PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ lw_dist3d_pt_ptarray()

int lw_dist3d_pt_ptarray ( POINT3DZ p,

search all the segments of pointarray to see which one is closest to p Returns distance between point and pointarray

Definition at line 717 of file measures3d.c.

References DIST_MIN, DISTPTS3D::distance, getPoint3dz_p(), lw_dist3d_pt_seg(), LW_FALSE, LW_TRUE, LWDEBUG, DISTPTS3D::mode, POINTARRAY::npoints, DISTPTS3D::tolerance, and DISTPTS3D::twisted.

Referenced by lw_dist3d_point_line(), lw_dist3d_point_poly(), and lw_dist3d_pt_poly().

718 {
719  int t;
720  POINT3DZ start, end;
721  int twist = dl->twisted;
723  LWDEBUG(2, "lw_dist3d_pt_ptarray is called");
725  getPoint3dz_p(pa, 0, &start);
727  for (t=1; t<pa->npoints; t++)
728  {
729  dl->twisted=twist;
730  getPoint3dz_p(pa, t, &end);
731  if (!lw_dist3d_pt_seg(p, &start, &end,dl)) return LW_FALSE;
733  if (dl->distance<=dl->tolerance && dl->mode == DIST_MIN) return LW_TRUE; /*just a check if the answer is already given*/
734  start = end;
735  }
737  return LW_TRUE;
738 }
double distance
Definition: measures3d.h:41
int npoints
Definition: liblwgeom.h:370
#define LWDEBUG(level, msg)
Definition: lwgeom_log.h:83
#define DIST_MIN
Definition: measures.h:41
int getPoint3dz_p(const POINTARRAY *pa, int n, POINT3DZ *point)
Definition: lwgeom_api.c:332
#define LW_FALSE
Definition: liblwgeom.h:76
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:75
int twisted
Definition: measures3d.h:45
int mode
Definition: measures3d.h:44
double tolerance
Definition: measures3d.h:46
int lw_dist3d_pt_seg(POINT3DZ *p, POINT3DZ *A, POINT3DZ *B, DISTPTS3D *dl)
If searching for min distance, this one finds the closest point on segment A-B from p...
Definition: measures3d.c:747
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