C++ (Cpp) QgsSymbolV2::usedAttributes Examples

Example #1

File: qgsgraduatedsymbolrendererv2.cpp Project: lusekelok/QGIS

QList<QString> QgsGraduatedSymbolRendererV2::usedAttributes()
{
  QSet<QString> attributes;

  // mAttrName can contain either attribute name or an expression.
  // Sometimes it is not possible to distinguish between those two,
  // e.g. "a - b" can be both a valid attribute name or expression.
  // Since we do not have access to fields here, try both options.
  attributes << mAttrName;

  QgsExpression testExpr( mAttrName );
  if ( !testExpr.hasParserError() )
    attributes.unite( testExpr.referencedColumns().toSet() );

  if ( mRotation.data() ) attributes.unite( mRotation->referencedColumns().toSet() );
  if ( mSizeScale.data() ) attributes.unite( mSizeScale->referencedColumns().toSet() );

  QgsRangeList::const_iterator range_it = mRanges.constBegin();
  for ( ; range_it != mRanges.constEnd(); ++range_it )
  {
    QgsSymbolV2* symbol = range_it->symbol();
    if ( symbol )
    {
      attributes.unite( symbol->usedAttributes() );
    }
  }
  return attributes.toList();
}

Example #2

File: qgsgraduatedsymbolrendererv2.cpp Project: biolds/Quantum-GIS

QList<QString> QgsGraduatedSymbolRendererV2::usedAttributes()
{
  QSet<QString> attributes;
  attributes.insert( mAttrName );
  if ( !mRotationField.isEmpty() )
  {
    attributes.insert( mRotationField );
  }
  if ( !mSizeScaleField.isEmpty() )
  {
    attributes.insert( mSizeScaleField );
  }

  QgsSymbolV2* symbol = 0;
  QgsRangeList::const_iterator range_it = mRanges.constBegin();
  for ( ; range_it != mRanges.constEnd(); ++range_it )
  {
    symbol = range_it->symbol();
    if ( symbol )
    {
      attributes.unite( symbol->usedAttributes() );
    }
  }
  return attributes.toList();
}

Example #3

File: qgscategorizedsymbolrendererv2.cpp Project: FabrizioMu/QGIS-1

QList<QString> QgsCategorizedSymbolRendererV2::usedAttributes()
{
  QgsExpression exp( mAttrName );
  QSet<QString> attributes( exp.referencedColumns().toSet() );
  if ( mRotation.data() ) attributes.unite( mRotation->referencedColumns().toSet() );
  if ( mSizeScale.data() ) attributes.unite( mSizeScale->referencedColumns().toSet() );

  QgsCategoryList::const_iterator catIt = mCategories.constBegin();
  for ( ; catIt != mCategories.constEnd(); ++catIt )
  {
    QgsSymbolV2* catSymbol = catIt->symbol();
    if ( catSymbol )
    {
      attributes.unite( catSymbol->usedAttributes() );
    }
  }
  return attributes.toList();
}

Example #4

File: qgsgraduatedsymbolrendererv2.cpp Project: CSRedRat/QGIS

QList<QString> QgsGraduatedSymbolRendererV2::usedAttributes()
{
  QSet<QString> attributes;

  if ( QgsExpression* exp = QgsSymbolLayerV2Utils::fieldOrExpressionToExpression( mAttrName ) )
  {
    attributes.unite( exp->referencedColumns().toSet() );
    delete exp;
  }

  if ( mRotation.data() ) attributes.unite( mRotation->referencedColumns().toSet() );
  if ( mSizeScale.data() ) attributes.unite( mSizeScale->referencedColumns().toSet() );

  QgsRangeList::const_iterator range_it = mRanges.constBegin();
  for ( ; range_it != mRanges.constEnd(); ++range_it )
  {
    QgsSymbolV2* symbol = range_it->symbol();
    if ( symbol )
    {
      attributes.unite( symbol->usedAttributes() );
    }
  }
  return attributes.toList();
}

Example #5

File: qgscategorizedsymbolrendererv2.cpp Project: Adam-Brown/Quantum-GIS

QList<QString> QgsCategorizedSymbolRendererV2::usedAttributes()
{
  QSet<QString> attributes;
  attributes.insert( mAttrName );
  if ( !mRotationField.isEmpty() )
  {
    attributes.insert( mRotationField );
  }
  if ( !mSizeScaleField.isEmpty() )
  {
    attributes.insert( mSizeScaleField );
  }

  QgsCategoryList::const_iterator catIt = mCategories.constBegin();
  for ( ; catIt != mCategories.constEnd(); ++catIt )
  {
    QgsSymbolV2* catSymbol = catIt->symbol();
    if ( catSymbol )
    {
      attributes.unite( catSymbol->usedAttributes() );
    }
  }
  return attributes.toList();
}