# Questions tagged [collision]

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

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### Object Collision in Breakout game using SDL library [closed]

Im trying to make a retro game of Breakout using an SDL library. Im still trying to learn developing and OOP. I got to the part where i want to check for collision between paddle and the ball, and ...
6 votes
3 answers
270 views

### Intersecting rectangles on a torus

Description Imagine a space like the arcade game Asteroids where everything wraps around right to left and bottom to top - effectively coordinates on a flat torus. The diagram shows an example of two ...
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5 votes
1 answer
364 views

### Simple Ellipse Collision Mini Game

I am doing an exercise to help me understand C#and OOP. The exercise is supposed to teach me about ...
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2 votes
1 answer
117 views

### A Spatial Hash View: Store references to spatial data so it can be used for performant broad phase collision detection

I have created a non-owning view of some spatial data that organises the data into cells. The data is split into a grid of cell size 100, and the key to the ...
• 373
2 votes
2 answers
310 views

### Movement and collision function

I just want this code optimized to the max and I don't mind knowing if the optimization is pretty much at the max already or if I am doing movement and collision wrong. My game is a 2d Minecraft style ...
• 179
2 votes
1 answer
287 views

### Simulation of sand particle collision

I am making a module that allows you to create sand and simulate it. I have successfully done this, but it runs very slowly. I need this to be able to simulate at least 1000 particles, at a fps higher ...
4 votes
2 answers
267 views

### Revised Top-Down Dungeon RPG

Introduction: So far, the game works well, and my only major concerns, are a bullet system (including a function where you click the mouse to shoot the bullets), and a collision system between the ...
• 123
5 votes
1 answer
184 views

### Convex polygon-polygon swept collision test

Currently working on a pre-solve collision library. My goal is to have it be potentially usable in potential video game projects of mine, so time constraint is small as this should be used in a game ...
• 61
9 votes
1 answer
871 views

### Generate unique random strings considering collisions

I'm coding a random strings generator. It's working, but I'm not sure if this is efficient. ...
• 191
5 votes
1 answer
2k views

### Python - 2D Elastic Collision Simulation

I am currently a Python beginner, who just finished a script simulating collisions between circles (balls) in 2 dimensions. I would appreciate comments on overall structure, variable names and really ...
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4 votes
1 answer
190 views

### A library of 2D Shapes with functions for their intersections

The goal was as much code reuse as I could get. Shooting for a pure-function-y style. Would love any feedback on general architecture, adherence to standard practice and usability - as well as ideas ...
• 185
11 votes
1 answer
441 views

### Battle City (Tank) replica

I'm learning JS and Canvas. A friend of mine gave me the task to create a Battle City replica. I've already managed to make the map and the player to move. Nothing fancy just some squares with a color,...
• 181
2 votes
1 answer
64 views

### Creating restrictions for a sprite's possible position on the screen

The great feedback I got on my first post on Code Review made me wary of code repetition. This code does what it is supposed to, which is to create restrictions for a sprite's possible position on the ...
• 149
2 votes
0 answers
210 views

### Typescript QuadTree

everybody. It took a tree of squares for my web game. I wrote a preview using Typescript. I would like to hear from you tips on how to improve the code (I just started writing in Typescript). First ...
16 votes
3 answers
6k views

### 2D Collision Detection in C++

I'm attempting to rewrite the classic snake game in c++. What I am inquiring about is my implementation for a 2D collision detection function. I am utilizing ...
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4 votes
1 answer
149 views

### Creating a maze game where the game resets if you hit traps/walls and finishes when you hit a different color

Here’s my code, the traps are the slightly visible squares. The user controls a red square (with arrow keys) and cannot touch the walls or traps or else the game resets. Additionally, if the user ...
• 41
3 votes
1 answer
175 views

### Making a grid for collision detection in a game that wraps

I'm making a 2D game which wraps (when you move off the right edge, you appear on the left, etc). The game area is square, all objects are circles (with AABB smaller than the game area, and in most ...
• 227
4 votes
1 answer
1k views

### Bounding volume hierarchy C++

Here is a C++ implementation of a bounding volume hierarchy, aimed for fast collision detection (view frustum, rays, other bounding volumes). It is based on the ideas from the book "Real-Time ...
1 vote
2 answers
225 views

### Simplify JavaScript collision detection with offset [closed]

I am working on a background project that is a little interactive. Now I am using some collision detection to draw some lines and stuff. The code I have works great but it is very bulky and hard to ...
0 votes
1 answer
76 views

### Self Updtating QuadTree

I'm making a simple 2D game engine, and to make collision detection more effective I tried making a QuadTree class. I don't know if this will work, but that's not that important. You don't have to ...
2 votes
1 answer
572 views

### C++ Breakout game using SDL

I did a big mistake to create procedural C++ breakout game on start and now im having trouble converting it into OOP. As far as I can see I need classes: Loptica (eng. Ball), Splav (eng. Paddle), ...
3 votes
1 answer
258 views

### Flood Fill using unordered_map which has user-defined type as key

I have an implementation of the flood fill algorithm. Assume that an image is provided as a vector of ...
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5 votes
2 answers
10k views

### Python Turtle based Pong game

I'm new to Python but I've coded in other languages mainly for hardware. I made Pong in Python using turtle but it's a little glitchy. I was wondering if any of you guys could check it out and give ...
5 votes
1 answer
716 views

### Collision detection for moving 2D objects

After implementing SAT (separating axis theorem) and not being happy with it only working on stationary shapes, this in theory allowing for fast objects to glitch through others, I came up with this ...
3 votes
2 answers
300 views

