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

Time for action – making the chess game interactive


We have managed to display the chess board but to actually play a game, we have to tell the program what moves we want to play. We could do that by adding the QLineEdit widget where we would input the move in algebraic form (for example, Nf3 to move a knight to f3), but a more natural way is to click a piece with the mouse cursor (or tap it with a finger) and then click again on the destination field. To obtain such functionality, the first thing to do is to teach ChessView to detect mouse clicks. Therefore, add the following method:

QPoint ChessView::fieldAt(const QPoint &pt) const
{
  if(!m_board) return QPoint();
  const QSize fs = fieldSize();
    int offset = fontMetrics().width('M')+4; // 'M' is the widest letter
    if(pt.x() < offset) return QPoint();
    int c = (pt.x()-offset) / fs.width();
    int r = pt.y()/fs.height();
    if(c < 0 || c >= m_board->columns() || r<0 || r >= m_board->ranks()) 
       ...