|
<!DOCTYPE html> |
|
<html> |
|
<head> |
|
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/> |
|
<title>Donut Chart - Centered Labels</title> |
|
|
|
<!-- D3.js --> |
|
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script> |
|
|
|
<!-- Month names --> |
|
<link href='http://fonts.googleapis.com/css?family=Pacifico' rel='stylesheet' type='text/css'> |
|
|
|
<style> |
|
body { |
|
font-family: 'Pacifico', sans-serif; |
|
fill: #333333; |
|
font-size: 16px; |
|
text-align: center; |
|
} |
|
</style> |
|
</head> |
|
<body> |
|
|
|
<div id="chart"></div> |
|
|
|
<script> |
|
|
|
//////////////////////////////////////////////////////////// |
|
//////////////////////// Set-up //////////////////////////// |
|
//////////////////////////////////////////////////////////// |
|
|
|
var screenWidth = window.innerWidth; |
|
|
|
var margin = {left: 20, top: 20, right: 20, bottom: 20}, |
|
width = Math.min(screenWidth, 500) - margin.left - margin.right, |
|
height = Math.min(screenWidth, 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("class", "wrapper") |
|
.attr("transform", "translate(" + (width / 2 + margin.left) + "," + (height / 2 + margin.top) + ")"); |
|
|
|
////////////////////////////////////////////////////////////// |
|
///////////////////// Data & Scales ///////////////////////// |
|
////////////////////////////////////////////////////////////// |
|
|
|
//Some random data |
|
var donutData = [ |
|
{name: "Antelope", value: 15}, |
|
{name: "Bear", value: 9}, |
|
{name: "Cheetah", value: 19}, |
|
{name: "Dolphin", value: 12}, |
|
{name: "Elephant", value: 14}, |
|
{name: "Flamingo", value: 21}, |
|
{name: "Giraffe", value: 18}, |
|
{name: "Other", value: 8} |
|
]; |
|
|
|
//Create a color scale |
|
var colorScale = d3.scale.linear() |
|
.domain([1,3.5,6]) |
|
.range(["#2c7bb6", "#ffffbf", "#d7191c"]) |
|
.interpolate(d3.interpolateHcl); |
|
|
|
//Create an arc function |
|
var arc = d3.svg.arc() |
|
.innerRadius(width*0.75/2) |
|
.outerRadius(width*0.75/2 + 30); |
|
|
|
//Turn the pie chart 90 degrees counter clockwise, so it starts at the left |
|
var pie = d3.layout.pie() |
|
.startAngle(-90 * Math.PI/180) |
|
.endAngle(-90 * Math.PI/180 + 2*Math.PI) |
|
.value(function(d) { return d.value; }) |
|
.padAngle(.01) |
|
.sort(null); |
|
|
|
////////////////////////////////////////////////////////////// |
|
//////////////////// Create Donut Chart ////////////////////// |
|
////////////////////////////////////////////////////////////// |
|
|
|
//Create the donut slices and also the invisible arcs for the text |
|
svg.selectAll(".donutArcSlices") |
|
.data(pie(donutData)) |
|
.enter().append("path") |
|
.attr("class", "donutArcSlices") |
|
.attr("d", arc) |
|
.style("fill", function(d,i) { |
|
if(i === 7) return "#CCCCCC"; //Other |
|
else return colorScale(i); |
|
}) |
|
.each(function(d,i) { |
|
|
|
//A regular expression that captures all in between the start of a string (denoted by ^) and a capital letter L |
|
//The letter L denotes the start of a line segment |
|
//The "all in between" is denoted by the .+? |
|
//where the . is a regular expression for "match any single character except the newline character" |
|
//the + means "match the preceding expression 1 or more times" (thus any single character 1 or more times) |
|
//the ? has to be added to make sure that it stops at the first L it finds, not the last L |
|
//It thus makes sure that the idea of ^.*L matches the fewest possible characters |
|
//For more information on regular expressions see: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions |
|
var firstArcSection = /(^.+?)L/; |
|
|
|
//Grab everything up to the first Line statement |
|
//The [1] gives back the expression between the () (thus not the L as well) which is exactly the arc statement |
|
var newArc = firstArcSection.exec( d3.select(this).attr("d") )[1]; |
|
//Replace all the comma's so that IE can handle it -_- |
|
//The g after the / is a modifier that "find all matches rather than stopping after the first match" |
|
newArc = newArc.replace(/,/g , " "); |
|
|
|
//Create a new invisible arc that the text can flow along |
|
svg.append("path") |
|
.attr("class", "hiddenDonutArcs") |
|
.attr("id", "donutArc"+i) |
|
.attr("d", newArc) |
|
.style("fill", "none"); |
|
}); |
|
|
|
//Append the label names on the outside |
|
svg.selectAll(".donutText") |
|
.data(donutData) |
|
.enter().append("text") |
|
.attr("class", "donutText") |
|
.attr("dy", -13) |
|
.append("textPath") |
|
.attr("startOffset","50%") |
|
.style("text-anchor","middle") |
|
.attr("xlink:href",function(d,i){return "#donutArc"+i;}) |
|
.text(function(d){return d.name;}); |
|
|
|
</script> |
|
|
|
</body> |
|
</html> |