static QString _getLayerSvgMarkerPath( const QgsProject &prj, const QString &layerName )
{
QList<QgsMapLayer *> layers = prj.mapLayersByName( layerName );
Q_ASSERT( layers.count() == 1 );
Q_ASSERT( layers[0]->type() == QgsMapLayerType::VectorLayer );
QgsVectorLayer *layer = qobject_cast<QgsVectorLayer *>( layers[0] );
Q_ASSERT( layer->renderer() );
Q_ASSERT( layer->renderer()->type() == "singleSymbol" );
QgsSingleSymbolRenderer *r = static_cast<QgsSingleSymbolRenderer *>( layer->renderer() );
QgsSymbol *s = r->symbol();
Q_ASSERT( s && s->symbolLayerCount() == 1 );
Q_ASSERT( s->symbolLayer( 0 )->layerType() == "SvgMarker" );
QgsSvgMarkerSymbolLayer *sl = static_cast<QgsSvgMarkerSymbolLayer *>( s->symbolLayer( 0 ) );
return sl->path();
}
void QgsVectorLayerRenderer::drawRendererLevels( QgsFeatureIterator &fit )
{
QHash< QgsSymbol *, QList<QgsFeature> > features; // key = symbol, value = array of features
QgsSingleSymbolRenderer *selRenderer = nullptr;
if ( !mSelectedFeatureIds.isEmpty() )
{
selRenderer = new QgsSingleSymbolRenderer( QgsSymbol::defaultSymbol( mGeometryType ) );
selRenderer->symbol()->setColor( mContext.selectionColor() );
selRenderer->setVertexMarkerAppearance( mVertexMarkerStyle, mVertexMarkerSize );
selRenderer->startRender( mContext, mFields );
}
QgsExpressionContextScope *symbolScope = QgsExpressionContextUtils::updateSymbolScope( nullptr, new QgsExpressionContextScope() );
mContext.expressionContext().appendScope( symbolScope );
// 1. fetch features
QgsFeature fet;
while ( fit.nextFeature( fet ) )
{
if ( mContext.renderingStopped() )
{
qDebug( "rendering stop!" );
stopRenderer( selRenderer );
delete mContext.expressionContext().popScope();
return;
}
if ( !fet.hasGeometry() )
continue; // skip features without geometry
mContext.expressionContext().setFeature( fet );
QgsSymbol *sym = mRenderer->symbolForFeature( fet, mContext );
if ( !sym )
{
continue;
}
if ( !features.contains( sym ) )
{
features.insert( sym, QList<QgsFeature>() );
}
features[sym].append( fet );
// new labeling engine
if ( mContext.labelingEngine() )
{
QgsGeometry obstacleGeometry;
QgsSymbolList symbols = mRenderer->originalSymbolsForFeature( fet, mContext );
if ( !symbols.isEmpty() && fet.geometry().type() == QgsWkbTypes::PointGeometry )
{
obstacleGeometry = QgsVectorLayerLabelProvider::getPointObstacleGeometry( fet, mContext, symbols );
}
if ( !symbols.isEmpty() )
{
QgsExpressionContextUtils::updateSymbolScope( symbols.at( 0 ), symbolScope );
}
if ( mLabelProvider )
{
mLabelProvider->registerFeature( fet, mContext, obstacleGeometry );
}
if ( mDiagramProvider )
{
mDiagramProvider->registerFeature( fet, mContext, obstacleGeometry );
}
}
}
delete mContext.expressionContext().popScope();
if ( features.empty() )
{
// nothing to draw
stopRenderer( selRenderer );
return;
}
// find out the order
QgsSymbolLevelOrder levels;
QgsSymbolList symbols = mRenderer->symbols( mContext );
for ( int i = 0; i < symbols.count(); i++ )
{
QgsSymbol *sym = symbols[i];
for ( int j = 0; j < sym->symbolLayerCount(); j++ )
{
int level = sym->symbolLayer( j )->renderingPass();
if ( level < 0 || level >= 1000 ) // ignore invalid levels
continue;
QgsSymbolLevelItem item( sym, j );
while ( level >= levels.count() ) // append new empty levels
levels.append( QgsSymbolLevel() );
levels[level].append( item );
}
}
// 2. draw features in correct order
for ( int l = 0; l < levels.count(); l++ )
{
QgsSymbolLevel &level = levels[l];
for ( int i = 0; i < level.count(); i++ )
{
QgsSymbolLevelItem &item = level[i];
if ( !features.contains( item.symbol() ) )
{
QgsDebugMsg( QStringLiteral( "level item's symbol not found!" ) );
continue;
}
int layer = item.layer();
QList<QgsFeature> &lst = features[item.symbol()];
QList<QgsFeature>::iterator fit;
for ( fit = lst.begin(); fit != lst.end(); ++fit )
{
if ( mContext.renderingStopped() )
{
stopRenderer( selRenderer );
return;
}
bool sel = mContext.showSelection() && mSelectedFeatureIds.contains( fit->id() );
// maybe vertex markers should be drawn only during the last pass...
bool drawMarker = ( mDrawVertexMarkers && mContext.drawEditingInformation() && ( !mVertexMarkerOnlyForSelection || sel ) );
mContext.expressionContext().setFeature( *fit );
try
{
mRenderer->renderFeature( *fit, mContext, layer, sel, drawMarker );
}
catch ( const QgsCsException &cse )
{
Q_UNUSED( cse );
QgsDebugMsg( QStringLiteral( "Failed to transform a point while drawing a feature with ID '%1'. Ignoring this feature. %2" )
.arg( fet.id() ).arg( cse.what() ) );
}
}
}
}
stopRenderer( selRenderer );
}