Intermediate D3: Week 1

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>Project 1</title>
		<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script>
		<style type="text/css">

body {
				margin: 0;
				background-color: lightGray;
				font-family: Helvetica, Arial, sans-serif;
			}

#container {
				width: 960px;
				height: 500px;
				margin-left: auto;
				margin-right: auto;
				padding: 5px;
				background-color: white;
				box-shadow: 3px 3px 5px 6px #ccc;
			}

h1 {
				font-size: 24px;
				margin: 0;
			}

p {
				font-size: 14px;
				margin: 15px 0 10px 0;
			}

a:link {
				text-decoration: none;
				color: gray;
			}

a:hover {
				text-decoration: underline;
			}

a:visited {
				color: gray;
			}

a:active {
				color: steelBlue;
			}

svg {
				background-color: white;
			}

g.bar text {
				font-size: 11px;
				font-weight: bold;
				text-anchor: end;
				opacity: 0;
			}

g.bar:hover rect {
				fill: orange;
			}

g.bar:hover text {
				opacity: 1;
				font-weith: normal;
				font-size: 9px;
				fill: blue;
			}

.axis path,
			.axis line {
				fill: none;
				stroke: black;
				shape-rendering: crispEdges;
			}

.axis text {
				font-family: sans-serif;
				font-size: 9px;
			}

.y.axis path,
			.y.axis line {
				opacity: 0;
			}

</style>
	</head>
	<body>

<h2>U.S. mass killings since 2006</h1>

<p>The FBI defines mass killings as 4 or more victims, not including the killer. <strong>Source:</strong> <a href="https://www.usatoday.com/story/news/nation/2013/09/16/mass-killings-data-map/2820423/">USA Today, 2013</a></p>

</div>

var w = 940;
			var h = 400;
			var padding = [ 0, 10, 20, 40 ];  //Top, right, bottom, left

var widthScale = d3.scale.linear()
								.range([ 0, w - padding[1] - padding[3] ]);

var heightScale = d3.scale.ordinal()
								.rangeRoundBands([ padding[0], h - padding[2] ], 0.1);

var xAxis = d3.svg.axis()
							.scale(widthScale)
							.orient("bottom");

var yAxis = d3.svg.axis()
							.scale(heightScale)
							.orient("left");

// To be specific we append SVG to #container
			var svg = d3.select("#container")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

// https://www.usatoday.com/story/news/nation/2013/09/16/mass-killings-data-map/2820423/
			d3.csv("mass-shootings.csv", function(data) {
				data.forEach(function(d) {
					d.victims = +d.victims;
				});

data = d3.nest()
					.key(function(d) { return d.state; })
					.rollup(function(v) { return d3.sum(v, function(d) { return d.victims; }); })
					.entries(data);
					// Note the map returns an object, not an array.
					//.map(data);

data.sort(function(a, b){
					if(b.values > a.values){
						return 1;
					} else if(b.values === a.values) {
						return 0;
					} else { // b.values < a.values
						return -1;
					}
				});

widthScale.domain([ 0, d3.max(data, function(d) {
					return d.values;
				}) ]);

heightScale.domain(data.map(function(d) { return d.key; } ));

// Bind data to groups (not bars directly)
				var groups = svg.selectAll("g")
					.data(data)
					.enter()
					.append("g")
					.attr("class", "bar");

// Add a rect to each group
				var rects = groups.append("rect")
					.attr("x", padding[3])
					.attr("y", function(d) {
						return heightScale(d.key);
					})
					.attr("width", 0)
					.attr("height", heightScale.rangeBand())
					.attr("fill", "steelblue");

// This invisble rect will overlay blue rectangles
				groups.append("rect")
					.attr("x", padding[3])
					.attr("y", function(d) {
						return heightScale(d.key);
					})
					.attr("width", widthScale(d3.max(data, function(d) {
						return d.values;
					})))
					.attr("height", heightScale.rangeBand())
					.style("opacity", 0);

// Add a text element to each group
				groups.append("text")
					.attr("x", function(d) {
						return padding[3] + widthScale(d.values) - 3;
					})
					.attr("y", function(d) {
						return heightScale(d.key) + 7;
					})
					.text(function(d) {
						return d.values;
					});

rects.transition()
					.delay(function(d, i) {
						return i * 50;
					})
					.duration(1000)
					.attr("width", function(d) {
						return widthScale(d.values);
					});

svg.append("g")
					.attr("class", "x axis")
					.attr("transform", "translate(" + padding[3] + "," + (h - padding[2]) + ")")
					.call(xAxis);

svg.append("g")
					.attr("class", "y axis")
					.attr("transform", "translate(" + padding[3] + ",0)")
					.call(yAxis);

});

</script>

</body>
</html>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js