File indexing completed on 2024-05-12 04:20:30

 /*
  * SPDX-FileCopyrightText: 2001-2015 Klaralvdalens Datakonsult AB. All rights reserved.
  *
  * This file is part of the KD Chart library.
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 //
 //  W A R N I N G
 //  -------------
 //
 // This file is not part of the KD Chart API.  It exists purely as an
 // implementation detail.  This header file may change from version to
 // version without notice, or even be removed.
 //
 // We mean it.
 //
 
 #include "KChartAbstractDiagram_p.h"
 
 #include "KChartBarDiagram.h"
 #include "KChartFrameAttributes.h"
 #include "KChartPainterSaver_p.h"
 
 #include <QAbstractTextDocumentLayout>
 #include <QTextBlock>
 #include <QApplication>
 
 
 using namespace KChart;
 
 LabelPaintInfo::LabelPaintInfo() :
     isValuePositive( false )
 {
 }
 
 LabelPaintInfo::LabelPaintInfo( const QModelIndex& _index, const DataValueAttributes& _attrs,
                                 const QPainterPath& _labelArea, const QPointF& _markerPos,
                                 bool _isValuePositive, const QString& _value )
     : index( _index )
     , attrs( _attrs )
     , labelArea( _labelArea )
     , markerPos( _markerPos )
     , isValuePositive( _isValuePositive )
     , value( _value )
 {
 }
 
 LabelPaintInfo::LabelPaintInfo( const LabelPaintInfo& other )
     : index( other.index )
     , attrs( other.attrs )
     , labelArea( other.labelArea )
     , markerPos( other.markerPos )
     , isValuePositive( other.isValuePositive )
     , value( other.value )
 {
 }
 
 AbstractDiagram::Private::Private()
   : diagram( nullptr )
   , doDumpPaintTime( false )
   , plane( nullptr )
   , attributesModel( new PrivateAttributesModel(nullptr,nullptr) )
   , allowOverlappingDataValueTexts( false )
   , antiAliasing( true )
   , percent( false )
   , datasetDimension( 1 )
   , databoundariesDirty( true )
   , mCachedFontMetrics( QFontMetrics( qApp->font() ) )
 {
 }
 
 AbstractDiagram::Private::~Private()
 {
   if ( attributesModel && qobject_cast<PrivateAttributesModel*>(attributesModel) )
     delete attributesModel;
 }
 
 void AbstractDiagram::Private::init()
 {
 }
 
 void AbstractDiagram::Private::init( AbstractCoordinatePlane* newPlane )
 {
     plane = newPlane;
 }
 
 bool AbstractDiagram::Private::usesExternalAttributesModel() const
 {
     return ( ! attributesModel.isNull() ) &&
            ( ! qobject_cast<PrivateAttributesModel*>(attributesModel) );
 }
 
 void AbstractDiagram::Private::setAttributesModel( AttributesModel* amodel )
 {
     if ( attributesModel == amodel ) {
         return;
     }
 
     if ( !attributesModel.isNull() ) {
         if ( qobject_cast< PrivateAttributesModel* >( attributesModel ) ) {
             delete attributesModel;
         } else {
             disconnect( attributesModel, SIGNAL(rowsInserted(QModelIndex,int,int)),
                         diagram, SLOT(setDataBoundariesDirty()) );
             disconnect( attributesModel, SIGNAL(columnsInserted(QModelIndex,int,int)),
                         diagram, SLOT(setDataBoundariesDirty()) );
             disconnect( attributesModel, SIGNAL(rowsRemoved(QModelIndex,int,int)),
                         diagram, SLOT(setDataBoundariesDirty()) );
             disconnect( attributesModel, SIGNAL(columnsRemoved(QModelIndex,int,int)),
                         diagram, SLOT(setDataBoundariesDirty()) );
             disconnect( attributesModel, SIGNAL(modelReset()),
                         diagram, SLOT(setDataBoundariesDirty()) );
             disconnect( attributesModel, SIGNAL(layoutChanged()),
                         diagram, SLOT(setDataBoundariesDirty()) );
             disconnect( attributesModel, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
                         diagram, SIGNAL(modelDataChanged()));
         }
     }
 
     Q_EMIT diagram->attributesModelAboutToChange( amodel, attributesModel );
 
     connect( amodel, SIGNAL(rowsInserted(QModelIndex,int,int)),
              diagram, SLOT(setDataBoundariesDirty()) );
     connect( amodel, SIGNAL(columnsInserted(QModelIndex,int,int)),
              diagram, SLOT(setDataBoundariesDirty()) );
     connect( amodel, SIGNAL(rowsRemoved(QModelIndex,int,int)),
              diagram, SLOT(setDataBoundariesDirty()) );
     connect( amodel, SIGNAL(columnsRemoved(QModelIndex,int,int)),
              diagram, SLOT(setDataBoundariesDirty()) );
     connect( amodel, SIGNAL(modelReset()),
              diagram, SLOT(setDataBoundariesDirty()) );
     connect( amodel, SIGNAL(layoutChanged()),
              diagram, SLOT(setDataBoundariesDirty()) );
     connect( amodel, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
              diagram, SIGNAL(modelDataChanged()));
 
     attributesModel = amodel;
 }
 
 AbstractDiagram::Private::Private( const AbstractDiagram::Private& rhs ) :
     diagram( nullptr ),
     doDumpPaintTime( rhs.doDumpPaintTime ),
     // Do not copy the plane
     plane( nullptr ),
     attributesModelRootIndex( QModelIndex() ),
     attributesModel( rhs.attributesModel ),
     allowOverlappingDataValueTexts( rhs.allowOverlappingDataValueTexts ),
     antiAliasing( rhs.antiAliasing ),
     percent( rhs.percent ),
     datasetDimension( rhs.datasetDimension ),
     mCachedFontMetrics( rhs.cachedFontMetrics() )
 {
     attributesModel = new PrivateAttributesModel( nullptr, nullptr);
     attributesModel->initFrom( rhs.attributesModel );
 }
 
 // FIXME: Optimize if necessary
 qreal AbstractDiagram::Private::calcPercentValue( const QModelIndex & index ) const
 {
     qreal sum = 0.0;
     for ( int col = 0; col < attributesModel->columnCount( QModelIndex() ); col++ )
         sum += attributesModel->data( attributesModel->index( index.row(), col, QModelIndex() ) ).toReal(); // checked
     if ( sum == 0.0 )
         return 0.0;
     return attributesModel->data( attributesModel->mapFromSource( index ) ).toReal() / sum * 100.0;
 }
 
 void AbstractDiagram::Private::addLabel(
     LabelPaintCache* cache,
     const QModelIndex& index,
     const CartesianDiagramDataCompressor::CachePosition* position,
     const PositionPoints& points,
     const Position& autoPositionPositive, const Position& autoPositionNegative,
     const qreal value, qreal favoriteAngle /* = 0.0 */ )
 {
     CartesianDiagramDataCompressor::AggregatedDataValueAttributes allAttrs(
         aggregatedAttrs( index, position ) );
 
     QMap<QModelIndex, DataValueAttributes>::const_iterator it;
     for ( it = allAttrs.constBegin(); it != allAttrs.constEnd(); ++it ) {
         DataValueAttributes dva = it.value();
         if ( !dva.isVisible() ) {
             continue;
         }
 
         const bool isPositive = ( value >= 0.0 );
 
         RelativePosition relPos( dva.position( isPositive ) );
         relPos.setReferencePoints( points );
         if ( relPos.referencePosition().isUnknown() ) {
             relPos.setReferencePosition( isPositive ? autoPositionPositive : autoPositionNegative );
         }
 
         // Rotate the label position (not the label itself) if the diagram is rotated so that the defaults still work
         if ( isTransposed() ) {
             KChartEnums::PositionValue posValue = relPos.referencePosition().value();
             if ( posValue >= KChartEnums::PositionNorthWest && posValue <= KChartEnums::PositionWest ) {
                 // rotate 90 degrees clockwise
                 posValue = static_cast< KChartEnums::PositionValue >( posValue + 2 );
                 if ( posValue > KChartEnums::PositionWest ) {
                     // wraparound
                     posValue = static_cast< KChartEnums::PositionValue >( posValue -
                                 ( KChartEnums::PositionWest - KChartEnums::PositionNorthWest ) );
                 }
                 relPos.setReferencePosition( Position( posValue ) );
             }
         }
 
         const QPointF referencePoint = relPos.referencePoint();
         if ( !diagram->coordinatePlane()->isVisiblePoint( referencePoint ) ) {
             continue;
         }
 
         const qreal fontHeight = cachedFontMetrics( dva.textAttributes().
                 calculatedFont( plane, KChartEnums::MeasureOrientationMinimum ), diagram )->height();
 
         // Note: When printing data value texts and padding's Measure is using automatic reference area
         //       detection, the font height is used as reference size for both horizontal and vertical
         //       padding.
         QSizeF relativeMeasureSize( fontHeight, fontHeight );
 
         if ( !dva.textAttributes().hasRotation() ) {
             TextAttributes ta = dva.textAttributes();
             ta.setRotation( favoriteAngle );
             dva.setTextAttributes( ta );
         }
 
         // get the size of the label text using a subset of the information going into the final layout
         const QString text = formatDataValueText( dva, index, value );
         QTextDocument doc;
         doc.setDocumentMargin( 0 );
         if ( Qt::mightBeRichText( text ) ) {
             doc.setHtml( text );
         } else {
             doc.setPlainText( text );
         }
         const QFont calculatedFont( dva.textAttributes()
                                     .calculatedFont( plane, KChartEnums::MeasureOrientationMinimum ) );
         doc.setDefaultFont( calculatedFont );
 
         const QRectF plainRect = doc.documentLayout()->frameBoundingRect( doc.rootFrame() );
 
         /*
         * A few hints on how the positioning of the text frame is done:
         *
         * Let's assume we have a bar chart, a text for a positive value
         * to be drawn, and "North" as attrs.positivePosition().
         *
         * The reference point (pos) is then set to the top center point
         * of a bar. The offset now depends on the alignment:
         *
         *    Top: text is centered horizontally to the bar, bottom of
         *         text frame starts at top of bar
         *
         *    Bottom: text is centered horizontally to the bar, top of
         *            text frame starts at top of bar
         *
         *    Center: text is centered horizontally to the bar, center
         *            line of text frame is same as top of bar
         *
         *    TopLeft: right edge of text frame is horizontal center of
         *             bar, bottom of text frame is top of bar.
         *
         *    ...
         *
         * Positive and negative value labels are treated equally, "North"
         * also refers to the top of a negative bar, and *not* to the bottom.
         *
         *
         * "NorthEast" likewise refers to the top right edge of the bar,
         * "NorthWest" to the top left edge of the bar, and so on.
         *
         * In other words, attrs.positivePosition() always refers to a
         * position of the *bar*, and relPos.alignment() always refers
         * to an alignment of the text frame relative to this position.
         */
 
         QTransform transform;
         {
             // move to the general area where the label should be
             QPointF calcPoint = relPos.calculatedPoint( relativeMeasureSize );
             transform.translate( calcPoint.x(), calcPoint.y() );
             // align the text rect; find out by how many half-widths / half-heights to move.
             int dx = -1;
             if ( relPos.alignment() & Qt::AlignLeft ) {
                 dx -= 1;
             } else if ( relPos.alignment() & Qt::AlignRight ) {
                  dx += 1;
             }
 
             int dy = -1;
             if ( relPos.alignment() & Qt::AlignTop ) {
                 dy -= 1;
             } else if ( relPos.alignment() & Qt::AlignBottom ) {
                 dy += 1;
             }
             transform.translate( qreal( dx ) * plainRect.width() * 0.5,
                                  qreal( dy ) * plainRect.height() * 0.5 );
 
             // rotate the text rect around its center
             transform.translate( plainRect.center().x(), plainRect.center().y() );
             int rotation = dva.textAttributes().rotation();
             if ( !isPositive && dva.mirrorNegativeValueTextRotation() ) {
                 rotation *= -1;
             }
             transform.rotate( rotation );
             transform.translate( -plainRect.center().x(), -plainRect.center().y() );
         }
 
         QPainterPath labelArea;
         //labelArea.addPolygon( transform.mapToPolygon( plainRect.toRect() ) );
         //labelArea.closeSubpath();
         // Not doing that because QTransform has a special case for 180° that gives a different than
         // usual ordering of the points in the polygon returned by mapToPolygon( const QRect & ).
         // We expect a particular ordering in paintDataValueTextsAndMarkers() by using elementAt( 0 ),
         // and similar things might happen elsewhere.
         labelArea.addPolygon( transform.map( QPolygon( plainRect.toRect(), true ) ) );
 
         // store the label geometry and auxiliary data
         cache->paintReplay.append( LabelPaintInfo( it.key(), dva, labelArea,
                                                    referencePoint, value >= 0.0, text ) );
     }
 }
 
 const QFontMetrics* AbstractDiagram::Private::cachedFontMetrics( const QFont& font,
                                                                  const QPaintDevice* paintDevice) const
 {
     if ( ( font != mCachedFont ) || ( paintDevice != mCachedPaintDevice ) ) {
         mCachedFontMetrics = QFontMetrics( font, const_cast<QPaintDevice *>( paintDevice ) );
         // TODO what about setting mCachedFont and mCachedPaintDevice?
     }
     return &mCachedFontMetrics;
 }
 
 const QFontMetrics AbstractDiagram::Private::cachedFontMetrics() const
 {
     return mCachedFontMetrics;
 }
 
 QString AbstractDiagram::Private::formatNumber( qreal value, int decimalDigits ) const
 {
     const int digits = qMax(decimalDigits, 0);
     const qreal roundingEpsilon = pow( 0.1, digits ) * ( value >= 0.0 ? 0.5 : -0.5 );
     QString asString = QString::number( value + roundingEpsilon, 'f' );
     const int decimalPos = asString.indexOf( QLatin1Char( '.' ) );
     if ( decimalPos < 0 ) {
         return asString;
     }
 
     int last = qMin( decimalPos + digits, asString.length() - 1 );
     // remove trailing zeros (and maybe decimal dot)
     while ( last > decimalPos && asString[ last ] == QLatin1Char( '0' ) ) {
         last--;
     }
     if ( last == decimalPos ) {
          last--;
     }
     asString.chop( asString.length() - last - 1 );
     return asString;
 }
 
 void AbstractDiagram::Private::forgetAlreadyPaintedDataValues()
 {
     alreadyDrawnDataValueTexts.clear();
     prevPaintedDataValueText.clear();
 }
 
 void AbstractDiagram::Private::paintDataValueTextsAndMarkers(
     PaintContext* ctx,
     const LabelPaintCache &cache,
     bool paintMarkers,
     bool justCalculateRect /* = false */,
     QRectF* cumulatedBoundingRect /* = 0 */ )
 {
     if ( justCalculateRect && !cumulatedBoundingRect ) {
         qWarning() << Q_FUNC_INFO << "Neither painting nor finding the bounding rect, what are we doing?";
     }
 
     const PainterSaver painterSaver( ctx->painter() );
     ctx->painter()->setClipping( false );
 
     if ( paintMarkers && !justCalculateRect ) {
         for ( const LabelPaintInfo& info : qAsConst(cache.paintReplay) ) {
             diagram->paintMarker( ctx->painter(), info.index, info.markerPos );
         }
     }
 
     TextAttributes ta;
     {
         Measure m( 18.0, KChartEnums::MeasureCalculationModeRelative,
                    KChartEnums::MeasureOrientationMinimum );
         m.setReferenceArea( ctx->coordinatePlane() );
         ta.setFontSize( m );
         m.setAbsoluteValue( 6.0 );
         ta.setMinimalFontSize( m );
     }
 
     forgetAlreadyPaintedDataValues();
 
     for ( const LabelPaintInfo& info : qAsConst(cache.paintReplay) ) {
         const QPointF pos = info.labelArea.elementAt( 0 );
         paintDataValueText( ctx->painter(), info.attrs, pos, info.isValuePositive,
                             info.value, justCalculateRect, cumulatedBoundingRect );
 
         const QString comment = info.index.data( KChart::CommentRole ).toString();
         if ( comment.isEmpty() ) {
             continue;
         }
         TextBubbleLayoutItem item( comment, ta, ctx->coordinatePlane()->parent(),
                                    KChartEnums::MeasureOrientationMinimum,
                                    Qt::AlignHCenter | Qt::AlignVCenter );
         const QRect rect( pos.toPoint(), item.sizeHint() );
 
         if (cumulatedBoundingRect) {
             (*cumulatedBoundingRect) |= rect;
         }
         if ( !justCalculateRect ) {
             item.setGeometry( rect );
             item.paint( ctx->painter() );
         }
     }
     if ( cumulatedBoundingRect ) {
         *cumulatedBoundingRect = ctx->painter()->transform().inverted().mapRect( *cumulatedBoundingRect );
     }
 }
 
