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@jonsadka
Last active Sep 12, 2019
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Interactive donut chart with transitions
license: gpl-3.0

By create large random datasets, we can create charts that adapt and react to any dataset. This bl.ock allows users to generate any desired number of lines and any desired number of points and see the response of the chart change over time.

<!DOCTYPE HTML>
<meta charset="utf-8">
<html>
<style>
body {
font: 10px sans-serif;
}
div {
padding-left: 100px;
padding-top: 10px;
width: 30%;
margin: 0 auto;
font: 14px;
}
input {
border-top: 0;
border-left: 0;
border-right: 0;
text-align: center;
font: 14px;
width: 60px;
}
</style>
<body>
<div>
Number of datapoints:
<input id="datacount" onkeyup="render()" value="15" name="datapoints"></input>
</div>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
var width = 960,
height = 500 - 29; // adjust for height of input bar div
var color = d3.scale.category20();
// draw and append the container
var svg = d3.select("body").append("svg")
.attr("width", width).attr("height", height);
// set the thickness of the inner and outer radii
var min = Math.min(width, height);
var oRadius = min / 2 * 0.9;
var iRadius = min / 2 * 0.85;
// construct default pie laoyut
var pie = d3.layout.pie().value(function(d){ return d; }).sort(null);
// construct arc generator
var arc = d3.svg.arc()
.outerRadius(oRadius)
.innerRadius(iRadius);
// creates the pie chart container
var g = svg.append('g')
var g = svg.append('g')
.attr('transform', function(){
if ( window.innerWidth >= 960 ) var shiftWidth = width / 2;
if ( window.innerWidth < 960 ) var shiftWidth = width / 3;
return 'translate(' + shiftWidth + ',' + height / 2 + ')';
})
// generate random data
var data = makeData(+document.getElementById("datacount").value);
// enter data and draw pie chart
var path = g.datum(data).selectAll("path")
.data(pie)
.enter().append("path")
.attr("class","piechart")
.attr("fill", function(d,i){ return color(i); })
.attr("d", arc)
.each(function(d){ this._current = d; })
function render(){
// generate new random data
data = makeData(+document.getElementById("datacount").value);
// add transition to new path
g.datum(data).selectAll("path").data(pie).transition().duration(1000).attrTween("d", arcTween)
// add any new paths
g.datum(data).selectAll("path")
.data(pie)
.enter().append("path")
.attr("class","piechart")
.attr("fill", function(d,i){ return color(i); })
.attr("d", arc)
.each(function(d){ this._current = d; })
// remove data not being used
g.datum(data).selectAll("path")
.data(pie).exit().remove();
}
render();
setInterval(render,2000);
function makeData(size){
return d3.range(size).map(function(item){
return Math.random()*100;
});
};
// Store the displayed angles in _current.
// Then, interpolate from _current to the new angles.
// During the transition, _current is updated in-place by d3.interpolate.
function arcTween(a) {
var i = d3.interpolate(this._current, a);
this._current = i(0);
return function(t) {
return arc(i(t));
};
}
</script>
</body>
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