Skip to content

Instantly share code, notes, and snippets.

@davo
Forked from mbostock/.block
Created December 18, 2012 14:13
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
Star You must be signed in to star a gist
Save davo/4328296 to your computer and use it in GitHub Desktop.

The tick format provided by d3.time.scale is a multi-scale tick format, meaning that it formats times differently depending on the time. For example, the start of February is formatted as "February", while February second is formatted as "Feb 2". The format is implemented using an array of time formats, each with an associated filter. The first filter that returns true is used. (In the implementation below, the formats are processed in reverse order.) You can create your own custom multi-scale time format using the same technique with only a few lines of code.

<!DOCTYPE html>
<meta charset="utf-8">
<style>
.axis text {
font: 10px sans-serif;
}
.axis line,
.axis path {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var customTimeFormat = timeFormat([
[d3.time.format("%Y"), function() { return true; }],
[d3.time.format("%B"), function(d) { return d.getMonth(); }],
[d3.time.format("%b %d"), function(d) { return d.getDate() != 1; }],
[d3.time.format("%a %d"), function(d) { return d.getDay() && d.getDate() != 1; }],
[d3.time.format("%I %p"), function(d) { return d.getHours(); }],
[d3.time.format("%I:%M"), function(d) { return d.getMinutes(); }],
[d3.time.format(":%S"), function(d) { return d.getSeconds(); }],
[d3.time.format(".%L"), function(d) { return d.getMilliseconds(); }]
]);
var margin = {top: 250, right: 40, bottom: 250, left: 40},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var x = d3.time.scale()
.domain([new Date(2012, 0, 1), new Date(2013, 0, 1)])
.range([0, width]);
var xAxis = d3.svg.axis()
.scale(x)
.tickFormat(customTimeFormat);
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 + ")");
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
function timeFormat(formats) {
return function(date) {
var i = formats.length - 1, f = formats[i];
while (!f[1](date)) f = formats[--i];
return f[0](date);
};
}
</script>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment