scottkildall/README.md

## README.md

      
    Raw
  

              README.md
            
          
    This simple bar chart is constructed from a TSV file storing the frequency of letters in the English language. The chart employs conventional margins and a number of D3 features:

d3.tsv - load and parse data
d3.format - format percentages
d3.scale.ordinal - x-position encoding
d3.scale.linear - y-position encoding
d3.max - compute domains
d3.svg.axis - display axes

forked from mbostock's block: Bar Chart
forked from zanarmstrong's block: Bar Chart: stripped easier

  
## data.tsv

          
            letter
            frequency

            
              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

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

.bar {
  fill: steelblue;
}

.bar:hover {
  fill: brown;
}

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

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

.x.axis path {
  display: none;
}

</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script>

// INSTRUCTIONS: everywhere there is "xxxxx", replace with code

var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var xScale = 10;


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

d3.tsv("data.tsv", type, function(error, data) {
  if (error) throw error;


  console.log(width);
  console.log(data.length);

  // increment for each
  xScale = width/data.length;

  var letters = data.map(function(d) { return d.letter; });
  var maxFrequency = d3.max(data, function(d) { return d.frequency; })

  yScale = d3.scale.linear().domain([0, maxFrequency]).range([0,height])

  // frequency is 0-1

  svg.selectAll(".bar")
      .data(data)
    	.enter().append("rect")
      .attr("class", "bar")
      .attr("x", mapX)
      .attr("width", 20)
      .attr("y", mapY)
      .attr("height", mapH);
});


function mapX(d,i) {
   //console.log(i*10);
  return i * xScale;
}

 function mapY(d,i) {
  //-- in theory we'd map the frequency max
  return height - yScale(d.frequency)
}

function mapH(d,i) {
  //-- in theory we'd map the frequency max
  return yScale(d.frequency);
}
function type(d) {
  d.frequency = +d.frequency;
  return d;
}

</script>
	letter	frequency
	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
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	.bar {
	fill: steelblue;
	}

	.bar:hover {
	fill: brown;
	}

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

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

	.x.axis path {
	display: none;
	}

	</style>
	<body>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
	<script>

	// INSTRUCTIONS: everywhere there is "xxxxx", replace with code

	var margin = {top: 20, right: 20, bottom: 30, left: 40},
	width = 960 - margin.left - margin.right,
	height = 500 - margin.top - margin.bottom;

	var xScale = 10;


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

	d3.tsv("data.tsv", type, function(error, data) {
	if (error) throw error;


	console.log(width);
	console.log(data.length);

	// increment for each
	xScale = width/data.length;

	var letters = data.map(function(d) { return d.letter; });
	var maxFrequency = d3.max(data, function(d) { return d.frequency; })

	yScale = d3.scale.linear().domain([0, maxFrequency]).range([0,height])

	// frequency is 0-1

	svg.selectAll(".bar")
	.data(data)
	.enter().append("rect")
	.attr("class", "bar")
	.attr("x", mapX)
	.attr("width", 20)
	.attr("y", mapY)
	.attr("height", mapH);
	});


	function mapX(d,i) {
	//console.log(i*10);
	return i * xScale;
	}

	function mapY(d,i) {
	//-- in theory we'd map the frequency max
	return height - yScale(d.frequency)
	}

	function mapH(d,i) {
	//-- in theory we'd map the frequency max
	return yScale(d.frequency);
	}
	function type(d) {
	d.frequency = +d.frequency;
	return d;
	}

	</script>