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TILE_SIZE = 256.0
PX_TO_COORD = 1.0 / TILE_SIZE
RAD_2_DEG = 180.0 / Math::PI
DEG_2_RAD = Math::PI / 180.0
TWO_PI = Math::PI * 2.0
MAX_ZOOM = 20

module TileMaps
  def lng_lat_to_mercator(lng, lat)
    # turn degrees into radians

RandomEtc

var data = [ ],
    width = 500,
    height = 500,
    id = 0;

function addRandom() {
  data.push({
    x: width * Math.random(),
    y: height * Math.random(),
    r: 10 * Math.random(),

RandomEtc

An exploration of Mike Bostock's take on Ben Fry’s zipdecode, inspired by Nelson Minar’s reimplementation. This one uses deeply nested SVG elements and classes to target only the things that need to change.

Nesting the SVG made DOM creation bearable, but this is still too slow. Use Mike's canvas approach if you're looking for the "best" way to do this.

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Fine-grained control of randomly entering and exiting things in D3.js, for impeccable object constancy. Adapted from an example co-authored with Mike Bostock.

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See https://twitter.com/ftrain/status/267503513477713920

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Tissot's Indicatrix rendered with D3.

NB:- see Jason's comment about these not being "true" Tissot indicatrices.

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// TODO: options parser with overrides for projection, area etc.
if (process.argv.length != 4) {
  console.error("usage: node convert.js <input.json> <output.json>");
  process.exit(1);
}

require('d3')
require('./node_modules/d3-plugins/simplify/simplify.js')

var fs = require('fs');

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Number of responses by zip code from the USGS' site from the 2011-11-05 3.2 quake near Piedmont, CA, USA, via Yahoo! Pipes.

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--- 
BUNDLE_WITHOUT: ""

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uniform sampler2D camTex;
uniform sampler2D xTex;
uniform sampler2D yTex;

// HSL functions from http://code.google.com/p/glmixer/source/browse/trunk/shaders/imageProcessing_fragment.glsl?spec=svn195&r=195

float HueToRGB(in float f1, in float f2, in float hue)
{
    if (hue < 0.0)
        hue += 1.0;