PostGIS  2.1.10dev-r@@SVN_REVISION@@
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 441 of file lwpoly.c.

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

Referenced by lwgeom_perimeter_2d().

442 {
443  double result=0.0;
444  int i;
445 
446  LWDEBUGF(2, "in lwgeom_polygon_perimeter (%d rings)", poly->nrings);
447 
448  for (i=0; i<poly->nrings; i++)
449  result += ptarray_length_2d(poly->rings[i]);
450 
451  return result;
452 }
double ptarray_length_2d(const POINTARRAY *pts)
Find the 2d length of the given POINTARRAY (even if it's 3d)
Definition: ptarray.c:1586
char ** result
Definition: liblwgeom.h:218
POINTARRAY ** rings
Definition: liblwgeom.h:413
int nrings
Definition: liblwgeom.h:411
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:55

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