void SDTSLineReader::AttachToPolygons( SDTSTransfer * poTransfer,
int iTargetPolyLayer )
{
/* -------------------------------------------------------------------- */
/* We force a filling of the index because when we attach the */
/* lines we are just providing a pointer back to the line */
/* features in this readers index. If they aren't cached in */
/* the index then the pointer will be invalid. */
/* -------------------------------------------------------------------- */
FillIndex();
/* ==================================================================== */
/* Loop over all lines, attaching them to the polygons they */
/* have as right and left faces. */
/* ==================================================================== */
Rewind();
SDTSRawLine *poLine;
SDTSPolygonReader *poPolyReader = NULL;
while( (poLine = reinterpret_cast<SDTSRawLine *>( GetNextFeature()) )
!= NULL )
{
/* -------------------------------------------------------------------- */
/* Skip lines with the same left and right polygon face. These */
/* are dangles, and will not contribute in any useful fashion */
/* to the resulting polygon. */
/* -------------------------------------------------------------------- */
if( poLine->oLeftPoly.nRecord == poLine->oRightPoly.nRecord )
continue;
/* -------------------------------------------------------------------- */
/* If we don't have our indexed polygon reader yet, try to get */
/* it now. */
/* -------------------------------------------------------------------- */
if( poPolyReader == NULL )
{
int iPolyLayer = -1;
if( poLine->oLeftPoly.nRecord != -1 )
{
iPolyLayer = poTransfer->FindLayer(poLine->oLeftPoly.szModule);
}
else if( poLine->oRightPoly.nRecord != -1 )
{
iPolyLayer = poTransfer->FindLayer(poLine->oRightPoly.szModule);
}
if( iPolyLayer == -1 )
continue;
if( iPolyLayer != iTargetPolyLayer )
continue;
poPolyReader = reinterpret_cast<SDTSPolygonReader *>(
poTransfer->GetLayerIndexedReader(iPolyLayer) );
if( poPolyReader == NULL )
return;
}
/* -------------------------------------------------------------------- */
/* Attach line to right and/or left polygons. */
/* -------------------------------------------------------------------- */
if( poLine->oLeftPoly.nRecord != -1 )
{
SDTSRawPolygon *poPoly = reinterpret_cast<SDTSRawPolygon *>(
poPolyReader->GetIndexedFeatureRef( poLine->oLeftPoly.nRecord ) );
if( poPoly != NULL )
poPoly->AddEdge( poLine );
}
if( poLine->oRightPoly.nRecord != -1 )
{
SDTSRawPolygon *poPoly = reinterpret_cast<SDTSRawPolygon *>(
poPolyReader->GetIndexedFeatureRef(
poLine->oRightPoly.nRecord ) );
if( poPoly != NULL )
poPoly->AddEdge( poLine );
}
}
}
