You're reading from Learning Design Patterns with Unity Learn the secret of popular design patterns while building fun, efficient games in Unity 2023 and C#

Product type Paperback

Published in May 2024

Publisher Packt

ISBN-13 9781805120285

Length 676 pages

Edition 1st Edition

Languages

Tools

Unity

Concepts

Design Patterns

Author (1):

Harrison Ferrone

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Table of Contents (23) Chapters

Preface

1. Priming the System FREE CHAPTER

2. Managing Access with the Singleton Pattern

3. Spawning Enemies with the Prototype Pattern

4. Creating Items with the Factory Method Pattern

5. Building a Crafting System with the Abstract Factory Pattern

6. Assembling Support Characters with the Builder Pattern

7. Managing Performance and Memory with Object Pooling

8. Binding Actions with the Command Pattern

9. Decoupling Systems with the Observer Pattern

10. Controlling Behavior with the State Pattern

11. Adding Features with the Visitor Pattern

12. Swapping Algorithms with the Strategy Pattern

13. Making Monsters with the Type Object Pattern

14. Taking Data Snapshots with the Memento Pattern

15. Dynamic Upgrades with the Decorator Pattern

16. Converting Incompatible Classes with the Adapter Pattern

17. Simplifying Subsystems with the Façade Pattern

18. Generating Terrains with the Flyweight Pattern

19. Global Access with the Service Locator Pattern

20. The Road Ahead

21. Other Books You May Enjoy

22. Index

Creating a save system

Imagine you’re coming into a game project as a new developer and your first assignment is to create a system for saving user data, which includes the player’s stats, weapon, and weapon modifications (if they’ve collected any). Development is already pretty far along, so you’re not allowed to mess with any of the existing classes that manage all the fun stuff, but you have access to the player and, therefore, indirect access to its stats, weapon, and mods.

Since the Player object has a set structure, you know exactly what needs to be done – implement the Visitor pattern and create a data-saving visitor that can be applied to each of the player component elements without changing the underlying objects.

We’ll do this with a combination of interfaces, concrete elements, and, of course, a Visitor class, all of which are covered in the following subsections.