Book Image

Mastering Qt 5 - Second Edition

By : Guillaume Lazar, Robin Penea
Book Image

Mastering Qt 5 - Second Edition

By: Guillaume Lazar, Robin Penea

Overview of this book

Qt 5.11 is an app development framework that provides a great user experience and develops full capability applications with Qt Widgets, QML, and even Qt 3D. Whether you're building GUI prototypes or fully-fledged cross-platform GUI applications with a native look and feel, Mastering Qt 5 is your fastest, easiest, and most powerful solution. This book addresses various challenges and teaches you to successfully develop cross-platform applications using the Qt framework, with the help of well-organized projects. Working through this book, you will gain a better understanding of the Qt framework, as well as the tools required to resolve serious issues, such as linking, debugging, and multithreading. You'll start off your journey by discovering the new Qt 5.11 features, soon followed by exploring different platforms and learning to tame them. In addition to this, you'll interact with a gamepad using Qt Gamepad. Each chapter is a logical step for you to complete in order to master Qt. By the end of this book, you'll have created an application that has been tested and is ready to be shipped.
Table of Contents (16 chapters)

Defining a Job class with QRunnable

Let's dive into the project's core. To speed up the Mandelbrot picture-generation, we will split the whole computation into multiple jobs. A Job is a request of a specific task. Depending the number of your CPU cores, several jobs will be executed simultaneously. A Job class produces a JobResult function that contains result values. In our project, a Job class generates values for one line of the complete picture. For example, an image resolution of 800 x 600 requires 600 jobs, each one generating 800 values.

Create a C++ header file called JobResult.h:

#include <QSize> 
#include <QVector> 
#include <QPointF>
#include <QMetaType> struct JobResult { JobResult(int valueCount = 1) : areaSize(0, 0), pixelPositionY(0), moveOffset(0, 0), scaleFactor(0.0), values...