making_a_bar_chart_widths.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>D3: Making a bar chart with SVG rects, dynamic widths and spacing</title>
		<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
		<style type="text/css">
			/* No style rules here yet */		
		</style>
	</head>
	<body>
		<script type="text/javascript">
		window.onload = function() {
			//Width and height
			var w = 500;
			var h = 100;
			var barPadding = 1;
			
			var dataset = [ 5, 10, 13, 19, 21, 25, 22, 18, 15, 13,
							11, 12, 15, 20, 18, 17, 16, 18, 23, 25 ];
			
			//Create SVG element
			var svg = d3.select("body")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

			svg.selectAll("rect")
			   .data(dataset)
			   .enter()
			   .append("rect")
			   .attr("x", function(d, i) {
			   		return i * (w / dataset.length);
			   })
			   .attr("y", 0)
			   .attr("width", w / dataset.length - barPadding)
			   .attr("height", 100);
		}
		</script>
	</body>
</html>