# Functions
Function Area returns the area of a polygon, or the combined area of a MultiPolygon, assuming that none of the polygons in the MultiPolygon overlap and that nested polygons have alternating winding directions.
Calculate the centroid of a polygon, from wikipedia: http://en.wikipedia.org/wiki/Centroid#Centroid_of_polygon.
Clone returns a duplicate of a polygon.
Distance returns the distance between the closest parts of two geometries.
Change the winding direction of the outer and inner rings so the outer ring is counter-clockwise and nesting rings alternate directions.
Function Length returns the length of a LineString, or the combined length of a MultiLineString.
Equals returns true if both p1 and p2 describe the same point within a tolerance limit.
Function PointOnSurface returns a point guaranteed to lie on the surface of the shape.
Within checks whether inner is within outer.
# Constants
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# Structs
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# Type aliases
Op describes an operation which can be performed on two polygons.