Book Image

Mastering Qt 5

By : Guillaume Lazar, Robin Penea
Book Image

Mastering Qt 5

By: Guillaume Lazar, Robin Penea

Overview of this book

Qt 5.7 is an application development framework that provides a great user experience and develops full-capability applications with Qt Widgets, QML, and even Qt 3D. This book will address challenges in successfully developing cross-platform applications with the Qt framework. Cross-platform development needs a well-organized project. Using this book, you will have a better understanding of the Qt framework and the tools to resolve serious issues such as linking, debugging, and multithreading. Your journey will start with the new Qt 5 features. Then you will explore different platforms and learn to tame them. Every chapter along the way is a logical step that you must take to master Qt. The journey will end in an application that has been tested and is ready to be shipped.
Table of Contents (20 chapters)
Mastering Qt 5
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Preface

Architecting the Mandelbrot project


The example project of this chapter is the multi-threaded calculation of a Mandelbrot fractal. The user will see the fractal and will be able to pan and zoom in that window.

Before diving into the code, we have to have a broad understanding of a fractal and how we are going to achieve its calculation.

The Mandelbrot fractal is a numerical set that works with complex numbers (a + bi). Each pixel is associated with a value calculated through iterations. If this iterated value diverges towards infinity then the pixel is out of the Mandelbrot set. If not, then the pixel is inside the Mandelbrot set. A visual representation of the Mandelbrot fractal looks like this:

Every black pixel in this image tends to diverge to an infinite value, whereas white pixels are bounded to a finite value. The white pixels belong to the Mandelbrot set.

What makes it interesting from a multi-threaded perspective, is that to determine if the pixel belongs or not to the Mandelbrot set...