Show RFT tornado plot labels at left side of the plot area

ApplicationLibCode/ProjectDataModel/CorrelationPlots/RimRftTornadoPlot.cpp

@@ -48,6 +48,12 @@
 
 CAF_PDM_SOURCE_INIT( RimRftTornadoPlot, "RftTornadoPlot" );
 
+namespace
+{
+constexpr double axisMinAbsolute = -0.7;
+constexpr double anchorMargin    = 0.03;
+} // namespace
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
@@ -225,8 +231,8 @@ void RimRftTornadoPlot::updateAxes()
     if ( m_showAbsoluteValues() )
     {
         m_plotWidget->setAxisTitleText( RiuPlotAxis::defaultBottom(), "Pearson Correlation Coefficient ABS" );
-        // Use a small negative margin so bar label text (anchored at x=0) remains visible
-        m_plotWidget->setAxisRange( RiuPlotAxis::defaultBottom(), -0.15, 1.0 );
+        // Leave room left of zero for the bar labels
+        m_plotWidget->setAxisRange( RiuPlotAxis::defaultBottom(), axisMinAbsolute, 1.0 );
     }
     else
     {
@@ -320,6 +326,10 @@ void RimRftTornadoPlot::onLoadDataAndUpdate()
         m_lastCorrelations  = addDataToChartBuilder( chartBuilder );
         const int labelSize = caf::FontTools::absolutePointSize( RiaPreferences::current()->defaultPlotFontSize(), m_labelFontSize() );
         chartBuilder.setLabelFontSize( labelSize );
+        // Labels start at the left edge of the plot, in the empty space left of the bars. The anchor must be slightly inside
+        // the axis range, as Qwt skips scale items positioned outside the canvas. Only used for absolute values, as signed
+        // values have bars on both sides of zero.
+        if ( m_showAbsoluteValues() ) chartBuilder.setBarTextAnchor( axisMinAbsolute + anchorMargin );
         RiuRftCorrelationPlotTools::addHorizontalBarChart( m_plotWidget, chartBuilder, m_showOnlyTopNCorrelations() ? m_topNFilterCount() : -1 );
         RimCorrelationBarChartTools::highlightSelectedParameterBar( m_plotWidget,
                                                                     m_selectedParameter,

ApplicationLibCode/UserInterface/AnalysisPlots/RiuGroupedBarChartBuilder.cpp

@@ -367,6 +367,8 @@ void RiuGroupedBarChartBuilder::setBarColor( const QColor& color )
 //--------------------------------------------------------------------------------------------------
 void RiuGroupedBarChartBuilder::addBarChartToPlot( QwtPlot* plot, Qt::Orientation barOrientation, int maxBarCount )
 {
+    const bool showBarTextAtAnchor = m_barTextAnchor.has_value() && barOrientation == Qt::Horizontal;
+
     const double majGroupSpacing = 1.6;
     const double midGroupSpacing = 0.5;
     const double minGroupSpacing = 0.2;
@@ -629,8 +631,19 @@ void RiuGroupedBarChartBuilder::addBarChartToPlot( QwtPlot* plot, Qt::Orientatio
         barPoints->push_back( { currentBarPosition, barDef.m_value } );
         if ( !barDef.m_barText.isEmpty() )
         {
+            QString barText = barDef.m_barText;
+            if ( showBarTextAtAnchor )
+            {
+                // Long labels are shortened in the middle to limit the space used inside the plot
+                const int maxLabelLength = 26;
+                if ( barText.size() > maxLabelLength )
+                {
+                    barText = barText.left( 10 ) + QString::fromUtf8( "…" ) + barText.right( maxLabelLength - 11 );
+                }
+            }
+
             positionedBarLabels[currentBarPosition] =
-                RiuBarChartScaleDraw::RiuBarChartTick( QwtScaleDiv::MinorTick, barDef.m_barText, barDef.m_value < 0.0 );
+                RiuBarChartScaleDraw::RiuBarChartTick( QwtScaleDiv::MinorTick, barText, !showBarTextAtAnchor && barDef.m_value < 0.0 );
         }
 
         // Increment the bar position for the next bar
@@ -797,12 +810,19 @@ void RiuGroupedBarChartBuilder::addBarChartToPlot( QwtPlot* plot, Qt::Orientatio
         QwtScaleDraw::Alignment alignment      = QwtScaleDraw::TopScale;
         double                  labelRotation  = -90.0;
         Qt::Alignment           labelAlignment = Qt::AlignVCenter | Qt::AlignRight;
+        double                  scalePosition  = 0.0;
         if ( barOrientation == Qt::Horizontal )
         {
             alignment     = QwtScaleDraw::RightScale;
             labelRotation = 0.0;
         }
 
+        if ( showBarTextAtAnchor )
+        {
+            // Labels start at the anchor position and extend to the right
+            scalePosition = *m_barTextAnchor;
+        }
+
         QwtScaleDiv barTextScaleDiv( 0, currentBarPosition );
         {
             QList<double> onBarTickPositions;
@@ -826,7 +846,7 @@ void RiuGroupedBarChartBuilder::addBarChartToPlot( QwtPlot* plot, Qt::Orientatio
         barTextScaleDrawer->setLabelRotation( labelRotation );
         barTextScaleDrawer->setLabelAlignment( labelAlignment );
 
-        QwtPlotScaleItem* barTextScale = new QwtPlotScaleItem( alignment, 0.0 );
+        QwtPlotScaleItem* barTextScale = new QwtPlotScaleItem( alignment, scalePosition );
         barTextScale->setScaleDraw( barTextScaleDrawer );
         barTextScale->setScaleDiv( barTextScaleDiv );
         barTextScale->attach( plot );
@@ -842,6 +862,14 @@ void RiuGroupedBarChartBuilder::setLabelFontSize( int labelPointSize )
     m_labelPointSize = labelPointSize;
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RiuGroupedBarChartBuilder::setBarTextAnchor( double valueAxisPosition )
+{
+    m_barTextAnchor = valueAxisPosition;
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------

ApplicationLibCode/UserInterface/AnalysisPlots/RiuGroupedBarChartBuilder.h

@@ -25,6 +25,7 @@
 
 #include <limits>
 #include <map>
+#include <optional>
 #include <set>
 
 class QwtPlot;
@@ -50,6 +51,10 @@ public:
     void addBarChartToPlot( QwtPlot* plot, Qt::Orientation orientation, int maxBarCount = -1 );
     void setLabelFontSize( int labelPointSize );
 
+    // For horizontal bar charts: left-align the bar texts at the given value axis position instead of
+    // placing them next to the bars
+    void setBarTextAnchor( double valueAxisPosition );
+
     QString plotContentAsText() const;
 
 private:
@@ -91,6 +96,7 @@ private:
     bool                    m_isSortingByMaxValueInGroups;
     int                     m_labelPointSize;
 
-    bool   m_useBarColor = false;
-    QColor m_barColor;
+    std::optional<double> m_barTextAnchor;
+    bool                  m_useBarColor = false;
+    QColor                m_barColor;
 };