Coding Challenge 181: Weighted Voronoi Stippling

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Published on February 22, 2024 2:51:52 PM ● Video Link: https://www.youtube.com/watch?v=Bxdt6T_1qgc

Duration: 28:59

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Stippling is an artistic technique that uses numerous dots to craft an image. In this coding challenge I attempt to implement a weighted Voronoi stippling algorithm with p5.js along with the Delaunay triangulation package from d3.js. Code: https://thecodingtrain.com/challenges/181-image-stippling

🚀 Watch this video ad-free on Nebula https://nebula.tv/videos/codingtrain-coding-challenge-181-weighted-voronoi-stippling

p5.js Web Editor Sketches:
🕹️ Weighted Voronoi Stippling: https://editor.p5js.org/codingtrain/sketches/Z_YV25_4G
🕹️ Circumcircle: https://editor.p5js.org/codingtrain/sketches/eJnSI84Tw
🕹️ Delaunay Triangulation: https://editor.p5js.org/codingtrain/sketches/fuQz_-FnA
🕹️ Voronoi Diagram: https://editor.p5js.org/codingtrain/sketches/GpeT1W8X1
🕹️ Voronoi Phyllotaxis: https://editor.p5js.org/codingtrain/sketches/ydiZeUK8R
🕹️ Voronoi Diagram colored by area: https://editor.p5js.org/codingtrain/sketches/opmU_UQqg
🕹️ Lloyd's relaxation: https://editor.p5js.org/codingtrain/sketches/04sgsAcNu
🕹️ Weighted Stippling - Size and Color: https://editor.p5js.org/codingtrain/sketches/_HTZUBPld
🕹️ Weighted Stippling - Abstract Pattern: https://editor.p5js.org/codingtrain/sketches/9ntWWLXqA
🕹️ Weighted Stippling - Video: https://editor.p5js.org/codingtrain/sketches/7TKSgi16z

🎥 Previous: https://youtu.be/L4u7Zy_b868?list=PLRqwX-V7Uu6ZiZxtDDRCi6uhfTH4FilpH
🎥 All: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6ZiZxtDDRCi6uhfTH4FilpH

References:
🔗 d3-delaunay: https://d3js.org/d3-delaunay
🔗 Weighted Voronoi Stippling: https://www.cs.ubc.ca/labs/imager/tr/2002/secord2002b/secord.2002b.pdf
🔗 Sweep Line Algorithm: https://en.wikipedia.org/wiki/Sweep_line_algorithm
🔗 Lloyd's algorithm: https://en.wikipedia.org/wiki/Lloyd%27s_algorithm
🔗 Polygons and meshes by Paul Bourke: https://paulbourke.net/geometry/polygonmesh/
🎨 Pablo Jurado Ruiz: https://www.instagram.com/pablojuradoruiz/
🔗 Stippling: https://en.wikipedia.org/wiki/Stippling
🔗 Voronoi Diagram: https://en.wikipedia.org/wiki/Voronoi_diagram
🔗 Delaunay Triangulation: https://en.wikipedia.org/wiki/Delaunay_triangulation
🔗 Mike Bostock's Voronoi Stippling: https://observablehq.com/@mbostock/voronoi-stippling

Videos:
🚂 Pixel Array: https://youtu.be/nMUMZ5YRxHI

Related Coding Challenges:
🚂 C4 Worley Noise: https://youtu.be/4066MndcyCk
🚂 33 Poisson-disc Sampling: https://youtu.be/flQgnCUxHlw

Timestamps:
0:00 Hello!
0:37 What is a Delaunay triangulation?
2:31 d3-delaunay package
2:49 Coding the delaunay triangulation.
6:38 What is a Voronoi diagram?
9:17 voronoi function on the delaunay object
10:25 Things you could try with the Voronoi diagram
10:56 Lloyd's "relaxation" algorithm
12:07 Calculate the average of a polygon's vertices
15:30 Calculate the area of a polygon
16:45 Calculate the proper centroid of a polygon
18:47 What is stippling?
19:45 Draw dots based on brightness value of pixel
21:50 Calculate a weighted centroid
24:51 Using delaunay.find()
27:52 Ideas for you to try!
28:47 Goodbye!

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/
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#delaunaytriangulation #imagestippling #voronoi #sweepalgorithm #lloydsalgorithm #p5js #javascript