bool QgsVectorLayerEditUtils::deleteVertex( QgsFeatureId atFeatureId, int atVertex )
{
if ( !L->hasGeometryType() )
return false;
QgsGeometry geometry;
if ( !cache()->geometry( atFeatureId, geometry ) )
{
// it's not in cache: let's fetch it from layer
QgsFeature f;
if ( !L->getFeatures( QgsFeatureRequest().setFilterFid( atFeatureId ).setSubsetOfAttributes( QgsAttributeList() ) ).nextFeature( f ) || !f.constGeometry() )
return false; // geometry not found
geometry = *f.constGeometry();
}
if ( !geometry.deleteVertex( atVertex ) )
return false;
if ( geometry.geometry() && geometry.geometry()->nCoordinates() == 0 )
{
//last vertex deleted, set geometry to null
geometry.setGeometry( 0 );
}
L->editBuffer()->changeGeometry( atFeatureId, &geometry );
return true;
}
QgsVectorLayer::EditResult QgsVectorLayerEditUtils::deleteVertexV2( QgsFeatureId featureId, int vertex )
{
if ( !L->hasGeometryType() )
return QgsVectorLayer::InvalidLayer;
QgsGeometry geometry;
if ( !cache()->geometry( featureId, geometry ) )
{
// it's not in cache: let's fetch it from layer
QgsFeature f;
if ( !L->getFeatures( QgsFeatureRequest().setFilterFid( featureId ).setSubsetOfAttributes( QgsAttributeList() ) ).nextFeature( f ) || !f.hasGeometry() )
return QgsVectorLayer::FetchFeatureFailed; // geometry not found
geometry = f.geometry();
}
if ( !geometry.deleteVertex( vertex ) )
return QgsVectorLayer::EditFailed;
if ( geometry.geometry() && geometry.geometry()->nCoordinates() == 0 )
{
//last vertex deleted, set geometry to null
geometry.setGeometry( nullptr );
}
L->editBuffer()->changeGeometry( featureId, geometry );
return !geometry.isEmpty() ? QgsVectorLayer::Success : QgsVectorLayer::EmptyGeometry;
}
void testEmptyGeometries()
{
QgsVectorLayer *vlEmptyGeom = new QgsVectorLayer( "Polygon", "x", "memory" );
QgsFeature ff( 0 );
QgsGeometry g;
g.setGeometry( new QgsPolygonV2() );
ff.setGeometry( g );
QgsFeatureList flist;
flist << ff;
vlEmptyGeom->dataProvider()->addFeatures( flist );
QgsPointLocator loc( vlEmptyGeom, QgsCoordinateReferenceSystem(), nullptr );
QgsPointLocator::Match m1 = loc.nearestVertex( QgsPointXY( 2, 2 ), std::numeric_limits<double>::max() );
QVERIFY( !m1.isValid() );
QgsPointLocator::Match m2 = loc.nearestEdge( QgsPointXY( 2, 2 ), std::numeric_limits<double>::max() );
QVERIFY( !m2.isValid() );
delete vlEmptyGeom;
}