OGRDWGLayer::OGRDWGLayer( OGRDWGDataSource *poDSIn )
{
this->poDS = poDSIn;
iNextFID = 0;
poFeatureDefn = new OGRFeatureDefn( "entities" );
SetDescription( poFeatureDefn->GetName() );
poFeatureDefn->Reference();
poDS->AddStandardFields( poFeatureDefn );
if( !poDS->InlineBlocks() )
{
OGRFieldDefn oScaleField( "BlockScale", OFTRealList );
poFeatureDefn->AddFieldDefn( &oScaleField );
OGRFieldDefn oBlockAngleField( "BlockAngle", OFTReal );
poFeatureDefn->AddFieldDefn( &oBlockAngleField );
}
/* -------------------------------------------------------------------- */
/* Find the *Paper_Space block, which seems to contain all the */
/* regular entities. */
/* -------------------------------------------------------------------- */
OdDbBlockTablePtr pTable = poDS->GetDB()->getBlockTableId().safeOpenObject();
OdDbSymbolTableIteratorPtr pBlkIter = pTable->newIterator();
for (pBlkIter->start(); ! pBlkIter->done(); pBlkIter->step())
{
m_poBlock = pBlkIter->getRecordId().safeOpenObject();
if( EQUAL(m_poBlock->getName(),"*Model_Space") )
break;
else
m_poBlock = NULL;
}
ResetReading();
}
void OGRDWGDataSource::ReadBlocksSection()
{
OGRDWGLayer *poReaderLayer = (OGRDWGLayer *) GetLayerByName( "Entities" );
int bMergeBlockGeometries = CSLTestBoolean(
CPLGetConfigOption( "DWG_MERGE_BLOCK_GEOMETRIES", "TRUE" ) );
/* -------------------------------------------------------------------- */
/* Loop over all the block tables, skipping *Model_Space which */
/* we assume is primary entities. */
/* -------------------------------------------------------------------- */
OdDbBlockTableRecordPtr poModelSpace, poBlock;
OdDbBlockTablePtr pTable = GetDB()->getBlockTableId().safeOpenObject();
OdDbSymbolTableIteratorPtr pBlkIter = pTable->newIterator();
for (pBlkIter->start(); ! pBlkIter->done(); pBlkIter->step())
{
poBlock = pBlkIter->getRecordId().safeOpenObject();
CPLString osBlockName = (const char *) poBlock->getName();
if( EQUAL(osBlockName,"*Model_Space") )
{
poModelSpace = poBlock;
continue;
}
poReaderLayer->SetBlockTable( poBlock );
// Now we will process entities till we run out.
// We aggregate the geometries of the features into a multi-geometry,
// but throw away other stuff attached to the features.
OGRFeature *poFeature;
OGRGeometryCollection *poColl = new OGRGeometryCollection();
std::vector<OGRFeature*> apoFeatures;
while( (poFeature = poReaderLayer->GetNextUnfilteredFeature()) != NULL )
{
if( (poFeature->GetStyleString() != NULL
&& strstr(poFeature->GetStyleString(),"LABEL") != NULL)
|| !bMergeBlockGeometries )
{
apoFeatures.push_back( poFeature );
}
else
{
poColl->addGeometryDirectly( poFeature->StealGeometry() );
delete poFeature;
}
}
if( poColl->getNumGeometries() == 0 )
delete poColl;
else
oBlockMap[osBlockName].poGeometry = SimplifyBlockGeometry(poColl);
if( apoFeatures.size() > 0 )
oBlockMap[osBlockName].apoFeatures = apoFeatures;
}
CPLDebug( "DWG", "Read %d blocks with meaningful geometry.",
(int) oBlockMap.size() );
poReaderLayer->SetBlockTable( poModelSpace );
}