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Home > Game Development > Game Scripting > Learning C# by Developing Games with Unity 5.x
Learning C# by Developing Games with Unity 5.x
Learning C# by Developing Games with Unity 5.x

Learning C# by Developing Games with Unity 5.x: Develop your first interactive 2D platformer game by learning the fundamentals of C# , Second Edition

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Learning C# by Developing Games with Unity 5.x

Chapter 2. Introducing the Building Blocks for Unity Scripts

A programming language like C# can appear to be very complicated at first, but in reality, there are two basic parts that form its foundation. These parts are variables and methods. Therefore, understanding these critical parts is very necessary for learning any of the other features of C#. As critical as they are, they are very simple concepts to understand. Using these variable and method foundation pieces, we'll introduce the C# building blocks that are used to create Unity scripts.

For those who get sweaty palms by just thinking of the word script, wipe your hands and relax! In this chapter, I'm going to use terms that are already familiar to you to introduce the building blocks of programming. The following are the concepts introduced in this chapter:

  • Using variables and methods in scripts
  • The class, which is a container for variables and methods
  • Turning a script into a component
  • Components that communicate...

Understanding what a variable is and what it does

What is a variable? Technically, it's a tiny section of your computer's memory that will hold any information that you put there. While a game is running, it keeps track of where the information is stored, the value kept there, and the type of that value. However, for this chapter, all you need to know is how a variable works. It's very simple.

What's usually in a mailbox, besides air? Well, usually there's nothing, but occasionally there is something in it. Sometimes, there are letters, bills, a spider, and so on. The point is that what is in a mailbox can vary. Therefore, let's call each mailbox a variable.

In the game development world, some simple examples of variables might be:

  • playerName
  • playerScore
  • highestScore

Naming a variable

Using the example of the mailbox, if I asked you to see what is in the mailbox, the first thing you'd ask is, "Which one?" If I say in the Smith mailbox, the brown mailbox...

What is a method?

When we write a script, we are making lines of code that the computer is going to execute, one line at a time. As we write our code, there will be things that we want our game to execute more than once. For example, we can write a piece of code that adds two numbers. Suppose our game needs to add those two numbers a hundred different times during gameplay. So you'd say, "Wow! I have to write the same code a hundred times to add two numbers together? There has to be a better way."

Let a method take away your typing pain. You just have to write the code to add two numbers once and then give this chunk of code a name, such as AddTwoNumbers(). Now, every time your game needs to add two numbers, don't write the code over and over; just call the AddTwoNumbers() method.

Using the term "method" instead of "function"

You are constantly going to see the words "function" and "method" used everywhere as you learn how to code...

Introducing the class

The class plays a major role in Unity. Most of your code will be written inside classes. Think about it like a container for variables and methods.

You just learned about variables and methods. These two items are the building blocks used in Unity scripts. The term "script" is used everywhere in discussions and documents. Look for it in the dictionary, and you will see that it can generally be described as written text. Sure enough, that's what we have. However, since we aren't just writing a screenplay or passing a note to someone, we need to learn the actual terms used in programming.

Unity calls the code it creates a C# script. However, people like me have to teach you some basic programming skills and tell you that a script is really a class.

Note

In the previous section about methods, we created a class (script) called LearningScript. It contained a couple of variables and a method. The main concept, or idea, of a class is that it's a container...

The Start(), Update(), and Awake() methods and the execution order

The Start(), Update(), and Awake() methods are called automatically. The Start() method is called on the frame when the script is enabled. For most of our components, this will be when you press the Start button in Unity.

The Awake() method is called just before the Start() method. That gives a very convenient place to set up code if you have any. The Update() method is very specific. It's called on every frame if the component is enabled. It's very useful for observing user keyboard actions, for example. As you can see in our script, in Line 16, we are checking on every frame to know whether the user has pressed the Enter key.

Let's create a new C# Script and call it LearningMethods. As you can see, the Start() and Update() methods are added automatically when you create a new script. To test them all, all that we need to do is add the Awake() method and a few other useful lines to print something on the Console...

Components that communicate using dot syntax

Our script has variables for holding data, and our script has methods to allow tasks to be performed. I now want to introduce the concept of communicating with other GameObjects and the components they contain. Communication between one components GameObject and another component GameObject using dot syntax is a vital part of scripting. It's what makes interaction possible. We need to communicate with other components or GameObjects to be able to use the variables and methods in other components.

What's with the dots?

When you look at code written by others, you'll see words with periods separating them. What the heck is that? It looks complicated, doesn't it. The following is an example from the Unity documentation:

transform.position.x

Note

Don't concern yourself with what the preceding code means, as that comes later. I just want you to see the dots.

This is called dot syntax. The following is another example. It's...

Understanding what a variable is and what it does

What is a variable? Technically, it's a tiny section of your computer's memory that will hold any information that you put there. While a game is running, it keeps track of where the information is stored, the value kept there, and the type of that value. However, for this chapter, all you need to know is how a variable works. It's very simple.

What's usually in a mailbox, besides air? Well, usually there's nothing, but occasionally there is something in it. Sometimes, there are letters, bills, a spider, and so on. The point is that what is in a mailbox can vary. Therefore, let's call each mailbox a variable.

In the game development world, some simple examples of variables might be:

  • playerName

  • playerScore

  • highestScore

Naming a variable

Using the example of the mailbox, if I asked you to see what is in the mailbox, the first thing you'd ask is, "Which one?" If I say in the Smith mailbox, the brown mailbox, or the round mailbox, you'll know...

What is a method?

When we write a script, we are making lines of code that the computer is going to execute, one line at a time. As we write our code, there will be things that we want our game to execute more than once. For example, we can write a piece of code that adds two numbers. Suppose our game needs to add those two numbers a hundred different times during gameplay. So you'd say, "Wow! I have to write the same code a hundred times to add two numbers together? There has to be a better way."

Let a method take away your typing pain. You just have to write the code to add two numbers once and then give this chunk of code a name, such as AddTwoNumbers(). Now, every time your game needs to add two numbers, don't write the code over and over; just call the AddTwoNumbers() method.

Using the term "method" instead of "function"

You are constantly going to see the words "function" and "method" used everywhere as you learn how to code.

Note

The words "function" and "method" truly mean the same thing...

Introducing the class

The class plays a major role in Unity. Most of your code will be written inside classes. Think about it like a container for variables and methods.

You just learned about variables and methods. These two items are the building blocks used in Unity scripts. The term "script" is used everywhere in discussions and documents. Look for it in the dictionary, and you will see that it can generally be described as written text. Sure enough, that's what we have. However, since we aren't just writing a screenplay or passing a note to someone, we need to learn the actual terms used in programming.

Unity calls the code it creates a C# script. However, people like me have to teach you some basic programming skills and tell you that a script is really a class.

Note

In the previous section about methods, we created a class (script) called LearningScript. It contained a couple of variables and a method. The main concept, or idea, of a class is that it's a container of data, stored in variables...

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Key benefits

  • Get to grips with the fundamentals of scripting in C# with Unity
  • Create an awesome, 2D platformer game from scratch using the principles of object-oriented programming and coding in C#
  • This is a step-by-step guide to learn the fundamentals of C# scripting to develop GameObjects and master the basics of the new UI system in Unity

Description

Unity is a cross-platform game engine that is used to develop 2D and 3D video games. Unity 5 is the latest version, released in March 2015, and adds a real-time global illumination to the games, and its powerful new features help to improve a game’s efficiency. This book will get you started with programming behaviors in C# so you can create 2D games in Unity. You will begin by installing Unity and learning about its features, followed by creating a C# script. We will then deal with topics such as unity scripting for you to understand how codes work so you can create and use C# variables and methods. Moving forward, you will find out how to create, store, and retrieve data from collection of objects. You will also develop an understanding of loops and their use, and you’ll perform object-oriented programming. This will help you to turn your idea into a ready-to-code project and set up a Unity project for production. Finally, you will discover how to create the GameManager class to manage the game play loop, generate game levels, and develop a simple UI for the game. By the end of this book, you will have mastered the art of applying C# in Unity.

Who is this book for?

The book is targeted at beginner level Unity developers with no programming experience. If you are a Unity developer and you wish to learn how to write C# scripts and code by creating games, then this book is for you.

