any lib to generatre treemap?

[oyster]

I want to visualize my disk space like
http://www.werkema.com/img/scrnshot/spacemonger.gif. ie. draw the directory
as a big rectangle and its size is proportionable to the file size under
this directory, then draw and fill small rectangles into it to behalf the
size of every files. Is there a lib/src to do so?
Or more generally, any lib to draw a list of list
[code]
this is a list of list
[
    [dir1, files1],
 ......
    [dirN, filesN],
]
[/code]
to a treemap?

thanx
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