PostGIS  2.5.0dev-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 474 of file lwpoly.c.

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

Referenced by lwgeom_perimeter().

475 {
476  double result=0.0;
477  uint32_t i;
478 
479  LWDEBUGF(2, "in lwgeom_polygon_perimeter (%d rings)", poly->nrings);
480 
481  for (i=0; i<poly->nrings; i++)
482  result += ptarray_length(poly->rings[i]);
483 
484  return result;
485 }
double ptarray_length(const POINTARRAY *pts)
Find the 3d/2d length of the given POINTARRAY (depending on its dimensionality)
Definition: ptarray.c:1710
uint32_t nrings
Definition: liblwgeom.h:457
unsigned int uint32_t
Definition: uthash.h:78
POINTARRAY ** rings
Definition: liblwgeom.h:459
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88
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