Uploaded June 2021 | Updated September 2026, 1 week ago

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This is probably the easiest and the most useful algorithm you should learn if you want to create awesome games and JavaScript animations. Collision detection between circles in JavaScript first calculates the distance between two centre points and compares it to sum of radii of these two circles. Let me show you everything you need to know about detecting circle collisions and show you some awesome projects you can build with it. It's time to talk about Pythagorean theorem! :)

⭐️TABLE OF CONTENT ⭐️
00:00 Why do we need collision detection
00:30 How to detect collision between 2 circles in JavaScript
01:30 How to measure distance between 2 points
03:00 Pythagorean theorem explained
04:17 Comparing distance and radius to determine the outcome

❤ Related Links ❤
Pythagorean Theorem: Proof, Applications and JavaScript Code (Radu) youtu.be/iqSlzYXdFzw
Art by bevouliin.com

You can practice techniques we learned to day in these vanilla JavaScript game tutorials:
Particle trail effect: youtu.be/Yvz_axxWG4Y
Fish game: youtu.be/jl29qI62XPg

🎮 Game Development MASTERCLASS SERIES with vanilla JavaScript, basics for beginners: 🎮
🐶 Project 1: Sprite animation youtu.be/CY0HE277IBM
🐶 Project 2: Parallax backgrounds youtu.be/Mg7ibYWhjPI
🐶 Project 3: NPC movement youtu.be/pyhb8Y9qKUI
🐶 Project 4: Rectangle collision youtu.be/r0sy-Cr6WHY
🐶 Project 5: *** this video ***
🐶 Project 6: Triggered event based animations youtu.be/Eg_zUEy_lDE
🐶 Project 7: Raven game youtu.be/gCa0z4B-CRo
🐶 Project 8: Enemy types youtu.be/aEDADLtLEbk
🐶 Project 9: State Management youtu.be/jKe44NeFzwE
🐶 Project 10: Easy Side-Scroller Game youtu.be/7JtLHJbm0kA

For most projects all we need is simple collision detection algorithm between two rectangles or between two circles. For more complex shapes, we can also use collision detection technique called separating axis theorem. It can be used to detect collision between convex polygons or rectangles that are rotated and aren't axis aligned.

🔥 I really like these GAMEDEV and GAME ART courses on Udemy 🔥
☕ How to Program Games: Tile Classics in JS for HTML5 Canvas bit.ly/2ZUfKuG
☕ Learn Professional 2D Game Graphic Design in Photoshop bit.ly/2SpPdE8
☕ The Ultimate 2D Game Character Design & Animation Course bit.ly/3eoZWqT
☕ Produce Professional Pixel Art for Your New Game bit.ly/3nUrTKm
Get Adobe creative suite apps (Photoshop, Illustrator etc.) bit.ly/3e60cI0

🎮 More HTML5 canvas and JavaScript game tutorials:
youtube.com/playlist?list=PLYElE_rzEw_sowQGjRdvwh9eAEt62d_Eu

If you are a BEGINNER you can still create beautiful animations, here is a selection of my beginner friendly projects, where I go slower and take time to explain things:
youtube.com/playlist?list=PLYElE_rzEw_v8TXJ_ITSSBP_ypUKfQ7K-

If you feel more confident in your coding skills, check out some more ADVANCED ANIMATIONS with vanilla JavaScript & HTML5 canvas:
youtube.com/playlist?list=PLYElE_rzEw_siuo-kkHh5h7Sk--6IPYNh

Let's be friends
👍 You can message me on TWITTER twitter.com/code_laboratory
👍 Check out some of my source code on CODEPEN codepen.io/franksLaboratory

Music: (YouTube audio library) Vacay In Fiji Riddim - Konrad OldMoney
The description of this video may contain affiliate links, which means that if you buy one of the products that I recommend, I'll receive a small commission without any additional cost for you. This helps to support the channel and allows me to continue making videos like this. Thank you for the support!
#frankslaboratory