Refactoring and Physics | Coding a 2D Game Engine in Java #40 @GamesWithGabe
Refactoring and Physics | Coding a 2D Game Engine in Java #40  @GamesWithGabe
Uploaded December 2020 | Updated September 2026, 3 weeks ago
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In this episode I go over how to finish integrating Box2D into our game engine, and several different odds and ends. I go over fixing the projection size of our camera to match a more realistic camera field of view, changing the pivot point of objects to the center, modifying imgui code so that we can use enums, duplicating and deleting game objects, and editing the z index.

Source Code: github.com/codingminecraft/MarioYoutube/tree/7adc025152617ca1b194c552868f2dfc6a9da78a

0:00 Intro
1:28 Visual Explanation
4:32 Fixing the Camera Projection
8:07 Changing the Pivot Point to Center
10:41 Adding Enum Dropdown Support for ImGui
16:42 Fixing ImGui Transform Rotation
18:31 Duplicating Game Objects
25:03 Deleting Game Objects
26:10 Editing ZIndex at Runtime

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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
Refactoring and Physics | Coding a 2D Game Engine in Java #40Intro | Coding a 2D Game Engine in Java #0Compiling and Intro (Windows)  | C++ For Java Devs Ep. 12D Animations | Coding a 2D Game Engine in Java #45Point vs. Primitives | Coding a 2D Physics Engine in Java #4Z-Index Rendering | Coding Geometry Dash in Java #20Iterative Linear Impulse Resolution | Coding a 2D Physics Engine in Java #15ImGui in LWJGL (UPDATE) | LWJGL Series #3Coding Gravity | Coding Geometry Dash in Java #9Deserialization Part 1 | Coding Geometry Dash in Java #15Generating Font SDFs (Signed Distance Fields) | Font Rendering in Java #4Serialization with Gson | Coding a 2D Game Engine in Java #19
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Refactoring and Physics | Coding a 2D Game Engine in Java #40

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