Created
October 25, 2011 00:20
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Simple sorting selection example
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Pie Chart</title> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.js?2.3.0"></script> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js?2.3.0"></script> | |
| <style type="text/css"> | |
| body { | |
| font: 10px sans-serif; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <p style="font-size:12pt;">Click in the box to bake a pie!<p> | |
| <script type="text/javascript"> | |
| var num = 7; | |
| var gradient = d3.scale.linear() | |
| .domain([ 0, num]) | |
| .interpolate(d3.interpolateRgb) | |
| .range(["#00ffaa", "#ff00aa"]) | |
| function bakepie(classname, data, x, y, r) | |
| { | |
| //color could be made a parameter | |
| var color = d3.scale.category10() | |
| var arc = d3.svg.arc() | |
| .innerRadius(r*.6) | |
| .outerRadius(r) | |
| var donut = d3.layout.pie() | |
| .sort(d3.descending); | |
| var pie = d3.select("#charts") | |
| .append("svg:g") | |
| //.data([data.sort(d3.descending)]) | |
| .data([data]) | |
| .attr("class", classname); | |
| var arcs = pie.selectAll("g.arc") | |
| .data(donut) | |
| .enter().append("svg:g") | |
| .attr("class", "arc") | |
| .attr("transform", "translate(" + x + "," + y + ")"); | |
| var paths = arcs.append("svg:path") | |
| .attr("fill", function(d, i) { return color(i); }) | |
| .attr("fill-opacity", .6) | |
| .attr("d", arc); | |
| //Make sure we select our arcs int he right order | |
| var selected = d3.selectAll("." + classname + " g.arc path") | |
| .sort(function(a,b) | |
| { | |
| //console.log(a) | |
| //console.log(b) | |
| return d3.descending(a.value, b.value); | |
| }) | |
| selected.attr("fill", function(d, i) { return gradient(i);}) | |
| } | |
| //setup svg canvas | |
| d3.select("body") | |
| .append("svg:svg") | |
| .attr("width", 900) | |
| .attr("height", 450) | |
| .attr("id", "charts") | |
| .on("click", clickypie) | |
| .append("svg:rect") | |
| .attr("width", "100%") | |
| .attr("height", "100%") | |
| .attr("stroke", "#000") | |
| .attr("stroke-width", 3) | |
| .attr("fill", "none") | |
| count = 0 | |
| function clickypie() | |
| { | |
| count += 1; | |
| //center the py at the position of the mouse click | |
| var xy = d3.svg.mouse(this); | |
| //radius is random between 50 and 150 | |
| var r = 50 + Math.random() * 100; | |
| //array of random values with num elements | |
| var data = d3.range(num) | |
| .map(Math.random) | |
| bakepie("pie"+count, data, xy[0], xy[1], r); | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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