al cmdoptesc

Some of these files are from the us-atlas:

us.json - make topo/us-10m.json
us-congress-113.json - make topo/us-congress-10m.json

Others are from the world-atlas:

world-50m.json - make topo/world-50m.json
world-110m.json - make topo/world-110m.json

D3: Async Arc Progress Gauge / Meter

View on bl.ocks.org/cmdoptesc/e9b3bfc6f43b4bd237e2

Forked from Bostock's original Progress Events example to answer Rex X's post on the d3-js group:

The progress meter is based on the number of files that have downloaded. In our case, numberOfFiles is set to 20.

We then generate 20 random durations between 0 - 3000ms to simulate download times, and call setTimeout using the durations. Each timer then calls update, which increments the number of files downloaded, increasing the progress arc with a tweening function.

D3: Open Hours

view on bl.ocks.org
github repo

D3 visualisation utilising D3's text/CSV to read/parse a CSV file with restaurant information and display which restaurants are currently open.

Users can drag the time (red line) to display restaurants open at other hours.

D3: Arcs Tweening Animation

view on bl.ocks.org

Click on the grey circles. The green arcs will transition using attr, whereas the red ones will use the attrTween method.

If you have not seen/read Bostock's arc tween example, it's probably the best place to start. Secondly, I've posted up a basic example of drawing static, concentric arcs (gist), which might be helpful before adding on tweens/animations.

Below is some annotated source code from my experience playing with arcs. The biggest issue I came across was understanding the role of the arcTween helper function in relation to attrTween. Unlike attr, which takes a value as its second argument, attrTween requires a helper function, arcTween, which will be called during the intermediary animation ticks. This method was used for my [muniNow project](http

D3: Concentric Arcs

view on bl.ocks.org

The basics of drawing data-driven arcs by using values to determine the arc length. Very stripped down to give beginners an idea of how to draw and color shapes using the accessor functions in D3. For transitions and tweens, check out Bostock's well-annotated example, or my second arc example.

Idea was used for my SF Muni webapp (gist).

al lin, aug. 2013

muniNow Demo

muniNow aims to be a nicer NextMuni by giving users the ability to see when the soonest Muni bus is arriving at a glance.

Live demo on Bl.ocks.org

Powered by D3, built at Catalyst/Hack Reactor as a personal project. And many thanks to Mike and Adnan.

al lin, aug. 2013

	.d3-slider {
	position: relative;
	font-family: Verdana,Arial,sans-serif;
	font-size: 1.1em;
	border: 1px solid #aaaaaa;
	z-index: 2;
	}

	.d3-slider-horizontal {
	height: .8em;

	// quicksort using new arrays is easy, but surprisingly, there weren't too many examples
	// in javascript of in-place quick sort...

	// the outer function is simply just a wrapper that copies the original array;
	// you can just use lines 12-37 if preserving the original array isn't important

	function quickSortInPlace(unsortedArray) {

	var unsorted = unsortedArray.slice(); // copy the original array

	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	.graticule {
	fill: none;
	stroke: #777;
	stroke-opacity: .5;
	stroke-width: .5px;
	}

	// Express CORS middleware.. so much easier than trying to get Restify to work

	var allowCrossDomain = function(req, res, next) {
	res.header('Access-Control-Allow-Origin', '*');
	res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
	res.header('Access-Control-Allow-Headers', 'X-Requested-With, Accept, Origin, Referer, User-Agent, Content-Type, Authorization');

	// intercept OPTIONS method
	if (req.method === 'OPTIONS') {
	res.send(200);