How to bubble chart aligned bottom and stick to ea

问题:

I would like to ask if there is a way to achieve the layout and arrangement of the circles on the image. I would like create a chart of series of circles that are link together and all aligned in the bottom.

回答1:

The distance between two circles with radii r1 and r2 is:

You can use this to position your circles on the x-axis. For an example see: http://bl.ocks.org/7a9d6c4725367aaed5db .