PostGIS  2.5.1dev-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 1689 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().

1690 {
1691  double dist = 0.0;
1692  uint32_t i;
1693  const POINT2D *frm;
1694  const POINT2D *to;
1695 
1696  if ( pts->npoints < 2 ) return 0.0;
1697 
1698  frm = getPoint2d_cp(pts, 0);
1699 
1700  for ( i=1; i < pts->npoints; i++ )
1701  {
1702  to = getPoint2d_cp(pts, i);
1703 
1704  dist += sqrt( ((frm->x - to->x)*(frm->x - to->x)) +
1705  ((frm->y - to->y)*(frm->y - to->y)) );
1706 
1707  frm = to;
1708  }
1709  return dist;
1710 }
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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