PostGIS  2.2.7dev-r@@SVN_REVISION@@
double ptarray_length_2d ( const POINTARRAY pts)

Find the 2d length of the given POINTARRAY (even if it's 3d)

Definition at line 1645 of file ptarray.c.

References getPoint2d_cp(), POINTARRAY::npoints, POINT2D::x, and POINT2D::y.

Referenced by LWGEOM_line_interpolate_point(), LWGEOM_line_substring(), lwline_length_2d(), lwline_measured_from_lwline(), lwmline_measured_from_lwmline(), lwpoly_perimeter_2d(), lwtriangle_perimeter_2d(), ptarray_length(), ptarray_locate_point(), and ptarray_substring().

1646 {
1647  double dist = 0.0;
1648  int i;
1649  const POINT2D *frm;
1650  const POINT2D *to;
1651 
1652  if ( pts->npoints < 2 ) return 0.0;
1653 
1654  frm = getPoint2d_cp(pts, 0);
1655 
1656  for ( i=1; i < pts->npoints; i++ )
1657  {
1658  to = getPoint2d_cp(pts, i);
1659 
1660  dist += sqrt( ((frm->x - to->x)*(frm->x - to->x)) +
1661  ((frm->y - to->y)*(frm->y - to->y)) );
1662 
1663  frm = to;
1664  }
1665  return dist;
1666 }
int npoints
Definition: liblwgeom.h:355
double x
Definition: liblwgeom.h:312
const POINT2D * getPoint2d_cp(const POINTARRAY *pa, int n)
Returns a POINT2D pointer into the POINTARRAY serialized_ptlist, suitable for reading from...
Definition: lwgeom_api.c:472
double y
Definition: liblwgeom.h:312

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