QgsGeometry* QgsMapToolOffsetCurve::createOriginGeometry( QgsVectorLayer* vl, const QgsPointLocator::Match& match, QgsFeature& snappedFeature )
{
if ( !vl )
{
return 0;
}
mMultiPartGeometry = false;
//assign feature part by vertex number (snap to vertex) or by before vertex number (snap to segment)
int partVertexNr = match.vertexIndex();
if ( vl == currentVectorLayer() && !mForceCopy )
{
//don't consider selected geometries, only the snap result
return convertToSingleLine( snappedFeature.geometryAndOwnership(), partVertexNr, mMultiPartGeometry );
}
else //snapped to a background layer
{
//if source layer is polygon / multipolygon, create a linestring from the snapped ring
if ( vl->geometryType() == QGis::Polygon )
{
//make linestring from polygon ring and return this geometry
return linestringFromPolygon( snappedFeature.geometry(), partVertexNr );
}
//for background layers, try to merge selected entries together if snapped feature is contained in selection
const QgsFeatureIds& selection = vl->selectedFeaturesIds();
if ( selection.size() < 1 || !selection.contains( match.featureId() ) )
{
return convertToSingleLine( snappedFeature.geometryAndOwnership(), partVertexNr, mMultiPartGeometry );
}
else
{
//merge together if several features
QgsFeatureList selectedFeatures = vl->selectedFeatures();
QgsFeatureList::iterator selIt = selectedFeatures.begin();
QgsGeometry* geom = selIt->geometryAndOwnership();
++selIt;
for ( ; selIt != selectedFeatures.end(); ++selIt )
{
QgsGeometry* combined = geom->combine( selIt->geometry() );
delete geom;
geom = combined;
}
//if multitype, return only the snapped to geometry
if ( geom->isMultipart() )
{
delete geom;
return convertToSingleLine( snappedFeature.geometryAndOwnership(), match.vertexIndex(), mMultiPartGeometry );
}
return geom;
}
}
}
QgsGeometry* QgsMapToolOffsetCurve::createOriginGeometry( QgsVectorLayer* vl, const QgsPointLocator::Match& match, QgsFeature& snappedFeature )
{
if ( !vl )
{
return nullptr;
}
mMultiPartGeometry = false;
//assign feature part by vertex number (snap to vertex) or by before vertex number (snap to segment)
int partVertexNr = match.vertexIndex();
if ( vl == currentVectorLayer() && !mForceCopy )
{
Q_NOWARN_DEPRECATED_PUSH
//don't consider selected geometries, only the snap result
return convertToSingleLine( snappedFeature.geometryAndOwnership(), partVertexNr, mMultiPartGeometry );
Q_NOWARN_DEPRECATED_POP
}
