You're reading from Qt 6 C++ GUI Programming Cookbook Practical recipes for building cross-platform GUI applications, widgets, and animations with Qt 6

Product type Paperback

Published in Apr 2024

Publisher Packt

ISBN-13 9781805122630

Length 428 pages

Edition 3rd Edition

Languages

C++

Tools

Concepts

GUI Application Development

Author (1):

Eng

Preface

1. Chapter 1: Look-and-Feel Customization with Qt Designer FREE CHAPTER

2. Chapter 2: Event Handling – Signals and Slots

3. Chapter 3: States and Animations with Qt and QML

4. Chapter 4: QPainter and 2D Graphics

5. Chapter 5: OpenGL Implementation

6. Chapter 6: Transitioning from Qt 5 to Qt 6

7. Chapter 7: Using Network and Managing Large Documents

8. Chapter 8: Threading Basics –Asynchronous Programming

9. Chapter 9: Building a Touch Screen Application with Qt 6

10. Chapter 10: JSON Parsing Made Easy

11. Chapter 11: Conversion Library

12. Chapter 12: Accessing Databases with SQL Driver and Qt

13. Chapter 13: Developing Web Applications Using Qt WebEngine

14. Chapter 14: Performance Optimization

15. Index

16. Other Books You May Enjoy

Coordinate transformation

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

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

First, create a new Qt Widgets Application project. Then, open up mainwindow.ui and remove the menuBar, mainToolBar, and statusBar as we did before.
After that, open up the mainwindow.h file and include the following headers:
```
#include <QTime>
#include <QTimer>
#include <QPainter>
```

Then, declare the paintEvent() function, like so:

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    virtual void paintEvent(QPaintEvent *event);

In the mainwindow.cpp file, 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...
```