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

Coordinate transformation

In this example, we will learn how to use coordinate transformation and a timer to create a real-time clock display.

How to do it…

To create our first graphical clock display, let's follow these steps:

  1. First, create a new Qt Widgets Application project. Then, open up mainwindow.ui and remove the menu bar, tool bar, and status bar.

  2. After that, open up mainwindow.h and include the following headers:

    #include <QTime>
    #include <QTimer>
    #include <QPainter>
  3. Then, declare the paintEvent() function, like so:

      explicit MainWindow(QWidget *parent = 0);
    virtual void paintEvent(QPaintEvent *event);
  4. In mainwindow.cpp, create three arrays to store the shapes of the hour hand, minute hand, and second hand, where each of the arrays contains three sets of coordinates:

    void MainWindow::paintEvent(QPaintEvent *event)
      static const QPoint hourHand[3] =
        QPoint(4, 4),
        QPoint(-4, 4),
        QPoint(0, -40)
      static const QPoint minuteHand...