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@nrabinowitz
nrabinowitz / quantize.js
Created Jul 25, 2011
Javascript module for color quantization, based on Leptonica
View quantize.js
/*!
* quantize.js Copyright 2008 Nick Rabinowitz.
* Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
*/
// fill out a couple protovis dependencies
/*!
* Block below copied from Protovis: http://mbostock.github.com/protovis/
* Copyright 2010 Stanford Visualization Group
* Licensed under the BSD License: http://www.opensource.org/licenses/bsd-license.php
@nrabinowitz
nrabinowitz / progsvc.php
Created Aug 6, 2011
Mock PHP service for timemap.js progressive loading
View progsvc.php
<?
// get timestamps
$start = strtotime($_GET['start']);
$end = strtotime($_GET['end']);
$cb = $_GET['callback'];
// start data
echo "$cb([";
@nrabinowitz
nrabinowitz / index.html
Created Oct 31, 2011 — forked from njvack/index.html
Beeswarm plot with gravity and collisions
View index.html
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<title>Beeswarm plot - collision detection</title>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.geom.js"></script>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js"></script>
</head>
<body>
@nrabinowitz
nrabinowitz / fitProjection.js
Created Feb 7, 2012
D3 function for fitting a projection to geodata
View fitProjection.js
function fitProjection(projection, data, box, center) {
// get the bounding box for the data - might be more efficient approaches
var left = Infinity,
bottom = -Infinity,
right = -Infinity,
top = Infinity;
// reset projection
projection
.scale(1)
.translate([0, 0]);
@nrabinowitz
nrabinowitz / index.html
Created Mar 14, 2012
Histogram with a normal distribution
View index.html
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>Histogram</title>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.v2.min.js"></script>
<style type="text/css">
body {
margin: 3em;
}
@nrabinowitz
nrabinowitz / .gitignore
Created Apr 22, 2012 — forked from karmi/.gitignore
Life Expectancy Slope Graph [WIP]
@nrabinowitz
nrabinowitz / index.html
Created Sep 7, 2012 — forked from stepheneb/index.html
D3 Example: zoom, pan, and axis rescale
View index.html
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>One Graph</title>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.v2.js"></script>
<script type="text/javascript" src="simple-graph.js"></script>
<style type="text/css">
body { font: 13px sans-serif; }
rect { fill: #fff; }
@nrabinowitz
nrabinowitz / README.md
Created Dec 9, 2012
Raster geocoding with D3.js
View README.md

This demonstrates raster-based reverse geocoding using canvas and D3.js. Geocoding is based on the color of the pixel at a given projected position. Note that the canvas is only shown here for the sake of explanation and debugging - this would in fact probably work faster if the canvas was not attached to the document at all.

The biggest remaining issue here is precision, which depends on:

  • the size of the canvas, and
  • the projection used.

Determining the optimum size based on the accuracy of your data is left as an exercise for the reader. Edge cases will also fail here, generally returning null - one option might be to stroke neighborhoods in a color, and then return an "uncertain" value for any non-grayscale pixel.

@nrabinowitz
nrabinowitz / gist:75611aea890afe21b234
Created Oct 3, 2014
Git branch and status color in prompt
View gist:75611aea890afe21b234
c_cyan=`tput setaf 6`
c_red=`tput setaf 1`
c_green=`tput setaf 2`
c_sgr0=`tput sgr0`
parse_git_branch ()
{
if git rev-parse --git-dir >/dev/null 2>&1
then
gitver="[$(git branch 2>/dev/null| sed -n '/^\*/s/^\* //p')]"
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