PostGIS  2.3.7dev-r@@SVN_REVISION@@
int lw_dist3d_ptarray_ptarray ( POINTARRAY l1,
POINTARRAY l2,
DISTPTS3D dl 
)

Finds all combinationes of segments between two pointarrays.

Definition at line 844 of file measures3d.c.

References DIST_MAX, DIST_MIN, DISTPTS3D::distance, getPoint3dz_p(), lw_dist3d_pt_pt(), lw_dist3d_seg_seg(), LW_TRUE, LWDEBUGF, DISTPTS3D::mode, POINTARRAY::npoints, DISTPTS3D::tolerance, and DISTPTS3D::twisted.

Referenced by lw_dist3d_line_line(), lw_dist3d_line_poly(), lw_dist3d_poly_poly(), and lw_dist3d_ptarray_poly().

845 {
846  int t,u;
847  POINT3DZ start, end;
848  POINT3DZ start2, end2;
849  int twist = dl->twisted;
850  LWDEBUGF(2, "lw_dist3d_ptarray_ptarray called (points: %d-%d)",l1->npoints, l2->npoints);
851 
852 
853 
854  if (dl->mode == DIST_MAX)/*If we are searching for maxdistance we go straight to point-point calculation since the maxdistance have to be between two vertexes*/
855  {
856  for (t=0; t<l1->npoints; t++) /*for each segment in L1 */
857  {
858  getPoint3dz_p(l1, t, &start);
859  for (u=0; u<l2->npoints; u++) /*for each segment in L2 */
860  {
861  getPoint3dz_p(l2, u, &start2);
862  lw_dist3d_pt_pt(&start,&start2,dl);
863  LWDEBUGF(4, "maxdist_ptarray_ptarray; seg %i * seg %i, dist = %g\n",t,u,dl->distance);
864  LWDEBUGF(3, " seg%d-seg%d dist: %f, mindist: %f",
865  t, u, dl->distance, dl->tolerance);
866  }
867  }
868  }
869  else
870  {
871  getPoint3dz_p(l1, 0, &start);
872  for (t=1; t<l1->npoints; t++) /*for each segment in L1 */
873  {
874  getPoint3dz_p(l1, t, &end);
875  getPoint3dz_p(l2, 0, &start2);
876  for (u=1; u<l2->npoints; u++) /*for each segment in L2 */
877  {
878  getPoint3dz_p(l2, u, &end2);
879  dl->twisted=twist;
880  lw_dist3d_seg_seg(&start, &end, &start2, &end2,dl);
881  LWDEBUGF(4, "mindist_ptarray_ptarray; seg %i * seg %i, dist = %g\n",t,u,dl->distance);
882  LWDEBUGF(3, " seg%d-seg%d dist: %f, mindist: %f",
883  t, u, dl->distance, dl->tolerance);
884  if (dl->distance<=dl->tolerance && dl->mode == DIST_MIN) return LW_TRUE; /*just a check if the answer is already given*/
885  start2 = end2;
886  }
887  start = end;
888  }
889  }
890  return LW_TRUE;
891 }
double distance
Definition: measures3d.h:41
int npoints
Definition: liblwgeom.h:370
int lw_dist3d_seg_seg(POINT3DZ *s1p1, POINT3DZ *s1p2, POINT3DZ *s2p1, POINT3DZ *s2p2, DISTPTS3D *dl)
Finds the two closest points on two linesegments.
Definition: measures3d.c:898
#define DIST_MIN
Definition: measures.h:41
int getPoint3dz_p(const POINTARRAY *pa, int n, POINT3DZ *point)
Definition: lwgeom_api.c:332
#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 incomming points and stores the points closest to each other or most far away from each othe...
Definition: measures3d.c:812
int twisted
Definition: measures3d.h:45
int mode
Definition: measures3d.h:44
double tolerance
Definition: measures3d.h:46
#define DIST_MAX
Definition: measures.h:40
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88

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