PostGIS  2.2.8dev-r@@SVN_REVISION@@

◆ lwpoly_perimeter()

double lwpoly_perimeter ( const LWPOLY poly)

Compute the sum of polygon rings length.

Could use a more numerically stable calculator...

Definition at line 444 of file lwpoly.c.

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

Referenced by lwgeom_perimeter().

445 {
446  double result=0.0;
447  int i;
449  LWDEBUGF(2, "in lwgeom_polygon_perimeter (%d rings)", poly->nrings);
451  for (i=0; i<poly->nrings; i++)
452  result += ptarray_length(poly->rings[i]);
454  return result;
455 }
Definition: liblwgeom.h:441
int nrings
Definition: liblwgeom.h:439
double ptarray_length(const POINTARRAY *pts)
Find the 3d/2d length of the given POINTARRAY (depending on its dimensionality)
Definition: ptarray.c:1673
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:55
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