PostGIS  2.5.1dev-r@@SVN_REVISION@@

## ◆ lw_dist3d_pt_poly()

 int lw_dist3d_pt_poly ( POINT3DZ * p, LWPOLY * poly, PLANE3D * plane, POINT3DZ * projp, DISTPTS3D * dl )

Checking if the point projected on the plane of the polygon actually is inside that polygon.

If so the mindistance is between that projected point and our original point. If not we check from original point to the boundary. If the projected point is inside a hole of the polygon we check the distance to the boundary of that hole.

Definition at line 1017 of file measures3d.c.

Referenced by lw_dist3d_point_poly(), and lw_dist3d_ptarray_poly().

1018 {
1019  uint32_t i;
1020
1021  LWDEBUG(2, "lw_dist3d_point_poly called");
1022
1023
1024  if(pt_in_ring_3d(projp, poly->rings[0], plane))
1025  {
1026  for (i=1; i<poly->nrings; i++)
1027  {
1028  /* Inside a hole. Distance = pt -> ring */
1029  if ( pt_in_ring_3d(projp, poly->rings[i], plane ))
1030  {
1031  LWDEBUG(3, " inside an hole");
1032  return lw_dist3d_pt_ptarray(p, poly->rings[i], dl);
1033  }
1034  }
1035
1036  return lw_dist3d_pt_pt(p,projp,dl);/* If the projected point is inside the polygon the shortest distance is between that point and the inputed point*/
1037  }
1038  else
1039  {
1040  return lw_dist3d_pt_ptarray(p, poly->rings[0], dl); /*If the projected point is outside the polygon we search for the closest distance against the boundary instead*/
1041  }
1042
1043  return LW_TRUE;
1044
1045 }
#define LWDEBUG(level, msg)
Definition: lwgeom_log.h:83
uint32_t nrings
Definition: liblwgeom.h:457
unsigned int uint32_t
Definition: uthash.h:78
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:75
int lw_dist3d_pt_pt(POINT3DZ *thep1, POINT3DZ *thep2, DISTPTS3D *dl)
Compares incoming points and stores the points closest to each other or most far away from each other...
Definition: measures3d.c:809
POINTARRAY ** rings
Definition: liblwgeom.h:459
int pt_in_ring_3d(const POINT3DZ *p, const POINTARRAY *ring, PLANE3D *plane)
pt_in_ring_3d(): crossing number test for a point in a polygon input: p = a point, pa = vertex points of a ring V[n+1] with V[n]=V[0] plane=the plane that the vertex points are lying on returns: 0 = outside, 1 = inside
Definition: measures3d.c:1238
int lw_dist3d_pt_ptarray(POINT3DZ *p, POINTARRAY *pa, DISTPTS3D *dl)
search all the segments of pointarray to see which one is closest to p Returns distance between point...
Definition: measures3d.c:714
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