C++ QgsVectorLayer::renderer方法代码示例

void QgsSymbolLegendNode::checkAll( bool state )
{
  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
  if ( !vlayer || !vlayer->renderer() )
    return;

  QgsLegendSymbolList symbolList = vlayer->renderer()->legendSymbolItems();
  Q_FOREACH ( const QgsLegendSymbolItem &item, symbolList )
  {
    vlayer->renderer()->checkLegendSymbolItem( item.ruleKey(), state );
  }

void QgsSymbolLegendNode::checkAll( bool state )
{
  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
  if ( !vlayer || !vlayer->renderer() )
    return;

  const QgsLegendSymbolList symbolList = vlayer->renderer()->legendSymbolItems();
  for ( const auto &item : symbolList )
  {
    vlayer->renderer()->checkLegendSymbolItem( item.ruleKey(), state );
  }

  emit dataChanged();
  vlayer->triggerRepaint();
}

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 QgsSymbolLegendNode::setSymbol( QgsSymbol *symbol )
{
  if ( !symbol )
    return;

  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
  if ( !vlayer || !vlayer->renderer() )
    return;

  mItem.setSymbol( symbol );
  vlayer->renderer()->setLegendSymbolItem( mItem.ruleKey(), symbol );

  mPixmap = QPixmap();

  emit dataChanged();
  vlayer->triggerRepaint();
}

void QgsSymbolLegendNode::setSymbol( QgsSymbol *symbol )
{
  if ( !symbol )
    return;

  std::unique_ptr< QgsSymbol > s( symbol ); // this method takes ownership of symbol
  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
  if ( !vlayer || !vlayer->renderer() )
    return;

  mItem.setSymbol( s.get() ); // doesn't transfer ownership
  vlayer->renderer()->setLegendSymbolItem( mItem.ruleKey(), s.release() ); // DOES transfer ownership!

  mPixmap = QPixmap();

  emit dataChanged();
  vlayer->triggerRepaint();
}

bool QgsSymbolLegendNode::setData( const QVariant &value, int role )
{
  if ( role != Qt::CheckStateRole )
    return false;

  if ( !mItem.isCheckable() )
    return false;

  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
  if ( !vlayer || !vlayer->renderer() )
    return false;

  vlayer->renderer()->checkLegendSymbolItem( mItem.ruleKey(), value == Qt::Checked );

  emit dataChanged();
  vlayer->emitStyleChanged();

  vlayer->triggerRepaint();

  return true;
}

void QgsLayerStylingWidget::apply()
{
  if ( !mCurrentLayer )
    return;

  disconnect( mCurrentLayer, SIGNAL( styleChanged() ), this, SLOT( updateCurrentWidgetLayer() ) );

  QString undoName = "Style Change";

  QWidget* current = mWidgetStack->mainPanel();

  bool styleWasChanged = false;
  if ( QgsLabelingWidget* widget = qobject_cast<QgsLabelingWidget*>( current ) )
  {
    widget->apply();
    styleWasChanged = true;
    undoName = "Label Change";
  }
  if ( QgsPanelWidgetWrapper* wrapper = qobject_cast<QgsPanelWidgetWrapper*>( current ) )
  {
    if ( QgsRendererPropertiesDialog* widget = qobject_cast<QgsRendererPropertiesDialog*>( wrapper->widget() ) )
    {
      widget->apply();
      QgsVectorLayer* layer = qobject_cast<QgsVectorLayer*>( mCurrentLayer );
      QgsRendererAbstractMetadata* m = QgsRendererRegistry::instance()->rendererMetadata( layer->renderer()->type() );
      undoName = QString( "Style Change - %1" ).arg( m->visibleName() );
      styleWasChanged = true;
    }
  }
  else if ( QgsRasterTransparencyWidget* widget = qobject_cast<QgsRasterTransparencyWidget*>( current ) )
  {
    widget->apply();
    styleWasChanged = true;
  }
  else if ( qobject_cast<QgsRasterHistogramWidget*>( current ) )
  {
    mRasterStyleWidget->apply();
    styleWasChanged = true;
  }
  else if ( QgsMapLayerConfigWidget* widget = qobject_cast<QgsMapLayerConfigWidget*>( current ) )
  {
    widget->apply();
    styleWasChanged = true;
  }

  pushUndoItem( undoName );

  if ( styleWasChanged )
  {
    emit styleChanged( mCurrentLayer );
    QgsProject::instance()->setDirty( true );
    mCurrentLayer->triggerRepaint();
  }
  connect( mCurrentLayer, SIGNAL( styleChanged() ), this, SLOT( updateCurrentWidgetLayer() ) );
}

void QgsQuickPrint::scalePointSymbols( int theScaleFactor, SymbolScalingType theDirection )
{
  if ( 0 >= theScaleFactor )
  {
    QgsDebugMsg( "invalid scale factor" );
    return;
  }
  QStringList myLayerSet = mpMapRenderer->layerSet();
  QStringListIterator myLayerIterator( myLayerSet );
  while ( myLayerIterator.hasNext() )
  {
    QString myLayerId = myLayerIterator.next();
    QgsDebugMsg( "Scaling point symbols for print for " + myLayerId );
    QgsMapLayer * mypLayer =
      QgsMapLayerRegistry::instance()->mapLayer( myLayerId );
    if ( mypLayer )
    {
      QgsVectorLayer *mypVectorLayer  =
        qobject_cast<QgsVectorLayer *>( mypLayer );
      if ( mypVectorLayer )
      {
        const QgsRenderer* mypRenderer = mypVectorLayer->renderer();
        const QList<QgsSymbol*> mySymbolList = mypRenderer->symbols();
        //
        // Single symbol
        //
        if ( 1 == mySymbolList.size() )
        {
          QgsSymbol * mypSymbol = mySymbolList.at( 0 );
          if ( mypSymbol->type() == QGis::Point )
          {
            if ( theDirection == ScaleUp )
            {
              mypSymbol->setPointSize( mypSymbol->pointSize() * theScaleFactor );
            }
            else //Scale Down
            {
              mypSymbol->setPointSize( mypSymbol->pointSize() / theScaleFactor );
            }
          }
        }
        else  //class breaks
        {
          QListIterator<QgsSymbol *> myIterator( mySymbolList );
          while ( myIterator.hasNext() )
          {
            QgsSymbol * mypSymbol = myIterator.next();
            if ( mypSymbol->type() == QGis::Point )
            {
              if ( theDirection == ScaleUp )
              {
                mypSymbol->setPointSize( mypSymbol->pointSize() * theScaleFactor );
              }
              else //Scale Down
              {
                mypSymbol->setPointSize( mypSymbol->pointSize() / theScaleFactor );
              }
            }
          } //symbol loop
        } //class breaks
      } //if vectorlayer
    } //if maplayer
  } //layer iterator
}

//.........这里部分代码省略.........
  myPrintPainter.setViewport( myOriginX,
                              myOriginY,
                              myOriginalViewport.width(),
                              myOriginalViewport.height() );
  //draw a rectangale around the legend frame
  //@TODO make this user settable
  if ( 0 == 1 ) //put some real logic here
  {
    myPrintPainter.drawRect( 0, 0, myLegendDimensionX, myLegendDimensionY );
  }
  //get font metric and other vars needed
  QFontMetrics myLegendFontMetrics( myLegendFont, &myPrinter );
  int myLegendFontHeight = myLegendFontMetrics.height();
  int myLegendXPos = 0;
  int myLegendYPos = 0;
  int myLegendSpacer = myLegendFontHeight / 2; //for vertical and horizontal spacing
  int myLegendVerticalSpacer = myLegendFontHeight / 3; //for vertical between rows
  int myIconWidth = myLegendFontHeight;
  myPrintPainter.setFont( myLegendFont );
  QStringList myLayerSet = mpMapRenderer->layerSet();
  QStringListIterator myLayerIterator( myLayerSet );
  //second clause below is to prevent legend spilling out the bottom
  while ( myLayerIterator.hasNext() &&
          myLegendYPos < myLegendDimensionY )
  {
    QString myLayerId = myLayerIterator.next();
    QgsMapLayer * mypLayer =
      QgsMapLayerRegistry::instance()->mapLayer( myLayerId );
    if ( mypLayer )
    {
      QgsVectorLayer *mypVectorLayer  =
        qobject_cast<QgsVectorLayer *>( mypLayer );
      // TODO: add support for symbology-ng renderers
      if ( mypVectorLayer && mypVectorLayer->renderer() )
      {
        QString myLayerName = mypVectorLayer->name();
        QIcon myIcon;
        QPixmap myPixmap( QSize( myIconWidth, myIconWidth ) );   //square
        //based on code from qgslegendlayer.cpp - see that file for more info
        const QgsRenderer* mypRenderer = mypVectorLayer->renderer();
        const QList<QgsSymbol*> mySymbolList = mypRenderer->symbols();
        //
        // Single symbol
        //
        double widthScale = ( myPrinter.logicalDpiX() + myPrinter.logicalDpiY() ) / 2.0 / 25.4;

        if ( 1 == mySymbolList.size() )
        {
          QgsSymbol * mypSymbol = mySymbolList.at( 0 );
          myPrintPainter.setPen( mypSymbol->pen() );
          myPrintPainter.setBrush( mypSymbol->brush() );
          myLegendXPos = 0 ;
          if ( mypSymbol->type() == QGis::Point )
          {
            QImage myImage;
            myImage = mypSymbol->getPointSymbolAsImage( widthScale );
            myPrintPainter.drawImage( myLegendXPos, myLegendYPos, myImage );
          }
          else if ( mypSymbol->type() == QGis::Line )
          {
            myPrintPainter.drawLine( myLegendXPos, myLegendYPos,
                                     myLegendXPos + myIconWidth,
                                     myLegendYPos + myIconWidth );
          }
          else //polygon
          {

QVariant QgsSymbolLegendNode::data( int role ) const
{
  if ( role == Qt::DisplayRole )
  {
    return mLabel;
  }
  else if ( role == Qt::EditRole )
  {
    return mUserLabel.isEmpty() ? mItem.label() : mUserLabel;
  }
  else if ( role == Qt::DecorationRole )
  {
    if ( mPixmap.isNull() || mPixmap.size() != mIconSize )
    {
      QPixmap pix;
      if ( mItem.symbol() )
      {
        std::unique_ptr<QgsRenderContext> context( createTemporaryRenderContext() );
        pix = QgsSymbolLayerUtils::symbolPreviewPixmap( mItem.symbol(), mIconSize, 0, context.get() );

        if ( !mTextOnSymbolLabel.isEmpty() && context )
        {
          QPainter painter( &pix );
          painter.setRenderHint( QPainter::Antialiasing );
          context->setPainter( &painter );
          QFontMetricsF fm( mTextOnSymbolTextFormat.scaledFont( *context ) );
          qreal yBaselineVCenter = ( mIconSize.height() + fm.ascent() - fm.descent() ) / 2;
          QgsTextRenderer::drawText( QPointF( mIconSize.width() / 2, yBaselineVCenter ), 0, QgsTextRenderer::AlignCenter,
                                     QStringList() << mTextOnSymbolLabel, *context, mTextOnSymbolTextFormat );
        }
      }
      else
      {
        pix = QPixmap( mIconSize );
        pix.fill( Qt::transparent );
      }

      if ( mItem.level() == 0 || ( model() && model()->testFlag( QgsLayerTreeModel::ShowLegendAsTree ) ) )
        mPixmap = pix;
      else
      {
        // ident the symbol icon to make it look like a tree structure
        QPixmap pix2( pix.width() + mItem.level() * INDENT_SIZE, pix.height() );
        pix2.fill( Qt::transparent );
        QPainter p( &pix2 );
        p.drawPixmap( mItem.level() * INDENT_SIZE, 0, pix );
        p.end();
        mPixmap = pix2;
      }
    }
    return mPixmap;
  }
  else if ( role == Qt::CheckStateRole )
  {
    if ( !mItem.isCheckable() )
      return QVariant();

    QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayerNode->layer() );
    if ( !vlayer || !vlayer->renderer() )
      return QVariant();

    return vlayer->renderer()->legendSymbolItemChecked( mItem.ruleKey() ) ? Qt::Checked : Qt::Unchecked;
  }
  else if ( role == RuleKeyRole )
  {
    return mItem.ruleKey();
  }
  else if ( role == ParentRuleKeyRole )
  {
    return mItem.parentRuleKey();
  }

  return QVariant();
}

//.........这里部分代码省略.........
        connect( actionSaveAsDefinitionLayer, &QAction::triggered, QgisApp::instance(), &QgisApp::saveAsLayerDefinition );
        menuExportRaster->addAction( actionSaveAsDefinitionLayer );
        connect( actionSaveStyle, &QAction::triggered, QgisApp::instance(), [ = ] { QgisApp::instance()->saveStyleFile(); } );
        menuExportRaster->addAction( actionSaveStyle );
        menu->addMenu( menuExportRaster );
      }
      else if ( layer && layer->type() == QgsMapLayer::PluginLayer && mView->selectedLayerNodes().count() == 1 )
      {
        // disable duplication of plugin layers
        duplicateLayersAction->setEnabled( false );
      }

      menu->addSeparator();

      // style-related actions
      if ( layer && mView->selectedLayerNodes().count() == 1 )
      {
        menu->addSeparator();
        QMenu *menuStyleManager = new QMenu( tr( "Styles" ), menu );

        QgisApp *app = QgisApp::instance();
        menuStyleManager->addAction( tr( "Copy Style" ), app, SLOT( copyStyle() ) );

        if ( app->clipboard()->hasFormat( QGSCLIPBOARD_STYLE_MIME ) )
        {
          menuStyleManager->addAction( tr( "Paste Style" ), app, SLOT( pasteStyle() ) );
        }

        menuStyleManager->addSeparator();
        QgsMapLayerStyleGuiUtils::instance()->addStyleManagerActions( menuStyleManager, layer );

        if ( vlayer )
        {
          const QgsSingleSymbolRenderer *singleRenderer = dynamic_cast< const QgsSingleSymbolRenderer * >( vlayer->renderer() );
          if ( !singleRenderer && vlayer->renderer() && vlayer->renderer()->embeddedRenderer() )
          {
            singleRenderer = dynamic_cast< const QgsSingleSymbolRenderer * >( vlayer->renderer()->embeddedRenderer() );
          }
          if ( singleRenderer && singleRenderer->symbol() )
          {
            //single symbol renderer, so add set color/edit symbol actions
            menuStyleManager->addSeparator();
            QgsColorWheel *colorWheel = new QgsColorWheel( menuStyleManager );
            colorWheel->setColor( singleRenderer->symbol()->color() );
            QgsColorWidgetAction *colorAction = new QgsColorWidgetAction( colorWheel, menuStyleManager, menuStyleManager );
            colorAction->setDismissOnColorSelection( false );
            connect( colorAction, &QgsColorWidgetAction::colorChanged, this, &QgsAppLayerTreeViewMenuProvider::setVectorSymbolColor );
            //store the layer id in action, so we can later retrieve the corresponding layer
            colorAction->setProperty( "layerId", vlayer->id() );
            menuStyleManager->addAction( colorAction );

            //add recent colors action
            QList<QgsRecentColorScheme *> recentSchemes;
            QgsApplication::colorSchemeRegistry()->schemes( recentSchemes );
            if ( !recentSchemes.isEmpty() )
            {
              QgsColorSwatchGridAction *recentColorAction = new QgsColorSwatchGridAction( recentSchemes.at( 0 ), menuStyleManager, QStringLiteral( "symbology" ), menuStyleManager );
              recentColorAction->setProperty( "layerId", vlayer->id() );
              recentColorAction->setDismissOnColorSelection( false );
              menuStyleManager->addAction( recentColorAction );
              connect( recentColorAction, &QgsColorSwatchGridAction::colorChanged, this, &QgsAppLayerTreeViewMenuProvider::setVectorSymbolColor );
            }

            menuStyleManager->addSeparator();
            QAction *editSymbolAction = new QAction( tr( "Edit Symbol…" ), menuStyleManager );
            //store the layer id in action, so we can later retrieve the corresponding layer

QgsFeatureIds QgsMapToolSelectUtils::getMatchingFeatures( QgsMapCanvas *canvas, const QgsGeometry &selectGeometry, bool doContains, bool singleSelect )
{
  QgsFeatureIds newSelectedFeatures;

  if ( selectGeometry.type() != QgsWkbTypes::PolygonGeometry )
    return newSelectedFeatures;

  QgsVectorLayer *vlayer = QgsMapToolSelectUtils::getCurrentVectorLayer( canvas );
  if ( !vlayer )
    return newSelectedFeatures;

  // toLayerCoordinates will throw an exception for any 'invalid' points in
  // the rubber band.
  // For example, if you project a world map onto a globe using EPSG 2163
  // and then click somewhere off the globe, an exception will be thrown.
  QgsGeometry selectGeomTrans = selectGeometry;

  try
  {
    QgsCoordinateTransform ct( canvas->mapSettings().destinationCrs(), vlayer->crs(), QgsProject::instance() );

    if ( !ct.isShortCircuited() && selectGeomTrans.type() == QgsWkbTypes::PolygonGeometry )
    {
      // convert add more points to the edges of the rectangle
      // improve transformation result
      QgsPolygonXY poly( selectGeomTrans.asPolygon() );
      if ( poly.size() == 1 && poly.at( 0 ).size() == 5 )
      {
        const QgsPolylineXY &ringIn = poly.at( 0 );

        QgsPolygonXY newpoly( 1 );
        newpoly[0].resize( 41 );
        QgsPolylineXY &ringOut = newpoly[0];

        ringOut[ 0 ] = ringIn.at( 0 );

        int i = 1;
        for ( int j = 1; j < 5; j++ )
        {
          QgsVector v( ( ringIn.at( j ) - ringIn.at( j - 1 ) ) / 10.0 );
          for ( int k = 0; k < 9; k++ )
          {
            ringOut[ i ] = ringOut[ i - 1 ] + v;
            i++;
          }
          ringOut[ i++ ] = ringIn.at( j );
        }
        selectGeomTrans = QgsGeometry::fromPolygonXY( newpoly );
      }
    }

    selectGeomTrans.transform( ct );
  }
  catch ( QgsCsException &cse )
  {
    Q_UNUSED( cse );
    // catch exception for 'invalid' point and leave existing selection unchanged
    QgsDebugMsg( QStringLiteral( "Caught CRS exception " ) );
    QgisApp::instance()->messageBar()->pushMessage(
      QObject::tr( "CRS Exception" ),
      QObject::tr( "Selection extends beyond layer's coordinate system" ),
      Qgis::Warning,
      QgisApp::instance()->messageTimeout() );
    return newSelectedFeatures;
  }

  QgsDebugMsgLevel( "Selection layer: " + vlayer->name(), 3 );
  QgsDebugMsgLevel( "Selection polygon: " + selectGeomTrans.asWkt(), 3 );
  QgsDebugMsgLevel( "doContains: " + QString( doContains ? "T" : "F" ), 3 );

  QgsRenderContext context = QgsRenderContext::fromMapSettings( canvas->mapSettings() );
  context.expressionContext() << QgsExpressionContextUtils::layerScope( vlayer );
  std::unique_ptr< QgsFeatureRenderer > r;
  if ( vlayer->renderer() )
  {
    r.reset( vlayer->renderer()->clone() );
    r->startRender( context, vlayer->fields() );
  }

  QgsFeatureRequest request;
  request.setFilterRect( selectGeomTrans.boundingBox() );
  request.setFlags( QgsFeatureRequest::ExactIntersect );
  if ( r )
    request.setSubsetOfAttributes( r->usedAttributes( context ), vlayer->fields() );
  else
    request.setNoAttributes();

  QgsFeatureIterator fit = vlayer->getFeatures( request );

  QgsFeature f;
  QgsFeatureId closestFeatureId = 0;
  bool foundSingleFeature = false;
  double closestFeatureDist = std::numeric_limits<double>::max();
  while ( fit.nextFeature( f ) )
  {
    context.expressionContext().setFeature( f );
    // make sure to only use features that are visible
    if ( r && !r->willRenderFeature( f, context ) )
      continue;

//.........这里部分代码省略.........