d3course_intermediate_module1

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Bar Chart, Framed</title>
		<script type="text/javascript" src="//d3js.org/d3.v3.min.js" charset="utf-8"></script>
		<style type="text/css">
			
			body {
				margin: 0;
				background-color: lightGray;
				font-family: Helvetica, Arial, sans-serif;
			}

#container {
				width: 700px;
				margin-left: auto;
				margin-right: auto;
				margin-top: 50px;
				padding: 50px;
				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: black;
			}

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;
			}
			
			.axis path,
			.axis line {
				fill: none;
				stroke: white;
				shape-rendering: crispEdges;
			}
			
			.axis text {
				font-family: sans-serif;
				font-size: 11px;
                stroke: white;
			}

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

</style>
	</head>
	<body>

<h1>Distibution of plant symbols by family</h1>

<p>TThe USDA maintains a Plants list.  This shows only the top 50 families and the number of symbols in each, showing that the world of plants is quite large and varied. <strong>Source:</strong> <a href="https://www.plants.usda.gov/dl_all.html">PLANTS Checklist</a></p>

</div>

var w = 700;
			var h = 800;
			var padding = [ 20, 10, 30, 120 ];  //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");

//Now SVG goes into #container instead of body
			var svg = d3.select("#container")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

d3.tsv("../data/plants/plants_top_50_families.tsv", function(data) {

data.sort(function(a, b) {
					return d3.descending(+a.numSymbols);
				});

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

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

//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.Family);
					})
					.attr("width", 0)
					.attr("height", heightScale.rangeBand())
					.attr("fill", "steelblue");

//Add a text element to each group
				groups.append("text")
					.attr("x", function(d) {
						return padding[3] + widthScale(d.numSymbols) - 3;
					})
					.attr("y", function(d) {
						return heightScale(d.Family) + 11;
					})
					.text(function(d) {
						return d.numSymbols;
					});

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

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://d3js.org/d3.v3.min.js