Calculate the area of a polygon and its boundary direction.
matrix containing the
positive numeric, the area of the polygon.
integer, 1 if the polygon orientation is anticlockwise, -1 otherwise.
copy of the passed argument
This function is provided here so that users do not need to load other packages, as it is not available in the base R packages.
Joseph O'Rourke, Computational Geometry in C (2nd Edition), Cambridge University Press, 2000 edition.
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