C++ (Cpp) QgsGeometryMap示例

示例#1

文件： qgsvectorlayerfeatureiterator.cpp 项目： jonnyforestGIS/QGIS

QgsVectorLayerFeatureSource::QgsVectorLayerFeatureSource( const QgsVectorLayer *layer )
{
  QMutexLocker locker( &layer->mFeatureSourceConstructorMutex );
  mProviderFeatureSource = layer->dataProvider()->featureSource();
  mFields = layer->fields();
  mId = layer->id();

  // update layer's join caches if necessary
  if ( layer->mJoinBuffer->containsJoins() )
    layer->mJoinBuffer->createJoinCaches();

  mJoinBuffer = layer->mJoinBuffer->clone();

  mExpressionFieldBuffer = new QgsExpressionFieldBuffer( *layer->mExpressionFieldBuffer );
  mCrs = layer->crs();

  mHasEditBuffer = layer->editBuffer();
  if ( mHasEditBuffer )
  {
#if 0
    // TODO[MD]: after merge
    if ( request.filterType() == QgsFeatureRequest::FilterFid )
    {

      // only copy relevant parts
      if ( L->editBuffer()->addedFeatures().contains( request.filterFid() ) )
        mAddedFeatures.insert( request.filterFid(), L->editBuffer()->addedFeatures()[ request.filterFid()] );

      if ( L->editBuffer()->changedGeometries().contains( request.filterFid() ) )
        mChangedGeometries.insert( request.filterFid(), L->editBuffer()->changedGeometries()[ request.filterFid()] );

      if ( L->editBuffer()->deletedFeatureIds().contains( request.filterFid() ) )
        mDeletedFeatureIds.insert( request.filterFid() );

      if ( L->editBuffer()->changedAttributeValues().contains( request.filterFid() ) )
        mChangedAttributeValues.insert( request.filterFid(), L->editBuffer()->changedAttributeValues()[ request.filterFid()] );

      if ( L->editBuffer()->changedAttributeValues().contains( request.filterFid() ) )
        mChangedFeaturesRequest.setFilterFids( QgsFeatureIds() << request.filterFid() );
    }
    else
    {
#endif
      mAddedFeatures = QgsFeatureMap( layer->editBuffer()->addedFeatures() );
      mChangedGeometries = QgsGeometryMap( layer->editBuffer()->changedGeometries() );
      mDeletedFeatureIds = QgsFeatureIds( layer->editBuffer()->deletedFeatureIds() );
      mChangedAttributeValues = QgsChangedAttributesMap( layer->editBuffer()->changedAttributeValues() );
      mAddedAttributes = QList<QgsField>( layer->editBuffer()->addedAttributes() );
      mDeletedAttributeIds = QgsAttributeList( layer->editBuffer()->deletedAttributeIds() );
#if 0
    }
#endif
  }

  std::unique_ptr< QgsExpressionContextScope > layerScope( QgsExpressionContextUtils::layerScope( layer ) );
  mLayerScope = *layerScope;
}

示例#2

文件： qgsvectorlayerfeatureiterator.cpp 项目： alexgleith/Quantum-GIS

QgsVectorLayerFeatureIterator::QgsVectorLayerFeatureIterator( QgsVectorLayer* layer, const QgsFeatureRequest& request )
    : QgsAbstractFeatureIterator( request ), L( layer )
{
  QgsVectorLayerJoinBuffer* joinBuffer = L->mJoinBuffer;

  if ( L->editBuffer() )
  {
    mAddedFeatures = QgsFeatureMap( L->editBuffer()->addedFeatures() );
    mChangedGeometries = QgsGeometryMap( L->editBuffer()->changedGeometries() );
    mDeletedFeatureIds = QgsFeatureIds( L->editBuffer()->deletedFeatureIds() );
    mChangedAttributeValues = QgsChangedAttributesMap( L->editBuffer()->changedAttributeValues() );
    mAddedAttributes = QList<QgsField>( L->editBuffer()->addedAttributes() );
    mDeletedAttributeIds = QgsAttributeList( L->editBuffer()->deletedAttributeIds() );
  }

