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 – preparing Canvas for heartbeat visualization


Let's start with simple things by creating a Quick UI project based on the latest version of Qt Quick. Rename the QML file Creator made for us to HeartBeat.qml. Open the qmlproject file that was created with the project and change the mainFile property of the Project object to HeartBeat.qml. Then, you can close the qmlproject document and return to HeartBeat.qml. There, you can replace the original content with the following:

import QtQuick 2.2

Canvas {
  id: canvas

  implicitWidth: 600
  implicitHeight: 300

  onPaint: {
    var ctx = canvas.getContext("2d")
    ctx.clearRect(0, 0, canvas.width, canvas.height)
  }
}

When you run the project, you will see... a blank window.

What just happened?

In the preceding code, we created a basic boilerplate code for using a canvas. First, we renamed the existing file to what we want our component to be called, and then we informed Creator that this document is to be executed when we run...