Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Arrow up icon
GO TO TOP
Game Programming Using Qt Beginner's Guide

You're reading from   Game Programming Using Qt Beginner's Guide A complete guide to designing and building fun games with Qt and Qt Quick 2 using associated toolsets

Arrow left icon
Product type Paperback
Published in Jan 2016
Publisher
ISBN-13 9781782168874
Length 512 pages
Edition 1st Edition
Tools
Arrow right icon
Authors (2):
Arrow left icon
Lorenz Haas Lorenz Haas
Author Profile Icon Lorenz Haas
Lorenz Haas
Witold Wysota Witold Wysota
Author Profile Icon Witold Wysota
Witold Wysota
Arrow right icon
View More author details
Toc

Table of Contents (13) Chapters Close

Preface 1. Introduction to Qt FREE CHAPTER 2. Installation 3. Qt GUI Programming 4. Qt Core Essentials 5. Graphics with Qt 6. Graphics View 7. Networking 8. Scripting 9. Qt Quick Basics 10. Qt Quick A. Pop Quiz Answers Index

Time for action – moving the background


Now the question is how to move them at different speeds. The solution is quite simple: the slowest one, the sky, is the smallest image. The fastest background, the ground and the grass, are the largest images. Now when we have a look at the end of the movePlayer() function's slot we see this:

qreal ff = qMin(1.0, m_skippedMoving/(m_fieldWidth - width()));
m_sky->setPos(-(m_sky->boundingRect().width() - width()) * ff, 0);
m_grass->setPos(-(m_grass->boundingRect().width() - width()) * ff, m_grass->y());
m_trees->setPos(-(m_trees->boundingRect().width() - width()) * ff, m_trees->y());
m_ground->setPos(-(m_ground->boundingRect().width() - width()) * ff, m_ground->y());

What just happened?

What are we doing here? At the beginning, the sky's left border is the same as the view's left border, both at point (0, 0). At the end, when Benjamin has walked to the maximum right, the sky's right border should be the same as the view...

lock icon The rest of the chapter is locked
Register for a free Packt account to unlock a world of extra content!
A free Packt account unlocks extra newsletters, articles, discounted offers, and much more. Start advancing your knowledge today.
Unlock this book and the full library FREE for 7 days
Get unlimited access to 7000+ expert-authored eBooks and videos courses covering every tech area you can think of
Renews at $19.99/month. Cancel anytime
Banner background image