Book Image

Game Development Patterns with Unity 2021 - Second Edition

By : David Baron
Book Image

Game Development Patterns with Unity 2021 - Second Edition

By: David Baron

Overview of this book

This book is written for every game developer ready to tackle the bigger picture and start working with advanced programming techniques and design patterns in Unity. Game Development Patterns with Unity 2021 is an introduction to the core principles of reusable software patterns and how to employ them to build components efficiently. In this second edition, you'll tackle design patterns with the help of a practical example; a playable racing game prototype where you’ll get to apply all your newfound knowledge. Notable updates also include a game design document (GDD), a Unity programming primer, and the downloadable source code of a complete prototype. Your journey will start by learning about overall design of the core game mechanics and systems. You’ll discover tried-and-tested software patterns to code essential components of a game in a structured manner, and start using classic design patterns to utilize Unity's unique API features. As you progress, you'll also identify the negative impacts of bad architectural decisions and understand how to overcome them with simple but effective practices. By the end of this Unity book, the way you develop Unity games will change – you’ll adapt a more structured, scalable, and optimized process that will help you take the next step in your career.
Table of Contents (22 chapters)
1
Sections 1: Fundamentals
5
Section 2: Core Patterns
16
Section 3: Alternative Patterns
20
About Packt

Implementing the replay system

The implementation will be done in two parts. In the first part, we will code the core components of the Command pattern and then we will integrate the elements that are necessary to test the replay system:

  1. To start, we are implementing a base abstract class named Command, which has a singular method named Execute():
public abstract class Command
{
public abstract void Execute();
}
  1. Now we are going to write three concrete command classes that will derive from the Command base class, and then we will implement the Execute() method. Each of them encapsulates an action to execute.

The first one toggles the turbocharger on BikeController:

namespace Chapter.Command
{
public class ToggleTurbo : Command
{
private BikeController _controller;

public ToggleTurbo(BikeController controller)
{
_controller = controller;
}

public override void Execute()
{
_controller.ToggleTurbo();
...