Book Image

Mastering openFrameworks: Creative Coding Demystified

By : Denis Perevalov
Book Image

Mastering openFrameworks: Creative Coding Demystified

By: Denis Perevalov

Overview of this book

openFrameworks is a powerful programming toolkit and library designed to assist the creative process through simplicity and intuitiveness. It's a very handy software library written in C++ to reduce the software development process, helping you to kick-start creative coding. With the help of C++ and shaders support, openFrameworks allows for the processing of all kinds of media information with your custom-developed algorithms at the lowest possible level, with the fastest speed. "Mastering openFrameworks: Creative Coding Demystified" will introduce you to a world of creative coding projects, including interactive installations, audio-visual, and sound art projects. You will learn how to make your own projects using openFrameworks. This book focuses on low-level data processing, which allows you to create really unique and cutting-edge installations and projects. "Mastering openFrameworks: Creative Coding Demystified" provides a complete introduction to openFrameworks, including installation, core capabilities, and addons. Advanced topics like shaders, computer vision, and depth cameras are also covered. We start off by discussing the basic topics such as image and video loading, rendering and processing, playing sound samples, and synthesizing new sounds. We then move on to cover 3D graphics, computer vision, and depth cameras. You will also learn a number of advanced topics such as video mapping, interactive floors and walls, video morphing, networking, and using geometry shaders. You will learn everything you need to know in order to create your own projects; create projects of all levels, ranging from simple creative-code experiments, to big interactive systems consisting of a number of computers, depth cameras, and projectors.
Table of Contents (22 chapters)
Mastering openFrameworks: Creative Coding Demystified
About the Author
About the Reviewers

The background color of the screen

The drawing on the screen in openFrameworks should be performed in the testApp::draw() function (see the testApp.cpp section in Chapter 1, openFrameworks Basics). Before this function is called by openFrameworks, the entire screen is filled with a fixed color, which is set by the function ofSetBackground( r, g, b ). Here r, g, and b are integer values corresponding to red, green, and blue components of the background color in the range 0 to 255. Note that each of the ofSetBackground() function call fills the screen with the specified color immediately.


You can make a gradient background using the ofBackgroundGradient() function. See its description in the The triangles cloud example section in Chapter 7, Drawing in 3D.

You can set the background color just once in the testApp::setup() function, but we often call ofSetBackground() in the beginning of the testApp::draw() function to not mix up the setup stage and the drawing stage.

Pulsating background example...