本文整理汇总了C++中QgsSymbolV2::usedAttributes方法的典型用法代码示例。如果您正苦于以下问题：C++ QgsSymbolV2::usedAttributes方法的具体用法？C++ QgsSymbolV2::usedAttributes怎么用？C++ QgsSymbolV2::usedAttributes使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类QgsSymbolV2的用法示例。
在下文中一共展示了QgsSymbolV2::usedAttributes方法的5个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: testExpr
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();
}示例2:
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();
}示例3: exp
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();
}示例4:
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();
}示例5:
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();
}