d3.js能画出这样的堆积密度图吗?

Is it possible to draw a stacked density graph like this one in d3.js?

是否可以在d3.js中绘制像这样的堆叠密度图?

参考:http://www.wired.com/2010/11/ff_311_new_york/

是的,确实如此。 d3.layout.stack 是你要找的:

http://bl.ocks.org/mbostock/4060954