Book Image

Game Programming Using Qt: Beginner's Guide

By : Lorenz Haas, Witold Wysota, Witold Wysota, Lorenz Haas
Book Image

Game Programming Using Qt: Beginner's Guide

By: Lorenz Haas, Witold Wysota, Witold Wysota, Lorenz Haas

Overview of this book

Qt is the leading cross-platform toolkit for all significant desktop, mobile, and embedded platforms and is becoming more popular by the day, especially on mobile and embedded devices. Despite its simplicity, it's a powerful tool that perfectly fits game developers’ needs. Using Qt and Qt Quick, it is easy to build fun games or shiny user interfaces. You only need to create your game once and deploy it on all major platforms like iOS, Android, and WinRT without changing a single source file. The book begins with a brief introduction to creating an application and preparing a working environment for both desktop and mobile platforms. It then dives deeper into the basics of creating graphical interfaces and Qt core concepts of data processing and display before you try creating a game. As you progress through the chapters, you’ll learn to enrich your games by implementing network connectivity and employing scripting. We then delve into Qt Quick, OpenGL, and various other tools to add game logic, design animation, add game physics, and build astonishing UI for the games. Towards the final chapters, you’ll learn to exploit mobile device features such as accelerators and sensors to build engaging user experiences. If you are planning to learn about Qt and its associated toolsets to build apps and games, this book is a must have.
Table of Contents (18 chapters)
Game Programming Using Qt
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Using UDP


In contrast to TCP, UDP is unreliable and connectionless. Neither the order of packets, nor their delivery is guaranteed. UDP, however, is very fast. So, if you have frequent data, which does not necessarily need to be received by the peer, use UDP. This data could, for example, be real-time positions of a player that get updated frequently or live video/audio streaming. Since QUdpSocket is mostly the same as QTcpSocket—both inherit QAbstractSocket—there is not much to explain. The main difference between them is that TCP is stream-orientated, whereas UDP is datagram-orientated. This means that the data is sent in small packages, containing among the actual content, the sender's as well as the receiver's IP address and port number. Due to the lack of QUdpServer, you have to use QAbstractSocket::bind() instead of QTcpServer::listen(). Like listen(), bind() takes the addresses and ports that are allowed to send datagrams as arguments. Whenever a new package arrives, the QIODevice...