PostGIS  3.1.6dev-r@@SVN_REVISION@@

◆ ptarray_length_2d()

double ptarray_length_2d ( const POINTARRAY pts)

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

Definition at line 1757 of file ptarray.c.

1758 {
1759  double dist = 0.0;
1760  uint32_t i;
1761  const POINT2D *frm;
1762  const POINT2D *to;
1763 
1764  if ( pts->npoints < 2 ) return 0.0;
1765 
1766  frm = getPoint2d_cp(pts, 0);
1767 
1768  for ( i=1; i < pts->npoints; i++ )
1769  {
1770  to = getPoint2d_cp(pts, i);
1771 
1772  dist += sqrt( ((frm->x - to->x)*(frm->x - to->x)) +
1773  ((frm->y - to->y)*(frm->y - to->y)) );
1774 
1775  frm = to;
1776  }
1777  return dist;
1778 }
static const POINT2D * getPoint2d_cp(const POINTARRAY *pa, uint32_t n)
Returns a POINT2D pointer into the POINTARRAY serialized_ptlist, suitable for reading from.
Definition: lwinline.h:101
double y
Definition: liblwgeom.h:404
double x
Definition: liblwgeom.h:404
uint32_t npoints
Definition: liblwgeom.h:441

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

Referenced by LWGEOM_line_substring(), lwline_crossing_direction(), lwline_interpolate_points(), 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().

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