Use QgsColorRampLegendNodeSettings to control settings for QgsColorRa…

…mpLegendNode items

python/core/auto_generated/layertree/qgscolorramplegendnode.sip.in

@@ -33,6 +33,21 @@ Constructor for QgsColorRampLegendNode.
 :param parent: attach a parent QObject to the legend node.
 %End
 
+    QgsColorRampLegendNode( QgsLayerTreeLayer *nodeLayer, QgsColorRamp *ramp /Transfer/,
+                            const QgsColorRampLegendNodeSettings &settings, double minimumValue,
+                            double maximumValue, QObject *parent /TransferThis/ = 0 );
+%Docstring
+Constructor for QgsColorRampLegendNode.
+
+:param nodeLayer: layer node
+:param ramp: color ramp to render in node. Ownership is transferred to the node.
+:param settings: node settings
+:param minimumValue: value associated with minimum of ramp
+:param maximumValue: value associated with maximum of ramp
+:param parent: attach a parent QObject to the legend node.
+%End
+
+
     virtual QVariant data( int role ) const;
 
     virtual QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const;
@@ -59,6 +74,8 @@ Returns the color ramp used by the node.
 
 };
 
+
+
 /************************************************************************
  * This file has been generated automatically from                      *
  *                                                                      *

src/core/layertree/qgscolorramplegendnode.cpp

@@ -20,13 +20,33 @@
 #include "qgssymbollayerutils.h"
 #include "qgsexpressioncontextutils.h"
 #include "qgstextrenderer.h"
+#include "qgsnumericformat.h"
 
 QgsColorRampLegendNode::QgsColorRampLegendNode( QgsLayerTreeLayer *nodeLayer, QgsColorRamp *ramp, const QString &minimumLabel, const QString &maximumLabel, QObject *parent )
   : QgsLayerTreeModelLegendNode( nodeLayer, parent )
   , mRamp( ramp )
-  , mMinimumLabel( minimumLabel )
-  , mMaximumLabel( maximumLabel )
 {
+  mSettings.setMinimumLabel( minimumLabel );
+  mSettings.setMaximumLabel( maximumLabel );
+
+  const int iconSize = QgsLayerTreeModel::scaleIconSize( 16 );
+  mIconSize = QSize( iconSize, iconSize * 6 );
+
+  connect( nodeLayer, &QObject::destroyed, this, [ = ]() { mLayerNode = nullptr; } );
+}
+
+QgsColorRampLegendNode::QgsColorRampLegendNode( QgsLayerTreeLayer *nodeLayer, QgsColorRamp *ramp, const QgsColorRampLegendNodeSettings &settings, double minimumValue, double maximumValue, QObject *parent )
+  : QgsLayerTreeModelLegendNode( nodeLayer, parent )
+  , mRamp( ramp )
+  , mSettings( settings )
+{
+  QgsNumericFormatContext numericContext;
+  if ( mSettings.minimumLabel().isEmpty() )
+    mSettings.setMinimumLabel( settings.numericFormat()->formatDouble( minimumValue, numericContext ) );
+
+  if ( mSettings.maximumLabel().isEmpty() )
+    mSettings.setMaximumLabel( settings.numericFormat()->formatDouble( maximumValue, numericContext ) );
+
   const int iconSize = QgsLayerTreeModel::scaleIconSize( 16 );
   mIconSize = QSize( iconSize, iconSize * 6 );
 
@@ -56,7 +76,7 @@ QVariant QgsColorRampLegendNode::data( int role ) const
 
       if ( mRamp )
       {
-        pix = QgsSymbolLayerUtils::colorRampPreviewPixmap( mRamp.get(), mIconSize, 0, Qt::Vertical, true, false );
+        pix = QgsSymbolLayerUtils::colorRampPreviewPixmap( mRamp.get(), mIconSize, 0, Qt::Vertical, mSettings.direction() != QgsColorRampLegendNodeSettings::MaximumToMinimum, false );
       }
       else
       {
@@ -67,7 +87,7 @@ QVariant QgsColorRampLegendNode::data( int role ) const
       const QFont font = data( Qt::FontRole ).value< QFont >();
 
       const QFontMetrics fm( font );
-      const int maxTextWidth = std::max( fm.boundingRect( mMinimumLabel ).width(), fm.boundingRect( mMaximumLabel ).width() );
+      const int maxTextWidth = std::max( fm.boundingRect( mSettings.minimumLabel() ).width(), fm.boundingRect( mSettings.maximumLabel() ).width() );
       const int labelGapFromRamp = fm.boundingRect( QStringLiteral( "x" ) ).width();
       const int extraAllowance = labelGapFromRamp * 0.4; // extra allowance to avoid text clipping on right
       const QRect labelRect( mIconSize.width() + labelGapFromRamp, 0, maxTextWidth + extraAllowance, mIconSize.height() );
@@ -79,8 +99,8 @@ QVariant QgsColorRampLegendNode::data( int role ) const
       p.drawPixmap( 0, 0, pix );
       p.setFont( font );
 
-      p.drawText( labelRect, Qt::AlignTop | Qt::AlignLeft, mMaximumLabel );
-      p.drawText( labelRect, Qt::AlignBottom | Qt::AlignLeft, mMinimumLabel );
+      p.drawText( labelRect, Qt::AlignBottom | Qt::AlignLeft, mSettings.direction() == QgsColorRampLegendNodeSettings::MinimumToMaximum ? mSettings.minimumLabel() : mSettings.maximumLabel() );
+      p.drawText( labelRect, Qt::AlignTop | Qt::AlignLeft, mSettings.direction() == QgsColorRampLegendNodeSettings::MinimumToMaximum ? mSettings.maximumLabel() : mSettings.minimumLabel() );
       p.end();
     }
     return mPixmap;
@@ -129,7 +149,7 @@ QSizeF QgsColorRampLegendNode::drawSymbol( const QgsLegendSettings &settings, It
   QgsTextFormat format = QgsTextFormat::fromQFont( symbolLabelFont );
   format.setColor( settings.fontColor() );
 
-  double minHeightMm = QgsTextRenderer::textHeight( *context, format, QStringList() << mMinimumLabel << mMaximumLabel, QgsTextRenderer::Rect ) / context->scaleFactor();
+  double minHeightMm = QgsTextRenderer::textHeight( *context, format, QStringList() << mSettings.minimumLabel() << mSettings.maximumLabel(), QgsTextRenderer::Rect ) / context->scaleFactor();
 
   const double height = ctx && ctx->patchSize.height() > 0 ? std::max( minHeightMm / 2, ctx->patchSize.height() ) : std::max( minHeightMm, settings.symbolSize().height() );
   const double width = ctx && ctx->patchSize.width() > 0 ? ctx->patchSize.width() : settings.symbolSize().width();
@@ -165,7 +185,11 @@ QSizeF QgsColorRampLegendNode::drawSymbol( const QgsLegendSettings &settings, It
 
     p->scale( 1.0 / dotsPerMM, 1.0 / dotsPerMM );
 
-    QLinearGradient gradient( 0, rampTopMm * dotsPerMM, 0, rampTopMm * dotsPerMM + height * dotsPerMM );
+    const double gradientTop = rampTopMm * dotsPerMM;
+    const double gradientBottom = gradientTop + height * dotsPerMM;
+
+    QLinearGradient gradient( 0, mSettings.direction() == QgsColorRampLegendNodeSettings::MinimumToMaximum ? gradientBottom : gradientTop,
+                              0, mSettings.direction() == QgsColorRampLegendNodeSettings::MinimumToMaximum ? gradientTop : gradientBottom );
     if ( mRamp->type() == QgsGradientColorRamp::typeString() || mRamp->type() == QgsCptCityColorRamp::typeString() )
     {
       //color ramp gradient
@@ -213,11 +237,17 @@ QSizeF QgsColorRampLegendNode::drawSymbol( const QgsLegendSettings &settings, It
     }
 
     const QRectF textRect( labelXMin * dotsPerMM, currentYCoord * dotsPerMM, ( labelXMax - labelXMin ) * dotsPerMM, height * dotsPerMM );
-    QgsTextRenderer::drawText( textRect, 0, QgsTextRenderer::convertQtHAlignment( settings.style( QgsLegendStyle::SymbolLabel ).alignment() ), QStringList() << mMaximumLabel, *context, format, true, QgsTextRenderer::AlignTop );
-    QgsTextRenderer::drawText( textRect, 0, QgsTextRenderer::convertQtHAlignment( settings.style( QgsLegendStyle::SymbolLabel ).alignment() ), QStringList() << mMinimumLabel, *context, format, true, QgsTextRenderer::AlignBottom );
+    QgsTextRenderer::drawText( textRect, 0, QgsTextRenderer::convertQtHAlignment( settings.style( QgsLegendStyle::SymbolLabel ).alignment() ),
+                               QStringList() << ( mSettings.direction() == QgsColorRampLegendNodeSettings::MinimumToMaximum ? mSettings.maximumLabel() : mSettings.minimumLabel() ),
+                               *context, format, true, QgsTextRenderer::AlignTop );
+    QgsTextRenderer::drawText( textRect, 0, QgsTextRenderer::convertQtHAlignment( settings.style( QgsLegendStyle::SymbolLabel ).alignment() ),
+                               QStringList() << ( mSettings.direction() == QgsColorRampLegendNodeSettings::MinimumToMaximum ? mSettings.minimumLabel() : mSettings.maximumLabel() ),
+                               *context, format, true, QgsTextRenderer::AlignBottom );
   }
 
   return QSizeF( width, height );
 }
 
 
+
+

src/core/layertree/qgscolorramplegendnode.h

@@ -21,6 +21,7 @@
 #include "qgslayertreemodellegendnode.h"
 #include "qgslegendsymbolitem.h"
 #include "qgstextformat.h"
+#include "qgscolorramplegendnodesettings.h"
 
 /**
  * \ingroup core
@@ -46,6 +47,20 @@ class CORE_EXPORT QgsColorRampLegendNode : public QgsLayerTreeModelLegendNode
     QgsColorRampLegendNode( QgsLayerTreeLayer *nodeLayer, QgsColorRamp *ramp SIP_TRANSFER,
                             const QString &minimumLabel, const QString &maximumLabel, QObject *parent SIP_TRANSFERTHIS = nullptr );
 
+    /**
+     * Constructor for QgsColorRampLegendNode.
+     * \param nodeLayer layer node
+     * \param ramp color ramp to render in node. Ownership is transferred to the node.
+     * \param settings node settings
+     * \param minimumValue value associated with minimum of ramp
+     * \param maximumValue value associated with maximum of ramp
+     * \param parent attach a parent QObject to the legend node.
+     */
+    QgsColorRampLegendNode( QgsLayerTreeLayer *nodeLayer, QgsColorRamp *ramp SIP_TRANSFER,
+                            const QgsColorRampLegendNodeSettings &settings, double minimumValue,
+                            double maximumValue, QObject *parent SIP_TRANSFERTHIS = nullptr );
+
+
     QVariant data( int role ) const override;
     QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const override;
 
@@ -72,13 +87,12 @@ class CORE_EXPORT QgsColorRampLegendNode : public QgsLayerTreeModelLegendNode
     std::unique_ptr< QgsColorRamp > mRamp;
 
     mutable QPixmap mPixmap; // cached symbol preview
-    QString mMinimumLabel;
-    QString mMaximumLabel;
-
     QSize mIconSize;
 
-    QgsTextFormat mTextFormat;
+    QgsColorRampLegendNodeSettings mSettings;
 
 };
 
+
+
 #endif // QGSCOLORRAMPLEGENDNODE_H

src/core/pointcloud/qgspointcloudattributebyramprenderer.cpp

@@ -181,8 +181,9 @@ QList<QgsLayerTreeModelLegendNode *> QgsPointCloudAttributeByRampRenderer::creat
     case QgsColorRampShader::Interpolated:
       // for interpolated shaders we use a ramp legend node
       res << new QgsColorRampLegendNode( nodeLayer, mColorRampShader.sourceColorRamp()->clone(),
-                                         QString::number( mColorRampShader.minimumValue() ),
-                                         QString::number( mColorRampShader.maximumValue() ) );
+                                         mColorRampShader.legendSettings() ? *mColorRampShader.legendSettings() : QgsColorRampLegendNodeSettings(),
+                                         mColorRampShader.minimumValue(),
+                                         mColorRampShader.maximumValue() );
       break;
 
     case QgsColorRampShader::Discrete:

src/core/qgsmaplayerlegend.cpp

@@ -478,8 +478,9 @@ QList<QgsLayerTreeModelLegendNode *> QgsDefaultMeshLayerLegend::createLayerTreeM
       case QgsColorRampShader::Interpolated:
         // for interpolated shaders we use a ramp legend node
         nodes << new QgsColorRampLegendNode( nodeLayer, shader.sourceColorRamp()->clone(),
-                                             QString::number( shader.minimumValue() ),
-                                             QString::number( shader.maximumValue() ) );
+                                             shader.legendSettings() ? *shader.legendSettings() : QgsColorRampLegendNodeSettings(),
+                                             shader.minimumValue(),
+                                             shader.maximumValue() );
         break;
 
       case QgsColorRampShader::Discrete:

src/core/raster/qgssinglebandpseudocolorrenderer.cpp

@@ -443,8 +443,8 @@ QList<QgsLayerTreeModelLegendNode *> QgsSingleBandPseudoColorRenderer::createLeg
     case QgsColorRampShader::Interpolated:
       // for interpolated shaders we use a ramp legend node
       res << new QgsColorRampLegendNode( nodeLayer, rampShader->sourceColorRamp()->clone(),
-                                         QString::number( rampShader->minimumValue() ),
-                                         QString::number( rampShader->maximumValue() ) );
+                                         rampShader->legendSettings() ? *rampShader->legendSettings() : QgsColorRampLegendNodeSettings(),
+                                         rampShader->minimumValue(), rampShader->maximumValue() );
       break;
 
     case QgsColorRampShader::Discrete: