atestu/README.mdown

## README.md

      
    Raw
  

              README.md
            
          
    A simple SVG bar chart. Part of the tutorial series Let’s Make a Bar Chart.

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

.bar {
  fill: steelblue;
}

.axis text {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.x.axis path {
  display: none;
}

.editor, .svg {
  display: inline-block;
  vertical-align: top;
}

.editor {
  padding-left: 12px;
}

.svg {
  border-left: 1px solid #dedede;
  padding-left: 12px;
  margin-left: 12px;
}

</style>
<div class="editor">
  <p>Paste from Excel:</p>
  <textarea cols="13" rows="32">name	value
A	.08167
B	.01492
C	.02782
D	.04253
E	.12702
F	.02288
G	.02015
H	.06094
I	.06966
J	.00153
K	.00772
L	.04025
M	.02406
N	.06749
O	.07507
P	.01929
Q	.00095
R	.05987
S	.06327
T	.09056
U	.02758
V	.00978
W	.02360
X	.00150
Y	.01974
Z	.00074</textarea>
</div>
<div class="svg"><svg class="chart"></svg></div>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>

// all of these variables are independent of the data, so we exclude them from the draw function
var margin = {top: 20, right: 30, bottom: 30, left: 40},
    width = 800 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);

var y = d3.scale.linear()
    .range([height, 0]);

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

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

var chart = d3.select(".chart")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var gXAxis = chart.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")");

var gYAxis = chart.append("g")
    .attr("class", "y axis");

// this is the function that will be called each time we draw the chart
function draw () {
	// now we source the data from the textarea instead of the external file
  var data = d3.tsv.parse(d3.select('textarea').node().value);

  // the data may have changed so we need to update the domain of our scales
  x.domain(data.map(function(d) { return d.name; }));
  y.domain([0, d3.max(data, function(d) { return d.value; })]);

  // we update the axis to reflect the new scale domains
  gXAxis.call(xAxis);
  gYAxis.call(yAxis);

  var bars = chart.selectAll(".bar").data(data);

  // if there are new bars since we last called draw (or if it's the first time),
  // we add them now
  bars
    .enter().append("rect")
      .attr("class", "bar");

  // we update the bars with new attributes based on the new data
  bars
    .attr("x", function(d) { return x(d.name); })
    .attr("y", function(d) { return y(d.value); })
    .attr("height", function(d) { return height - y(d.value); })
    .attr("width", x.rangeBand());

  // maybe some bars are not present in the new data, let's remove them!
  bars.exit().remove();
}

function type(d) {
  d.value = +d.value; // coerce to number
  return d;
}

// we call the draw function when the focus is out of the textarea
d3.select('textarea').on('blur', draw);

// on page load we call the function which will use what is currently in the textarea
draw();

</script>

## thumbnail.png

      
    Raw
  

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

	.bar {
	fill: steelblue;
	}

	.axis text {
	font: 10px sans-serif;
	}

	.axis path,
	.axis line {
	fill: none;
	stroke: #000;
	shape-rendering: crispEdges;
	}

	.x.axis path {
	display: none;
	}

	.editor, .svg {
	display: inline-block;
	vertical-align: top;
	}

	.editor {
	padding-left: 12px;
	}

	.svg {
	border-left: 1px solid #dedede;
	padding-left: 12px;
	margin-left: 12px;
	}

	</style>
	<div class="editor">
	<p>Paste from Excel:</p>
	<textarea cols="13" rows="32">name value
	A .08167
	B .01492
	C .02782
	D .04253
	E .12702
	F .02288
	G .02015
	H .06094
	I .06966
	J .00153
	K .00772
	L .04025
	M .02406
	N .06749
	O .07507
	P .01929
	Q .00095
	R .05987
	S .06327
	T .09056
	U .02758
	V .00978
	W .02360
	X .00150
	Y .01974
	Z .00074</textarea>
	</div>
	<div class="svg"><svg class="chart"></svg></div>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script>

	// all of these variables are independent of the data, so we exclude them from the draw function
	var margin = {top: 20, right: 30, bottom: 30, left: 40},
	width = 800 - margin.left - margin.right,
	height = 500 - margin.top - margin.bottom;

	var x = d3.scale.ordinal()
	.rangeRoundBands([0, width], .1);

	var y = d3.scale.linear()
	.range([height, 0]);

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

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

	var chart = d3.select(".chart")
	.attr("width", width + margin.left + margin.right)
	.attr("height", height + margin.top + margin.bottom)
	.append("g")
	.attr("transform", "translate(" + margin.left + "," + margin.top + ")");

	var gXAxis = chart.append("g")
	.attr("class", "x axis")
	.attr("transform", "translate(0," + height + ")");

	var gYAxis = chart.append("g")
	.attr("class", "y axis");

	// this is the function that will be called each time we draw the chart
	function draw () {
	// now we source the data from the textarea instead of the external file
	var data = d3.tsv.parse(d3.select('textarea').node().value);

	// the data may have changed so we need to update the domain of our scales
	x.domain(data.map(function(d) { return d.name; }));
	y.domain([0, d3.max(data, function(d) { return d.value; })]);

	// we update the axis to reflect the new scale domains
	gXAxis.call(xAxis);
	gYAxis.call(yAxis);

	var bars = chart.selectAll(".bar").data(data);

	// if there are new bars since we last called draw (or if it's the first time),
	// we add them now
	bars
	.enter().append("rect")
	.attr("class", "bar");

	// we update the bars with new attributes based on the new data
	bars
	.attr("x", function(d) { return x(d.name); })
	.attr("y", function(d) { return y(d.value); })
	.attr("height", function(d) { return height - y(d.value); })
	.attr("width", x.rangeBand());

	// maybe some bars are not present in the new data, let's remove them!
	bars.exit().remove();
	}

	function type(d) {
	d.value = +d.value; // coerce to number
	return d;
	}

	// we call the draw function when the focus is out of the textarea
	d3.select('textarea').on('blur', draw);

	// on page load we call the function which will use what is currently in the textarea
	draw();

	</script>