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mbostock/.block

Last active Feb 9, 2016
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Log Axis with Zero
license: gpl-3.0

You might reserve a special place to render zeroes when using a log axis, since normally these will be displayed at infinity. However, since this represents a discontinuity in the encoding, it’s important to show the discontinuity visually.

<!DOCTYPE html>
<meta charset="utf-8">
<style>
.axis text {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var margin = {top: 210, right: 20, bottom: 220, left: 60},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var x = d3.scale.log()
.domain([1e-1, 1e4])
.range([0, width]);
var x0 = d3.scale.ordinal()
.domain([0])
.range([-30]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom")
.ticks(20, d3.format(",.1s"));
var x0Axis = d3.svg.axis()
.scale(x0)
.orient("bottom");
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.right + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
svg.append("g")
.attr("class", "x axis")
.call(xAxis);
svg.append("g")
.attr("class", "x-zero axis")
.call(x0Axis);
</script>
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