_lwt_toposnap()

static LWGEOM* _lwt_toposnap ( LWGEOM *  src, LWGEOM *  tgt, double  tol  )

static

Definition at line 414 of file lwgeom_topo.c.

{
  LWGEOM *tmp = src;
  LWGEOM *tmp2;
  int changed;
  int iterations = 0;
 
  int maxiterations = lwgeom_count_vertices(tgt);
 
  /* GEOS snapping can be unstable */
  /* See https://trac.osgeo.org/geos/ticket/760 */
  do {
    tmp2 = lwgeom_snap(tmp, tgt, tol);
    ++iterations;
    changed = ( lwgeom_count_vertices(tmp2) != lwgeom_count_vertices(tmp) );
    LWDEBUGF(2, "After iteration %d, geometry changed ? %d (%d vs %d vertices)", iterations, changed, lwgeom_count_vertices(tmp2), lwgeom_count_vertices(tmp));
    if ( tmp != src ) lwgeom_free(tmp);
    tmp = tmp2;
  } while ( changed && iterations <= maxiterations );
 
  LWDEBUGF(1, "It took %d/%d iterations to properly snap",
              iterations, maxiterations);
 
  return tmp;
}

References LWDEBUGF, lwgeom_count_vertices(), lwgeom_free(), and lwgeom_snap().

Referenced by _lwt_AddLine(), and _lwt_AddPoint().

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