Coding Challenge #130: Fourier Transform User Drawing

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Published on January 28, 2019 2:10:15 PM ● Video Link: https://www.youtube.com/watch?v=n9nfTxp_APM

Duration: 9:21

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In this coding challenge, I implement the Discrete Fourier Transform algorithm in JavaScript and render a drawing using epicycles derived from the transform. Code: https://thecodingtrain.com/challenges/130-drawing-with-fourier-transform-and-epicycles

p5.js Web Editor Sketches:
🕹️ Fourier Transform: https://editor.p5js.org/codingtrain/sketches/RfrZibjfL
🕹️ Fourier Transform - user-drawn path: https://editor.p5js.org/codingtrain/sketches/jawHqwfda
🕹️ Fourier Transform - complex numbers: https://editor.p5js.org/codingtrain/sketches/ldBlISrsQ
🕹️ Fourier Transform - user-drawn path with complex numbers: https://editor.p5js.org/codingtrain/sketches/sPvZsg2w4

Other Parts of this Challenge:
📺 Part 1 - Drawing with Fourier Transform and Epicycles : https://youtu.be/MY4luNgGfms
📺 Part 3 - Complex Numbers: https://youtu.be/7_vKzcgpfvU

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References:
🚂 Coding Train Logo: https://twitter.com/TomFevrier/status/1079437780466520065
💾 p5.FFT: https://p5js.org/reference/#/p5.FFT
💾 FFT on Algorithm Archive: https://www.algorithm-archive.org/contents/cooley_tukey/cooley_tukey.html
🗄 Discrete Fourier transform on Wikipedia: https://en.wikipedia.org/wiki/Discrete_Fourier_transform
🗄 Complex Number on Wikipedia: https://en.wikipedia.org/wiki/Complex_number

Videos:
🎥 But what is the Fourier Transform? A visual introduction: https://youtu.be/spUNpyF58BY
🎥 Fourier Analysis For The Rest Of Us: https://youtu.be/2hfoX51f6sg
🎥 Epicycles, complex Fourier series and Homer Simpson's orbit: https://youtu.be/qS4H6PEcCCA
🔴 Code Train Live 165: https://youtu.be/0b3R8oWffkw?t=8241s

Related Coding Challenges:
🚂 #125 Fourier Series: https://youtu.be/Mm2eYfj0SgA

Timestamps:
0:00 Fourier Transform and Epicycles Part 2 - render a user-drawn path
1:20 Create a state variable
2:18 When the mouse is pressed, set the state as "user"
4:18 Render points while the user is drawing
6:48 Reset variables
7:38 Fix offset
8:38 Up next: have the inputs be complex numbers

Editing by Mathieu Blanchette
Animations by Jason Heglund
Music from Epidemic Sound

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🔗 p5.js: https://p5js.org
🔗 p5.js Web Editor: https://editor.p5js.org/
🔗 Processing: https://processing.org

📄 Code of Conduct: https://github.com/CodingTrain/Code-of-Conduct

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#fouriertransformsquarewave #discretefouriertransform #epicyclesdrawing #javascript #p5js