PostGIS  3.0.0dev-r@@SVN_REVISION@@

◆ ptarray_length()

double ptarray_length ( const POINTARRAY pts)

Find the 3d/2d length of the given POINTARRAY (depending on its dimensionality)

Definition at line 1704 of file ptarray.c.

References POINTARRAY::flags, FLAGS_GET_Z, getPoint3dz_p(), POINTARRAY::npoints, ptarray_length_2d(), POINT3DZ::x, POINT3DZ::y, and POINT3DZ::z.

Referenced by lwline_length(), lwpoly_perimeter(), and lwtriangle_perimeter().

1705 {
1706  double dist = 0.0;
1707  uint32_t i;
1708  POINT3DZ frm;
1709  POINT3DZ to;
1710 
1711  if ( pts->npoints < 2 ) return 0.0;
1712 
1713  /* compute 2d length if 3d is not available */
1714  if ( ! FLAGS_GET_Z(pts->flags) ) return ptarray_length_2d(pts);
1715 
1716  getPoint3dz_p(pts, 0, &frm);
1717  for ( i=1; i < pts->npoints; i++ )
1718  {
1719  getPoint3dz_p(pts, i, &to);
1720  dist += sqrt( ((frm.x - to.x)*(frm.x - to.x)) +
1721  ((frm.y - to.y)*(frm.y - to.y)) +
1722  ((frm.z - to.z)*(frm.z - to.z)) );
1723  frm = to;
1724  }
1725  return dist;
1726 }
double z
Definition: liblwgeom.h:336
double y
Definition: liblwgeom.h:336
double x
Definition: liblwgeom.h:336
unsigned int uint32_t
Definition: uthash.h:78
uint8_t flags
Definition: liblwgeom.h:371
#define FLAGS_GET_Z(flags)
Macros for manipulating the &#39;flags&#39; byte.
Definition: liblwgeom.h:139
double ptarray_length_2d(const POINTARRAY *pts)
Find the 2d length of the given POINTARRAY (even if it&#39;s 3d)
Definition: ptarray.c:1676
int getPoint3dz_p(const POINTARRAY *pa, uint32_t n, POINT3DZ *point)
Definition: lwgeom_api.c:204
uint32_t npoints
Definition: liblwgeom.h:373
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