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Home > Game Development > Game Design > Haxe Game Development Essentials
Haxe Game Development Essentials
Haxe Game Development Essentials

Haxe Game Development Essentials: Create games on multiple platforms from a single codebase using Haxe and the HaxeFlixel engine

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Haxe Game Development Essentials

Chapter 2. Building a New Game

In this chapter, we're going to start building our game. We'll start by exploring some of the fundamental Haxe syntaxes that we'll be using. After this, we'll make a new HaxeFlixel project, make a few changes, and work on getting some simple gameplay in place that will serve as the base to build on.

Here's a rundown of the sections in this chapter:

  • The Haxe syntax
  • Setting up a new HaxeFlixel project
  • Adding the background and basic UI
  • Making enemies
  • Instantiating enemies and adding interaction
  • Creating the end screen
  • Restarting the level
  • Implementing the game timer

The Haxe syntax

Haxe is a very easy language to learn, so we'll be go over the basic syntax now and build on what we know as the book progresses.

At its core, Haxe contains all of the same things you find in other languages: variables, data types, data structures, access modifiers, functions (also known as methods), and expressions.

Haxe is also an object-oriented language, so you will see classes, inheritance, and polymorphism.

Data types and structures

The basic data types in Haxe are Bool, Float, Int, and so on.

Those data types are considered basic because they are simple pieces of data that aren't represented by a class. There are many data types and structures that are important and are represented by a class. They are explained here.

Operators

Haxe has a number of operators that are used to perform math equations, concatenation, and comparison. Let's go over the most common ones.

Access modifiers

Variables, classes, and functions can all be given an access modifier to determine...

Setting up a new HaxeFlixel project

Now that we've gone over the basics of the Haxe language, we'll start working on the foundation of our game. The game we're going to make is a side scrolling space shooter similar to games like R-Type or Gradius. It will be much simpler than those games, but by the end of this book you will have the skills you need to take the game to that level of complexity.

To keep the game fun, we'll add a goofy twist: you'll control a walrus with a raygun and a jetpack, and your enemies will be rocket-powered space cats. We'll name this game Star Walrus!

To start, we're going to keep it simple and have enemies that spawn in that you click on to increase your score until a timer runs out. This will help with learning the fundamentals.

Creating the new project

Like in our Hello World example, we'll start by making a new project using the command line. So, open up a command or terminal window, navigate to the folder that you want...

Adding a background and basic UI

We're going to start by adding a background, and two text fields to display the score and game time to the player. Open up PlayState.hx, and we'll add some variables.

Inside the class, add the following variables:

private var background:FlxSprite;
private var txtScore:FlxText;
private var txtTime:FlxText;

The background is a FlxSprite object. It is used when you want to display an art asset or a shape drawn by HaxeFlixel. The txtScore and txtTime variables are FlxText objects, and as the name implies, they're used to display text.

After this, go inside the create function and add the following underneath super.create():

background = new FlxSprite();
background.loadGraphic(AssetPaths.gameBackground__png);
add(background);

In those lines, we are creating a new FlxSprite instance in the background variable, loading our background image using the AssetPaths class, and then using the add function to add the background to PlayState. The add function is...

Making enemies

Next, we'll start making our enemies, and then we'll add them to the screen. To do this, we'll make a new class that will handle displaying our enemies. They will appear at random places on the screen after random time intervals.

Creating the enemy class

If you're using FlashDevelop, you can create a class by right-clicking on the source folder and going to Add | New Class. Then, name it Enemy and set its base class to FlxSprite.

If you're using Sublime Text, you can make a new class by going to File | New File and saving the file under the source folder as Enemy.hx.

FlashDevelop will create part of the class for you. In Sublime Text, you'll have to add most of the class by hand. For FlashDevelop, remove source from the package section. We're not going to use packages for classes that sit directly under the source folder.

Your class should look like this:

package;

import flixel.util.FlxTimer;
import flixel.FlxSprite;
import AssetPaths;

class...

Instantiating enemies and adding interaction

Next, we'll go back to PlayState and create instances of our enemies, and then make enemies disappear when they're clicked. Finally, we'll then add to our score every time the player clicks on an enemy.

