disambiguate fct -> centralValue

GUI/Model/Beam/BeamDistributionItem.cpp

@@ -50,12 +50,9 @@ void BeamDistributionItem::readFrom(QXmlStreamReader* r)
     }
 }
 
-double BeamDistributionItem::meanValue() const
+double BeamDistributionItem::centralValue() const
 {
-    std::unique_ptr<IDistribution1D> domainDistr = distributionItem()->createDistribution(1.);
-    if (domainDistr)
-        return domainDistr->mean();
-    return dynamic_cast<SymmetricDistributionItem*>(distributionItem())->mean().dVal();
+    return distributionItem()->center().dVal();
 }
 
 void BeamDistributionItem::resetToValue(double value)

GUI/Model/Beam/BeamDistributionItem.h

@@ -31,7 +31,7 @@ public:
     virtual void writeTo(QXmlStreamWriter* w) const;
     virtual void readFrom(QXmlStreamReader* r);
 
-    virtual double meanValue() const;
+    virtual double centralValue() const;
     void resetToValue(double value);
 
     virtual double scaleFactor() const;

GUI/Model/Beam/SourceItems.cpp

@@ -201,9 +201,9 @@ BeamDistributionItem* BeamItem::inclinationAngleItem() const
 
 std::unique_ptr<Beam> BeamItem::createBeam() const
 {
-    double lambda = wavelengthItem()->meanValue();
-    double inclination_angle = Units::deg2rad(inclinationAngleItem()->meanValue());
-    double azimuthal_angle = Units::deg2rad(azimuthalAngleItem()->meanValue());
+    double lambda = wavelengthItem()->centralValue();
+    double inclination_angle = Units::deg2rad(inclinationAngleItem()->centralValue());
+    double azimuthal_angle = Units::deg2rad(azimuthalAngleItem()->centralValue());
 
     auto result =
         std::make_unique<Beam>(intensity().dVal(), lambda, inclination_angle, azimuthal_angle);

GUI/Model/Sim/InstrumentItems.cpp

@@ -191,7 +191,7 @@ std::unique_ptr<PhysicalScan> ScanningInstrumentItem::createScan(const Scale& ax
     auto result = std::make_unique<AlphaScan>(axis);
 
     result->setIntensity(scanItem()->intensity().dVal());
-    result->setWavelength(scanItem()->wavelengthItem()->meanValue());
+    result->setWavelength(scanItem()->wavelengthItem()->centralValue());
 
     FootprintCatalog::BaseItem* const footprint_item =
         scanItem()->footprintSelection().certainItem();
@@ -456,7 +456,7 @@ std::unique_ptr<Frame> SpecularInstrumentItem::createFrame() const
             return {};
 
         if (pAxis->unit() == "1/nm") {
-            double lambda = scanItem()->wavelengthItem()->meanValue();
+            double lambda = scanItem()->wavelengthItem()->centralValue();
             Scale ax =
                 pAxis->transformedScale(Coordinate("alpha_i", "rad").label(), [lambda](double qz) {
                     return std::asin(qz * lambda / 4 / pi);