Rename RimWellLogDiffCurve to RimWellLogCalculatedCurve and additional improvements

* Rename from DiffCurve to CalculatedCurve and add operators selection
* Add option to select depth source for resampling in CalculatedCurve

- Select source for depth values for resampling
- Depths from first curve, second curve or union of these
- Added unit tests for function creating union depth values and calculate value with selected operator.

* Guard divide by zero

* Adjust algorithm for union of depths

- Prevent duplicated depth values (no need for enter/exist of k-layer when resampling)
- Add threshold for depth distance
- Update unit tests

ApplicationLibCode/ProjectDataModel/WellLog/RimWellLogCalculatedCurve.h

@@ -0,0 +1,96 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2023-     Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+#include "RimWellLogCurve.h"
+
+#include "cafPdmPtrField.h"
+#include "cvfObject.h"
+
+class RimCase;
+class RimWellPath;
+
+//==================================================================================================
+///
+///
+//==================================================================================================
+class RimWellLogCalculatedCurve : public RimWellLogCurve
+{
+    CAF_PDM_HEADER_INIT;
+
+public:
+    enum class Operators
+    {
+        ADD,
+        SUBTRACT,
+        DIVIDE,
+        MULTIPLY
+    };
+    enum class DepthSource
+    {
+        FIRST,
+        SECOND,
+        UNION
+    };
+
+public:
+    RimWellLogCalculatedCurve();
+    ~RimWellLogCalculatedCurve() override;
+
+    void setOperator( Operators operatorValue );
+    void setWellLogCurves( RimWellLogCurve* firstWellLogCurve, RimWellLogCurve* secondWellLogCurve );
+
+    // Inherited via RimWellLogCurve
+    QString wellName() const override;
+    QString wellLogChannelUiName() const override;
+    QString wellLogChannelUnits() const override;
+
+    static double calculateValue( double firstValue, double secondValue, Operators operatorValue );
+    static std::vector<double>
+        unionDepthValuesFromVectors( const std::vector<double>& firstDepths, const std::vector<double>& secondDepths, double threshold );
+
+protected:
+    void defineUiOrdering( QString uiConfigName, caf::PdmUiOrdering& uiOrdering ) override;
+    void defineUiTreeOrdering( caf::PdmUiTreeOrdering& uiTreeOrdering, QString uiConfigName = "" ) override;
+    void fieldChangedByUi( const caf::PdmFieldHandle* changedField, const QVariant& oldValue, const QVariant& newValue ) override;
+    QList<caf::PdmOptionItemInfo> calculateValueOptions( const caf::PdmFieldHandle* fieldNeedingOptions ) override;
+
+private:
+    // Inherited via RimWellLogCurve
+    QString createCurveAutoName() override;
+    void    onLoadDataAndUpdate( bool updateParentPlot ) override;
+
+    void setAutomaticName();
+
+    void onWellLogCurveChanged( const SignalEmitter* emitter );
+    void connectWellLogCurveChangedToSlots( RimWellLogCurve* wellLogCurve );
+    void disconnectWellLogCurveChangedFromSlots( RimWellLogCurve* wellLogCurve );
+
+    std::vector<double> depthValuesFromSource( RiaDefines::DepthTypeEnum depthType ) const;
+    std::vector<double> unionDepthValuesFromCurves( RiaDefines::DepthTypeEnum depthType ) const;
+
+private:
+    caf::PdmPtrField<RimCase*> m_case;
+
+    caf::PdmField<caf::AppEnum<Operators>>   m_operator;
+    caf::PdmField<caf::AppEnum<DepthSource>> m_depthSource;
+
+    caf::PdmPtrField<RimWellLogCurve*> m_firstWellLogCurve;
+    caf::PdmPtrField<RimWellLogCurve*> m_secondWellLogCurve;
+};