PostGIS  3.0.0dev-r@@SVN_REVISION@@

◆ _lwt_FirstDistinctVertex2D()

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

Definition at line 1394 of file lwgeom_topo.c.

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

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

1395 {
1396  int i, toofar, inc;
1397  POINT2D fp;
1398 
1399  if ( dir > 0 )
1400  {
1401  toofar = pa->npoints;
1402  inc = 1;
1403  }
1404  else
1405  {
1406  toofar = -1;
1407  inc = -1;
1408  }
1409 
1410  LWDEBUGF(1, "first point is index %d", from);
1411  fp = *ref; /* getPoint2d_p(pa, from, &fp); */
1412  for ( i = from+inc; i != toofar; i += inc )
1413  {
1414  LWDEBUGF(1, "testing point %d", i);
1415  getPoint2d_p(pa, i, op); /* pick next point */
1416  if ( p2d_same(op, &fp) ) continue; /* equal to startpoint */
1417  /* this is a good one, neither same of start nor of end point */
1418  return 1; /* found */
1419  }
1420 
1421  /* no distinct vertices found */
1422  return 0;
1423 }
int p2d_same(const POINT2D *p1, const POINT2D *p2)
Definition: lwalgorithm.c:49
int getPoint2d_p(const POINTARRAY *pa, uint32_t n, POINT2D *point)
Definition: lwgeom_api.c:337
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88
uint32_t npoints
Definition: liblwgeom.h:373
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