# Can't find TikZ library calc

I've been googling for some time now, and can't find the manual for the TikZ library calc. All I see is people using it. Where can I find the manual or some info?

Is it the same as the LaTeX package calc? The latter doesn't seem to mention TikZ in the manual.

-
No not the same. The LaTeX one is included with \usepackage{calc}. You need to use \usetikzlibrary{calc} to do coordinate computations in TikZ, but I don't recall seeing a separate doc for it. See the TikZ-PGF manual for examples. – Peter Grill Mar 7 '12 at 22:34