Adding new imports

Before adding functionality, we'll need to import some more classes we'll be using in PlayState:

import flixel.plugin.MouseEventManager;
import flixel.FlxObject;
import flixel.util.FlxTimer;

Adding variables

Next, we'll add the new variables we'll need to track:

  private var numEnemies:Int = 20;
  private var score:Int = 0;
  private var enemyPointValue:Int = 155;
  private var enemies:Array<Enemy>;

These variables are pretty straightforward: numEnemies is the number of enemies we'll spawn in the game, score is the player's current score, and enemyPointValue is the number of points that will be added to your score each time an enemy is clicked. Finally, enemies is an array that will...

The Haxe syntax

Haxe is a very easy language to learn, so we'll be go over the basic syntax now and build on what we know as the book progresses.

At its core, Haxe contains all of the same things you find in other languages: variables, data types, data structures, access modifiers, functions (also known as methods), and expressions.

Haxe is also an object-oriented language, so you will see classes, inheritance, and polymorphism.

Data types and structures

The basic data types in Haxe are Bool, Float, Int, and so on.

Those data types are considered basic because they are simple pieces of data that aren't represented by a class. There are many data types and structures that are important and are represented by a class. They are explained here.

Operators

Haxe has a number of operators that are used to perform math equations, concatenation, and comparison. Let's go over the most common ones.

Access modifiers

Variables, classes, and functions can all be given an access modifier to determine how they can...

Setting up a new HaxeFlixel project

Now that we've gone over the basics of the Haxe language, we'll start working on the foundation of our game. The game we're going to make is a side scrolling space shooter similar to games like R-Type or Gradius. It will be much simpler than those games, but by the end of this book you will have the skills you need to take the game to that level of complexity.

To keep the game fun, we'll add a goofy twist: you'll control a walrus with a raygun and a jetpack, and your enemies will be rocket-powered space cats. We'll name this game Star Walrus!

To start, we're going to keep it simple and have enemies that spawn in that you click on to increase your score until a timer runs out. This will help with learning the fundamentals.

Creating the new project

Like in our Hello World example, we'll start by making a new project using the command line. So, open up a command or terminal window, navigate to the folder that you want game's folder to be in, and type in this...

Adding a background and basic UI

We're going to start by adding a background, and two text fields to display the score and game time to the player. Open up PlayState.hx, and we'll add some variables.

Inside the class, add the following variables:

private var background:FlxSprite;
private var txtScore:FlxText;
private var txtTime:FlxText;

The background is a FlxSprite object. It is used when you want to display an art asset or a shape drawn by HaxeFlixel. The txtScore and txtTime variables are FlxText objects, and as the name implies, they're used to display text.

After this, go inside the create function and add the following underneath super.create():

background = new FlxSprite();
background.loadGraphic(AssetPaths.gameBackground__png);
add(background);

In those lines, we are creating a new FlxSprite instance in the background variable, loading our background image using the AssetPaths class, and then using the add function to add the background to PlayState. The add function is inherited from...

Making enemies

Next, we'll start making our enemies, and then we'll add them to the screen. To do this, we'll make a new class that will handle displaying our enemies. They will appear at random places on the screen after random time intervals.

Creating the enemy class

If you're using FlashDevelop, you can create a class by right-clicking on the source folder and going to Add | New Class. Then, name it Enemy and set its base class to FlxSprite.

If you're using Sublime Text, you can make a new class by going to File | New File and saving the file under the source folder as Enemy.hx.

FlashDevelop will create part of the class for you. In Sublime Text, you'll have to add most of the class by hand. For FlashDevelop, remove source from the package section. We're not going to use packages for classes that sit directly under the source folder.

Your class should look like this:

package;

import flixel.util.FlxTimer;
import flixel.FlxSprite;
import AssetPaths;

class Enemy extends FlxSprite
{

  public...
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Page 1 of 10

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Key benefits

  • Learn the modern, cross-platform language Haxe to build games without any trouble
  • Create engaging 2D games that are compatible with desktop, web, and mobile platforms
  • Learn how to speed up your workflow with OpenFL and HaxeFlixel using this useful and compact guide

Description

Haxe is a powerful and high-level multi-platform language that's incredibly easy to learn. Used by thousands of developers and many high-profile companies, Haxe is quickly emerging as a forerunner in the area of cross-platform programming. OpenFL builds on top of Haxe to make developing for multiple platforms quick and painless. HaxeFlixel provides you with the tools you need to build amazing 2D games easier than ever before. Cross-platform development has been supercharged using the Haxe programming language, making it increasingly easy and hassle-free to develop multi-platform games. If you've programmed games before and want to learn out how to deliver games across multiple platforms, or develop games faster, then Haxe Game Development Essentials is the book for you. It starts by showing you how to set up your development environment, then running you through some Haxe language fundamentals, and finally taking you through the process of programming a game from start to finish. You will learn how to create a side scrolling shooter game using HaxeFlixel. Next you will learn to enhance the game with new gameplay features, user interfaces, animations, sound, and configuration files to make your game expandable. Once your game is built and ready, you will learn how to deploy it to web, Android, iOS, and desktop systems. By the end of this book, you will be confident about creating multi-platform games using Haxe, OpenFL, and HaxeFlixel in a faster and easier way.

Who is this book for?

This book is for game developers with some experience programming games on one or more platforms already. If you want to leverage your game development experience on one platform to develop for multiple platforms and to get up and running quickly, this book is for you. Having prior experience with a language similar to Haxe, such as ActionScript or JavaScript will help, but isn't required.

What you will learn

  • Understand the fundamentals of the Haxe programming language
  • Set up a development environment that will work on Windows, Mac, and Linux
  • Create fun 2D games using OpenFL and HaxeFlixel
  • Understand how to implement a user interface
  • Enhance the gameplay experience with cool animations
  • Improve immersion by adding sound
  • Make your game modular and easily expandable using configuration files
  • Compile games that will work on desktop, web, and mobile platforms

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Nov 26, 2015
Length: 188 pages
Edition : 1st
Language : English
ISBN-13 : 9781785289781
Category :
Game Development
Concepts :
Game Design

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Product Details

Publication date : Nov 26, 2015
Length: 188 pages
Edition : 1st
Language : English
ISBN-13 : 9781785289781
Category :
Game Development
Concepts :
Game Design

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Table of Contents

9 Chapters
1. Getting Started Chevron down icon Chevron up icon
1. Getting Started
What's Haxe?
Installation
Setting up target platforms
Hello World
Summary
2. Building a New Game Chevron down icon Chevron up icon
2. Building a New Game
The Haxe syntax
Setting up a new HaxeFlixel project
Adding a background and basic UI
Making enemies
Instantiating enemies and adding interaction
Creating the end screen
Restarting the level
Implementing the game timer
Summary
3. Dealing with Menus and Screen Flow Chevron down icon Chevron up icon
3. Dealing with Menus and Screen Flow
Adding new assets
Building the splash screen
Updating the level end screen
Creating the new game HUD
Adding the new game HUD
Summary
4. Delving into Animations and Gameplay Chevron down icon Chevron up icon
4. Delving into Animations and Gameplay
Object pooling
Project updates
Creating the explosion effects
Making muzzle flashes
Updating enemies
Creating projectiles
Making the player character
Setting health on the HUD
Adding everything to PlayState
Summary
5. Adding Sound Chevron down icon Chevron up icon
5. Adding Sound
Project updates
Creating sound constants
Building the sound manager class
Adding music
Adding menu sounds
Adding gameplay sounds
Summary
6. Working with Configuration Files Chevron down icon Chevron up icon
6. Working with Configuration Files
JSON versus XML
Project updates
Understanding the JSON configuration file
Building the enemy spawner
Spawning enemies
Adding movement patterns to enemies
Updating PlayState
Understanding the XML file
Pulling string data from XML
Replacing strings
Updating LevelEndScreen
Summary
7. Deploying to Multiple Platforms Chevron down icon Chevron up icon
7. Deploying to Multiple Platforms
Building for Flash
Building for Windows
Building for OS X
Building for Android
Building for iOS
Summary
8. What's Next? Chevron down icon Chevron up icon
8. What's Next?
Expanding the game
Exploring advanced features
Continuing on with learning resources
Summary
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.5
(2 Ratings)
5 star 0%
4 star 50%
3 star 50%
2 star 0%
1 star 0%
Shingo Feb 25, 2016
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
It was useful... was hoping for a bit more content, but the title only claimed to have the essentials so no complaint there.May have been better if it briefly covered some of those often sought game dev topics, such as... how one might implement an Isometric view or do Ray Casting... but again, not really the scope of the book I suppose.The mere fact that this is about the only up-to-date game development book targeting HaXe makes it really valueable.
Amazon Verified review Amazon
Richard C. Walter Mar 09, 2016
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Well, after much thought I pulled the trigger and bought this book. I had been learning Haxe and Flixel for the past few months prior to buying it thinking it might shed some light on some best practices, etc. In summary, it's an OK book for the absolute beginner, and all of the material found in the book is easily accessible online in blogs and official demos, etc. so when a book like this comes out, I would expect to find some gems and deeper developer insight. It did present the material in a clear fashion however, and I used it for some of the object recycling tasks I was implementing. But overall, I won't really touch this book again, and now that HaxeFlixel 4.x is out, this book is largely obsolete (because of the major refactoring they have done).
Amazon Verified review Amazon

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About the author

Profile icon Jeremy McCurdy
Jeremy McCurdy
Jeremy McCurdy is a game developer who has been making games using ActionScript, C#, and Haxe for over four years. He has developed games targeted at iOS, Android, Windows, OS X, Flash, and HTML5. He has worked on games that have had millions of gameplay sessions, and has built games for many major North American television networks. He is the games technical lead at REDspace, an award-winning interactive studio that has worked for some of the world's largest brands. They are located in Nova Scotia, Canada, and have been building awesome experiences for 15 years.
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Credits can be earned from reading 40 section of any title within the payment cycle - a month starting from the day of subscription payment. You also earn a Credit every month if you subscribe to our annual or 18 month plans. Credits can be used to buy books DRM free, the same way that you would pay for a book. Your credits can be found in the subscription homepage - subscription.packtpub.com - clicking on ‘the my’ library dropdown and selecting ‘credits’.

What happens if an Early Access Course is cancelled? Chevron down icon Chevron up icon

Projects are rarely cancelled, but sometimes it's unavoidable. If an Early Access course is cancelled or excessively delayed, you can exchange your purchase for another course. For further details, please contact us here.

Where can I send feedback about an Early Access title? Chevron down icon Chevron up icon

If you have any feedback about the product you're reading, or Early Access in general, then please fill out a contact form here and we'll make sure the feedback gets to the right team. 

Can I download the code files for Early Access titles? Chevron down icon Chevron up icon

We try to ensure that all books in Early Access have code available to use, download, and fork on GitHub. This helps us be more agile in the development of the book, and helps keep the often changing code base of new versions and new technologies as up to date as possible. Unfortunately, however, there will be rare cases when it is not possible for us to have downloadable code samples available until publication.

When we publish the book, the code files will also be available to download from the Packt website.

How accurate is the publication date? Chevron down icon Chevron up icon

The publication date is as accurate as we can be at any point in the project. Unfortunately, delays can happen. Often those delays are out of our control, such as changes to the technology code base or delays in the tech release. We do our best to give you an accurate estimate of the publication date at any given time, and as more chapters are delivered, the more accurate the delivery date will become.

How will I know when new chapters are ready? Chevron down icon Chevron up icon

We'll let you know every time there has been an update to a course that you've bought in Early Access. You'll get an email to let you know there has been a new chapter, or a change to a previous chapter. The new chapters are automatically added to your account, so you can also check back there any time you're ready and download or read them online.

I am a Packt subscriber, do I get Early Access? Chevron down icon Chevron up icon

Yes, all Early Access content is fully available through your subscription. You will need to have a paid for or active trial subscription in order to access all titles.

How is Early Access delivered? Chevron down icon Chevron up icon

Early Access is currently only available as a PDF or through our online reader. As we make changes or add new chapters, the files in your Packt account will be updated so you can download them again or view them online immediately.

How do I buy Early Access content? Chevron down icon Chevron up icon

Early Access is a way of us getting our content to you quicker, but the method of buying the Early Access course is still the same. Just find the course you want to buy, go through the check-out steps, and you’ll get a confirmation email from us with information and a link to the relevant Early Access courses.

What is Early Access? Chevron down icon Chevron up icon

Keeping up to date with the latest technology is difficult; new versions, new frameworks, new techniques. This feature gives you a head-start to our content, as it's being created. With Early Access you'll receive each chapter as it's written, and get regular updates throughout the product's development, as well as the final course as soon as it's ready.We created Early Access as a means of giving you the information you need, as soon as it's available. As we go through the process of developing a course, 99% of it can be ready but we can't publish until that last 1% falls in to place. Early Access helps to unlock the potential of our content early, to help you start your learning when you need it most. You not only get access to every chapter as it's delivered, edited, and updated, but you'll also get the finalized, DRM-free product to download in any format you want when it's published. As a member of Packt, you'll also be eligible for our exclusive offers, including a free course every day, and discounts on new and popular titles.