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:
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<meta charset="utf-8">
<style>
.bar {
fill: steelblue;
}
.bar:hover {
fill: rgb(150,165,180);
}
.axis {
font: 10px sans-serif;
fill: white;
}
.axis path,
.axis line {
fill: none;
stroke: white;
shape-rendering: crispEdges;
}
.x.axis path {
display: none;
}
body {
background-color: rgb(50, 60, 70);
color: white;
}
.x.axis {
color: white;
}
.tooltip {
background-color: rgba(160, 170, 187, 0.5);
margin: 10px;
height: 70px;
width: 200px;
padding-left: 10px;
padding-top: 10px;
-webkit-border-radius: 10px;
-moz-border-radius: 10px;
border-radius: 10px;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script type="text/javascript" src="tooltips.js"></script>
<script>
var margin = {top: 20, right: 20, bottom: 30, left: 40},
width = 960 - 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")
.ticks(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;
x.domain(data.map(function(d) { return d.letter; }));
y.domain([0, d3.max(data, function(d) { return d.frequency; })]);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", ".71em")
.style("text-anchor", "end")
.text("Frequency");
svg.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) { return x(d.letter); })
.attr("width", x.rangeBand())
.attr("y", function(d) { return y(d.frequency); })
.attr("height", function(d) { return height - y(d.frequency); })
.call(d3.helper.tooltip(function (d) {return "letter: <b>" + d.letter + "</b><br/>frequency: " + d.frequency;}));
});
function type(d) {
d.frequency = +d.frequency;
return d;
}
</script>
https://d3js.org/d3.v3.min.js