_lwt_FirstDistinctVertex2D()

static int _lwt_FirstDistinctVertex2D ( const POINTARRAY *  pa, POINT2D *  ref, int  from, int  dir, POINT2D *  op  )

static

Definition at line 1425 of file lwgeom_topo.c.

{
  int i, toofar, inc;
  POINT2D fp;
 
  if ( dir > 0 )
  {
    toofar = pa->npoints;
    inc = 1;
  }
  else
  {
    toofar = -1;
    inc = -1;
  }
 
  LWDEBUGF(1, "first point is index %d", from);
  fp = *ref; /* getPoint2d_p(pa, from, &fp); */
  for ( i = from+inc; i != toofar; i += inc )
  {
    LWDEBUGF(1, "testing point %d", i);
    getPoint2d_p(pa, i, op); /* pick next point */
    if ( p2d_same(op, &fp) ) continue; /* equal to startpoint */
    /* this is a good one, neither same of start nor of end point */
    return 1; /* found */
  }
 
  /* no distinct vertices found */
  return 0;
}

References getPoint2d_p(), LWDEBUGF, POINTARRAY::npoints, and p2d_same().

Referenced by _lwt_AddEdge(), _lwt_FindAdjacentEdges(), and _lwt_InitEdgeEndByLine().

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