 QString AbstractDiagram::Private::formatDataValueText( const DataValueAttributes &dva,
                                                        const QModelIndex& index, qreal value ) const
 {
     if ( !dva.isVisible() ) {
         return QString();
     }
     if ( dva.usePercentage() ) {
         value = calcPercentValue( index );
     }
 
     QString ret;
     if ( dva.dataLabel().isNull() ) {
         ret = formatNumber( value, dva.decimalDigits() );
     } else {
         ret = dva.dataLabel();
     }
 
     ret.prepend( dva.prefix() );
     ret.append( dva.suffix() );
 
     return ret;
 }
 
 void AbstractDiagram::Private::paintDataValueText(
     QPainter* painter,
     const QModelIndex& index,
     const QPointF& pos,
     qreal value,
     bool justCalculateRect /* = false */,
     QRectF* cumulatedBoundingRect /* = 0 */ )
 {
     const DataValueAttributes dva( diagram->dataValueAttributes( index ) );
     const QString text = formatDataValueText( dva, index, value );
     paintDataValueText( painter, dva, pos, value >= 0.0, text,
                         justCalculateRect, cumulatedBoundingRect );
 }
 
 void AbstractDiagram::Private::paintDataValueText(
     QPainter* painter,
     const DataValueAttributes& attrs,
     const QPointF& pos,
     bool valueIsPositive,
     const QString& text,
     bool justCalculateRect /* = false */,
     QRectF* cumulatedBoundingRect /* = 0 */ )
 {
     if ( !attrs.isVisible() ) {
         return;
     }
 
     const TextAttributes ta( attrs.textAttributes() );
     if ( !ta.isVisible() || ( !attrs.showRepetitiveDataLabels() && prevPaintedDataValueText == text ) ) {
         return;
     }
     prevPaintedDataValueText = text;
 
     QTextDocument doc;
     doc.setDocumentMargin( 0.0 );
     if ( Qt::mightBeRichText( text ) ) {
         doc.setHtml( text );
     } else {
         doc.setPlainText( text );
     }
 
     const QFont calculatedFont( ta.calculatedFont( plane, KChartEnums::MeasureOrientationMinimum ) );
 
     const PainterSaver painterSaver( painter );
     painter->setPen( PrintingParameters::scalePen( ta.pen() ) );
 
     doc.setDefaultFont( calculatedFont );
     QAbstractTextDocumentLayout::PaintContext context;
     context.palette = diagram->palette();
     context.palette.setColor( QPalette::Text, ta.pen().color() );
 
     QAbstractTextDocumentLayout* const layout = doc.documentLayout();
     layout->setPaintDevice( painter->device() );
 
     painter->translate( pos.x(), pos.y() );
     int rotation = ta.rotation();
     if ( !valueIsPositive && attrs.mirrorNegativeValueTextRotation() ) {
         rotation *= -1;
     }
     painter->rotate( rotation );
 
     // do overlap detection "as seen by the painter"
     QTransform transform = painter->worldTransform();
 
     bool drawIt = true;
     // note: This flag can be set differently for every label text!
     // In theory a user could e.g. have some small red text on one of the
     // values that she wants to have written in any case - so we just
     // do not test if such texts would cover some of the others.
     if ( !attrs.showOverlappingDataLabels() ) {
         const QRectF br( layout->frameBoundingRect( doc.rootFrame() ) );
         QPolygon pr = transform.mapToPolygon( br.toRect() );
         // Using QPainterPath allows us to use intersects() (which has many early-exits)
         // instead of QPolygon::intersected (which calculates a slow and precise intersection polygon)
         QPainterPath path;
         path.addPolygon( pr );
 
         // iterate backwards because recently added items are more likely to overlap, so we spend
         // less time checking irrelevant items when there is overlap
         for ( int i = alreadyDrawnDataValueTexts.count() - 1; i >= 0; i-- ) {
             if ( alreadyDrawnDataValueTexts.at( i ).intersects( path ) ) {
                 // qDebug() << "not painting this label due to overlap";
                 drawIt = false;
                 break;
             }
         }
         if ( drawIt ) {
             alreadyDrawnDataValueTexts << path;
         }
     }
 
     if ( drawIt ) {
         QRectF rect = layout->frameBoundingRect( doc.rootFrame() );
         if ( cumulatedBoundingRect ) {
             (*cumulatedBoundingRect) |= transform.mapRect( rect );
         }
         if ( !justCalculateRect ) {
             bool paintBack = false;
             BackgroundAttributes back( attrs.backgroundAttributes() );
             if ( back.isVisible() ) {
                 paintBack = true;
                 painter->setBrush( back.brush() );
             } else {
                 painter->setBrush( QBrush() );
             }
 
