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Lua Game Development Cookbook

You're reading from   Lua Game Development Cookbook Over 70 recipes that will help you master the elements and best practices required to build a modern game engine using Lua

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Product type Paperback
Published in Jul 2015
Publisher
ISBN-13 9781849515504
Length 360 pages
Edition 1st Edition
Languages
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Author (1):
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Mário Kašuba Mário Kašuba
Author Profile Icon Mário Kašuba
Mário Kašuba
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Toc

Table of Contents (11) Chapters Close

Preface 1. Basics of the Game Engine 2. Events FREE CHAPTER 3. Graphics – Common Methods 4. Graphics – Legacy Method with OpenGL 1.x–2.1 5. Graphics – Modern Method with OpenGL 3.0+ 6. The User Interface 7. Physics and Game Mechanics 8. Artificial Intelligence 9. Sounds and Networking Index

Using the keyboard input

LuaSDL offers a simple way of determining what key was pressed or released on your keyboard. Events with event types SDL.SDL_KEYDOWN and SDL.SDL_KEYUP can react to one keystroke at the time. This is usually fine during a game play. However, if you want to use keyboard shortcuts in a text input field, the previous approach would not be very efficient.

This recipe will show you how to manage keyboard input in a robust way that can be used for both situations—to control a game or to write text into an input field.

Getting ready

Let's say you need your game character to run when a Shift key is pressed. There are three key problems. The common PC keyboard has left and right Shift keys. These are two different keys with two different key symbol codes. The next thing is that you use these keys with another keyboard key which may or may not be the modifier key. The last problem is putting key states together, so you'll know if the player has pressed the Shift...

You have been reading a chapter from
Lua Game Development Cookbook
Published in: Jul 2015
Publisher:
ISBN-13: 9781849515504
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