You're reading from Qt5 C++ GUI Programming Cookbook Design and build a functional, appealing, and user-friendly graphical user interface

Product type Paperback

Published in Jul 2016

Publisher Packt

ISBN-13 9781783280278

Length 300 pages

Edition 1st Edition

Languages

C++

Tools

Concepts

GUI Application Development

Author (1):

Lee Zhi Eng

View More author details

Table of Contents (11) Chapters

Preface

1. Look and Feel Customization

2. States and Animations FREE CHAPTER

3. QPainter and 2D Graphics

4. OpenGL Implementation

5. Building a Touch Screen Application with Qt5

6. XML Parsing Made Easy

7. Conversion Library

8. Accessing Databases

9. Developing a Web Application Using Qt Web Engine

Index

Rendering 2D shapes

Since we have already learned how to draw our first rectangle on the screen, we will further enhance it in this section. We will take the previous example and continue from there.

How to do it…

First, go to the paintGL() function in mainwindow.cpp and replace the quad in the previous example with new code. This time, we draw a quad together with a triangle:

void MainWindow::paintGL()
{
  / Initialize clear color (cornflower blue)
  glClearColor(0.39f, 0.58f, 0.93f, 1.f);

  / Clear color buffer
  glClear(GL_COLOR_BUFFER_BIT);

  glBegin(GL_QUADS);
  glVertex2f(-0.5f, -0.5f);
  glVertex2f(0.5f, -0.5f);
  glVertex2f(0.5f, 0.5f);
  glVertex2f(-0.5f, 0.5f);
  glEnd();

  glBegin(GL_QUADS);
    glColor3f(1.f, 0.f, 0.f); glVertex2f(-0.8f, -0.8f);
    glColor3f(1.f, 1.f, 0.f); glVertex2f(0.3f, -0.8f);
    glColor3f(0.f, 1.f, 0.f); glVertex2f(0.3f, 0.3f);
    glColor3f(0.f, 0.f, 1.f); glVertex2f(-0.8f, 0.3f);
  glEnd();

  glBegin(GL_TRIANGLES);
    glColor3f(1.f, 0.f...

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Authors (1)

Lee Zhi Eng

Lee Zhi Eng is a self-taught programmer who worked as an artist and programmer at several game studios before becoming a part-time lecturer for 2 years at a university, teaching game development subjects related to Unity and Unreal Engine. He has not only taken part in various projects related to games, interactive apps, and virtual reality but has also participated in multiple projects that are more oriented toward software and system development. When he is not writing code, he enjoys traveling, photography, and exploring new technologies.

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