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pie-chart.html
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pie-chart.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Pie Chart</title>
<link rel="stylesheet" type="text/css" href="../../css/styles.css"/>
<script type="text/javascript" src="../../lib/d3.js"></script>
</head>
<body>
<script type="text/javascript">
function pieChart() {
var _chart = {};
var _width = 500, _height = 500,
_data = [],
_colors = d3.scale.category20(),
_svg,
_bodyG,
_pieG,
_radius = 200,
_innerRadius = 100;
_chart.render = function () {
if (!_svg) {
_svg = d3.select("body").append("svg")
.attr("height", _height)
.attr("width", _width);
}
renderBody(_svg);
};
function renderBody(svg) {
if (!_bodyG)
_bodyG = svg.append("g")
.attr("class", "body");
renderPie();
}
function renderPie() {
var pie = d3.layout.pie() // <-A
.sort(function (d) {
return d.id;
})
.value(function (d) {
return d.value;
});
var arc = d3.svg.arc()
.outerRadius(_radius)
.innerRadius(_innerRadius);
if (!_pieG)
_pieG = _bodyG.append("g")
.attr("class", "pie")
.attr("transform", "translate("
+ _radius
+ ","
+ _radius + ")");
renderSlices(pie, arc);
renderLabels(pie, arc);
}
function renderSlices(pie, arc) {
var slices = _pieG.selectAll("path.arc")
.data(pie(_data)); // <-B
slices.enter()
.append("path")
.attr("class", "arc")
.attr("fill", function (d, i) {
return _colors(i);
});
slices.transition()
.attrTween("d", function (d) {
var currentArc = this.__current__; // <-C
if (!currentArc)
currentArc = {startAngle: 0,
endAngle: 0};
var interpolate = d3.interpolate(
currentArc, d);
this.__current__ = interpolate(1);//<-D
return function (t) {
return arc(interpolate(t));
};
});
}
function renderLabels(pie, arc) {
var labels = _pieG.selectAll("text.label")
.data(pie(_data)); // <-E
labels.enter()
.append("text")
.attr("class", "label");
labels.transition()
.attr("transform", function (d) {
return "translate("
+ arc.centroid(d) + ")"; // <-F
})
.attr("dy", ".35em")
.attr("text-anchor", "middle")
.text(function (d) {
return d.data.id;
});
}
_chart.width = function (w) {
if (!arguments.length) return _width;
_width = w;
return _chart;
};
_chart.height = function (h) {
if (!arguments.length) return _height;
_height = h;
return _chart;
};
_chart.colors = function (c) {
if (!arguments.length) return _colors;
_colors = c;
return _chart;
};
_chart.radius = function (r) {
if (!arguments.length) return _radius;
_radius = r;
return _chart;
};
_chart.innerRadius = function (r) {
if (!arguments.length) return _innerRadius;
_innerRadius = r;
return _chart;
};
_chart.data = function (d) {
if (!arguments.length) return _data;
_data = d;
return _chart;
};
return _chart;
}
function randomData() {
return Math.random() * 9 + 1;
}
function update() {
for (var j = 0; j < data.length; ++j)
data[j].value = randomData();
chart.render();
}
var numberOfDataPoint = 6,
data = [];
data = d3.range(numberOfDataPoint).map(function (i) {
return {id: i, value: randomData()};
});
var chart = pieChart()
.radius(200)
.innerRadius(100)
.data(data);
chart.render();
</script>
<div class="control-group">
<button onclick="update()">Update</button>
</div>
</body>
</html>