### Platformer Game: Arrow Key Player Movement and Collision Detection

I am in the middle of working on this game and I still need to add some things (e.g. score, coin counters, etc.) but I really feel like there is way too much unneeded code. Could you help me simplify ...
5 votes
1 answer
291 views

### Line and bitmap collision detection

I am trying to implement an efficient collision detection between a line joining two points and a bitmap mask. Example: Currently I am using Bresenham's line drawing algorithm to draw each pixel of ...
• 153
6 votes
2 answers
950 views

### Collision Detection in a 2D shooter game

I have the following code that works just fine for collision detection. The only problem is its size and its performance. I'm trying to do it and many other things 60 times per second, which doesn't ...
• 197
5 votes
1 answer
49 views

### Mutable 2d Rect class

So I wrote a 2d rectangle class for use in a 2d pygame based game engine. It uses the vector class from this question, so if you want to test, you need that code too. I want to ask: Does this ...
• 413
6 votes
3 answers
244 views

### Calculate next position and velocity after "bounce"

Intro and code I have the following function that calculates an object's "next" position and velocity (in 1 dimension) given a boundary [0, max]. ...
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5 votes
2 answers
448 views

### OBBs intersection improvement for AABBs-OBBs

I'm trying to code some intersection codes for Oriented Bounding Boxes (OBBs) and axis-aligned bounding boxes (AABBs). I have the OBB-OBB intersection using the Separating Axis Theorem (SAT) and I'm ...
4 votes
1 answer
3k views

### Circle - Line segment collision

I wrote an implementation of circle - line segment collision detection algorithm. Here is quick demonstration how it works: And here is my implementation in Javascript using HTML canvas: index.html ...
• 315
4 votes
1 answer
871 views

### Simple class game hierarchy with collision detection

I'm trying to make the transition from the 'understand how standalone features work' phase to writing.. more 'complex' code that could actually see use in real life, so I've been trying find some neat,...
7 votes
2 answers
7k views

### Find the intersect area of two overlapping rectangles

This is my solution to find the coordinates of 2 overlapped rectangles implemented in JavaScript. Each rectangle is represented by 2 points, each with 2 (x,y) coordinates. Can this code be improved?...
4 votes
1 answer
588 views

### Octree Implementation

The fn_AABB struct represents an axis aligned bounding box, by a center(position) and half lengths(hwidth). They also contain a set of planes for use in collision but that is not important to the ...
• 179
6 votes
1 answer
381 views

### Handling collision on a turn-based 2D game

I have implemented a collision check algorithm that I have created for my game, and the algorithm uses recursion. Now it all works fine, and I thought to myself, what if there was a way to solve this ...
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4 votes
1 answer
359 views

grid.h ...
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5 votes
0 answers
237 views

Old code ...
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1 vote
1 answer
84 views

### Collision manager

I have a chunk of code that's working properly but it's way too complicated to read: ...
5 votes
1 answer
329 views

### Collision detection method

I think everyone has some code they are embarrassed and not proud of and today I have decided to show mine. I'm not sure how to go about making this more efficient. At the time I was just happy it did ...
• 51
-2 votes
1 answer
6k views

### C++ Erasing an object from vector of pointers

I am making this simple game in SFML and I have this vector of pointers std::vector<Brick*> bricks; which stores objects of class ...
3 votes
2 answers
721 views

### Maximize the number of PyGame sprites, with collision detection

I was trying to see what is the highest number of moving and colliding boxes (sprites) I could get in pygame? So that I could start working on game I want, I searched google and I found different ...
2 votes
2 answers
654 views

### Checking whether a bullet has hit a Space Invader

I just (almost) finished a Space-Invaders game in Javascript. I have a few bugs to clear out of the way but meanwhile I wanted to ask how I can improve the method I use to test if one of my 'Bullets' ...
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1 vote
2 answers
384 views

### Javascript collision check

I have code to find images in my selections. But when nothing in selection (loop FOR) and selection is kinda big, it's kinda laggy. How can I improve my code? ...
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5 votes
0 answers
270 views

### 2D Game - Ray-cast collision handling

This code is an excerpt from an infinite platformer I'm working on for fun. It belongs to the class GameObject from which every object i.e platforms, player, ...
• 301
13 votes
2 answers
10k views

### 2D Collision Detection

I wrote this a while ago but wanted to see if I went about it the right way and if my brain is working correctly. I was thinking about these two projects the other day and I recently released the ...
• 325
2 votes
2 answers
2k views

### High performance, branchless Intersection testing: sphere-aabb & aabb-aabb

From my tests: AABB-Sphere: 2954.8 tests per ms. AABB-AABB: 1087.0 tests per ms. The sphere test is almost 3 times faster, but the two intersection tests seem to perform about the same number ...
• 29
3 votes
1 answer
1k views

### Simple geometry problems involving rectangles and circles in Python 3

I'm working with some simple geometry problems featuring rectangles and circles. My code is as follows: ...
7 votes
1 answer
182 views

### Kattis "Hitting the Targets" utilizing a polymorphic relashionship

In order to learn C++ I have written a solution to this Kattis "Hitting the Targets" problem Basically the program is to accept some shapes (circles and rectangles) on std in and a set of points and ...
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1 vote
1 answer
249 views

### Log collisions in generating unique random strings

I've created a small class to generate unique random strings. It works fine. I also want to log the collisions of the generated strings. I check if the generated string is in the array for uniquness: ...
• 199
6 votes
2 answers
840 views

### Computing intersections of a Polyline and a line

I wrote a script to compute / interpolate the nodes of a Polyline at a given latitude, input_lat. It works for my purpose but I am wondering if there is a better, ...
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