to improve to increase my program's FPS, but as a beginner in JavaScript, I do not know how. I know the problem, which is the fact my counter mechanism used to delay ...
800 views

### Quad Tree and Collision Detection Implementation

I have an implementation of a quad tree and abstract collision detection classes. The code works but looks very ugly, but I don't know what I could change to make it better. The reason I used two ...
59 views

### Calculating all combinations to make sure a Random algorithm has done them all

I have done this, but it's pretty ugly and it feels like I may be missing something to shorten it: ...
315 views

### 2D Platformer Collision Detection/Resolution

I am working on a 2D tile based platformer and was hoping to get someone to review my collision detection. I've only included the X collision check since the Y is essentially the same. Any suggestions/...
322 views

This checks the intersection between a Ray and a Plane and between a Ray and a ...
137 views

### Weeding out triangles for triangle-triangle collision detection using a spatial hash

I am implementing a multi-phase collision detection system whose final collision check is checking the triangles of one shape against those of another. As the number of triangle-triangle comparisons ...
5k views

### Collision-detection for an SDL game

I am working on a simple SDL game in C++. I want to make my collision detection implementation better. Here's the complete project: ...
1k views

### Thread, handler and activity structure for a bouncing ball animation

This is a custom MyActivity class with two custom views (bar and a ball): ...
4k views

### Bouncing stacking boxes

I'm not sure if it would be better to make the envelope into an extension of the Rectangle constructor. The physics seem a bit dodgy, it works well most of the time, but sometimes the boxes overlap ...
2k views

### 2D tilemap collision method

Is this the optimal method to check for collisions in a 2d-based game? I put together a working demo of 2D collisions here (WSAD to move, orange blocks collide). I currently use the following code ...
828 views

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1k views

### A Quadtree implementation with Colliders

I have created a QuadTree in Java and would like a general code review or suggestions. ...
333 views

### Finding the nearest polygon

Finding the nearest polygon out of a list of polygons seems to be quite a challenge on performance, due to lack of optimization. Consider the following image: I'll give the concept behind this. The "...
2k views

### Optimizing snap SVG animation with collision detection

I have a snap SVG animation which animates a bunch of circles, and draws a line between them if they are within a certain proximity of each other. However, I realize that there is a lot of optimizing ...
1k views

### Slow foreach loop to check for intersect

I'm trying to make a loop where it returns whether or not a rectangle collides and then to which coords the rectangle should move to. I'm calling my function like this: ...
139 views

### Orginizing/Optimising my collision detection setup

I'm creating a 2D tile based platformer with AABB (Axis aligned bounding boxes), and it works, I just want to organize and optimize my setup. Here are methods in my player class and entity class that ...
3k views

### Pong Game in WinForms

I've wanted to make a Pong game for awhile, so I eventually got around to it now, it didn't take that long except for the reflections which I unfortunately didn't end up being satisfied with. I wanted ...
2k views

### Implementation of SAT (Separating axis theorem)

A project I was working on required the usage of the Separating Axis Theorem to detect collisions between two convex polygons in real time. So I implemented a basic class (...
2k views

### Ping-pong game with JavaScript and Canvas

I have created my first ping-pong game with JavaScript and Canvas. I will be glad if anybody can tell me how to optimize the code and functionality. https://github.com/nikitalarionov/js-pong First ...
818 views

### Design of physics with Collision Detection using SFML

I found out that in Visual Studio 2012, it is possible to create project of SFML easily with a template. I am not an experienced C# programmer. Hence I wanted to implement a physics component just for ...
14k views

### Detecting collision of two divs

I have two divs as seen in this JSFiddle. To recreate the problem, keep clicking on the Gray container till both divisions touch each other. The purpose is to ...
1k views

### Performance of collision detection in a grid

I have fairly simple collision checking and handling Python code which is currently bottlenecking my performance quite a bit. I haven't done too much coding in python and I'm quite sure there's ...
38k views

### Overlapping rectangles

I received the following question in a technical interview today (for a devops/SRE position): Write a function which returns true if the two rectangles passed to it as arguments would overlap if ...
171 views

### Unit tests for collisions

I'm finding it a bit tedious to write unit tests for my collision class because there are so many variations of collisions that need testing. I see repetition in the set-up and assertion stages of ...
113 views

### Checking whether two strokes overlap [closed]

I have these two functions and I was just wondering if there is any way to shorten the line of code with the many && statements. Shortening of the rest of the code would be cool too, but it's ...
1k views

### Java Pong Game Collision between bat and ball

I have a very simple Pong game that I've built in Java. The code is quite long so I've decided to focus this question on the collision that occurs with the ball and the bat and also the effects in the ...
209 views

### Collision system in Pong-like game

I am writing a game like Pong. Therefore I am using an entity system approach, so I use a Component-based design. The hardest part until now was to write the collision system. As I just began with ...
192 views

### Collision detection accuracy

How do you guys think I can improve the code for collision detection on my website asteroidfield.eu5.org? The current code is ...
208 views

### Second attempt at canvas spatial grid collision

After posting my first question and my first attempt which you can see here: Canvas spatial grid collision I have re-written it to try and implement what the person gave as an answer. I didn't do ...
398 views

### Canvas spatial grid collision

You can see a working example here. Be sure to click on the canvas or the key inputs will not be detected! Are there any ways I could improve upon this? Anything that should have been done ...
244 views

### Breakout-like game in JS

I've made a small breakout game, so far with one level. My plan is to expand it so that it has a level editor, but for now I wanted to make sure that everything is currently looking well-designed. I ...
174 views

I have an implementation of a BrickBreaker-like game where instead of pieces being just removed from the ceiling, each impact results in a new ball being released, gradually building up to a pretty ...
499 views

### Collision-checking optimizations

If I'm working in a 2D environment and have hundreds of objects, brute force collision-checking would be out of the question, but would my method below work? For example, let's say I have a ...
347 views

### Artifact collision in plane module

Here's something I tried putting together as I'm learning. Critiques on anything are welcome. There's also a logic bug in the Plane module I can't identify. The long and the short are that it takes ...
6k views

### Java Slick 2D Collision Detection Methodology

I have a collision detection for terrain setup (non-terrain is handled with a quadtree I implemented apart from this) and I was wondering how others have done it compared to mine and what I could ...
177 views

### Does this intersection algorithm work like it's supposed to? [closed]

and can I make it more efficient? It's to test the collision between a ray and a sphere. ...
303 views

### Collision detection inconsistencies [closed]

I've been wondering about simple collision in C++ for a while now, and I've tried to make up my own code. The code posted below works when walls are placed in a perfect rectangle around the player. ...