PostGIS  2.5.0dev-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 1682 of file ptarray.c.

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

Referenced by LWGEOM_line_substring(), 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().

1683 {
1684  double dist = 0.0;
1685  uint32_t i;
1686  const POINT2D *frm;
1687  const POINT2D *to;
1688 
1689  if ( pts->npoints < 2 ) return 0.0;
1690 
1691  frm = getPoint2d_cp(pts, 0);
1692 
1693  for ( i=1; i < pts->npoints; i++ )
1694  {
1695  to = getPoint2d_cp(pts, i);
1696 
1697  dist += sqrt( ((frm->x - to->x)*(frm->x - to->x)) +
1698  ((frm->y - to->y)*(frm->y - to->y)) );
1699 
1700  frm = to;
1701  }
1702  return dist;
1703 }
unsigned int uint32_t
Definition: uthash.h:78
double x
Definition: liblwgeom.h:330
double y
Definition: liblwgeom.h:330
const POINT2D * getPoint2d_cp(const POINTARRAY *pa, uint32_t n)
Returns a POINT2D pointer into the POINTARRAY serialized_ptlist, suitable for reading from...
Definition: lwgeom_api.c:364
uint32_t npoints
Definition: liblwgeom.h:373
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