mbostock/README.md Secret

## index.html
<!DOCTYPE html>
<html>
  <head>
    <title>Histogram</title>
    <script type="text/javascript" src="https://github.com/mbostock/d3/raw/v1.17.0/d3.js"></script>
    <script type="text/javascript" src="https://github.com/mbostock/d3/raw/v1.17.0/d3.layout.js"></script>
    <style type="text/css">

body {
  font: 10px sans-serif;
}

rect {
  fill: steelblue;
  stroke: white;
}

line {
  stroke: black;
  shape-rendering: crispEdges;
}

    </style>
  </head>
  <body>
    <script type="text/javascript">

var n = 10000, // number of trials
    m = 10,    // number of random variables
    data = [];

// Generate an Irwin-Hall distribution.
for (var i = 0; i < n; i++) {
  for (var s = 0, j = 0; j < m; j++) {
    s += Math.random();
  }
  data.push(s);
}

var w = 400,
    h = 400;

var histogram = d3.layout.histogram()
    (data);

var x = d3.scale.ordinal()
    .domain(histogram.map(function(d) { return d.x; }))
    .rangeRoundBands([0, w]);

var y = d3.scale.linear()
    .domain([0, d3.max(histogram, function(d) { return d.y; })])
    .range([0, h]);

var vis = d3.select("body").append("svg:svg")
    .attr("width", w)
    .attr("height", h)
  .append("svg:g")
    .attr("transform", "translate(.5)");

vis.selectAll("rect")
    .data(histogram)
  .enter().append("svg:rect")
    .attr("transform", function(d) { return "translate(" + x(d.x) + "," + (h - y(d.y)) + ")"; })
    .attr("width", x.rangeBand())
    .attr("y", function(d) { return y(d.y); })
    .attr("height", 0)
  .transition()
    .duration(750)
    .attr("y", 0)
    .attr("height", function(d) { return y(d.y); });

vis.append("svg:line")
    .attr("x1", 0)
    .attr("x2", w)
    .attr("y1", h)
    .attr("y2", h);

    </script>
  </body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Histogram</title>
	<script type="text/javascript" src="https://github.com/mbostock/d3/raw/v1.17.0/d3.js"></script>
	<script type="text/javascript" src="https://github.com/mbostock/d3/raw/v1.17.0/d3.layout.js"></script>
	<style type="text/css">

	body {
	font: 10px sans-serif;
	}

	rect {
	fill: steelblue;
	stroke: white;
	}

	line {
	stroke: black;
	shape-rendering: crispEdges;
	}

	</style>
	</head>
	<body>
	<script type="text/javascript">

	var n = 10000, // number of trials
	m = 10, // number of random variables
	data = [];

	// Generate an Irwin-Hall distribution.
	for (var i = 0; i < n; i++) {
	for (var s = 0, j = 0; j < m; j++) {
	s += Math.random();
	}
	data.push(s);
	}

	var w = 400,
	h = 400;

	var histogram = d3.layout.histogram()
	(data);

	var x = d3.scale.ordinal()
	.domain(histogram.map(function(d) { return d.x; }))
	.rangeRoundBands([0, w]);

	var y = d3.scale.linear()
	.domain([0, d3.max(histogram, function(d) { return d.y; })])
	.range([0, h]);

	var vis = d3.select("body").append("svg:svg")
	.attr("width", w)
	.attr("height", h)
	.append("svg:g")
	.attr("transform", "translate(.5)");

	vis.selectAll("rect")
	.data(histogram)
	.enter().append("svg:rect")
	.attr("transform", function(d) { return "translate(" + x(d.x) + "," + (h - y(d.y)) + ")"; })
	.attr("width", x.rangeBand())
	.attr("y", function(d) { return y(d.y); })
	.attr("height", 0)
	.transition()
	.duration(750)
	.attr("y", 0)
	.attr("height", function(d) { return y(d.y); });

	vis.append("svg:line")
	.attr("x1", 0)
	.attr("x2", w)
	.attr("y1", h)
	.attr("y2", h);

	</script>
	</body>
	</html>