Book Image

Qt5 C++ GUI Programming Cookbook

By : Lee Zhi Eng
Book Image

Qt5 C++ GUI Programming Cookbook

By: Lee Zhi Eng

Overview of this book

With the advancement of computer technology, the software market is exploding with tons of software choices for the user, making their expectations higher in terms of functionality and the look and feel of the application. Therefore, improving the visual quality of your application is vital in order to overcome the market competition and stand out from the crowd. This book will teach you how to develop functional and appealing software using Qt5 through multiple projects that are interesting and fun. This book covers a variety of topics such as look-and-feel customization, GUI animation, graphics rendering, implementing Google Maps, and more. You will learn tons of useful information, and enjoy the process of working on the creative projects provided in this book
Table of Contents (16 chapters)
Qt5 C++ GUI Programming Cookbook
About the Author
About the Reviewer

Drawing basic shapes on screen

In this section, we will learn how to draw simple vector shapes (line, rectangle, circle, and so on) and display text on the main window using the QPainter class. We will also learn how to change the drawing style of the vector shapes using the QPen class.

How to do it…

First, let's create a new Qt Widgets Application project:

  1. Open up mainwindow.ui and remove the menu bar, main tool bar, and status bar so that we get a clean, empty main window. Right-click on the bar widgets and select Remove Menu Bar from the pop-up menu:

  2. Then, open up mainwindow.h and add the following code to include the QPainter header file:

    #include <QMainWindow>
    #include <QPainter>
  3. Then, declare the paintEvent() event handler below the class destructor:

    explicit MainWindow(QWidget *parent = 0);
    virtual void paintEvent(QPaintEvent *event);
  4. Next, open up mainwindow.cpp and define the paintEvent() event handler:

    void MainWindow::paintEvent(QPaintEvent *event...