Book Image

Unreal Development Kit Game Programming with UnrealScript: Beginner's Guide

By : Rachel Cordone
Book Image

Unreal Development Kit Game Programming with UnrealScript: Beginner's Guide

By: Rachel Cordone

Overview of this book

Unreal Development Kit is the free edition of Unreal Engine—the largest game engine in existence with hundreds of shipped commercial titles. The Unreal Engine is a very powerful tool for game development but with something so complex it's hard to know where to start.This book will teach you how to use the UnrealScript language to create your own games with the Unreal Development Kit by using an example game that you can create and play for yourself. It breaks down the UnrealScript language into easy to follow chapters that will quickly bring you up to speed with UnrealScript game programming.Unreal Development Kit Game Programming with UnrealScript takes you through the UnrealScript language for the Unreal Development Kit. It starts by walking through a project setup and setting up programs to write and browse code. It then takes you through using variables, functions, and custom classes to alter the game's behavior and create our own functionality. The use and creation of Kismet is also covered. Later, using replication to create and test multiplayer games is discussed. The book closes with code optimization and error handling as well as a few of the less common but useful features of UnrealScript.
Table of Contents (18 chapters)
Unreal Development Kit Game Programming with UnrealScript
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – Using arrays


  1. Change our variable declaration line to this:

    var int Baskets[4];

    This will create an array of four baskets. That's easy enough, but how do we change their values?

  2. In our PostBeginPlay function, add these lines:

    Baskets[0] = 2;
    Baskets[1] = 13;
    Baskets[2] = 4;
    Baskets[3] = 1;

    One important thing to remember about arrays is that they start at 0. Even though we have 4 elements in our array, since it starts at 0 it only goes up to 3. If we tried to add a line like this to our function:

    Baskets[4] = 7;

    We would get an error.

  3. Let's go ahead and add the line to see what happens. It will compile just fine, but when we test it in the game we will see the error in the log file:

    [0007.53] ScriptWarning: Accessed array 'AwesomeActor_0.Baskets' out of bounds (4/4)
       AwesomeActor UEDPCAwesomeMap.TheWorld:PersistentLevel.AwesomeActor_0
       Function AwesomeGame.AwesomeActor:PostBeginPlay:0046

    The out of bounds error lets us know that we tried to access an element of the array that...