PostGIS  2.5.0dev-r@@SVN_REVISION@@

◆ lw_dist3d_pt_ptarray()

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 and pointarray

Definition at line 714 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().

715 {
716  uint32_t t;
717  POINT3DZ start, end;
718  int twist = dl->twisted;
719 
720  LWDEBUG(2, "lw_dist3d_pt_ptarray is called");
721 
722  getPoint3dz_p(pa, 0, &start);
723 
724  for (t=1; t<pa->npoints; t++)
725  {
726  dl->twisted=twist;
727  getPoint3dz_p(pa, t, &end);
728  if (!lw_dist3d_pt_seg(p, &start, &end,dl)) return LW_FALSE;
729 
730  if (dl->distance<=dl->tolerance && dl->mode == DIST_MIN) return LW_TRUE; /*just a check if the answer is already given*/
731  start = end;
732  }
733 
734  return LW_TRUE;
735 }
double distance
Definition: measures3d.h:41
#define LWDEBUG(level, msg)
Definition: lwgeom_log.h:83
unsigned int uint32_t
Definition: uthash.h:78
#define DIST_MIN
Definition: measures.h:41
#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
int getPoint3dz_p(const POINTARRAY *pa, uint32_t n, POINT3DZ *point)
Definition: lwgeom_api.c:205
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:744
uint32_t npoints
Definition: liblwgeom.h:373
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