PostGIS  2.3.8dev-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 1680 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().

1681 {
1682  double dist = 0.0;
1683  int i;
1684  POINT3DZ frm;
1685  POINT3DZ to;
1686 
1687  if ( pts->npoints < 2 ) return 0.0;
1688 
1689  /* compute 2d length if 3d is not available */
1690  if ( ! FLAGS_GET_Z(pts->flags) ) return ptarray_length_2d(pts);
1691 
1692  getPoint3dz_p(pts, 0, &frm);
1693  for ( i=1; i < pts->npoints; i++ )
1694  {
1695  getPoint3dz_p(pts, i, &to);
1696  dist += sqrt( ((frm.x - to.x)*(frm.x - to.x)) +
1697  ((frm.y - to.y)*(frm.y - to.y)) +
1698  ((frm.z - to.z)*(frm.z - to.z)) );
1699  frm = to;
1700  }
1701  return dist;
1702 }
double z
Definition: liblwgeom.h:333
double y
Definition: liblwgeom.h:333
double x
Definition: liblwgeom.h:333
int npoints
Definition: liblwgeom.h:370
int getPoint3dz_p(const POINTARRAY *pa, int n, POINT3DZ *point)
Definition: lwgeom_api.c:332
uint8_t flags
Definition: liblwgeom.h:368
#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:1652
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