Philippe Rivière Fil

Cahill-Keyes map projection (I modified Waterman butterfly projection in the geo.polyhedron D3 plugin to have incisions at 17° (Thanks Jason for the great inspiration!).

Gene Keyes's first 5 principles:

principal format to an M-shape, joined at south Atlantic
principal dividing meridian to 20° W
incisions at equator and poles at 17°
proportionality of geocells
circular parallels for the polar regions

From Wikipedia:

In mathematics, a Fourier series decomposes periodic functions or periodic signals into the sum of a (possibly infinite) set of simple oscillating functions, namely sines and cosines (or complex exponentials).

Use the bottom right form to change the visualized serie.

It seems that Chrome finally found a way to let us convert from svg to canvas to png without the tainted canvas security feature/bug.

See this gist for the full code.

An example of an unambiguous fractal treemap. See this example discussing the unambiguous representation of unordered trees, and also this other example from which the random tree Konanopii (1,724 leaves) has been taken from.

ipython
run gosper_regions_depth.py
gosperify('konanopii_1724.json','/data/_workspace/hexes.wkt.csv','regions','depth.json')
Ctrl+D

###Creating static data visualizations with D3.js and Node.js###

See the accompanying blog post for more details on how to create static data viz using D3.js and Node.js

Re-creates Mike Bostock's area choropleth example for Node.js. Allows for output/creation of a non-interactive SVG via the command line.

Requires Node.js and npm. You will also need D3.js for Node.js, installed via,

npm install d3

Imitate hand-drawn (imperfect) circles using cubic Bézier segments, based on a Bézier approximation to a perfect circle. TLDR: a good approximation to a quarter circle of unit radius is a cubic Bézier curve with control points P₀ = (0,1), P₁ = (c,1), P₂ = (1,c), P₃ = (1,0) where c = 0.551915024494. By varying the points in a sensible way, we can do a good impression of hand-drawn circles.

Please consider using http://lygia.xyz instead of copy/pasting this functions. It expand suport for voronoi, voronoise, fbm, noise, worley, noise, derivatives and much more, through simple file dependencies. Take a look to https://github.com/patriciogonzalezvivo/lygia/tree/main/generative

Generic 1,2,3 Noise

float rand(float n){return fract(sin(n) * 43758.5453123);}

float noise(float p){
	float fl = floor(p);
  float fc = fract(p);

D3js try for elegant map out of OSM data.

	<?php
	/*********************************/
	/* Options de développement */
	/*********************************/

	// Désactiver le cache de SPIP
	// -1: inactif
	// 1: actif
	define('_NO_CACHE', -1);