pole_in_poly.c File Reference

#include <grass/gis.h>

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Functions
int	G_pole_in_polygon (const double *x, const double *y, int n)
	pole in polygon More...

Function Documentation

int G_pole_in_polygon	(	const double *	x,
		const double *	y,
		int	n
	)

pole in polygon

For latitude-longitude coordinates, this routine determines if the polygon defined by the n coordinate vertices x,y contains one of the poles. Returns -1 if it contains the south pole; 1 if it contains the north pole; 0 if it contains neither pole. Note. Use this routine only if the projection is PROJECTION_LL.

Parameters

x
y
n

Returns

int

Definition at line 38 of file pole_in_poly.c.

References n.