[go: up one dir, main page]

Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Save more on your purchases! discount-offer-chevron-icon
Savings automatically calculated. No voucher code required.
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Newsletter Hub
Free Learning
Arrow right icon
timer SALE ENDS IN
0 Days
:
00 Hours
:
00 Minutes
:
00 Seconds
Game Development Patterns with Godot 4
Game Development Patterns with Godot 4

Game Development Patterns with Godot 4: Create resilient game systems using industry-standard solutions in Godot

Arrow left icon
Profile Icon Henrique Campos
Arrow right icon
$30.99 $44.99
Paperback Jan 2025 304 pages 1st Edition
eBook
$20.99 $35.99
Paperback
$30.99 $44.99
Subscription
Free Trial
Renews at $19.99p/m
Arrow left icon
Profile Icon Henrique Campos
Arrow right icon
$30.99 $44.99
Paperback Jan 2025 304 pages 1st Edition
eBook
$20.99 $35.99
Paperback
$30.99 $44.99
Subscription
Free Trial
Renews at $19.99p/m
eBook
$20.99 $35.99
Paperback
$30.99 $44.99
Subscription
Free Trial
Renews at $19.99p/m

What do you get with Print?

Product feature icon Instant access to your digital copy whilst your Print order is Shipped
Product feature icon Colour book shipped to your preferred address
Product feature icon Redeem a companion digital copy on all Print orders
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Product feature icon AI Assistant (beta) to help accelerate your learning
OR
Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Table of content icon View table of contents Preview book icon Preview Book

Game Development Patterns with Godot 4

Understanding Object-Oriented Design

Let’s commence our journey by learning about what Object-Oriented Programming (OOP) is first because as we start implementing different patterns throughout the book, they will all approach the presented problems from an OOP perspective. For example, you will notice that the State pattern turns an object’s states into other objects. The Command pattern turns an object’s functions into objects. The Strategy pattern turns an object’s logic branching into objects. So, it’s important to understand what OOP is and why it is the main programming paradigm for developing games.

In this chapter, we will explore this paradigm from a unique standpoint that will help you understand it better and even approach programming and coding from a different perspective. We will approach it from the perspective of the philosophy of language. The reason for this is that as human beings, the way we solve problems is by structuring them...

Technical requirements

Throughout this book, we will use the projects presented in the official repository. Each chapter has its distinct folder named after the chapter. Inside the chapter’s folder, you will find two sub-folders:

  • start/
  • final/

To follow along with the chapter’s instructions, use the project files available inside the start folder. You can use the files presented in the final folder as a reference in case you feel lost or get errors or bugs through the process of following the instructions. You can download the repository files at https://github.com/PacktPublishing/Game-Development-Patterns-with-Godot-4.

For this book, you will also need, of course, Godot Engine version 4.3 and beyond, which you can find at https://godotengine.org/download/archive/4.3-stable/.

On top of that, it’s recommended that you have a computer with dedicated video drives due to Godot Engine’s Vulkan render. All the projects are under the Compatibility...

Learning the basics of OOP

When we talk about programming, we are trying to convey the idea of a structured formalization of a solution to a given problem. This is what an algorithm is, and to program is to be able to formalize such solutions in such a way that everyone can follow the steps and get the same result. In that sense, programming is almost a science. However, the philosophical aspect of this craft is that we work with how each individual approaches the problem. Drawing from their own knowledge and experiences, they implement a variety of solutions, all of which can achieve the same goal.

The computer comes in to automate the implementation of the solutions that we created. Computers are pretty standard when it comes to reasoning, so they are perfect for following instructions as they won’t pollute the solution with subjective matters and will be as accurate as the instructions allow. Note that we are going to avoid the engineering aspects of computing here. I...

Complying with the principles of OOP

When it comes to OOP, things can get messy quickly. OOP is a powerful paradigm to work with that allows us to leverage our own code to increase productivity while developing software. As we will see throughout Part 1, especially in Chapter 2, working with OOP demands that we approach it with the correct mindset so we don’t get side-tracked and end up with code that is inferior to what we would achieve with other paradigms.

