Book Image

Game Programming Using Qt: Beginner's Guide

By : Lorenz Haas, Witold Wysota, Witold Wysota, Lorenz Haas
Book Image

Game Programming Using Qt: Beginner's Guide

By: Lorenz Haas, Witold Wysota, Witold Wysota, Lorenz Haas

Overview of this book

Qt is the leading cross-platform toolkit for all significant desktop, mobile, and embedded platforms and is becoming more popular by the day, especially on mobile and embedded devices. Despite its simplicity, it's a powerful tool that perfectly fits game developers’ needs. Using Qt and Qt Quick, it is easy to build fun games or shiny user interfaces. You only need to create your game once and deploy it on all major platforms like iOS, Android, and WinRT without changing a single source file. The book begins with a brief introduction to creating an application and preparing a working environment for both desktop and mobile platforms. It then dives deeper into the basics of creating graphical interfaces and Qt core concepts of data processing and display before you try creating a game. As you progress through the chapters, you’ll learn to enrich your games by implementing network connectivity and employing scripting. We then delve into Qt Quick, OpenGL, and various other tools to add game logic, design animation, add game physics, and build astonishing UI for the games. Towards the final chapters, you’ll learn to exploit mobile device features such as accelerators and sensors to build engaging user experiences. If you are planning to learn about Qt and its associated toolsets to build apps and games, this book is a must have.
Table of Contents (18 chapters)
Game Programming Using Qt
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – improving the path of the sun


The task at hand is going to be to improve the animation of the sun so that it behaves in a more realistic way. We will do this by adjusting the animations so that the object moves over a curved path.

In our QML document, replace the previous vertical animation with the following one:

SequentialAnimation {
  NumberAnimation {
    target: sun
    property: "y"
    from: root.height+sunVisual.height
    to: root.height-270
    duration: dayLength/2
    easing.type: Easing.OutCubic
  }
  NumberAnimation {
    target: sun
    property: "y"
    to: root.height+sunVisual.height
    duration: dayLength/2
    easing.type: Easing.InCubic
  }

  running: true
}

What just happened?

The sequence of three animations (two linear ones and a pause) was replaced by another sequence of two animations that follow a path determined by a cubic function. This makes our sun rise pretty fast and then slow down to an amount almost unnoticeable near the moment when the...