The Command Pattern: Coding Undo/Redo | Game Engine Concepts #3
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In this episode I explain what the Command Pattern is and how you can use it. Before I explain what the Command Pattern is I explain what a design pattern is and reference the Gang of Four's original book, Design Patterns. After that, I explain that the Command Pattern is simply a wrapper around executing commands. I then illustrate how this can be used in conjunction with a Command History object to create an undo/redo system, record gameplay sessions, and create instant replays. I describe in detail how you might code this, then I show an actual example that I use in my code to implement undo/redo system.
The Command Pattern: https://gameprogrammingpatterns.com/command.html
Gang of Four Book: https://www.amazon.com/Design-Patterns-Object-Oriented-Addison-Wesley-Professional-ebook/dp/B000SEIBB8
Command Code Example: https://github.com/ambrosiogabe/Cocoa/tree/master/CocoaEngine/include/cocoa/commands
Command History Code Example: https://github.com/ambrosiogabe/Cocoa/blob/master/CocoaEngine/cpp/cocoa/commands/CommandHistory.cpp
0:00 Intro
0:31 What is a Programming Pattern?
1:39 What is the Command Pattern?
13:39 What does the Code Look Like?
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Website: https://ambrosiogabe.github.io/
Github: https://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: https://www.gameenginebook.com/
Game Physics Cookbook (Read this before the next physics book): https://www.amazon.com/Game-Physics-Cookbook-Gabor-Szauer/dp/1787123669
Game Physics (Ian Millington): https://www.amazon.com/Game-Physics-Engine-Development-Commercial-Grade/dp/0123819768
Game Programming Patterns (Free): https://gameprogrammingpatterns.com/
My Recommended Beginning Game Programming Books:
JavaScript Game Design: https://www.apress.com/gp/book/9781430247166
My Recommended Java Books:
Data Structures/Algorithms: https://www.amazon.com/Data-Structures-Algorithms-Java-6th-ebook/dp/B00JDRQF8C
LWJGL (Free, but I haven't read this thoroughly): https://lwjglgamedev.gitbooks.io/3d-game-development-with-lwjgl/content/
Outro Music: https://www.bensound.com/royalty-free-music