PostGIS  2.1.10dev-r@@SVN_REVISION@@
double lwgeom_perimeter ( const LWGEOM geom)

Definition at line 1522 of file lwgeom.c.

References CURVEPOLYTYPE, LWCOLLECTION::geoms, lwcurvepoly_perimeter(), lwgeom_is_collection(), lwpoly_perimeter(), lwtriangle_perimeter(), LWCOLLECTION::ngeoms, POLYGONTYPE, TRIANGLETYPE, and LWGEOM::type.

Referenced by LWGEOM_perimeter_poly().

1523 {
1524  int type = geom->type;
1525  if ( type == POLYGONTYPE )
1526  return lwpoly_perimeter((LWPOLY*)geom);
1527  else if ( type == CURVEPOLYTYPE )
1528  return lwcurvepoly_perimeter((LWCURVEPOLY*)geom);
1529  else if ( type == TRIANGLETYPE )
1530  return lwtriangle_perimeter((LWTRIANGLE*)geom);
1531  else if ( lwgeom_is_collection(geom) )
1532  {
1533  double perimeter = 0.0;
1534  int i;
1535  LWCOLLECTION *col = (LWCOLLECTION*)geom;
1536  for ( i = 0; i < col->ngeoms; i++ )
1537  perimeter += lwgeom_perimeter(col->geoms[i]);
1538  return perimeter;
1539  }
1540  else
1541  return 0.0;
1542 }
#define POLYGONTYPE
Definition: liblwgeom.h:62
#define CURVEPOLYTYPE
Definition: liblwgeom.h:69
#define TRIANGLETYPE
Definition: liblwgeom.h:73
double lwtriangle_perimeter(const LWTRIANGLE *triangle)
Definition: lwtriangle.c:196
double lwgeom_perimeter(const LWGEOM *geom)
Definition: lwgeom.c:1522
LWGEOM ** geoms
Definition: liblwgeom.h:465
double lwpoly_perimeter(const LWPOLY *poly)
Compute the sum of polygon rings length.
Definition: lwpoly.c:423
double lwcurvepoly_perimeter(const LWCURVEPOLY *poly)
Definition: lwcurvepoly.c:134
int lwgeom_is_collection(const LWGEOM *geom)
Determine whether a LWGEOM can contain sub-geometries or not.
Definition: lwgeom.c:947
uint8_t type
Definition: liblwgeom.h:352

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