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径向面积生成器→d3.radialArea，它构造出的函数用于生成径向面积的路径字符串(path标签的d属性值)。
var data = [{innerRadius:50, outerRadius:100, angle:0},{innerRadius:50, outerRadius:100, angle:per},{innerRadius:50, outerRadius:100, angle:2*per},{innerRadius:50, outerRadius:100, angle:3*per},{innerRadius:50, outerRadius:100, angle:4*per},{innerRadius:50, outerRadius:100, angle:5*per},{innerRadius:50, outerRadius:100, angle:6*per},{innerRadius:50, outerRadius:100, angle:7*per},{innerRadius:50, outerRadius:100, angle:8*per}];
var radialArea = d3.radialArea().angle(function (d) {return d.angle;}).innerRadius(function(d){return d.innerRadius;}).outerRadius(function(d){return d.outerRadius;});
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原文地址：http://www.cnblogs.com/yaoyinglong/p/5906613.html
