判断一个点是否在面域上的边上）， double dMinDist = 1;

admin1

int isPointOnRegion( bool& bIsOn, AcGePoint3d pt,AcDbObjectId regionId,double dMinDist )
{
Acad::ErrorStatus es;
bIsOn = false ;

AcDbRegion* pRegion ;
es = acdbOpenObject( pRegion, regionId, AcDb::kForRead );
if( es ) return 1;

AcDbVoidPtrArray entitySet;
es = pRegion->explode( entitySet );
pRegion->close();
if ( es )
{
  return 2;
}


for ( int i = 0; i < entitySet.length() ; i ++ )
{
  if(!((AcDbEntity*)entitySet[i])->isKindOf(AcDbCurve::desc())) continue;

  AcDbCurve *pCurve = ((AcDbCurve*&)entitySet[i]);
  if ( pCurve == NULL )
  {
   continue;
  }

  // 清空
  if( bIsOn )
  {
   delete pCurve;
   continue;
  }

  AcGePoint3d ptOn;
  es = pCurve->getClosestPointTo( pt, ptOn );
  if ( es )
  {
   delete pCurve ;
   return 3 ;
  }
  delete pCurve ;
  pt.z = ptOn.z = 0;

  if ( pt.distanceTo( ptOn ) <= dMinDist )
  {
   bIsOn = true ;
   break ;
   }
}


return 0;
}