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Processing 2: Creative Programming Cookbook

You're reading from   Processing 2: Creative Programming Cookbook

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Product type Paperback
Published in Sep 2012
Publisher Packt
ISBN-13 9781849517942
Length 306 pages
Edition 1st Edition
Languages
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Toc

Table of Contents (18) Chapters Close

Processing 2: Creative Programming Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started with Processing 2 FREE CHAPTER 2. Drawing Text, Curves, and Shapes in 2D 3. Drawing in 3D–Lights, Camera, and Action! 4. Working with Data 5. Exporting from Processing 6. Working with Video 7. Audio Visualization 8. Exploring Computer Vision 9. Exploring JavaScript Mode 10. Exploring Android Mode 11. Using Processing with Other Editors Index

Using Fast Fourier Transforms


Fast Fourier Transforms (FFT) are used to visualize the frequency spectrum of an audio file. The Minim library has a class that handles the math for you, so you can focus on drawing the spectrum. If you want to learn more about Fast Fourier Transforms, you should read this paper by Paul Bour ke, available at http://paulbourke.net/miscellaneous/dft/. While you are on his website, check out the rest of the things Paul has done. You'll find some really amazing geometry algorithms.

How to do it...

The first part of this sketch is similar to the previous ones; the only thing we'll add is an FFT object with the same buffer size and sample rate as the song we'll load.

import ddf.minim.*;
import ddf.minim.signals.*;
import ddf.minim.analysis.*;
import ddf.minim.effects.*;
  
Minim minim;
AudioPlayer player;
FFT fft;
  
void setup()
{
  size( 1024, 480 );
    
  minim = new Minim( this );
  
  player = minim.loadFile("song.mp3", 512 );
  player.loop();
    
  fft = new...
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