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)
Sections 1: Fundamentals
Section 2: Core Patterns
Section 3: Alternative Patterns
About Packt

Steps to implementing an enemy drone

Let's start by implementing the main ingredients of the Strategy pattern:

  1. Our first element is the Strategy interface; all our concrete strategies will use it:
namespace Chapter.Strategy
public interface IManeuverBehaviour
void Maneuver(Drone drone);

Note that we are passing a parameter of the Drone type to the Maneuver() method. This is an important detail we will review later.

  1. Next up is our Drone class; it's going to use our concrete strategies, so in the overall structure of the Strategy pattern, we will consider it to be our Context class:
using UnityEngine;

namespace Chapter.Strategy {
public class Drone : MonoBehaviour {

// Ray parameters
private RaycastHit _hit;
private Vector3 _rayDirection;
private float _rayAngle = -45.0f;
private float _rayDistance = 15.0f;

// Movement parameters
public float speed = 1.0f;
public float maxHeight = 5.0f;