openFrameworks Essentials by Perevalov, Denis -- Read -- Imperial Library of Trantor

Index

openFrameworks Essentials

Table of Contents openFrameworks Essentials Credits Foreword

The pro goes ashore The era of self-education

About the Authors About the Reviewers www.PacktPub.com

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Preface

What this book covers What you need for this book Who this book is for Conventions Reader feedback Customer support

Downloading the example code Downloading the color images of this book Errata Piracy Questions

1. Getting Started with openFrameworks

What is openFrameworks? Installing openFrameworks

The openFrameworks folder structure

Running your first example The video synthesizer application

Three reasons to create your own video synthesizer with openFrameworks

Summary

2. Creating Your First openFrameworks Project

Creating and running a new project

Creating a project Running a project

Discovering the project's code structure Setting up the screen Centering the coordinate system A simple drawing

Setting drawing color Drawing primitives

Geometric patterns

The stripe pattern

A stripe pattern made from parallel lines

Inserting the function declaration Inserting the function definition Inserting the function calling

A stripe pattern made from rotating lines A stripe pattern made from rotating triangles

Summary

3. Adding a GUI and Handling Keyboard Events

Creating a GUI using the ofxGui addon Implementing a simple GUI panel with sliders

Using the sliders' values

Implementing the autosave feature Creating groups of controls

Using the sliders' values

Implementing a checkbox, a color selector, and a 2D slider

Using the controls' values Experimenting with the project

Handling keyboard events

Hiding the GUI Saving a screenshot Saving a preset using the system save dialog Loading a preset using the system load dialog

Implementing the matrix pattern generator

Using the sliders' values Experimenting with the matrix pattern generator

Summary

4. Working with Raster Graphics – Images, Videos, and Shaders

Raster images in openFrameworks Drawing an image file Playing a video file Grabbing a live video from a camera Mixing layers using additive blending

Creating the mixer's GUI Implementing the mixer's functionality

Creating the video effect with a shader

Redirecting drawing to the offscreen buffer Drawing the offscreen buffer contents and enabling smoothing Implementing the kaleidoscope effect

Creating the fragment shader

How it works

Creating the vertex shader Using created shaders in the project

Summary

5. Creating 3D Graphics

Introduction to 3D graphics with openFrameworks

openFrameworks classes for surface representation

Drawing a wireframe sphere Creating a camera

Controlling the camera with a mouse

Disabling mouse control for the camera when the GUI is visible

Camera automation

Drawing a solid sphere

The things needed for shading the surface Drawing a solid sphere with shading

Texturing the sphere

Preparing a texture Setting texture coordinates Activating texturing

Mixing 2D and 3D with the GUI Deforming a sphere

Deforming by formulas Extruding the sphere

Summary

6. Animating Parameters

Using time values for a parameter's automation

Implementing a simple LFO Implementing a pseudorandom LFO with Perlin noise

Using the level of sound for a parameter's automation

Playing and analyzing an audio file

Getting the level of a sound signal

Capturing sound from a sound card's input and measuring its level Reading data from a text file Controlling automation Summary

7. Distributed and Physical Computing with Networking and Arduino

Distributed computing with networking Networking in openFrameworks

The ofxNetwork addon The ofxOsc addon

Implementing the OSC messages receiver Creating an OSC sender with openFrameworks

Sending OSC messages between two separate computers

Connection troubleshooting

Creating OSC senders with TouchOSC, Python, and Max/MSP

Creating an OSC sender for a mobile device using the TouchOSC app Creating an OSC sender with Python Creating an OSC sender with Max/MSP

Physical computing with Arduino Programming an Arduino board

Receiving data from Arduino in the openFrameworks project

Connection troubleshooting Connecting more devices

Summary

8. Deploying the Project on iOS, Android, and Raspberry Pi

Running the project on an iOS device

Implementing video synthesizer for iOS Building a project for iPad

Deploying the project on an iOS device

Using accelerometer

Running the project on an Android device

Installing software for Android development Implementing video synthesizer for Android

Creating an empty project Implementing the video synthesizer

Increasing the size of the GUI panel

Troubleshooting

Implementing reaction on stopping and double-tapping Using the accelerometer on an Android device Renaming the project

Running the project on Raspberry Pi

Required equipment Setting up the device Installing openFrameworks Running the first example Implementing a video synthesizer for Raspberry Pi

Summary

9. Further Resources

Enhancing the video synthesizer project

Speeding up the rendering Drawing curves and text Using fragment shaders for image generation Using vertex shaders for an object deformation Using the Firmata protocol for Arduino connection Multidisplay setup and sharing images between separate programs

Getting more information on openFrameworks

openFrameworks books

Debugging and speeding up your code

Debugging Speeding up the code

Summary

A. Video Synthesizer Reference

The desktop version

The openFrameworks project and source files

Data files

Control keys The GUI controls

Basic sliders Global group Primitive group Mixer group

iOS and Android versions

The openFrameworks project and source files Data files The GUI Touches Accelerometer

Raspberry Pi version Summary

B. openFrameworks Quick Reference

Application 2D drawing The GUI Multimedia and other classes Mathematical, timer, and conversion functions Summary

Index

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