PostGIS  2.2.8dev-r@@SVN_REVISION@@

◆ lwpoly_perimeter_2d()

double lwpoly_perimeter_2d ( const LWPOLY poly)

Compute the sum of polygon rings length (forcing 2d computation).

Could use a more numerically stable calculator...

Definition at line 462 of file lwpoly.c.

References LWDEBUGF, LWPOLY::nrings, ptarray_length_2d(), and LWPOLY::rings.

Referenced by lwgeom_perimeter_2d().

463 {
464  double result=0.0;
465  int i;
466 
467  LWDEBUGF(2, "in lwgeom_polygon_perimeter (%d rings)", poly->nrings);
468 
469  for (i=0; i<poly->nrings; i++)
470  result += ptarray_length_2d(poly->rings[i]);
471 
472  return result;
473 }
double ptarray_length_2d(const POINTARRAY *pts)
Find the 2d length of the given POINTARRAY (even if it&#39;s 3d)
Definition: ptarray.c:1645
POINTARRAY ** rings
Definition: liblwgeom.h:441
int nrings
Definition: liblwgeom.h:439
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:55
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