We are going to see in Chapter 2, that OOP has four main tools to help us build good, reusable, and scalable code. When we get into Chapter 3, you will also learn that there are design principles to prevent some common issues that can hurt your code’s base health. These will become second nature to you as you become more experienced. To be honest, once you understand what they mean and why it’s important to follow them, you will see that they make a lot of sense and are actually pretty obvious.

However...

Designing games with OOP

It’s time to put our knowledge into practice. In this section, we will design an object based on a prompt made by a fictional game designer. The goal is to understand the demands of the game designer, as well as to identify the data and behaviors that an object would need in order to fulfill the request.

OOP is especially useful in game development due to the intricate nature of games. When it comes to applications, other paradigms can often better fulfill the requirements. Think about it for a second. In many applications, as long as some data comes from the user’s input and the application provides those users with the desired output, it’s OK. The idea of maintaining and mutating states is unnecessary in most cases. Now, in games, it’s important that objects are kept in memory and react to each state of the application. We can’t simply render a page and wait for players to react to it. Games have a game loop, where everything...

Turning your design into an object in Godot Engine

After creating an interface for our class, we can dive into the implementation details. In this section, we will create a PopLabel object, which is an object that pops up on the screen displaying text and then fades away. If you have some experience with Godot Engine, you may already have some solutions in mind, right? However, let’s follow the steps in this section to get the following results:

Figure 1.1 – Text popping up on the screen after the player collects diamonds

Figure 1.1 – Text popping up on the screen after the player collects diamonds

With the repository on your computer, open the project in the 01.understanding-object-oriented-programming/start/ folder and then follow these steps:

  1. Create a new scene using a Node2D node as the root node. Remember, our object needs position, scale, and some way to change its alpha color, which the Node2D’s Modulate property allows us to do.
  2. Rename it to PopLabel, since ultimately we will use a Label...

Summary

In this chapter, we learned that OOP is foundational to understanding and applying the design patterns that will be discussed throughout this book. With a unique approach from a philosophy of language perspective, this paradigm is emphasized as crucial for structuring solutions to problems in a way that aligns with human problem-solving processes. The essence of OOP allows us to abstract our solutions into classes, where each class is a blueprint of how to solve a problem, including the necessary data and the methods to manipulate this data. This abstraction enables us to think about solutions in a more structured way, making it easier to test these solutions in various contexts by creating instances (or objects) of these classes.

Furthermore, the chapter delved into the basics of OOP, stressing the importance of understanding programming as a structured formalization of solutions to problems. By treating classes as super data types that encapsulate both data and the procedures...

Left arrow icon Right arrow icon
Download code icon Download Code

Key benefits

  • Save time and avoid pitfalls in game development with proven design patterns
  • Leverage the tools in the Godot editor to benefit from native implementations of design patterns such as the observer and singleton
  • Learn SOLID principles and refactoring techniques to build scalable, reusable architectures for robust games
  • Purchase of the print or Kindle book includes a free PDF eBook

Description

Game development demands more than just creativity; it requires code that’s as dynamic and adaptable as the games you dream of creating. Seasoned Godot developer, educator and creator of popular resources like The Essential Guide to Creating Multiplayer Games with Godot 4.0, Henrique Campos introduces you to object-oriented programming design patterns, offering time-tested, reliable solutions to common coding issues. With these patterns, you’ll not only build scalable, maintainable architectures for your games but also gain the confidence to tackle real-world development challenges head-on with Godot's built-in features. In this hands-on guide, you’ll step into the role of a game mechanics engineer tasked with implementing requests from a fictional game designer, simulating the collaborative nature of real-world game development. Using Godot 4.3, you’ll develop a complete platformer game featuring a playable character, enemies with advanced AI, interactive objects, multiple levels, music, and more. Along the way, you’ll master core programming concepts such as SOLID principles, favor composition over inheritance, and have a solid understanding of object-oriented programming along with the principles behind the design patterns. By the end of the book, you’ll be able to diagnose and fix pathologies in your code with ease.

