QgsLegendSymbolListV2 QgsSingleSymbolRendererV2::legendSymbolItemsV2() const
{
QgsLegendSymbolListV2 lst;
if ( mSymbol->type() == QgsSymbolV2::Marker )
{
const QgsMarkerSymbolV2 * symbol = static_cast<const QgsMarkerSymbolV2 *>( mSymbol.data() );
QgsDataDefined sizeDD = symbol->dataDefinedSize();
if ( sizeDD.isActive() && sizeDD.useExpression() )
{
QgsScaleExpression scaleExp( sizeDD.expressionString() );
if ( scaleExp.type() != QgsScaleExpression::Unknown )
{
QgsLegendSymbolItemV2 title( nullptr, scaleExp.baseExpression(), QString() );
lst << title;
Q_FOREACH ( double v, QgsSymbolLayerV2Utils::prettyBreaks( scaleExp.minValue(), scaleExp.maxValue(), 4 ) )
{
QgsLegendSymbolItemV2 si( mSymbol.data(), QString::number( v ), QString() );
QgsMarkerSymbolV2 * s = static_cast<QgsMarkerSymbolV2 *>( si.symbol() );
s->setDataDefinedSize( 0 );
s->setSize( scaleExp.size( v ) );
lst << si;
}
return lst;
}
}
void QgsFeatureRendererV2::convertSymbolSizeScale( QgsSymbolV2 * symbol, QgsSymbolV2::ScaleMethod method, const QString & field )
{
if ( symbol->type() == QgsSymbolV2::Marker )
{
QgsMarkerSymbolV2 * s = static_cast<QgsMarkerSymbolV2 *>( symbol );
if ( QgsSymbolV2::ScaleArea == QgsSymbolV2::ScaleMethod( method ) )
{
const QgsDataDefined dd( "coalesce(sqrt(" + QString::number( s->size() ) + " * (" + field + ")),0)" );
s->setDataDefinedSize( dd );
}
else
{
const QgsDataDefined dd( "coalesce(" + QString::number( s->size() ) + " * (" + field + "),0)" );
s->setDataDefinedSize( dd );
}
s->setScaleMethod( QgsSymbolV2::ScaleDiameter );
}
else if ( symbol->type() == QgsSymbolV2::Line )
{
QgsLineSymbolV2 * s = static_cast<QgsLineSymbolV2 *>( symbol );
const QgsDataDefined dd( "coalesce(" + QString::number( s->width() ) + " * (" + field + "),0)" );
s->setDataDefinedWidth( dd );
}
}
QgsLegendSymbolListV2 QgsCategorizedSymbolRendererV2::legendSymbolItemsV2() const
{
QgsLegendSymbolListV2 lst;
if ( mSourceSymbol.data() && mSourceSymbol->type() == QgsSymbolV2::Marker )
{
// check that all symbols that have the same size expression
QgsDataDefined ddSize;
foreach ( QgsRendererCategoryV2 category, mCategories )
{
const QgsMarkerSymbolV2 * symbol = static_cast<const QgsMarkerSymbolV2 *>( category.symbol() );
if ( !ddSize.hasDefaultValues() && symbol->dataDefinedSize() != ddSize )
{
// no common size expression
return QgsFeatureRendererV2::legendSymbolItemsV2();
}
else
{
ddSize = symbol->dataDefinedSize();
}
}
if ( !ddSize.isActive() || !ddSize.useExpression() )
{
return QgsFeatureRendererV2::legendSymbolItemsV2();
}
QgsScaleExpression exp( ddSize.expressionString() );
if ( exp.type() != QgsScaleExpression::Unknown )
{
QgsLegendSymbolItemV2 title( NULL, exp.baseExpression(), "" );
lst << title;
foreach ( double v, QgsSymbolLayerV2Utils::prettyBreaks( exp.minValue(), exp.maxValue(), 4 ) )
{
QgsLegendSymbolItemV2 si( mSourceSymbol.data(), QString::number( v ), "" );
QgsMarkerSymbolV2 * s = static_cast<QgsMarkerSymbolV2 *>( si.symbol() );
s->setDataDefinedSize( QgsDataDefined() );
s->setSize( exp.size( v ) );
lst << si;
}
// now list the categorized symbols
const QgsLegendSymbolListV2 list2 = QgsFeatureRendererV2::legendSymbolItemsV2() ;
foreach ( QgsLegendSymbolItemV2 item, list2 )
lst << item;
return lst;
}
