Lee Stemkoski - Java Game Development with LibGDX: From Beginner to Professional [Lingua inglese]

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Part I
Fundamental Concepts

Fundamental Concepts

In the following chapters, you will be introduced to the LibGDX library and build a custom framework on top of this library to simplify creating a variety of games. These chapters are the foundation for the rest of the book; future chapters will assume a working knowledge of the topics presented here.

Chapter : Getting Started with Java and LibGDX

This chapter will explain how to set up BlueJ, a Java development environment that has been chosen for its simplicity and user-friendliness. The standard first program (which prints Hello, World! to the text console) will be explained. Next, instructions for setting up the LibGDX software library will be given, and a visual Hello, World! program will be presented (which displays an image of the world in a window). Finally, some of the benefits of using LibGDX for game development will be explained in detail.

Chapter : The LibGDX Framework

This chapter will begin by discussing the overall structure of a video game program, including the stages that a game program progresses through and the tasks that must be accomplished at each stage. Many of the major features and classes of the LibGDX library will be introduced in the process of creating a basic game called Starfish Collector . This game is a recurring example throughout the book; features will be added to this project when introducing new topics.

Chapter : Extending the Framework

In this chapter, youll start with a core LibGDX class that represents game entities and create an extension of this class to support animation, physics-based movement, improved collision detection, and the ability to manage multiple instances of an entity using lists.

Chapter : Shoot-em-up Games

This chapter will demonstrate the power of the framework you have created by using that framework to make an entirely new game: Space Rocks , a space-themed shoot-em-up game inspired by the classic arcade game Asteroids . Along the way, you will add to the framework, incorporating the ability to handle input for discrete actions such as shooting lasers (in contrast to continuous actions, such as movement).

Chapter : Text and User Interfaces

In this chapter, you will learn how to display text, create buttons that display an image or text, and design a user interface using tables. First, you will be introduced to these skills by adding these features to the Starfish Collector game from Chapter . Then, you will build on and strengthen these skills while learning how to create cutscenes (sometimes called in-game cinematics) that provide a narrative element to your games. In an optional final section, you will create a visual novelstyle game called The Missing Homework , which focuses on a story and allows the player to make decisions about how the story proceeds.

Chapter : Audio

In this chapter, you will learn how to add audio elementssound effects and background musicto your game. First, you will be introduced to these topics by adding these features to the Starfish Collector . Then, in an optional section, you will build on these skills with a musical rhythmbased game called Rhythm Tapper , in which the player presses a sequence of keys indicated visually that are synchronized with music playing in the background.

Lee Stemkoski 2018

Lee Stemkoski Java Game Development with LibGDX

1. Getting Started with Java and LibGDX

Lee Stemkoski 1

(1)

DEPT OF MATH & CS, ADELPHI UNIVERSITY DEPT OF MATH & CS, Garden City, New York, USA

This chapter will explain how to set up a Java development environment and configure it to run with the LibGDX game development framework. Youll see a simple example of a Hello, World! program and explore it in enough detail to understand the different parts. Finally, youll learn some of the advantages to be gained by working with the LibGDX library .

Choosing a Development Environment

Before diving into Java programming, you will need to set up an integrated development environment (IDE) the software you will use for writing, debugging, and compiling code. There are many editors for writing your Java programs, each customized for different skill levels. BlueJ ( www.bluej.org ) and DrJava ( www.drjava.org ) are designed for beginners and educational use and are frequently used in introductory programming courses in schools and colleges. IntelliJ IDEA ( www.jetbrains.com/idea/ ), NetBeans ( netbeans.org ), and Eclipse ( eclipse.org ) are advanced editors that are preferred by practicing professionals. For compiling and running Java code, youll need the Java Development Kit (JDK) , which is available directly from the Oracle Corporation or is bundled directly with some of the editors just listed.

Each editor has advantages and disadvantages. BlueJ and DrJava are user friendly and have simple, minimal user interfaces, but lack some of the advanced editors features, such as autocompletion of fields, methods, and import statements. The advanced editors are faster, feature-packed, more powerful, highly customizable, and replete with various plug-ins, but they also have a steep learning curve and user interfaces that may be more daunting to beginners. Figure illustrates this point with a side-by-side comparison of the Eclipse and BlueJ interfaces. The screenshots and descriptions of the BlueJ software in this chapter are from BlueJ version 4.1.0.

Figure 1-1.

User interfaces for Eclipse (left) and BlueJ (right)

This chapter will cover how to set up BlueJ . I chose this particular IDE because it is quick and easy to set up and configure, which will enable you to start programming games even faster. However, if you are already familiar and comfortable with one of the more advanced editors, of course you should feel free to use it rather than BlueJ. A wealth of informational material is available for setting up Eclipse, NetBeans, and IntelliJ IDEA with LibGDX at the LibGDX wiki ( https://github.com/libgdx/libgdx/wiki ). If you choose to use one of these programs, then after your IDE is set up, skip ahead to the upcoming section Creating a Hello, World! Program for LibGDX.

Setting Up BlueJ

This section will cover how to set up the BlueJ IDE . Since it was designed for beginners, the number of steps is small and the process is straightforward, as you will see.

Downloading and Installing

BlueJ can be downloaded from www.bluej.org .

There are multiple download options available for a variety of operating systems. Furthermore, some of these downloads are bundled with the JDK, and some are not. The JDK includes tools for developing and debugging Java applications; in particular, it is necessary for compiling your code. If you have used your computer to develop Java applications before, you likely already have the JDK installed and can just select the stand-alone BlueJ installer. If you arent sure, you should download and run the BlueJ combined installer.

Using BlueJ

When learning a new programming language or library, it is a well-established tradition in computer science to write a Hello, World! application as a first program. This section will cover the basics of using BlueJ to write this program:

1. Start up the BlueJ software. (The first time you run it, it may prompt you for the location of the directory where the JDK is stored, and it may also ask if you want to participate in helping to improve the software by providing information.)

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