The Math Formula Every Game Developer Needs to Know

What is one of the most useful pieces of MATH every game developer should know? The Pythagorean theorem! Let’s use it to detect collisions. In this episode, we build a fully animated HUD and layered health bar, create a reusable collision system, and allow player to be damaged using event-driven logic. Let's make web games with vanilla JavaScript! You’ll learn: How to build an animated health bar with CSS variables Event-driven game architecture using emitters Circle-vs-circle collision detection Why squared distance checks are faster than using square roots Data-driven asset loading with map() and Object.values() How CollisionManager and CollisionSystem work together How to keep game.js clean and modular Better ways to structure larger JavaScript game projects This is part of a full vanilla JavaScript game development series, where we’re building a reusable starter kit step by step: https://youtube.com/playlist?list=PLYElE_rzEw_tjnJ_5gzRw0ZM5HRn7AIS0&si=j53kz7v7JoN5dg1B Resources: Source code (up to part 16): https://code-laboratory.kit.com/f901806818 ⏱ Timestamps 00:00 The Most Important Formula in 2D Game Dev 01:24 Source Code Checkpoint (P16) 04:04 Choosing Our Next Game System 09:30 Data-Driven Audio Loading 12:26 Data-Driven Image Loading 15:55 Source Code Checkpoint (P17) 16:26 Building a Collision & Damage System 25:09 Animated Health Bar with Events Tiny details like hit reactions, UI animation, and sound feedback completely change how a game feels. Most games are really just layers of systems constantly communicating with each other in real time, so let’s learn how to build a flexible, reusable collision system for our 2D games. This class is for beginners and intermediate developers interested in JavaScript game development, 2D game programming, and game architecture design. Whether you're building a top-down shooter, roguelike, survival game, or browser-based HTML5 canvas game, these techniques will help you create cleaner systems, better game feel, and more scalable code. We’ll work with vanilla JavaScript, object-oriented programming, collision detection algorithms, event-driven systems, reusable managers, and responsive UI effects commonly used in real game development workflows. If you want more videos like this, don’t forget to like and subscribe! #JavaScriptGameDevelopment #VanillaJavaScript #HTML5Canvas #frankslaboratory