calculate mMmPerMapUnit with mapUnitsPerPixel to avoid to have redundant info

Author: signedav

src/core/layertree/qgslayertreemodellegendnode.cpp

@@ -395,7 +395,7 @@ QSizeF QgsSymbolLegendNode::drawSymbol( const QgsLegendSettings &settings, ItemC
   QgsRenderContext context;
   context.setScaleFactor( settings.dpi() / 25.4 );
   context.setRendererScale( settings.mapScale() );
-  context.setMapToPixel( QgsMapToPixel( settings.mapUnitsPerPixel() == 1 ? 1 / ( settings.mmPerMapUnit() * context.scaleFactor() ) : settings.mapUnitsPerPixel() ) );
+  context.setMapToPixel( QgsMapToPixel( 1 / ( settings.mmPerMapUnit() * context.scaleFactor() ) ) );
   context.setForceVectorOutput( true );
   context.setPainter( ctx ? ctx->painter : nullptr );
 

src/core/qgslegendsettings.cpp

@@ -37,6 +37,16 @@ QgsLegendSettings::QgsLegendSettings()
   rstyle( QgsLegendStyle::SymbolLabel ).rfont().setPointSizeF( 12.0 );
 }
 
+double QgsLegendSettings::mapUnitsPerPixel() const
+{
+  return 1 / ( mMmPerMapUnit * ( mDpi / 25.4 ) );
+}
+
+void QgsLegendSettings::setMapUnitsPerPixel( double mapUnitsPerPixel )
+{
+  mMmPerMapUnit = 1 / mapUnitsPerPixel / ( mDpi / 25.4 );
+}
+
 QStringList QgsLegendSettings::evaluateItemText( const QString &text, const QgsExpressionContext &context ) const
 {
   const QString textToRender = QgsExpression::replaceExpressionText( text, &context );

src/core/qgslegendsettings.h

@@ -179,16 +179,16 @@ class CORE_EXPORT QgsLegendSettings
     void setMapScale( double scale ) { mMapScale = scale; }
 
     /**
-     * Returns the factor of map units per pixel used for symbol sized by map units.
-     * \see setMapScale()
+     * Returns the factor of map units per pixel for symbols with size given in map units calculated by mDpi and mMmPerMapUnit
+     * \see setMapUnitsPerPixel()
      */
-    double mapUnitsPerPixel() const { return mMapUnitsPerPixel; }
+    double mapUnitsPerPixel() const;
 
     /**
-     * Sets the map units per pixel \a mapUnitsPerPixel mostly taken from the map settings.
+     * Sets the the mMmPerMapUnit calculated by \a mapUnitsPerPixel mostly taken from the map settings.
      * \see mapUnitsPerPixel()
      */
-    void setMapUnitsPerPixel( double mapUnitsPerPixel ) { mMapUnitsPerPixel = mapUnitsPerPixel; }
+    void setMapUnitsPerPixel( double mapUnitsPerPixel );
 
     int dpi() const { return mDpi; }
     void setDpi( int dpi ) { mDpi = dpi; }
@@ -302,9 +302,6 @@ class CORE_EXPORT QgsLegendSettings
     //! Denominator of map's scale
     double mMapScale = 1;
 
-    //! the map units per pixel given by the map parameters - for symbols with size given in map units
-    double mMapUnitsPerPixel = 1;
-
     //! DPI to be used when rendering legend
     int mDpi = 96;
 };

src/server/services/wms/qgswmsrenderer.cpp

@@ -184,13 +184,13 @@ namespace QgsWms
     std::unique_ptr<QPainter> painter;
 
     // getting scale from bbox
-    if( !mWmsParameters.bbox().isEmpty() )
+    if ( !mWmsParameters.bbox().isEmpty() )
     {
-        QgsMapSettings mapSettings;
-        image.reset( createImage( mWmsParameters.widthAsInt(), mWmsParameters.heightAsInt(), false ) );
-        configureMapSettings( image.get(), mapSettings );
-        legendSettings.setMapScale( mapSettings.scale() );
-        legendSettings.setMapUnitsPerPixel( mapSettings.mapUnitsPerPixel() );
+      QgsMapSettings mapSettings;
+      image.reset( createImage( mWmsParameters.widthAsInt(), mWmsParameters.heightAsInt(), false ) );
+      configureMapSettings( image.get(), mapSettings );
+      legendSettings.setMapScale( mapSettings.scale() );
+      legendSettings.setMapUnitsPerPixel( mapSettings.mapUnitsPerPixel() );
     }
 
     if ( !mWmsParameters.rule().isEmpty() )