I'm continuting mbostocks's series of gists about pie charts.
Building on the previous version, this variation of a donut chart demonstrates a nice transition when the pie chart is drawn for the first time.
Last active
December 17, 2015 09:59
-
-
Save j0hnsmith/5591130 to your computer and use it in GitHub Desktop.
Pie Chart Update, IV
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; | |
| margin: auto; | |
| position: relative; | |
| width: 960px; | |
| } | |
| text { | |
| font: 10px sans-serif; | |
| } | |
| form { | |
| position: absolute; | |
| right: 10px; | |
| top: 10px; | |
| } | |
| </style> | |
| <form> | |
| <label><input type="radio" name="dataset" value="apples" checked> Apples</label> | |
| <label><input type="radio" name="dataset" value="oranges"> Oranges</label> | |
| </form> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var dataset = { | |
| apples: [53245, 28479, 19697, 24037, 40245], | |
| oranges: [200, 200, 200, 200] | |
| }; | |
| var width = 960, | |
| height = 500, | |
| radius = Math.min(width, height) / 2; | |
| var enterClockwise = { | |
| startAngle: 0, | |
| endAngle: 0 | |
| }; | |
| var enterAntiClockwise = { | |
| startAngle: Math.PI * 2, | |
| endAngle: Math.PI * 2 | |
| }; | |
| var color = d3.scale.category20(); | |
| var pie = d3.layout.pie() | |
| .sort(null); | |
| var arc = d3.svg.arc() | |
| .innerRadius(radius - 100) | |
| .outerRadius(radius - 20); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g") | |
| .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")"); | |
| // set the start and end angles to 0 so we can transition | |
| // clockwise to the actual values later | |
| var path = svg.selectAll("path") | |
| .data(pie(dataset.apples)) | |
| .enter().append("path") | |
| .attr("fill", function(d, i) { return color(i); }) | |
| .attr("d", arc(enterClockwise)) | |
| .each(function(d) { | |
| this._current = { | |
| data: d.data, | |
| value: d.value, | |
| startAngle: enterClockwise.startAngle, | |
| endAngle: enterClockwise.endAngle | |
| } | |
| }); // store the initial values | |
| path.transition() // update | |
| .duration(750) | |
| .attrTween("d", arcTween); | |
| d3.selectAll("input").on("change", change); | |
| var timeout = setTimeout(function() { | |
| d3.select("input[value=\"oranges\"]").property("checked", true).each(change); | |
| }, 2000); | |
| function change() { | |
| clearTimeout(timeout); | |
| path = path.data(pie(dataset[this.value])); // update the data | |
| // set the start and end angles to Math.PI * 2 so we can transition | |
| // anticlockwise to the actual values later | |
| path.enter().append("path") | |
| .attr("fill", function (d, i) { | |
| return color(i); | |
| }) | |
| .attr("d", arc(enterAntiClockwise)) | |
| .each(function (d) { | |
| this._current = { | |
| data: d.data, | |
| value: d.value, | |
| startAngle: enterAntiClockwise.startAngle, | |
| endAngle: enterAntiClockwise.endAngle | |
| }; | |
| }); // store the initial values | |
| path.exit() | |
| .transition() | |
| .duration(750) | |
| .attrTween('d', arcTweenOut) | |
| .remove() // now remove the exiting arcs | |
| path.transition().duration(750).attrTween("d", arcTween); // redraw the arcs | |
| } | |
| // 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)); | |
| }; | |
| } | |
| function arcTweenOut(a) { | |
| var i = d3.interpolate(this._current, {startAngle: Math.PI * 2, endAngle: Math.PI * 2, value: 0}); | |
| this._current = i(0); | |
| return function (t) { | |
| return arc(i(t)); | |
| }; | |
| } | |
| </script> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment