QSizeF QgsSymbolV2LegendNode::drawSymbol( const QgsLegendSettings& settings, ItemContext* ctx, double itemHeight ) const { QgsSymbolV2* s = mItem.symbol(); if ( !s ) { return QSizeF(); } // setup temporary render context QgsRenderContext context; context.setScaleFactor( settings.dpi() / 25.4 ); context.setRendererScale( settings.mapScale() ); context.setMapToPixel( QgsMapToPixel( 1 / ( settings.mmPerMapUnit() * context.scaleFactor() ) ) ); context.setForceVectorOutput( true ); context.setPainter( ctx ? ctx->painter : 0 ); //Consider symbol size for point markers double height = settings.symbolSize().height(); double width = settings.symbolSize().width(); double size = 0; //Center small marker symbols double widthOffset = 0; double heightOffset = 0; if ( QgsMarkerSymbolV2* markerSymbol = dynamic_cast<QgsMarkerSymbolV2*>( s ) ) { // allow marker symbol to occupy bigger area if necessary size = markerSymbol->size() * QgsSymbolLayerV2Utils::lineWidthScaleFactor( context, s->outputUnit(), s->mapUnitScale() ) / context.scaleFactor(); height = size; width = size; if ( width < settings.symbolSize().width() ) { widthOffset = ( settings.symbolSize().width() - width ) / 2.0; } if ( height < settings.symbolSize().height() ) { heightOffset = ( settings.symbolSize().height() - height ) / 2.0; } } if ( ctx ) { double currentXPosition = ctx->point.x(); double currentYCoord = ctx->point.y() + ( itemHeight - settings.symbolSize().height() ) / 2; QPainter* p = ctx->painter; //setup painter scaling to dots so that raster symbology is drawn to scale double dotsPerMM = context.scaleFactor(); int opacity = 255; if ( QgsVectorLayer* vectorLayer = dynamic_cast<QgsVectorLayer*>( layerNode()->layer() ) ) opacity = 255 - ( 255 * vectorLayer->layerTransparency() / 100 ); p->save(); p->setRenderHint( QPainter::Antialiasing ); p->translate( currentXPosition + widthOffset, currentYCoord + heightOffset ); p->scale( 1.0 / dotsPerMM, 1.0 / dotsPerMM ); if ( opacity != 255 && settings.useAdvancedEffects() ) { //semi transparent layer, so need to draw symbol to an image (to flatten it first) //create image which is same size as legend rect, in case symbol bleeds outside its alloted space QSize tempImageSize( width * dotsPerMM, height * dotsPerMM ); QImage tempImage = QImage( tempImageSize, QImage::Format_ARGB32 ); tempImage.fill( Qt::transparent ); QPainter imagePainter( &tempImage ); context.setPainter( &imagePainter ); s->drawPreviewIcon( &imagePainter, tempImageSize, &context ); context.setPainter( ctx->painter ); //reduce opacity of image imagePainter.setCompositionMode( QPainter::CompositionMode_DestinationIn ); imagePainter.fillRect( tempImage.rect(), QColor( 0, 0, 0, opacity ) ); imagePainter.end(); //draw rendered symbol image p->drawImage( 0, 0, tempImage ); } else { s->drawPreviewIcon( p, QSize( width * dotsPerMM, height * dotsPerMM ), &context ); } p->restore(); } return QSizeF( qMax( width + 2 * widthOffset, ( double ) settings.symbolSize().width() ), qMax( height + 2 * heightOffset, ( double ) settings.symbolSize().height() ) ); }
QSizeF QgsSymbolLegendNode::drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const { QgsSymbol *s = mItem.symbol(); if ( !s ) { return QSizeF(); } // setup temporary render context QgsRenderContext context; context.setScaleFactor( settings.dpi() / 25.4 ); context.setRendererScale( settings.mapScale() ); context.setMapToPixel( QgsMapToPixel( 1 / ( settings.mmPerMapUnit() * context.scaleFactor() ) ) ); context.setForceVectorOutput( true ); context.setPainter( ctx ? ctx->painter : nullptr ); if ( ctx && ctx->context ) { context.setExpressionContext( ctx->context->expressionContext() ); } else { // setup a minimal expression context QgsExpressionContext expContext; expContext.appendScopes( QgsExpressionContextUtils::globalProjectLayerScopes( nullptr ) ); context.setExpressionContext( expContext ); } //Consider symbol size for point markers double height = settings.symbolSize().height(); double width = settings.symbolSize().width(); //Center small marker symbols double widthOffset = 0; double heightOffset = 0; if ( QgsMarkerSymbol *markerSymbol = dynamic_cast<QgsMarkerSymbol *>( s ) ) { // allow marker symbol to occupy bigger area if necessary double size = markerSymbol->size( context ) / context.scaleFactor(); height = size; width = size; if ( width < settings.symbolSize().width() ) { widthOffset = ( settings.symbolSize().width() - width ) / 2.0; } if ( height < settings.symbolSize().height() ) { heightOffset = ( settings.symbolSize().height() - height ) / 2.0; } } if ( ctx && ctx->painter ) { double currentXPosition = ctx->point.x(); double currentYCoord = ctx->point.y() + ( itemHeight - settings.symbolSize().height() ) / 2; QPainter *p = ctx->painter; //setup painter scaling to dots so that raster symbology is drawn to scale double dotsPerMM = context.scaleFactor(); int opacity = 255; if ( QgsVectorLayer *vectorLayer = qobject_cast<QgsVectorLayer *>( layerNode()->layer() ) ) opacity = ( 255 * vectorLayer->opacity() ); p->save(); p->setRenderHint( QPainter::Antialiasing ); p->translate( currentXPosition + widthOffset, currentYCoord + heightOffset ); p->scale( 1.0 / dotsPerMM, 1.0 / dotsPerMM ); if ( opacity != 255 && settings.useAdvancedEffects() ) { //semi transparent layer, so need to draw symbol to an image (to flatten it first) //create image which is same size as legend rect, in case symbol bleeds outside its alloted space QSize tempImageSize( width * dotsPerMM, height * dotsPerMM ); QImage tempImage = QImage( tempImageSize, QImage::Format_ARGB32 ); tempImage.fill( Qt::transparent ); QPainter imagePainter( &tempImage ); context.setPainter( &imagePainter ); s->drawPreviewIcon( &imagePainter, tempImageSize, &context ); context.setPainter( ctx->painter ); //reduce opacity of image imagePainter.setCompositionMode( QPainter::CompositionMode_DestinationIn ); imagePainter.fillRect( tempImage.rect(), QColor( 0, 0, 0, opacity ) ); imagePainter.end(); //draw rendered symbol image p->drawImage( 0, 0, tempImage ); } else { s->drawPreviewIcon( p, QSize( width * dotsPerMM, height * dotsPerMM ), &context ); } if ( !mTextOnSymbolLabel.isEmpty() ) { QFontMetricsF fm( mTextOnSymbolTextFormat.scaledFont( context ) ); qreal yBaselineVCenter = ( height * dotsPerMM + fm.ascent() - fm.descent() ) / 2; QgsTextRenderer::drawText( QPointF( width * dotsPerMM / 2, yBaselineVCenter ), 0, QgsTextRenderer::AlignCenter, QStringList() << mTextOnSymbolLabel, context, mTextOnSymbolTextFormat ); } p->restore(); } return QSizeF( std::max( width + 2 * widthOffset, static_cast< double >( settings.symbolSize().width() ) ), std::max( height + 2 * heightOffset, static_cast< double >( settings.symbolSize().height() ) ) ); }