PostGIS  2.1.10dev-r@@SVN_REVISION@@
int lw_dist2d_pt_ptarray ( const POINT2D p,
POINTARRAY pa,
DISTPTS dl 
)

search all the segments of pointarray to see which one is closest to p1 Returns minimum distance between point and pointarray

Definition at line 1009 of file measures.c.

References DIST_MIN, DISTPTS::distance, getPoint2d_cp(), lw_dist2d_pt_pt(), lw_dist2d_pt_seg(), LW_FALSE, LW_TRUE, LWDEBUG, DISTPTS::mode, POINTARRAY::npoints, DISTPTS::tolerance, and DISTPTS::twisted.

Referenced by lw_dist2d_point_line(), and lw_dist2d_point_poly().

1010 {
1011  int t;
1012  const POINT2D *start, *end;
1013  int twist = dl->twisted;
1014 
1015  LWDEBUG(2, "lw_dist2d_pt_ptarray is called");
1016 
1017  start = getPoint2d_cp(pa, 0);
1018 
1019  if ( !lw_dist2d_pt_pt(p, start, dl) ) return LW_FALSE;
1020 
1021  for (t=1; t<pa->npoints; t++)
1022  {
1023  dl->twisted=twist;
1024  end = getPoint2d_cp(pa, t);
1025  if (!lw_dist2d_pt_seg(p, start, end, dl)) return LW_FALSE;
1026 
1027  if (dl->distance<=dl->tolerance && dl->mode == DIST_MIN) return LW_TRUE; /*just a check if the answer is already given*/
1028  start = end;
1029  }
1030 
1031  return LW_TRUE;
1032 }
int npoints
Definition: liblwgeom.h:327
int mode
Definition: measures.h:26
#define DIST_MIN
#define LWDEBUG(level, msg)
Definition: lwgeom_log.h:50
double tolerance
Definition: measures.h:28
#define LW_FALSE
Definition: liblwgeom.h:52
const POINT2D * getPoint2d_cp(const POINTARRAY *pa, int n)
Returns a POINT2D pointer into the POINTARRAY serialized_ptlist, suitable for reading from...
Definition: lwgeom_api.c:458
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:51
int lw_dist2d_pt_seg(const POINT2D *p, const POINT2D *A, const POINT2D *B, DISTPTS *dl)
lw_dist2d_comp from p to line A->B This one is now sending every occation to lw_dist2d_pt_pt Before i...
Definition: measures.c:2011
int twisted
Definition: measures.h:27
double distance
Definition: measures.h:23
int lw_dist2d_pt_pt(const POINT2D *thep1, const POINT2D *thep2, DISTPTS *dl)
Compares incomming points and stores the points closest to each other or most far away from each othe...
Definition: measures.c:2087

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