The TikZ and PGF Packages
Manual for version 3.1.10
Libraries
46 Calc Library¶
-
TikZ Library calc
\usetikzlibrary{calc} %
LaTeX
and plain
TeX
\usetikzlibrary[calc] % ConTeXt
The library allows advanced Coordinate Calculations. It is documented in all detail in Section 13.5.