Uploaded July 2020 | Updated September 2026, 2 weeks ago

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Join the Discord: discord.gg/4tHeAkxNg7

In this tutorial, I describe how to tell if a circle is colliding with another primitve shape. I go over how to tell if a circle is colliding with a circle, axis aligned box (AABB), or rotated box (OBB). After I describe the mathematics for each of these, I discuss how to code the functions so that we can use it as part of our physics engine.

Source Code: github.com/codingminecraft/MarioYoutube/tree/f8726fb2528e100045bc30ec2e9181e5a7c69f40

0:00 Intro
0:49 Circle Vs Circle Math
2:25 Circle Vs Circle Coding
4:27 Circle Vs Box Math
8:17 Circle Vs Box Coding

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Website: ambrosiogabe.github.io
Github: github.com/ambrosiogabe

Here are some books I recommend if you want to learn about game engine development more thoroughly. I do not profit off any of these sales, these are just some books that have helped me out :)

My Recommended Game Engine Books:
Game Engine Architecture: gameenginebook.com
Game Physics Cookbook (Read this before the next physics book): amazon.com/Game-Physics-Cookbook-Gabor-Szauer/dp/1787123669
Game Physics (Ian Millington): amazon.com/Game-Physics-Engine-Development-Commercial-Grade/dp/0123819768
Game Programming Patterns (Free): gameprogrammingpatterns.com

My Recommended Beginning Game Programming Books:
JavaScript Game Design: apress.com/gp/book/9781430247166

My Recommended Java Books:
Data Structures/Algorithms: amazon.com/Data-Structures-Algorithms-Java-6th-ebook/dp/B00JDRQF8C
LWJGL (Free, but I haven't read this thoroughly): lwjglgamedev.gitbooks.io/3d-game-development-with-lwjgl/content

Outro Music: bensound.com/royalty-free-music