What you will learn

  • Understand the fundamentals of variables, methods, and code syntax in C#
  • Get to know about techniques to turn your game idea into working project
  • Use loops and collections efficiently in Unity to reduce the amount of code
  • Develop a game using the object-oriented programming principles
  • Generate infinite levels for your game
  • Create and code a good-looking functional UI system for your game
  • Publish and share your game with users
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Publication date : Mar 31, 2016
Length: 230 pages
Edition : 2nd
Language : English
ISBN-13 : 9781785287596
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Unity Technologies
Category :
Game Development
Languages :
C#
Concepts :
Game Scripting
Tools :
Unity

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Learning C# by Developing Games with Unity 5.x
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Table of Contents

14 Chapters
1. Discovering Your Hidden Scripting Skills and Getting Your Environment Ready Chevron down icon Chevron up icon
1. Discovering Your Hidden Scripting Skills and Getting Your Environment Ready
Prerequisite knowledge to use this book
Dealing with scriptphobia
Downloading Unity
Teaching behavior to GameObjects
C# documentation – where to find it? Do I need it at all?
Working with C# script files
Creating a C# script file
Introducing the MonoDevelop code editor
Instance? What is it?
Summary
2. Introducing the Building Blocks for Unity Scripts Chevron down icon Chevron up icon
2. Introducing the Building Blocks for Unity Scripts
Understanding what a variable is and what it does
What is a method?
Introducing the class
The Start(), Update(), and Awake() methods and the execution order
Components that communicate using dot syntax
Making decisions in code
Paper and pencil are powerful tools
Summary
3. Getting into the Details of Variables Chevron down icon Chevron up icon
3. Getting into the Details of Variables
Writing C# statements properly
Understanding component properties in Unity's Inspector
Changing a property's value in the Inspector panel
Private variables
Naming your variables properly
Beginning variable names with lowercase
Using multiword variable names
Declaring a variable and its type
Assigning values while declaring a variable
Where you declare a variable is important
Variable scope – determining where a variable can be used
Summary
4. Getting into the Details of Methods Chevron down icon Chevron up icon
4. Getting into the Details of Methods
Using methods in a script
Naming methods properly
Defining a method the right way
Understanding parentheses – why are they there?
Specifying a method's parameters
Returning a value from a method
Summary
5. Lists, Arrays, and Dictionaries Chevron down icon Chevron up icon
5. Lists, Arrays, and Dictionaries
What is an array?
Storing items in the List
List<T> versus arrays
Retrieving the data from the Array or List<T>
ArrayList
Dictionaries
Summary
6. Loops Chevron down icon Chevron up icon
6. Loops
Introduction to loops
The foreach loop
The for loop
The while loop
while versus for loops
Loops in statements
Modulo
Searching for data inside an array
Breaking the loop
Summary
7. Object, a Container with Variables and Methods Chevron down icon Chevron up icon
7. Object, a Container with Variables and Methods
Working with objects is a class act
Instantiating an object
Bored yet?
Using methods with objects
Custom constructors
Overloading
Summary
8. Let's Make a Game! – From Idea to Development Chevron down icon Chevron up icon
8. Let's Make a Game! – From Idea to Development
Your first game – avoiding the trap of the never-ending concept
The idea
Breaking a complex idea into smaller parts
Jake on the mysterious planet – the feature list
Target platform and resolution
Target screen resolution
Summary
9. Starting Your First Game Chevron down icon Chevron up icon
9. Starting Your First Game
Setting up a new Unity project for our game
Preparing the player prefab
PlayerController
User input
Animator
Code
Summary
10. Writing GameManager Chevron down icon Chevron up icon
10. Writing GameManager
Gameplay loops
Singleton class
Starting the game
Setting up input keys
Using triggers
Restarting the game
Setting up the player starting position
Code in this chapter
Summary
11. The Game Level Chevron down icon Chevron up icon
11. The Game Level
Generating levels versus designed levels
Creating a copy of the level piece
Instantiating
Vector3
Testing LevelGenerator
Extending the level
The code used in this chapter
Summary
12. The User Interface Chevron down icon Chevron up icon
12. The User Interface
Introducting the Unity UI
Views
Buttons
Hiding and showing the Canvas
Reference exceptions
GameView
The code in this chapter
Summary
13. Collectables — What Next? Chevron down icon Chevron up icon
13. Collectables — What Next?
Collectables
The coin prefab
High score and persisting data
The Update function and UI values
What next?
The code in this chapter
Summary
Index Chevron down icon Chevron up icon
Index

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This book is perfect for learn Unity 5.X step by step, sometimes the issues are complicated but the author relaxes and gives encouragement to follow.The first part of the book is a brief and brilliant summary of important aspects to consider for both novices and people who know another programming language.In addition to download the code they have no problems, so the study flows to the rhythm you want.In short, you note 150% .... very good job !!!
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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 [email protected] 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 [email protected] 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 [email protected] 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 [email protected] 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 [email protected] 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 [email protected] 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