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@pavelloz pavelloz/README.md
Last active Apr 27, 2016

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Pie Chart Labels with missing data

This variation of a donut chart demonstrates how to add labels with lines and also works with missing/new data. Clicking on the button changes the displayed data.

forked from dbuezas's block: Pie Chart Labels with missing data

<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
width: 960px;
height: 500px;
position: relative;
}
svg{
width: 100%;
height: 100%;
}
path.slice{
stroke-width:2px;
}
polyline{
opacity: .3;
stroke: black;
stroke-width: 2px;
fill: none;
}
</style>
<body>
Duration: 0<input type="range" id="duration" min="0" max="5000">5000
<br>
<button class="randomize">randomize</button>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var svg = d3.select("body")
.append("svg")
.append("g")
svg.append("g")
.attr("class", "slices");
svg.append("g")
.attr("class", "labels");
svg.append("g")
.attr("class", "lines");
var width = 960,
height = 450,
radius = Math.min(width, height) / 2;
var pie = d3.layout.pie()
.sort(null)
.value(function(d) {
return d.value;
});
var arc = d3.svg.arc()
.outerRadius(radius * 0.8)
.innerRadius(radius * 0.4);
var outerArc = d3.svg.arc()
.innerRadius(radius * 0.9)
.outerRadius(radius * 0.9);
svg.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
var key = function(d){ return d.data.label; };
var color = d3.scale.category20()
.domain(["Lorem ipsum", "dolor sit", "amet", "consectetur", "adipisicing", "elit", "sed", "do", "eiusmod", "tempor", "incididunt"])
//.range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);
function randomData (){
var labels = color.domain();
return labels.map(function(label){
return { label: label, value: Math.random() }
}).filter(function() {
return Math.random() > .5;
}).sort(function(a,b) {
return d3.ascending(a.label, b.label);
});
}
change(randomData());
d3.select(".randomize")
.on("click", function(){
change(randomData());
});
function mergeWithFirstEqualZero(first, second){
var secondSet = d3.set(); second.forEach(function(d) { secondSet.add(d.label); });
var onlyFirst = first
.filter(function(d){ return !secondSet.has(d.label) })
.map(function(d) { return {label: d.label, value: 0}; });
return d3.merge([ second, onlyFirst ])
.sort(function(a,b) {
return d3.ascending(a.label, b.label);
});
}
function change(data) {
var duration = +document.getElementById("duration").value;
var data0 = svg.select(".slices").selectAll("path.slice")
.data().map(function(d) { return d.data });
if (data0.length == 0) data0 = data;
var was = mergeWithFirstEqualZero(data, data0);
var is = mergeWithFirstEqualZero(data0, data);
/* ------- SLICE ARCS -------*/
var slice = svg.select(".slices").selectAll("path.slice")
.data(pie(was), key);
slice.enter()
.insert("path")
.attr("class", "slice")
.style("fill", function(d) { return color(d.data.label); })
.each(function(d) {
this._current = d;
// console.log('slice', this._current);
});
slice = svg.select(".slices").selectAll("path.slice")
.data(pie(is), key);
slice
.transition().duration(duration)
.attrTween("d", function(d) {
var interpolate = d3.interpolate(this._current, d);
console.log(d, interpolate);
debugger;
var _this = this;
return function(t) {
_this._current = interpolate(t);
return arc(_this._current);
};
});
slice = svg.select(".slices").selectAll("path.slice")
.data(pie(data), key);
slice
.exit().transition().delay(duration).duration(0)
.remove();
/* ------- TEXT LABELS -------*/
var text = svg.select(".labels").selectAll("text")
.data(pie(was), key);
text.enter()
.append("text")
.attr("dy", ".35em")
.style("opacity", 0)
.text(function(d) {
return d.data.label;
})
.each(function(d) {
this._current = d;
});
function midAngle(d){
return d.startAngle + (d.endAngle - d.startAngle)/2;
}
text = svg.select(".labels").selectAll("text")
.data(pie(is), key);
text.style("opacity", 1)
.attr("transform", function(d) {
var interpolate = d3.interpolate(this._current, d);
var d2 = interpolate(0);
var pos = outerArc.centroid(d2);
pos[0] = radius * (midAngle(d2) < Math.PI ? 1 : -1);
return "translate("+ pos +")";
})
.style("text-anchor", function(d){
var interpolate = d3.interpolate(this._current, d);
var d2 = interpolate(0);
return midAngle(d2) < Math.PI ? "start":"end";
});
text = svg.select(".labels").selectAll("text")
.data(pie(data), key);
text
.exit().transition().delay(duration)
.remove();
/* ------- SLICE TO TEXT POLYLINES -------*/
var polyline = svg.select(".lines").selectAll("polyline")
.data(pie(was), key);
polyline.enter()
.append("polyline")
.style("opacity", 0)
.each(function(d) {
this._current = d;
});
polyline = svg.select(".lines").selectAll("polyline")
.data(pie(is), key);
polyline.transition().duration(duration)
.style("opacity", function(d) {
return d.data.value == 0 ? 0 : .5;
})
.attrTween("points", function(d){
this._current = this._current;
var interpolate = d3.interpolate(this._current, d);
var _this = this;
return function(t) {
var d2 = interpolate(t);
_this._current = d2;
var pos = outerArc.centroid(d2);
pos[0] = radius * 0.95 * (midAngle(d2) < Math.PI ? 1 : -1);
return [arc.centroid(d2), outerArc.centroid(d2), pos];
};
});
polyline = svg.select(".lines").selectAll("polyline")
.data(pie(data), key);
polyline
.exit().transition().delay(duration)
.remove();
};
</script>
</body>
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