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@HarryStevens HarryStevens/.block

Last active Jan 13, 2018
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Positive-Negative Bar Chart
license: gpl-3.0

Create a bar chart with positive and negative values along the horizontal axis with D3.js.

name value
A 1.31
B -3.63
C -2.96
D 1.41
E -2.03
F -3.82
G 1.41
H 0.45
I -3.26
J 2.13
K 0.84
L -0.05
M -1.43
N -1.81
O -0.71
P 1.94
Q 14.68
R 0.33
S -1.86
T 0.69
U -2.41
V 0.04
W -3.12
X 0.8
Y 0.77
Z -4.42
<html>
<head>
<style>
body {
font-family: "Helvetica Neue", sans-serif;
margin: 0 auto;
display: table;
}
.name, .value {
font-size: .7em;
}
</style>
</head>
<body>
<div class="chart"></div>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
var margin = {top: 10, right: 0, bottom: 0, left: 0},
width = 400 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var svg = d3.select(".chart").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 + ")");
var x = d3.scaleLinear()
.range([0,width]);
var y = d3.scaleBand()
.rangeRound([height,0])
.padding(0.2);
d3.csv("data.csv",types,function(error,data){
if (error) throw error;
data.sort(function(a,b){
return b.value - a.value;
});
x.domain(d3.extent(data, function(d){ return d.value; }));
y.domain(data.map(function(d) { return d.name; }));
svg.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d){ return d.value < 0 ? x(d.value) : x(0); })
.attr("width", function(d){ return d.value < 0 ? x(d.value * -1) - x(0) : x(d.value) - x(0); })
.attr("y", function(d){ return y(d.name); })
.attr("height", y.bandwidth())
.attr("fill", function(d){ return d.value < 0 ? "#d7191c": "#1a9641"; });
svg.selectAll(".value")
.data(data)
.enter().append("text")
.attr("class", "value")
.attr("x", function(d){
if (d.value < 0){
return (x(d.value * -1) - x(0)) > 20 ? x(d.value) + 2 : x(d.value) - 1;
} else {
return (x(d.value) - x(0)) > 20 ? x(d.value) - 2 : x(d.value) + 1;
}
})
.attr("y", function(d){ return y(d.name); })
.attr("dy", y.bandwidth() - 2.55)
.attr("text-anchor", function(d){
if (d.value < 0){
return (x(d.value * -1) - x(0)) > 20 ? "start" : "end";
} else {
return (x(d.value) - x(0)) > 20 ? "end" : "start";
}
})
.style("fill", function(d){
if (d.value < 0){
return (x(d.value * -1) - x(0)) > 20 ? "#fff" : "#3a403d";
} else {
return (x(d.value) - x(0)) > 20 ? "#fff" : "#3a403d";
}
})
.text(function(d){ return d.value; });
svg.selectAll(".name")
.data(data)
.enter().append("text")
.attr("class", "name")
.attr("x", function(d){ return d.value < 0 ? x(0) + 2.55 : x(0) - 2.55 })
.attr("y", function(d){ return y(d.name); })
.attr("dy", y.bandwidth() - 2.55)
.attr("text-anchor", function(d){ return d.value < 0 ? "start" : "end"; })
.text(function(d){ return d.name; });
svg.append("line")
.attr("x1", x(0))
.attr("x2", x(0))
.attr("y1", 0 + margin.top)
.attr("y2", height - margin.top)
.attr("stroke", "#3a403d")
.attr("stroke-width", "1px");
});
function types(d){
d.value = +d.value;
return d;
}
</script>
</body>
</html>
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