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Don't treat null values as zero for graduated symbology

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This commit is contained in:
Nyall Dawson 2013-03-04 12:36:00 +11:00
parent f91e79bcf1
commit f7bf3f2819
1 changed files with 10 additions and 2 deletions
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8
src/core/symbology-ng/qgsgraduatedsymbolrendererv2.cpp
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@ -192,6 +192,10 @@ QgsSymbolV2* QgsGraduatedSymbolRendererV2::symbolForFeature( QgsFeature& feature
return NULL; return NULL;
} }
// Null values should not be categorized
if ( attrs[mAttrNum] == "")
return NULL;
// find the right category // find the right category
QgsSymbolV2* symbol = symbolForValue( attrs[mAttrNum].toDouble() ); QgsSymbolV2* symbol = symbolForValue( attrs[mAttrNum].toDouble() );
if ( symbol == NULL ) if ( symbol == NULL )
@ -802,8 +806,12 @@ QgsGraduatedSymbolRendererV2* QgsGraduatedSymbolRendererV2::createRenderer(
lst.append( attrNum ); lst.append( attrNum );
QgsFeatureIterator fit = vlayer->getFeatures( QgsFeatureRequest().setFlags( QgsFeatureRequest::NoGeometry ).setSubsetOfAttributes( lst ) ); QgsFeatureIterator fit = vlayer->getFeatures( QgsFeatureRequest().setFlags( QgsFeatureRequest::NoGeometry ).setSubsetOfAttributes( lst ) );
// create list of non-null attribute values
while ( fit.nextFeature( f ) ) while ( fit.nextFeature( f ) )
if ( f.attribute( attrNum ) != "" )
values.append( f.attribute( attrNum ).toDouble() ); values.append( f.attribute( attrNum ).toDouble() );
// calculate the breaks // calculate the breaks
if ( mode == Quantile ) if ( mode == Quantile )
{ {