  // prepare joins: may add more attributes to fetch (in order to allow join)
  if ( joinBuffer->containsJoins() )
    prepareJoins();

  // by default provider's request is the same
  mProviderRequest = mRequest;

  if ( mProviderRequest.flags() & QgsFeatureRequest::SubsetOfAttributes )
  {
    // prepare list of attributes to match provider fields
    QgsAttributeList providerSubset;
    QgsAttributeList subset = mProviderRequest.subsetOfAttributes();
    const QgsFields &pendingFields = L->pendingFields();
    int nPendingFields = pendingFields.count();
    for ( int i = 0; i < subset.count(); ++i )
    {
      int attrIndex = subset[i];
      if ( attrIndex < 0 || attrIndex >= nPendingFields ) continue;
      if ( L->pendingFields().fieldOrigin( attrIndex ) == QgsFields::OriginProvider )
        providerSubset << L->pendingFields().fieldOriginIndex( attrIndex );
    }
    mProviderRequest.setSubsetOfAttributes( providerSubset );
  }

  if ( request.filterType() == QgsFeatureRequest::FilterFid )
  {
    mFetchedFid = false;
  }
  else // no filter or filter by rect
  {
    mProviderIterator = L->dataProvider()->getFeatures( mProviderRequest );

    rewindEditBuffer();
  }
}

示例#3

文件： qgsvectorlayerfeatureiterator.cpp 项目： danylaksono/QGIS

QgsVectorLayerFeatureSource::QgsVectorLayerFeatureSource( QgsVectorLayer *layer )
    : mCrsId( 0 )
{
  mProviderFeatureSource = layer->dataProvider()->featureSource();
  mFields = layer->fields();
  mJoinBuffer = layer->mJoinBuffer->clone();
  mExpressionFieldBuffer = new QgsExpressionFieldBuffer( *layer->mExpressionFieldBuffer );
  mCrsId = layer->crs().srsid();

  mCanBeSimplified = layer->hasGeometryType() && layer->geometryType() != QGis::Point;

  mHasEditBuffer = layer->editBuffer();
  if ( mHasEditBuffer )
  {
#if 0
    // TODO[MD]: after merge
    if ( request.filterType() == QgsFeatureRequest::FilterFid )
    {

      // only copy relevant parts
      if ( L->editBuffer()->addedFeatures().contains( request.filterFid() ) )
        mAddedFeatures.insert( request.filterFid(), L->editBuffer()->addedFeatures()[ request.filterFid()] );

      if ( L->editBuffer()->changedGeometries().contains( request.filterFid() ) )
        mChangedGeometries.insert( request.filterFid(), L->editBuffer()->changedGeometries()[ request.filterFid()] );

      if ( L->editBuffer()->deletedFeatureIds().contains( request.filterFid() ) )
        mDeletedFeatureIds.insert( request.filterFid() );

      if ( L->editBuffer()->changedAttributeValues().contains( request.filterFid() ) )
        mChangedAttributeValues.insert( request.filterFid(), L->editBuffer()->changedAttributeValues()[ request.filterFid()] );

      if ( L->editBuffer()->changedAttributeValues().contains( request.filterFid() ) )
        mChangedFeaturesRequest.setFilterFids( QgsFeatureIds() << request.filterFid() );
    }
    else
    {
#endif
      mAddedFeatures = QgsFeatureMap( layer->editBuffer()->addedFeatures() );
      mChangedGeometries = QgsGeometryMap( layer->editBuffer()->changedGeometries() );
      mDeletedFeatureIds = QgsFeatureIds( layer->editBuffer()->deletedFeatureIds() );
      mChangedAttributeValues = QgsChangedAttributesMap( layer->editBuffer()->changedAttributeValues() );
      mAddedAttributes = QList<QgsField>( layer->editBuffer()->addedAttributes() );
      mDeletedAttributeIds = QgsAttributeList( layer->editBuffer()->deletedAttributeIds() );
#if 0
    }
#endif
  }
}