PostGIS  2.3.7dev-r@@SVN_REVISION@@
double ptarray_length ( const POINTARRAY pts)

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

Definition at line 1673 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().

1674 {
1675  double dist = 0.0;
1676  int i;
1677  POINT3DZ frm;
1678  POINT3DZ to;
1679 
1680  if ( pts->npoints < 2 ) return 0.0;
1681 
1682  /* compute 2d length if 3d is not available */
1683  if ( ! FLAGS_GET_Z(pts->flags) ) return ptarray_length_2d(pts);
1684 
1685  getPoint3dz_p(pts, 0, &frm);
1686  for ( i=1; i < pts->npoints; i++ )
1687  {
1688  getPoint3dz_p(pts, i, &to);
1689  dist += sqrt( ((frm.x - to.x)*(frm.x - to.x)) +
1690  ((frm.y - to.y)*(frm.y - to.y)) +
1691  ((frm.z - to.z)*(frm.z - to.z)) );
1692  frm = to;
1693  }
1694  return dist;
1695 }
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 'flags' byte.
Definition: liblwgeom.h:139
double ptarray_length_2d(const POINTARRAY *pts)
Find the 2d length of the given POINTARRAY (even if it's 3d)
Definition: ptarray.c:1645

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