             qreal radius = 0.0;
             FrameAttributes frame( attrs.frameAttributes() );
             if ( frame.isVisible() ) {
                 paintBack = true;
                 painter->setPen( frame.pen() );
                 radius = frame.cornerRadius();
             }
 
             if ( paintBack ) {
                 QRectF borderRect( QPointF( 0, 0 ), rect.size() );
                 painter->drawRoundedRect( borderRect, radius, radius );
             }
             layout->draw( painter, context );
         }
     }
 }
 
 QModelIndex AbstractDiagram::Private::indexAt( const QPoint& point ) const
 {
     QModelIndexList l = indexesAt( point );
     std::sort(l.begin(), l.end());
     if ( !l.isEmpty() )
         return l.first();
     else
         return QModelIndex();
 }
 
 QModelIndexList AbstractDiagram::Private::indexesAt( const QPoint& point ) const
 {
     return reverseMapper.indexesAt( point ); // which could be empty
 }
 
 QModelIndexList AbstractDiagram::Private::indexesIn( const QRect& rect ) const
 {
     return reverseMapper.indexesIn( rect );
 }
 
 CartesianDiagramDataCompressor::AggregatedDataValueAttributes AbstractDiagram::Private::aggregatedAttrs(
     const QModelIndex& index,
     const CartesianDiagramDataCompressor::CachePosition* position ) const
 {
     Q_UNUSED( position ); // used by cartesian diagrams only
     CartesianDiagramDataCompressor::AggregatedDataValueAttributes allAttrs;
     allAttrs[index] = diagram->dataValueAttributes( index );
     return allAttrs;
 }
 
 void AbstractDiagram::Private::setDatasetAttrs( int dataset, const QVariant& data, int role )
 {
     // To store attributes for a dataset, we use the first column
     // that's associated with it. (i.e., with a dataset dimension
     // of two, the column of the keys). In most cases however, there's
     // only one data dimension, and thus also only one column per data set.
     int column = dataset * datasetDimension;
 
     // For DataHiddenRole, also store the flag in the other data points that belong to this data set,
     // otherwise it's impossible to hide data points in a plotter diagram because there will always
     // be one model index that belongs to this data point that is not hidden.
     // For more details on how hiding works, see the data compressor.
     // Also see KDCH-503 for which this is a workaround.
     int columnSpan = role == DataHiddenRole ? datasetDimension : 1;
 
     for ( int i = 0; i < columnSpan; i++ ) {
         attributesModel->setHeaderData( column + i, Qt::Horizontal, data, role );
     }
 }
 
 QVariant AbstractDiagram::Private::datasetAttrs( int dataset, int role ) const
 {
     // See setDataSetAttrs for explanation of column
     int column = dataset * datasetDimension;
     return attributesModel->headerData( column, Qt::Horizontal, role );
 }
 
 void AbstractDiagram::Private::resetDatasetAttrs( int dataset, int role )
 {
     // See setDataSetAttrs for explanation of column
     int column = dataset * datasetDimension;
     attributesModel->resetHeaderData( column, Qt::Horizontal, role );
 }
 
 bool AbstractDiagram::Private::isTransposed() const
 {
      // Determine the diagram that specifies the orientation.
      // That diagram is the reference diagram, if it exists, or otherwise the diagram itself.
      // Note: In KChart 2.3 or earlier, only a bar diagram can be transposed.
      const AbstractCartesianDiagram* refDiagram = qobject_cast< const AbstractCartesianDiagram * >( diagram );
      if ( !refDiagram ) {
          return false;
      }
      if ( refDiagram->referenceDiagram() ) {
          refDiagram = refDiagram->referenceDiagram();
      }
      const BarDiagram* barDiagram = qobject_cast< const BarDiagram* >( refDiagram );
      if ( !barDiagram ) {
          return false;
      }
      return barDiagram->orientation() == Qt::Horizontal;
 }
 
 LineAttributesInfo::LineAttributesInfo()
 {
 }
 
 LineAttributesInfo::LineAttributesInfo( const QModelIndex& _index, const QPointF& _value, const QPointF& _nextValue )
     : index( _index )
     , value ( _value )
     , nextValue ( _nextValue )
 {
 }