Who is this book for?

If you are a game developer, game designer, technical artist, or solo developer with programming experience in Godot Engine and the GDScript programming language, this book is for you. Prior knowledge of programming concepts (e.g., functions, variables, algorithms) and an understanding of Godot's nodes and resources philosophy are essential to fully benefit from this book. Perfect for professionals looking to create solid, reusable, and reliable architecture that can adapt and grow with their creative vision.

What you will learn

  • Create reusable and scalable code that follows SOLID principles
  • Identify common game development issues and apply industry-standard solutions
  • Understand feature requests and how to turn them into concrete solutions leveraging design patterns
  • Analyze game development pathologies to figure out underlying issues
  • Architect reliable systems that are understandable, intuitive, and scalable
  • Structure professional, collaborative game systems that are easy to maintain
Estimated delivery fee Deliver to South Africa

Standard delivery 10 - 13 business days

$12.95

Premium delivery 3 - 6 business days

$34.95
(Includes tracking information)

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Jan 10, 2025
Length: 304 pages
Edition : 1st
Language : English
ISBN-13 : 9781835880289
Languages :
Concepts :
Tools :

What do you get with Print?

Product feature icon Instant access to your digital copy whilst your Print order is Shipped
Product feature icon Colour book shipped to your preferred address
Product feature icon Redeem a companion digital copy on all Print orders
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Product feature icon AI Assistant (beta) to help accelerate your learning
OR
Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Estimated delivery fee Deliver to South Africa

Standard delivery 10 - 13 business days

$12.95

Premium delivery 3 - 6 business days

$34.95
(Includes tracking information)

Product Details

Publication date : Jan 10, 2025
Length: 304 pages
Edition : 1st
Language : English
ISBN-13 : 9781835880289
Languages :
Concepts :
Tools :

Packt Subscriptions

See our plans and pricing
Modal Close icon
$19.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
$199.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just $5 each
Feature tick icon Exclusive print discounts
$279.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just $5 each
Feature tick icon Exclusive print discounts

Table of Contents

18 Chapters
Part 1: Object-Oriented Design Principles Chevron down icon Chevron up icon
Chapter 1: Understanding Object-Oriented Design Chevron down icon Chevron up icon
Chapter 2: Learning the Four Fundamental Pillars Chevron down icon Chevron up icon
Chapter 3: Creating SOLID Design Solutions Chevron down icon Chevron up icon
Chapter 4: Favoring Composition Over Inheritance Chevron down icon Chevron up icon
Part 2: Basic Design Patterns Chevron down icon Chevron up icon
Chapter 5: Maintaining Global States with the Singleton Pattern Chevron down icon Chevron up icon
Chapter 6: Decoupling Objects with the Observer Pattern Chevron down icon Chevron up icon
Chapter 7: Spawning Game Objects with the Factory Pattern Chevron down icon Chevron up icon
Chapter 8: Changing Object Behavior with the State Pattern Chevron down icon Chevron up icon
Chapter 9: Designing Actors with the Command Pattern Chevron down icon Chevron up icon
Part 3: Advanced Design Patterns Chevron down icon Chevron up icon
Chapter 10: Implementing AI with the Strategy Pattern Chevron down icon Chevron up icon
Chapter 11: Creating a Power-Up System with the Decorator Pattern Chevron down icon Chevron up icon
Chapter 12: Cross-Fading Transitions with the Service Locator Pattern Chevron down icon Chevron up icon
Chapter 13: Improving Game Feel with the Event Queue Pattern Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

What is the digital copy I get with my Print order? Chevron down icon Chevron up icon

When you buy any Print edition of our Books, you can redeem (for free) the eBook edition of the Print Book you’ve purchased. This gives you instant access to your book when you make an order via PDF, EPUB or our online Reader experience.

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela