From: jfa <jfa@opencascade.com>
Date: Fri, 8 Feb 2013 12:40:16 +0000 (+0000)
Subject: 0021840: [CEA 655] Scalar bar: using a logarithmic scale
X-Git-Tag: pluginMGCleaner~132
X-Git-Url: http://git.salome-platform.org/gitweb/?a=commitdiff_plain;h=aea880cf9e484e6750390eb69343106e15614f00;p=modules%2Fsmesh.git

0021840: [CEA 655] Scalar bar: using a logarithmic scale
---

diff --git a/doc/salome/gui/SMESH/images/scalar_bar_dlg.png b/doc/salome/gui/SMESH/images/scalar_bar_dlg.png
index 59ca53065..564689ad9 100755
Binary files a/doc/salome/gui/SMESH/images/scalar_bar_dlg.png and b/doc/salome/gui/SMESH/images/scalar_bar_dlg.png differ
diff --git a/doc/salome/gui/SMESH/input/scalar_bar.doc b/doc/salome/gui/SMESH/input/scalar_bar.doc
index 146a7fa78..7ef8da51d 100755
--- a/doc/salome/gui/SMESH/input/scalar_bar.doc
+++ b/doc/salome/gui/SMESH/input/scalar_bar.doc
@@ -7,8 +7,12 @@ In this dialog you can specify the properties of the scalar bar
 \image html scalar_bar_dlg.png
 
 <ul>
-<li><b>Scalar Range</b> in this menu you can specify 
-<b>Min value</b> and <b>Max value</b> of the <b>Scalar Bar</b> </li>
+<li><b>Scalar Range</b> - in this menu you can specify 
+<b>Min value</b> and <b>Max value</b> of the <b>Scalar Bar</b>, and
+also you can turn on/off <b>Logarithmic</b> scaling of the scalar bar.</li>
+
+\note <b>Logarithmic scale</b> is not applicable in case of
+negative and zero values in the range. In such cases it is disabled.
 
 <li><b>Font</b> - in this menu you can set type, face and color for
 the font of <b>Title</b> and <b>Labels</b> of the <b>Scalar
@@ -29,7 +33,7 @@ location (<b>X</b> and <b>Y</b>) and size (<b>Width</b> and
 side)</li>
 <li><b>Y</b>: ordinate of the origin (from the bottom)</li>
 </ul>
-<li><b>Distribution</b> in this menu you can Show/Hide distribution histogram of the values of the <b>Scalar Bar</b> and specify histogram properties</li>
+<li><b>Distribution</b> - in this menu you can Show/Hide distribution histogram of the values of the <b>Scalar Bar</b> and specify histogram properties</li>
 <ul>
 <li><b>Multicolor</b> the histogram is colored as <b>Scalar Bar</b></li>
 <li><b>Monocolor</b> the histogram is colored as selected with <b>Distribution color</b> selector</li>
diff --git a/idl/SMESH_Filter.idl b/idl/SMESH_Filter.idl
index 8cc7bc864..2c701fc2b 100644
--- a/idl/SMESH_Filter.idl
+++ b/idl/SMESH_Filter.idl
@@ -115,7 +115,7 @@ module SMESH
   {
     double GetValue( in long theElementId );
 
-    Histogram GetHistogram( in short nbIntervals );
+    Histogram GetHistogram( in short nbIntervals, in boolean isLogarithmic );
 
     /*!
     * Set precision for calculation. It is a position after point which is
diff --git a/src/Controls/SMESH_Controls.cxx b/src/Controls/SMESH_Controls.cxx
index 2b8d3c695..239aa41e4 100644
--- a/src/Controls/SMESH_Controls.cxx
+++ b/src/Controls/SMESH_Controls.cxx
@@ -18,7 +18,6 @@
 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 //
 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
-//
 
 #include "SMESH_ControlsDef.hxx"
 
@@ -322,12 +321,12 @@ double NumericalFunctor::Round( const double & aVal )
  *  \param minmax - boundaries of diapason of values to divide into intervals
  */
 //================================================================================
-
 void NumericalFunctor::GetHistogram(int                  nbIntervals,
                                     std::vector<int>&    nbEvents,
                                     std::vector<double>& funValues,
                                     const vector<int>&   elements,
-                                    const double*        minmax)
+                                    const double*        minmax,
+                                    const bool           isLogarithmic)
 {
   if ( nbIntervals < 1 ||
        !myMesh ||
@@ -380,8 +379,15 @@ void NumericalFunctor::GetHistogram(int                  nbIntervals,
   for ( int i = 0; i < nbIntervals; ++i )
   {
     // find end value of i-th interval
-    double r = (i+1) / double( nbIntervals );
-    funValues[i+1] = funValues.front() * (1-r) + funValues.back() * r;
+    double r = (i+1) / double(nbIntervals);
+    if (isLogarithmic && funValues.front() > 1e-07 && funValues.back() > 1e-07) {
+      double logmin = log10(funValues.front());
+      double lval = logmin + r * (log10(funValues.back()) - logmin);
+      funValues[i+1] = pow(10.0, lval);
+    }
+    else {
+      funValues[i+1] = funValues.front() * (1-r) + funValues.back() * r;
+    }
 
     // count values in the i-th interval if there are any
     if ( min != values.end() && *min <= funValues[i+1] )
diff --git a/src/Controls/SMESH_ControlsDef.hxx b/src/Controls/SMESH_ControlsDef.hxx
index a0e984cdd..9b9c26525 100644
--- a/src/Controls/SMESH_ControlsDef.hxx
+++ b/src/Controls/SMESH_ControlsDef.hxx
@@ -125,7 +125,8 @@ namespace SMESH{
                         std::vector<int>&       nbEvents,
                         std::vector<double>&    funValues,
                         const std::vector<int>& elements,
-                        const double*           minmax=0);
+                        const double*           minmax=0,
+                        const bool              isLogarithmic = false);
       virtual SMDSAbs_ElementType GetType() const = 0;
       virtual double GetBadRate( double Value, int nbNodes ) const = 0;
       long  GetPrecision() const;
diff --git a/src/OBJECT/SMESH_Actor.cxx b/src/OBJECT/SMESH_Actor.cxx
index 933f34c56..3ae80f7a1 100644
--- a/src/OBJECT/SMESH_Actor.cxx
+++ b/src/OBJECT/SMESH_Actor.cxx
@@ -18,13 +18,12 @@
 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 //
 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
-//
 
 //  SMESH OBJECT : interactive object for SMESH visualization
 //  File   : SMESH_Actor.cxx
 //  Author : Nicolas REJNERI
 //  Module : SMESH
-//
+
 #include "SMESH_ActorDef.h"
 #include "SMESH_ActorUtils.h"
 #include "SMESH_DeviceActor.h"
@@ -99,8 +98,8 @@ SMESH_ActorDef* SMESH_ActorDef::New(){
 }
 
 
-SMESH_Actor* SMESH_Actor::New(TVisualObjPtr theVisualObj, 
-                              const char* theEntry, 
+SMESH_Actor* SMESH_Actor::New(TVisualObjPtr theVisualObj,
+                              const char* theEntry,
                               const char* theName,
                               int theIsClear)
 {
@@ -120,7 +119,7 @@ SMESH_Actor* SMESH_Actor::New(TVisualObjPtr theVisualObj,
 
 SMESH_ActorDef::SMESH_ActorDef()
 {
-  if(MYDEBUG) MESSAGE("SMESH_ActorDef - "<<this);  
+  if(MYDEBUG) MESSAGE("SMESH_ActorDef - "<<this);
   myBaseActor = SMESH_DeviceActor::New();
 
   myTimeStamp = vtkTimeStamp::New();
@@ -161,10 +160,10 @@ SMESH_ActorDef::SMESH_ActorDef()
     QFont f = mgr->fontValue( "SMESH", "numbering_node_font" );
     if ( f.family()      == "Arial" )   aFamilyNd = SMESH::FntArial;
     else if ( f.family() == "Courier" ) aFamilyNd = SMESH::FntCourier;
-    else if ( f.family() == "Times" )   aFamilyNd = SMESH::FntTimes;    
-    aBoldNd    = f.bold();    
-    anItalicNd = f.italic();   
-    aShadowNd  = f.overline();   
+    else if ( f.family() == "Times" )   aFamilyNd = SMESH::FntTimes;
+    aBoldNd    = f.bold();
+    anItalicNd = f.italic();
+    aShadowNd  = f.overline();
     aSizeNd    = f.pointSize();
   }
   vtkFloatingPointType anRGBNd[3] = {1,1,1};
@@ -179,10 +178,10 @@ SMESH_ActorDef::SMESH_ActorDef()
     QFont f = mgr->fontValue( "SMESH", "numbering_elem_font" );
     if ( f.family()      == "Arial" )   aFamilyEl = SMESH::FntArial;
     else if ( f.family() == "Courier" ) aFamilyEl = SMESH::FntCourier;
-    else if ( f.family() == "Times" )   aFamilyEl = SMESH::FntTimes;    
+    else if ( f.family() == "Times" )   aFamilyEl = SMESH::FntTimes;
     aBoldEl    = f.bold();
     anItalicEl = f.italic();
-    aShadowEl  = f.overline();    
+    aShadowEl  = f.overline();
     aSizeEl    = f.pointSize();
   }
   vtkFloatingPointType anRGBEl[3] = {0,1,0};
@@ -218,7 +217,7 @@ SMESH_ActorDef::SMESH_ActorDef()
   my2DActor->SetStoreGemetryMapping(true);
   my2DActor->SetUserMatrix(aMatrix);
   my2DActor->PickableOff();
-  my2DActor->SetFontProperties( aFamilyEl, aSizeEl, aBoldEl, anItalicEl, aShadowEl, anRGBEl[0], anRGBEl[1], anRGBEl[2] ); 
+  my2DActor->SetFontProperties( aFamilyEl, aSizeEl, aBoldEl, anItalicEl, aShadowEl, anRGBEl[0], anRGBEl[1], anRGBEl[2] );
   my2DActor->SetProperty(mySurfaceProp);
   my2DActor->SetBackfaceProperty(myBackSurfaceProp);
   my2DActor->SetRepresentation(SMESH_DeviceActor::eSurface);
@@ -257,7 +256,7 @@ SMESH_ActorDef::SMESH_ActorDef()
   my3DActor->SetStoreGemetryMapping(true);
   my3DActor->SetUserMatrix(aMatrix);
   my3DActor->PickableOff();
-  my3DActor->SetFontProperties( aFamilyEl, aSizeEl, aBoldEl, anItalicEl, aShadowEl, anRGBEl[0], anRGBEl[1], anRGBEl[2] ); 
+  my3DActor->SetFontProperties( aFamilyEl, aSizeEl, aBoldEl, anItalicEl, aShadowEl, anRGBEl[0], anRGBEl[1], anRGBEl[2] );
   my3DActor->SetProperty(myNormalVProp);
   my3DActor->SetBackfaceProperty(myReversedVProp);
   my3DActor->SetRepresentation(SMESH_DeviceActor::eSurface);
@@ -339,7 +338,7 @@ SMESH_ActorDef::SMESH_ActorDef()
   my1DProp->DeepCopy(myEdgeProp);
   my1DProp->SetLineWidth(aLineWidth + aLineWidthInc);
   my1DProp->SetPointSize(aElem0DSize);
-  
+
   my1DExtProp = vtkProperty::New();
   my1DExtProp->DeepCopy(myEdgeProp);
   anRGB[0] = 1 - anRGB[0];
@@ -381,7 +380,7 @@ SMESH_ActorDef::SMESH_ActorDef()
   //aFilter->SetModeOfExtraction(VTKViewer_ExtractUnstructuredGrid::ePoints);
   aFilter->SetModeOfChanging(VTKViewer_ExtractUnstructuredGrid::eAdding);
   aFilter->RegisterCellsWithType(VTK_VERTEX);
-  
+
   //Definition 0D device of the actor (ball elements)
   //-----------------------------------------------
   myBallProp = vtkProperty::New();
@@ -393,14 +392,14 @@ SMESH_ActorDef::SMESH_ActorDef()
   myBallActor->SetUserMatrix(aMatrix);
   myBallActor->SetStoreGemetryMapping(true);
   myBallActor->PickableOff();
-  myBallActor->SetFontProperties( aFamilyEl, aSizeEl, aBoldEl, anItalicEl, aShadowEl, anRGBEl[0], anRGBEl[1], anRGBEl[2] );  
+  myBallActor->SetFontProperties( aFamilyEl, aSizeEl, aBoldEl, anItalicEl, aShadowEl, anRGBEl[0], anRGBEl[1], anRGBEl[2] );
   myBallActor->SetVisibility(false);
   myBallActor->SetProperty(myBallProp);
   myBallActor->SetRepresentation(SMESH_DeviceActor::eSurface);
   aFilter = myBallActor->GetExtractUnstructuredGrid();
   aFilter->SetModeOfChanging(VTKViewer_ExtractUnstructuredGrid::eAdding);
   aFilter->RegisterCellsWithType(VTK_POLY_VERTEX);
-  
+
   //my0DExtProp = vtkProperty::New();
   //my0DExtProp->DeepCopy(my0DProp);
   //anRGB[0] = 1 - anRGB[0];
@@ -434,12 +433,12 @@ SMESH_ActorDef::SMESH_ActorDef()
   myNodeActor->SetStoreClippingMapping(true);
   myNodeActor->PickableOff();
   myNodeActor->SetVisibility(false);
-  myNodeActor->SetFontProperties( aFamilyNd, aSizeNd, aBoldNd, anItalicNd, aShadowNd, anRGBNd[0], anRGBNd[1], anRGBNd[2] );  
+  myNodeActor->SetFontProperties( aFamilyNd, aSizeNd, aBoldNd, anItalicNd, aShadowNd, anRGBNd[0], anRGBNd[1], anRGBNd[2] );
   myNodeActor->SetProperty(myNodeProp);
   myNodeActor->SetRepresentation(SMESH_DeviceActor::ePoint);
   aFilter = myNodeActor->GetExtractUnstructuredGrid();
   aFilter->SetModeOfExtraction(VTKViewer_ExtractUnstructuredGrid::ePoints);
-  
+
   myNodeExtProp = vtkProperty::New();
   myNodeExtProp->DeepCopy(myNodeProp);
   anRGB[0] = 1 - anRGB[0];
@@ -466,7 +465,7 @@ SMESH_ActorDef::SMESH_ActorDef()
   myBaseActor->SetStoreGemetryMapping(true);
   myBaseActor->GetProperty()->SetOpacity(0.0);
   myPickableActor = myBaseActor;
-  
+
   myHighlightProp = vtkProperty::New();
   myHighlightProp->SetAmbient(1.0);
   myHighlightProp->SetDiffuse(0.0);
@@ -480,7 +479,7 @@ SMESH_ActorDef::SMESH_ActorDef()
   myBallHighlightProp = vtkProperty::New();
   myBallHighlightProp->DeepCopy(myHighlightProp);
   myBallHighlightProp->SetPointSize(aBallElemSize);
-  
+
 
   myOutLineProp = vtkProperty::New();
   myOutLineProp->SetAmbient(1.0);
@@ -522,7 +521,7 @@ SMESH_ActorDef::SMESH_ActorDef()
   //Definition of myScalarBarActor
   //------------------------------
   myLookupTable = vtkLookupTable::New();
-  //Fix for Bug PAL5195 - SMESH764: 
+  //Fix for Bug PAL5195 - SMESH764:
   //Controls - Aspect Ratio: incorrect colors of the best and worst values
   myLookupTable->SetHueRange(0.667,0.0);
 
@@ -541,11 +540,11 @@ SMESH_ActorDef::SMESH_ActorDef()
 
   myEntityMode = eAllEntity;
   myEntityModeCache = eAllEntity;
-  
+
   // Clipping planes
   myImplicitBoolean = vtkImplicitBoolean::New();
   myImplicitBoolean->SetOperationTypeToIntersection();
-  
+
   //Quadratic 2D elements representation
   //-----------------------------------------------------------------------------
   int aQuadratic2DMode = mgr->integerValue( "SMESH", "quadratic_mode", 0);
@@ -559,11 +558,11 @@ SMESH_ActorDef::SMESH_ActorDef()
     my2DActor->SetQuadraticArcMode(true);
     my1DActor->SetQuadraticArcMode(true);
   }
-  
+
   int aQuadraticAngle = mgr->integerValue( "SMESH", "max_angle", 2);
   myHighlitableActor->SetQuadraticArcAngle(aQuadraticAngle);
   my2DActor->SetQuadraticArcAngle(aQuadraticAngle);
-  
+
   // Set colors of the name actor
   SMESH::GetColor( "SMESH", "default_grp_color", anRGB[0], anRGB[1], anRGB[2], QColor( 0, 170, 255 ) );
   myNameActor->SetBackgroundColor(anRGB[0], anRGB[1], anRGB[2]);
@@ -619,8 +618,8 @@ SMESH_ActorDef::~SMESH_ActorDef()
   // myControlActor->Delete(); myControlActor == my2DActor
 
   myNodeExtProp->Delete();
-  myNodeExtActor->Delete();  
- 
+  myNodeExtActor->Delete();
+
   my1DProp->Delete();
   my1DActor->Delete();
   my1DExtProp->Delete();
@@ -632,8 +631,8 @@ SMESH_ActorDef::~SMESH_ActorDef()
   myBallActor->Delete();
   //my0DExtProp->Delete();
   //my0DExtActor->Delete();
- 
-  myImplicitBoolean->Delete();         
+
+  myImplicitBoolean->Delete();
 
 #ifndef DISABLE_PLOT2DVIEWER
   if(my2dHistogram) {
@@ -656,7 +655,7 @@ void SMESH_ActorDef::Delete()
 }
 
 void SMESH_ActorDef::SetPointsLabeled( bool theIsPointsLabeled )
-{    
+{
   if(myNodeActor) {
     myNodeActor->SetPointsLabeled(theIsPointsLabeled);
     SetRepresentation(GetRepresentation());
@@ -667,7 +666,7 @@ void SMESH_ActorDef::SetPointsLabeled( bool theIsPointsLabeled )
 void SMESH_ActorDef::SetPointsFontProperties( SMESH::LabelFont theFamily, int theSize,
                                               bool theBold, bool theItalic, bool theShadow,
                                               vtkFloatingPointType r, vtkFloatingPointType g, vtkFloatingPointType b )
-{    
+{
   if(myNodeActor) {
     myNodeActor->SetFontProperties( theFamily, theSize, theBold, theItalic, theShadow, r, g, b );
     SetRepresentation( GetRepresentation() );
@@ -678,7 +677,7 @@ void SMESH_ActorDef::SetPointsFontProperties( SMESH::LabelFont theFamily, int th
 void SMESH_ActorDef::SetCellsFontProperties( SMESH::LabelFont theFamily, int theSize,
                                              bool theBold, bool theItalic, bool theShadow,
                                              vtkFloatingPointType r, vtkFloatingPointType g, vtkFloatingPointType b )
-{    
+{
   if(my3DActor) {
     my3DActor->SetFontProperties( theFamily, theSize, theBold, theItalic, theShadow, r, g, b );
     SetRepresentation( GetRepresentation() );
@@ -723,10 +722,10 @@ void SMESH_ActorDef::SetCellsLabeled(bool theIsCellsLabeled)
 
   if(my0DActor)
     my0DActor->SetCellsLabeled(theIsCellsLabeled);
-  
+
   if(myBallActor)
     myBallActor->SetCellsLabeled(theIsCellsLabeled);
-  
+
   myTimeStamp->Modified();
 }
 
@@ -801,7 +800,7 @@ bool SMESH_ActorDef::GetFacesOrientation3DVectors()
 }
 
 
-void 
+void
 SMESH_ActorDef::
 SetControlMode(eControl theMode)
 {
@@ -809,12 +808,16 @@ SetControlMode(eControl theMode)
 }
 
 
-void 
+void
 SMESH_ActorDef::
 SetControlMode(eControl theMode,
                bool theCheckEntityMode)
 {
-  SUIT_ResourceMgr* mgr = SUIT_Session::session()->resourceMgr();  
+  vtkLookupTable* lookupTable = static_cast<vtkLookupTable*>(myScalarBarActor->GetLookupTable());
+  bool isLogarithmic = lookupTable->GetScale() == VTK_SCALE_LOG10;
+  lookupTable->SetScale(VTK_SCALE_LINEAR);
+
+  SUIT_ResourceMgr* mgr = SUIT_Session::session()->resourceMgr();
   if( !mgr )
     return;
 
@@ -1036,7 +1039,7 @@ SetControlMode(eControl theMode,
         if (!myIsEntityModeCache){
           myEntityModeCache = GetEntityMode();
           myIsEntityModeCache=true;
-        } 
+        }
         SetEntityMode(eEdges);
       }
       else if(myControlActor == my2DActor) {
@@ -1048,7 +1051,7 @@ SetControlMode(eControl theMode,
           if (!myIsEntityModeCache){
             myEntityModeCache = GetEntityMode();
             myIsEntityModeCache=true;
-          } 
+          }
           SetEntityMode(eFaces);
           break;
         default:
@@ -1062,7 +1065,7 @@ SetControlMode(eControl theMode,
         if (!myIsEntityModeCache){
             myEntityModeCache = GetEntityMode();
             myIsEntityModeCache=true;
-        } 
+        }
         SetEntityMode(eVolumes);
     }
     }
@@ -1080,15 +1083,22 @@ SetControlMode(eControl theMode,
 
   myTimeStamp->Modified();
   Modified();
+
+  lookupTable = static_cast<vtkLookupTable*>(myScalarBarActor->GetLookupTable());
+  double * range = lookupTable->GetRange();
+
+  if (isLogarithmic && range[0] > 1e-07 && range[1] > 1e-07)
+    lookupTable->SetScale(VTK_SCALE_LOG10);
+
   Update();
 }
 
 
 void SMESH_ActorDef::AddToRender(vtkRenderer* theRenderer){
-  
+
   //myHighlightActor->AddToRender(theRenderer);
 
-  theRenderer->AddActor(myBaseActor);  
+  theRenderer->AddActor(myBaseActor);
   theRenderer->AddActor(myNodeExtActor);
   theRenderer->AddActor(my1DExtActor);
 
@@ -1103,7 +1113,7 @@ void SMESH_ActorDef::AddToRender(vtkRenderer* theRenderer){
   //theRenderer->AddActor(my0DExtActor);
 
   theRenderer->AddActor(myHighlitableActor);
-  
+
   theRenderer->AddActor2D(myScalarBarActor);
 
   // the superclass' method should be called at the end
@@ -1137,8 +1147,8 @@ void SMESH_ActorDef::RemoveFromRender(vtkRenderer* theRenderer){
 }
 
 
-bool SMESH_ActorDef::Init(TVisualObjPtr theVisualObj, 
-                          const char* theEntry, 
+bool SMESH_ActorDef::Init(TVisualObjPtr theVisualObj,
+                          const char* theEntry,
                           const char* theName,
                           int theIsClear)
 {
@@ -1155,23 +1165,23 @@ bool SMESH_ActorDef::Init(TVisualObjPtr theVisualObj,
   myHighlitableActor->Init(myVisualObj,myImplicitBoolean);
 
   myNodeExtActor->Init(myVisualObj,myImplicitBoolean);
-  
+
   my0DActor->Init(myVisualObj,myImplicitBoolean);
   myBallActor->Init(myVisualObj,myImplicitBoolean);
   //my0DExtActor->Init(myVisualObj,myImplicitBoolean);
-  
+
   my1DActor->Init(myVisualObj,myImplicitBoolean);
   my1DExtActor->Init(myVisualObj,myImplicitBoolean);
-  
+
   my2DActor->Init(myVisualObj,myImplicitBoolean);
   my2DExtActor->Init(myVisualObj,myImplicitBoolean);
   my3DActor->Init(myVisualObj,myImplicitBoolean);
   my3DExtActor->Init(myVisualObj,myImplicitBoolean);
-  
+
   my0DActor->GetMapper()->SetLookupTable(myLookupTable);
   myBallActor->GetMapper()->SetLookupTable(myLookupTable);
   //my0DExtActor->GetMapper()->SetLookupTable(myLookupTable);
-  
+
   my1DActor->GetMapper()->SetLookupTable(myLookupTable);
   my1DExtActor->GetMapper()->SetLookupTable(myLookupTable);
 
@@ -1179,7 +1189,7 @@ bool SMESH_ActorDef::Init(TVisualObjPtr theVisualObj,
   my2DExtActor->GetMapper()->SetLookupTable(myLookupTable);
   my3DActor->GetMapper()->SetLookupTable(myLookupTable);
   my3DExtActor->GetMapper()->SetLookupTable(myLookupTable);
-    
+
   vtkFloatingPointType aFactor, aUnits;
   my2DActor->GetPolygonOffsetParameters(aFactor,aUnits);
   my2DActor->SetPolygonOffsetParameters(aFactor,aUnits*0.75);
@@ -1197,7 +1207,7 @@ bool SMESH_ActorDef::Init(TVisualObjPtr theVisualObj,
 
   int aMode = mgr->integerValue( "SMESH", "display_mode" );
   SetRepresentation(-1);
-  
+
   if(aMode == 0){
     SetRepresentation(eEdge);
   }else if(aMode == 1){
@@ -1205,7 +1215,7 @@ bool SMESH_ActorDef::Init(TVisualObjPtr theVisualObj,
   }else if(aMode == 2){
     SetRepresentation(ePoint);
   }
-  
+
   if(aMode == 3){
     SetShrink();
   }
@@ -1238,7 +1248,7 @@ void SMESH_ActorDef::SetTransform(VTKViewer_Transform* theTransform){
 
   myNodeActor->SetTransform(theTransform);
   myBaseActor->SetTransform(theTransform);
-  
+
   myHighlitableActor->SetTransform(theTransform);
 
   myNodeExtActor->SetTransform(theTransform);
@@ -1274,7 +1284,7 @@ vtkMapper* SMESH_ActorDef::GetMapper(){
 }
 
 
-vtkUnstructuredGrid* SMESH_ActorDef::GetUnstructuredGrid(){ 
+vtkUnstructuredGrid* SMESH_ActorDef::GetUnstructuredGrid(){
   return myVisualObj->GetUnstructuredGrid();
 }
 
@@ -1283,7 +1293,7 @@ bool SMESH_ActorDef::IsInfinitive(){
   vtkDataSet *aDataSet = myPickableActor->GetUnstructuredGrid();
   aDataSet->Update();
   myIsInfinite = aDataSet->GetNumberOfCells() == 0 ||
-    ( aDataSet->GetNumberOfCells() == 1 && 
+    ( aDataSet->GetNumberOfCells() == 1 &&
     aDataSet->GetCell(0)->GetCellType() == VTK_VERTEX );
   return SALOME_Actor::IsInfinitive();
 }
@@ -1381,7 +1391,7 @@ void SMESH_ActorDef::SetVisibility(int theMode, bool theIsUpdateRepersentation){
 
   myNodeActor->VisibilityOff();
   myBaseActor->VisibilityOff();
-  
+
   myNodeExtActor->VisibilityOff();
 
   my0DActor->VisibilityOff();
@@ -1390,18 +1400,18 @@ void SMESH_ActorDef::SetVisibility(int theMode, bool theIsUpdateRepersentation){
 
   my1DActor->VisibilityOff();
   my1DExtActor->VisibilityOff();
-  
+
   my2DActor->VisibilityOff();
   my2DExtActor->VisibilityOff();
   my3DActor->VisibilityOff();
   my3DExtActor->VisibilityOff();
-  
+
   myScalarBarActor->VisibilityOff();
-  
+
   if(GetVisibility()){
     if(theIsUpdateRepersentation)
       SetRepresentation(GetRepresentation());
-    
+
     if(myControlMode != eNone){
       switch(myControlMode){
       case eFreeNodes:
@@ -1449,34 +1459,34 @@ void SMESH_ActorDef::SetVisibility(int theMode, bool theIsUpdateRepersentation){
     if(myEntityMode & eEdges && GetRepresentation() != ePoint){
       my1DActor->VisibilityOn();
     }
-    
+
     if(myEntityMode & eFaces && GetRepresentation() != ePoint){
       my2DActor->VisibilityOn();
     }
-    
+
     if(myEntityMode & eVolumes && GetRepresentation() != ePoint){
       my3DActor->VisibilityOn();
     }
-    
-    if(myNodeActor->GetPointsLabeled()){ 
+
+    if(myNodeActor->GetPointsLabeled()){
       myNodeActor->VisibilityOn();
     }
 
     if(my0DActor)
       my0DActor->UpdateLabels();
-    
+
     if(myBallActor)
       myBallActor->UpdateLabels();
-    
+
     if(my1DActor)
       my1DActor->UpdateLabels();
-    
+
     if(my2DActor)
       my2DActor->UpdateLabels();
-    
+
     if(my3DActor)
-      my3DActor->UpdateLabels();    
-  } 
+      my3DActor->UpdateLabels();
+  }
 #ifndef DISABLE_PLOT2DVIEWER
   else
     SMESH::ProcessIn2DViewers(this,SMESH::RemoveFrom2dViewer);
@@ -1597,7 +1607,7 @@ void SMESH_ActorDef::SetEntityMode(unsigned int theMode)
 //#ifdef VTK_HAVE_POLYHEDRON
     aFilter->RegisterCellsWithType(VTK_POLYHEDRON);
 //#endif
-    
+
     aHightFilter->RegisterCellsWithType(VTK_TETRA);
     aHightFilter->RegisterCellsWithType(VTK_VOXEL);
     aHightFilter->RegisterCellsWithType(VTK_HEXAHEDRON);
@@ -1620,7 +1630,7 @@ void SMESH_ActorDef::SetEntityMode(unsigned int theMode)
 }
 
 void SMESH_ActorDef::SetRepresentation (int theMode)
-{ 
+{
   int aNbEdges = myVisualObj->GetNbEntities(SMDSAbs_Edge);
   int aNbFaces = myVisualObj->GetNbEntities(SMDSAbs_Face);
   int aNbVolumes = myVisualObj->GetNbEntities(SMDSAbs_Volume);
@@ -1642,7 +1652,7 @@ void SMESH_ActorDef::SetRepresentation (int theMode)
     case eSurface:
       if (!aNbFaces && !aNbVolumes && !aNb0Ds && !aNbBalls) return;
       break;
-    }    
+    }
     myRepresentation = theMode;
   }
 
@@ -1655,7 +1665,7 @@ void SMESH_ActorDef::SetRepresentation (int theMode)
       myIsShrunk = true;
     } else {
       SetShrink();
-    }      
+    }
   }
 
   myPickableActor = myBaseActor;
@@ -1696,7 +1706,7 @@ void SMESH_ActorDef::SetRepresentation (int theMode)
     my2DActor->SetQuadraticArcMode(true);
 
   my2DExtActor->SetRepresentation(aReperesent);
-  
+
   my3DActor->SetProperty(aPropVN);
   my3DActor->SetBackfaceProperty(aPropVR);
   my3DActor->SetRepresentation(aReperesent);
@@ -1721,7 +1731,7 @@ void SMESH_ActorDef::SetRepresentation (int theMode)
       aReperesent = SMESH_DeviceActor::eInsideframe;
     break;
   }
-  
+
   if(aQuadraticMode == SMESH_Actor::eLines)
     my1DActor->SetQuadraticArcMode(false);
   else if(aQuadraticMode == SMESH_Actor::eArcs)
@@ -1753,7 +1763,7 @@ void SMESH_ActorDef::SetPointRepresentation(bool theIsPointsVisible){
   SetRepresentation(GetRepresentation());
 }
 
-bool SMESH_ActorDef::GetPointRepresentation(){ 
+bool SMESH_ActorDef::GetPointRepresentation(){
   return myIsPointsVisible || myNodeActor->GetPointsLabeled();
 }
 
@@ -1776,7 +1786,7 @@ void SMESH_ActorDef::UpdateHighlight(){
         myBallActor->SetProperty(myBallPreselectProp);
       } else if(anIsVisible){
         myBallActor->SetProperty(myBallProp);
-        (myRepresentation == eSurface) ? 
+        (myRepresentation == eSurface) ?
           myHighlitableActor->SetProperty(myOutLineProp) : myHighlitableActor->SetProperty(myEdgeProp);
       }
       if(GetUnstructuredGrid()->GetNumberOfCells()) {
@@ -1813,10 +1823,10 @@ void SMESH_ActorDef::highlight(bool theHighlight){
 }
 
 
-void SMESH_ActorDef::SetPreSelected(bool thePreselect){ 
+void SMESH_ActorDef::SetPreSelected(bool thePreselect){
   if ( myIsPreselected == thePreselect )
     return;
-  myIsPreselected = thePreselect; 
+  myIsPreselected = thePreselect;
   UpdateHighlight();
 }
 
@@ -1870,30 +1880,30 @@ void SMESH_ActorDef::Update(){
 
   if(my0DActor)
     my0DActor->UpdateLabels();
-  
+
   if(myBallActor)
     myBallActor->UpdateLabels();
-  
+
   if(my1DActor)
     my1DActor->UpdateLabels();
-  
+
   if(my2DActor)
     my2DActor->UpdateLabels();
 
   if(my3DActor)
     my3DActor->UpdateLabels();
-  
+
   if(myIsFacesOriented){
     SetFacesOriented(myIsFacesOriented);
   }
-    
+
   if(myVisualObj->GetEntitiesFlag()) {
     myEntityMode |= myVisualObj->GetEntitiesState();
   }
-  
+
   SetEntityMode(GetEntityMode());
   SetVisibility(GetVisibility());
-  
+
   myTimeStamp->Modified();
   Modified();
 }
@@ -1940,7 +1950,7 @@ void SMESH_ActorDef::SetSufaceColor(vtkFloatingPointType r,vtkFloatingPointType
   if( SMESH_GroupObj* aGroupObj = dynamic_cast<SMESH_GroupObj*>( myVisualObj.get() ) )
     if( aGroupObj->GetElementType() == SMDSAbs_Face )
       myNameActor->SetBackgroundColor(r,g,b);
-  
+
   myDeltaBrightness = delta;
   QColor bfc = Qtx::mainColorToSecondary(QColor(int(r*255),int(g*255),int(b*255)), delta);
   myBackSurfaceProp->SetColor( bfc.red() / 255. , bfc.green() / 255. , bfc.blue() / 255. );
@@ -1958,7 +1968,7 @@ void SMESH_ActorDef::SetVolumeColor(vtkFloatingPointType r,vtkFloatingPointType
   if( SMESH_GroupObj* aGroupObj = dynamic_cast<SMESH_GroupObj*>( myVisualObj.get() ) )
     if( aGroupObj->GetElementType() == SMDSAbs_Volume )
       myNameActor->SetBackgroundColor(r,g,b);
-  
+
   myDeltaVBrightness = delta;
   QColor bfc = Qtx::mainColorToSecondary(QColor(int(r*255),int(g*255),int(b*255)), delta);
   myReversedVProp->SetColor( bfc.red() / 255. , bfc.green() / 255. , bfc.blue() / 255. );
@@ -1994,7 +2004,7 @@ void SMESH_ActorDef::GetOutlineColor(vtkFloatingPointType& r,vtkFloatingPointTyp
 }
 
 
-void SMESH_ActorDef::SetNodeColor(vtkFloatingPointType r,vtkFloatingPointType g,vtkFloatingPointType b){ 
+void SMESH_ActorDef::SetNodeColor(vtkFloatingPointType r,vtkFloatingPointType g,vtkFloatingPointType b){
   myNodeProp->SetColor(r,g,b);
   myNodeExtProp->SetColor(1.0-r,1.0-g,1.0-b);
   if( SMESH_GroupObj* aGroupObj = dynamic_cast<SMESH_GroupObj*>( myVisualObj.get() ) )
@@ -2003,11 +2013,11 @@ void SMESH_ActorDef::SetNodeColor(vtkFloatingPointType r,vtkFloatingPointType g,
   Modified();
 }
 
-void SMESH_ActorDef::GetNodeColor(vtkFloatingPointType& r,vtkFloatingPointType& g,vtkFloatingPointType& b){ 
+void SMESH_ActorDef::GetNodeColor(vtkFloatingPointType& r,vtkFloatingPointType& g,vtkFloatingPointType& b){
   ::GetColor(myNodeProp,r,g,b);
 }
 
-void SMESH_ActorDef::Set0DColor(vtkFloatingPointType r,vtkFloatingPointType g,vtkFloatingPointType b){ 
+void SMESH_ActorDef::Set0DColor(vtkFloatingPointType r,vtkFloatingPointType g,vtkFloatingPointType b){
   my0DProp->SetColor(r,g,b);
   if( SMESH_GroupObj* aGroupObj = dynamic_cast<SMESH_GroupObj*>( myVisualObj.get() ) )
     if( aGroupObj->GetElementType() == SMDSAbs_0DElement )
@@ -2015,11 +2025,11 @@ void SMESH_ActorDef::Set0DColor(vtkFloatingPointType r,vtkFloatingPointType g,vt
   Modified();
 }
 
-void SMESH_ActorDef::Get0DColor(vtkFloatingPointType& r,vtkFloatingPointType& g,vtkFloatingPointType& b){ 
+void SMESH_ActorDef::Get0DColor(vtkFloatingPointType& r,vtkFloatingPointType& g,vtkFloatingPointType& b){
   ::GetColor(my0DProp,r,g,b);
 }
 
-void SMESH_ActorDef::SetBallColor(vtkFloatingPointType r,vtkFloatingPointType g,vtkFloatingPointType b){ 
+void SMESH_ActorDef::SetBallColor(vtkFloatingPointType r,vtkFloatingPointType g,vtkFloatingPointType b){
   myBallProp->SetColor(r,g,b);
   if( SMESH_GroupObj* aGroupObj = dynamic_cast<SMESH_GroupObj*>( myVisualObj.get() ) )
     if( aGroupObj->GetElementType() == SMDSAbs_Ball )
@@ -2027,27 +2037,27 @@ void SMESH_ActorDef::SetBallColor(vtkFloatingPointType r,vtkFloatingPointType g,
   Modified();
 }
 
-void SMESH_ActorDef::GetBallColor(vtkFloatingPointType& r,vtkFloatingPointType& g,vtkFloatingPointType& b){ 
+void SMESH_ActorDef::GetBallColor(vtkFloatingPointType& r,vtkFloatingPointType& g,vtkFloatingPointType& b){
   ::GetColor(myBallProp,r,g,b);
 }
 
-void SMESH_ActorDef::SetHighlightColor(vtkFloatingPointType r,vtkFloatingPointType g,vtkFloatingPointType b){ 
+void SMESH_ActorDef::SetHighlightColor(vtkFloatingPointType r,vtkFloatingPointType g,vtkFloatingPointType b){
   myHighlightProp->SetColor(r,g,b);
   myBallHighlightProp->SetColor(r,g,b);
   Modified();
 }
 
-void SMESH_ActorDef::GetHighlightColor(vtkFloatingPointType& r,vtkFloatingPointType& g,vtkFloatingPointType& b){ 
+void SMESH_ActorDef::GetHighlightColor(vtkFloatingPointType& r,vtkFloatingPointType& g,vtkFloatingPointType& b){
   ::GetColor(myHighlightProp,r,g,b);
 }
 
-void SMESH_ActorDef::SetPreHighlightColor(vtkFloatingPointType r,vtkFloatingPointType g,vtkFloatingPointType b){ 
+void SMESH_ActorDef::SetPreHighlightColor(vtkFloatingPointType r,vtkFloatingPointType g,vtkFloatingPointType b){
   myPreselectProp->SetColor(r,g,b);
   myBallPreselectProp->SetColor(r,g,b);
   Modified();
 }
 
-void SMESH_ActorDef::GetPreHighlightColor(vtkFloatingPointType& r,vtkFloatingPointType& g,vtkFloatingPointType& b){ 
+void SMESH_ActorDef::GetPreHighlightColor(vtkFloatingPointType& r,vtkFloatingPointType& g,vtkFloatingPointType& b){
   ::GetColor(myPreselectProp,r,g,b);
 }
 
@@ -2061,7 +2071,7 @@ void SMESH_ActorDef::SetLineWidth(vtkFloatingPointType theVal){
   myEdgeProp->SetLineWidth(theVal);
 
   my1DProp->SetLineWidth(theVal + aLineWidthInc);
-  my1DExtProp->SetLineWidth(theVal + aLineWidthInc);    
+  my1DExtProp->SetLineWidth(theVal + aLineWidthInc);
   my2DExtProp->SetLineWidth(theVal + aLineWidthInc);
   my3DExtProp->SetLineWidth(theVal + aLineWidthInc);
   myOutLineProp->SetLineWidth(theVal);
@@ -2153,7 +2163,7 @@ SMESH_ActorDef::SetImplicitFunctionUsed(bool theIsImplicitFunctionUsed)
   my3DExtActor->SetImplicitFunctionUsed(theIsImplicitFunctionUsed);
 }
 
-vtkIdType 
+vtkIdType
 SMESH_ActorDef::AddClippingPlane(vtkPlane* thePlane)
 {
   if(thePlane){
@@ -2184,7 +2194,7 @@ GetNumberOfClippingPlanes()
   return myCippingPlaneCont.size();
 }
 
-vtkPlane* 
+vtkPlane*
 SMESH_ActorDef::
 GetClippingPlane(vtkIdType theID)
 {
@@ -2312,7 +2322,7 @@ void SMESH_ActorDef::UpdateScalarBar()
 
   int coloringType = mgr->integerValue("SMESH", "distribution_coloring_type", 0);
   myScalarBarActor->SetDistributionColoringType(coloringType);
-  
+
   QColor distributionColor = mgr->colorValue("SMESH", "distribution_color",
                                              QColor(255, 255, 255));
   double rgb[3];
@@ -2321,7 +2331,7 @@ void SMESH_ActorDef::UpdateScalarBar()
   rgb[2]= distributionColor.blue()/255.;
   myScalarBarActor->SetDistributionColor(rgb);
 
-  
+
 }
 
 void SMESH_ActorDef::UpdateDistribution()
@@ -2340,7 +2350,8 @@ void SMESH_ActorDef::UpdateDistribution()
       elemIds.push_back( (*e)->GetID());
     vtkLookupTable* lookupTable = static_cast<vtkLookupTable*>(myScalarBarActor->GetLookupTable());
     double * range = lookupTable->GetRange();
-    fun->GetHistogram(nbIntervals, nbEvents, funValues, elemIds, range);
+    bool isLogarithmic = lookupTable->GetScale() == VTK_SCALE_LOG10;
+    fun->GetHistogram(nbIntervals, nbEvents, funValues, elemIds, range, isLogarithmic);
     myScalarBarActor->SetDistribution(nbEvents);
   }
 }
@@ -2394,17 +2405,17 @@ SPlot2d_Histogram* SMESH_ActorDef::UpdatePlot2Histogram() {
 
   if(my2dHistogram)
     my2dHistogram->clearAllPoints();
-  
+
   if(SMESH::Controls::NumericalFunctor* fun =
      dynamic_cast<SMESH::Controls::NumericalFunctor*>(myFunctor.get()))
   {
-    
+
     if(!my2dHistogram) {
       my2dHistogram = new SPlot2d_Histogram();
       Handle(SALOME_InteractiveObject) anIO = new SALOME_InteractiveObject(getIO()->getEntry(),"SMESH",getName());
       my2dHistogram->setIO(anIO);
     }
-    
+
     int nbIntervals = myScalarBarActor->GetMaximumNumberOfColors();
     std::vector<int> nbEvents;
     std::vector<double> funValues;
@@ -2412,22 +2423,23 @@ SPlot2d_Histogram* SMESH_ActorDef::UpdatePlot2Histogram() {
     if ( ! dynamic_cast<SMESH_MeshObj*>(myVisualObj.get()))
       dynamic_cast<SMESH_VisualObjDef*>(myVisualObj.get())->GetEntities( fun->GetType(), elems );
     std::vector<int> elemIds;
-    
+
     for ( SMESH_VisualObjDef::TEntityList::iterator e = elems.begin(); e != elems.end(); ++e)
       elemIds.push_back( (*e)->GetID());
 
     vtkLookupTable* lookupTable = static_cast<vtkLookupTable*>(myScalarBarActor->GetLookupTable());
     double * range = lookupTable->GetRange();
-    fun->GetHistogram(nbIntervals, nbEvents, funValues, elemIds, range);
+    bool isLogarithmic = lookupTable->GetScale() == VTK_SCALE_LOG10;
+    fun->GetHistogram(nbIntervals, nbEvents, funValues, elemIds, range, isLogarithmic);
 
-    for ( int i = 0; i < std::min( nbEvents.size(), funValues.size() -1 ); i++ ) 
+    for ( int i = 0; i < std::min( nbEvents.size(), funValues.size() -1 ); i++ )
       my2dHistogram->addPoint(funValues[i] + (funValues[i+1] - funValues[i])/2.0, static_cast<double>(nbEvents[i]));
 
     if(funValues.size() >= 2)
       my2dHistogram->setWidth((funValues[1] - funValues[0]) * 0.8) ;
 
   }
-  
+
   //Color of the histogram
   if(myScalarBarActor->GetDistributionColoringType() == SMESH_MULTICOLOR_TYPE)
     my2dHistogram->setAutoAssign(true);
@@ -2438,7 +2450,7 @@ SPlot2d_Histogram* SMESH_ActorDef::UpdatePlot2Histogram() {
     my2dHistogram->setColor(aColor);
 
   }
-      
+
   return my2dHistogram;
 }
 #endif
diff --git a/src/SMESHGUI/SMESHGUI.cxx b/src/SMESHGUI/SMESHGUI.cxx
index b509f6ac1..5c87d1c2c 100644
--- a/src/SMESHGUI/SMESHGUI.cxx
+++ b/src/SMESHGUI/SMESHGUI.cxx
@@ -1108,9 +1108,10 @@
               vtkLookupTable* lookupTable =
                 static_cast<vtkLookupTable*>(aScalarBarActor->GetLookupTable());
               double * minmax = lookupTable->GetRange();
+              bool isLogarithmic = lookupTable->GetScale() == VTK_SCALE_LOG10;
               std::vector<int>    nbEvents;
               std::vector<double> funValues;
-              aNumFun->GetHistogram( nbIntervals, nbEvents, funValues, elements, minmax );
+              aNumFun->GetHistogram( nbIntervals, nbEvents, funValues, elements, minmax, isLogarithmic );
               QString anInitialPath = "";
               if ( SUIT_FileDlg::getLastVisitedPath().isEmpty() )
                 anInitialPath = QDir::currentPath();
@@ -1603,7 +1604,7 @@
             aControl = SMESH_Actor::eCoincidentElems3D;
             break;
           }
-            
+
           anActor->SetControlMode(aControl);
           anActor->GetScalarBarActor()->SetTitle( functorToString( anActor->GetFunctor() ).toLatin1().constData() );
           SMESH::RepaintCurrentView();
diff --git a/src/SMESHGUI/SMESHGUI_Preferences_ScalarBarDlg.cxx b/src/SMESHGUI/SMESHGUI_Preferences_ScalarBarDlg.cxx
index 7f0a861ae..4e3f3d5b5 100644
--- a/src/SMESHGUI/SMESHGUI_Preferences_ScalarBarDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_Preferences_ScalarBarDlg.cxx
@@ -18,13 +18,12 @@
 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 //
 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
-//
 
 // SMESH SMESHGUI : GUI for SMESH component
 // File   : SMESHGUI_Preferences_ScalarBarDlg.cxx
 // Author : Nicolas REJNERI, Open CASCADE S.A.S.
 // SMESH includes
-//
+
 #include "SMESHGUI_Preferences_ScalarBarDlg.h"
 
 #include "SMESHGUI.h"
@@ -130,22 +129,28 @@ SMESHGUI_Preferences_ScalarBarDlg::SMESHGUI_Preferences_ScalarBarDlg( SMESHGUI*
   /******************************************************************************/
   // Scalar range
   myRangeGrp = new QGroupBox ( tr( "SMESH_RANGE_SCALARBAR" ), this );
-  QHBoxLayout* myRangeGrpLayout = new QHBoxLayout( myRangeGrp );
+  //QHBoxLayout* myRangeGrpLayout = new QHBoxLayout( myRangeGrp );
+  QGridLayout* myRangeGrpLayout = new QGridLayout( myRangeGrp );
   myRangeGrpLayout->setSpacing( SPACING_SIZE ); myRangeGrpLayout->setMargin( MARGIN_SIZE );
-  
+
   myMinEdit = new QLineEdit( myRangeGrp );
   myMinEdit->setMinimumWidth( MINIMUM_WIDTH );
   myMinEdit->setValidator( new QDoubleValidator( this ) );
-  
+
   myMaxEdit = new QLineEdit( myRangeGrp );
   myMaxEdit->setMinimumWidth( MINIMUM_WIDTH );
   myMaxEdit->setValidator( new QDoubleValidator( this ) );
-  
-  myRangeGrpLayout->addWidget( new QLabel( tr( "SMESH_RANGE_MIN" ), myRangeGrp ) );
-  myRangeGrpLayout->addWidget( myMinEdit );
-  myRangeGrpLayout->addWidget( new QLabel( tr( "SMESH_RANGE_MAX" ), myRangeGrp ) );
-  myRangeGrpLayout->addWidget( myMaxEdit );
-  
+
+  myLogarithmicCheck = new QCheckBox (myRangeGrp);
+  myLogarithmicCheck->setText(tr("SMESH_LOGARITHMIC_SCALARBAR"));
+  myLogarithmicCheck->setChecked(false);
+
+  myRangeGrpLayout->addWidget( new QLabel( tr( "SMESH_RANGE_MIN" ), myRangeGrp ), 0, 0, 1, 1 );
+  myRangeGrpLayout->addWidget( myMinEdit, 0, 1, 1, 1 );
+  myRangeGrpLayout->addWidget( new QLabel( tr( "SMESH_RANGE_MAX" ), myRangeGrp ), 0, 2, 1, 1 );
+  myRangeGrpLayout->addWidget( myMaxEdit, 0, 3, 1, 1 );
+  myRangeGrpLayout->addWidget( myLogarithmicCheck, 1, 0, 1, 4 );
+
   aTopLayout->addWidget( myRangeGrp );
 
   /******************************************************************************/
@@ -255,19 +260,19 @@ SMESHGUI_Preferences_ScalarBarDlg::SMESHGUI_Preferences_ScalarBarDlg( SMESHGUI*
 
   myYSpin = new SMESHGUI_SpinBox(myOriginDimGrp);
   myYSpin->setAcceptNames( false );
-  myYSpin->RangeStepAndValidator( 0.0, 1.0, 0.1, "parametric_precision" );  
+  myYSpin->RangeStepAndValidator( 0.0, 1.0, 0.1, "parametric_precision" );
   myYSpin->setMinimumWidth( MINIMUM_WIDTH );
   myYSpin->setSizePolicy( QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Fixed ) );
 
   myWidthSpin = new SMESHGUI_SpinBox(myOriginDimGrp);
   myWidthSpin->setAcceptNames( false );
-  myWidthSpin->RangeStepAndValidator( 0.0, 1.0, 0.1, "parametric_precision" );    
+  myWidthSpin->RangeStepAndValidator( 0.0, 1.0, 0.1, "parametric_precision" );
   myWidthSpin->setMinimumWidth( MINIMUM_WIDTH );
   myWidthSpin->setSizePolicy( QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Fixed ) );
 
   myHeightSpin = new SMESHGUI_SpinBox(myOriginDimGrp);
   myHeightSpin->setAcceptNames( false );
-  myHeightSpin->RangeStepAndValidator( 0.0, 1.0, 0.1, "parametric_precision" );    
+  myHeightSpin->RangeStepAndValidator( 0.0, 1.0, 0.1, "parametric_precision" );
   myHeightSpin->setMinimumWidth( MINIMUM_WIDTH );
   myHeightSpin->setSizePolicy( QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Fixed ) );
 
@@ -297,18 +302,18 @@ SMESHGUI_Preferences_ScalarBarDlg::SMESHGUI_Preferences_ScalarBarDlg( SMESHGUI*
 
   myDistribColorGrp->addButton(myDMonoColor);myDistribColorGrp->setId(myDMonoColor,1);
   myDistribColorGrp->addButton(myDMultiColor);myDistribColorGrp->setId(myDMultiColor,2);
-  
+
   aDistributionGrpLayout->addWidget( myDMultiColor );
   aDistributionGrpLayout->addWidget( myDMonoColor );
-  
+
   //Color of the Distribution in monocolor case:
   myDistributionColorLbl = new QLabel( tr( "SMESH_DISTRIBUTION_COLOR" ), myDistributionGrp );
   aDistributionGrpLayout->addWidget( myDistributionColorLbl );
   myMonoColorBtn = new QtxColorButton( myDistributionGrp  );
   aDistributionGrpLayout->addWidget(myMonoColorBtn);
-  
+
   aTopLayout->addWidget(myDistributionGrp);
-  
+
   /******************************************************************************/
   // Common buttons
   myButtonGrp = new QGroupBox( this );
@@ -351,13 +356,13 @@ SMESHGUI_Preferences_ScalarBarDlg::SMESHGUI_Preferences_ScalarBarDlg( SMESHGUI*
       myTitleFontCombo->setCurrentIndex(1);
     if( f.family()=="Times")
       myTitleFontCombo->setCurrentIndex(2);
-    
+
     myTitleBoldCheck->setChecked  ( f.bold() );
     myTitleItalicCheck->setChecked( f.italic() );
     myTitleShadowCheck->setChecked( f.overline() );
   }
-                                      
-  QColor labelColor = mgr->colorValue("SMESH", "scalar_bar_label_color", 
+
+  QColor labelColor = mgr->colorValue("SMESH", "scalar_bar_label_color",
                                       QColor(255, 255, 255));
   myLabelsColorBtn->setColor(labelColor);
   myLabelsFontCombo->setCurrentIndex(0);
@@ -369,7 +374,7 @@ SMESHGUI_Preferences_ScalarBarDlg::SMESHGUI_Preferences_ScalarBarDlg( SMESHGUI*
       myLabelsFontCombo->setCurrentIndex(1);
     if (f.family() == "Times")
       myLabelsFontCombo->setCurrentIndex(2);
-      
+
     myLabelsBoldCheck  ->setChecked( f.bold() );
     myLabelsItalicCheck->setChecked( f.italic() );
     myLabelsShadowCheck->setChecked( f.overline() );
@@ -391,7 +396,7 @@ SMESHGUI_Preferences_ScalarBarDlg::SMESHGUI_Preferences_ScalarBarDlg( SMESHGUI*
 
   QString name = isHoriz ? "scalar_bar_horizontal_%1" : "scalar_bar_vertical_%1";
 
-  myIniX = mgr->doubleValue("SMESH", name.arg( "x" ), 
+  myIniX = mgr->doubleValue("SMESH", name.arg( "x" ),
                             myHorizRadioBtn->isChecked() ? DEF_HOR_X : DEF_VER_X);
 
   myIniY = mgr->doubleValue("SMESH", name.arg( "y" ),
@@ -412,18 +417,16 @@ SMESHGUI_Preferences_ScalarBarDlg::SMESHGUI_Preferences_ScalarBarDlg( SMESHGUI*
   int coloringType = mgr->integerValue("SMESH", "distribution_coloring_type", 0);
   if( coloringType == SMESH_MONOCOLOR_TYPE ) {
     myDMonoColor->setChecked(true);
-    onDistributionChanged(myDistribColorGrp->id(myDMonoColor));    
+    onDistributionChanged(myDistribColorGrp->id(myDMonoColor));
   } else {
     myDMultiColor->setChecked(true);
     onDistributionChanged(myDistribColorGrp->id(myDMultiColor));
 
   }
-  
+
   QColor distributionColor = mgr->colorValue("SMESH", "distribution_color",
                                              QColor(255, 255, 255));
   myMonoColorBtn->setColor(distributionColor);
-  
-  
 
   // --> then init from selection if necessary
   onSelectionChanged();
@@ -434,6 +437,8 @@ SMESHGUI_Preferences_ScalarBarDlg::SMESHGUI_Preferences_ScalarBarDlg( SMESHGUI*
   connect( myApplyBtn,          SIGNAL( clicked() ), this, SLOT( onApply() ) );
   connect( myCancelBtn,         SIGNAL( clicked() ), this, SLOT( onCancel() ) );
   connect( myHelpBtn,           SIGNAL(clicked()),   this, SLOT( onHelp() ) );
+  connect( myMinEdit,           SIGNAL( textChanged(const QString &) ), this, SLOT( onMinMaxChanged() ) );
+  connect( myMaxEdit,           SIGNAL( textChanged(const QString &) ), this, SLOT( onMinMaxChanged() ) );
   connect( myXSpin,             SIGNAL( valueChanged( double ) ), this, SLOT( onXYChanged() ) );
   connect( myYSpin,             SIGNAL( valueChanged( double ) ), this, SLOT( onXYChanged() ) );
   connect( aOrientationGrp,     SIGNAL( buttonClicked( int ) ),   this, SLOT( onOrientationChanged() ) );
@@ -528,9 +533,9 @@ bool SMESHGUI_Preferences_ScalarBarDlg::onApply()
   if( myDistributionGrp->isChecked() ) {
     int ColoringType = myDMultiColor->isChecked() ? SMESH_MULTICOLOR_TYPE : SMESH_MONOCOLOR_TYPE;
     distributionTypeChanged = (ColoringType != myScalarBarActor->GetDistributionColoringType());
-    if(distributionTypeChanged)      
+    if (distributionTypeChanged)
       myScalarBarActor->SetDistributionColoringType(ColoringType);
-    
+
     if( !myDMultiColor->isChecked() ) {
       QColor aTColor = myMonoColorBtn->color();
       double rgb[3], oldRgb[3];;
@@ -551,29 +556,31 @@ bool SMESHGUI_Preferences_ScalarBarDlg::onApply()
   double oldMinMax[2] = { myLookupTable->GetRange()[0], myLookupTable->GetRange()[1] };
   bool rangeChanges = ( fabs( oldMinMax[0] - aMin ) + fabs( oldMinMax[1] - aMax ) >
                         0.001 * ( aMax-aMin + oldMinMax[1]-oldMinMax[0] ));
-  
+
   bool nbColorsChanged = (myColorsSpin->value() != myScalarBarActor->GetMaximumNumberOfColors());
   if(nbColorsChanged)
     myScalarBarActor->SetMaximumNumberOfColors(myColorsSpin->value());
-  
 
   myLookupTable->SetRange( aMin, aMax );
   myLookupTable->SetNumberOfTableValues(myColorsSpin->value());
+
+  bool scaleChanged = (myLogarithmicCheck->isChecked() != (myLookupTable->GetScale() == VTK_SCALE_LOG10));
+  if (scaleChanged)
+    myLookupTable->SetScale(myLogarithmicCheck->isChecked() ? VTK_SCALE_LOG10 : VTK_SCALE_LINEAR);
+
   myLookupTable->Build();
 
-  if( nbColorsChanged || rangeChanges)
+  if (nbColorsChanged || rangeChanges || scaleChanged)
     myActor->UpdateDistribution();
-  
+
 #ifndef DISABLE_PLOT2DVIEWER
-  if( myActor->GetPlot2Histogram() && 
-      (nbColorsChanged || 
+  if( myActor->GetPlot2Histogram() &&
+      (nbColorsChanged ||
        rangeChanges ||
-       distributionTypeChanged || 
+       distributionTypeChanged ||
        colorChanged ))
     SMESH::ProcessIn2DViewers(myActor);
 #endif
-    
-    
 
   SMESH::RepaintCurrentView();
   return true;
@@ -601,7 +608,7 @@ void SMESHGUI_Preferences_ScalarBarDlg::onCancel()
 void SMESHGUI_Preferences_ScalarBarDlg::onHelp()
 {
   LightApp_Application* app = (LightApp_Application*)(SUIT_Session::session()->activeApplication());
-  if (app) 
+  if (app)
     app->onHelpContextModule(mySMESHGUI ? app->moduleName(mySMESHGUI->moduleName()) : QString(""), myHelpFileName);
   else {
     QString platform;
@@ -612,7 +619,7 @@ void SMESHGUI_Preferences_ScalarBarDlg::onHelp()
 #endif
     SUIT_MessageBox::warning(this, tr("WRN_WARNING"),
                              tr("EXTERNAL_BROWSER_CANNOT_SHOW_PAGE").
-                             arg(app->resourceMgr()->stringValue("ExternalBrowser", 
+                             arg(app->resourceMgr()->stringValue("ExternalBrowser",
                                                                  platform)).
                              arg(myHelpFileName));
   }
@@ -639,9 +646,13 @@ void SMESHGUI_Preferences_ScalarBarDlg::onSelectionChanged()
         SMESH_ScalarBarActor* myScalarBarActor = myActor->GetScalarBarActor();
 
         if ( myScalarBarActor->GetLookupTable() ) {
-          vtkFloatingPointType *range = myScalarBarActor->GetLookupTable()->GetRange();
+          vtkLookupTable* aLookupTable = static_cast<vtkLookupTable*>(myScalarBarActor->GetLookupTable());
+
+          vtkFloatingPointType *range = aLookupTable->GetRange();
           myMinEdit->setText( QString::number( range[0],'g',12 ) );
           myMaxEdit->setText( QString::number( range[1],'g',12 ) );
+          myLogarithmicCheck->setChecked(aLookupTable->GetScale() == VTK_SCALE_LOG10);
+          myLogarithmicCheck->setEnabled(range[0] > 1e-07 && range[1] > 1e-07);
         }
 
         vtkTextProperty* aTitleTextPrp = myScalarBarActor->GetTitleTextProperty();
@@ -682,15 +693,14 @@ void SMESHGUI_Preferences_ScalarBarDlg::onSelectionChanged()
         myMonoColorBtn->setColor( QColor( (int)( aTColor[0]*255 ), (int)( aTColor[1]*255 ), (int)( aTColor[2]*255 ) ) );
         if ( coloringType == SMESH_MONOCOLOR_TYPE ) {
           myDMonoColor->setChecked(true);
-          onDistributionChanged(myDistribColorGrp->id(myDMonoColor));    
+          onDistributionChanged(myDistribColorGrp->id(myDMonoColor));
         } else {
           myDMultiColor->setChecked(true);
           onDistributionChanged(myDistribColorGrp->id(myDMultiColor));
         }
         myDistributionGrp->setChecked((bool)myScalarBarActor->GetDistributionVisibility());
         onDistributionActivated(myScalarBarActor->GetDistributionVisibility());
-        
-        
+
         myRangeGrp->setEnabled( true );
         myFontGrp->setEnabled( true );
         myLabColorGrp->setEnabled( true );
@@ -727,6 +737,22 @@ void SMESHGUI_Preferences_ScalarBarDlg::closeEvent( QCloseEvent* e )
   QDialog::closeEvent( e );
 }
 
+//=================================================================================================
+/*!
+ *  SMESHGUI_Preferences_ScalarBarDlg::onMinMaxChanged
+ *
+ *  Called when Scalar Range values are changed
+ */
+//=================================================================================================
+void SMESHGUI_Preferences_ScalarBarDlg::onMinMaxChanged()
+{
+  double aMin = myMinEdit->text().toDouble();
+  double aMax = myMaxEdit->text().toDouble();
+  bool isLogarithmicEnabled = (aMin > 1e-07 && aMax > 1e-07);
+  myLogarithmicCheck->setChecked(isLogarithmicEnabled);
+  myLogarithmicCheck->setEnabled(isLogarithmicEnabled);
+}
+
 //=================================================================================================
 /*!
  *  SMESHGUI_Preferences_ScalarBarDlg::onXYChanged
@@ -833,7 +859,7 @@ void SMESHGUI_Preferences_ScalarBarDlg::initScalarBarFromResources()
   QString name;
   if (mgr){
     // initialize from resoources
-    
+
     // horizontal
     name = QString("scalar_bar_horizontal_%1");
     if (mgr->hasValue("SMESH", name.arg( "x" )))
diff --git a/src/SMESHGUI/SMESHGUI_Preferences_ScalarBarDlg.h b/src/SMESHGUI/SMESHGUI_Preferences_ScalarBarDlg.h
index 804b4aa6a..05dea0f59 100644
--- a/src/SMESHGUI/SMESHGUI_Preferences_ScalarBarDlg.h
+++ b/src/SMESHGUI/SMESHGUI_Preferences_ScalarBarDlg.h
@@ -23,7 +23,7 @@
 // SMESH SMESHGUI : GUI for SMESH component
 // File   : SMESHGUI_Preferences_ScalarBarDlg.h
 // Author : Nicolas REJNERI, Open CASCADE S.A.S.
-//
+
 #ifndef SMESHGUI_PREFERENCES_SCALARBARDLG_H
 #define SMESHGUI_PREFERENCES_SCALARBARDLG_H
 
@@ -78,6 +78,7 @@ protected slots:
   void                     onHelp();
   void                     onSelectionChanged();
   void                     onXYChanged();
+  void                     onMinMaxChanged();
   void                     onOrientationChanged();
   void                     onDistributionChanged( int );
   void                     onDistributionActivated( bool );
@@ -94,6 +95,7 @@ private:
   QGroupBox*               myRangeGrp;
   QLineEdit*               myMinEdit;
   QLineEdit*               myMaxEdit;
+  QCheckBox*               myLogarithmicCheck;
 
   QGroupBox*               myFontGrp;
   QtxColorButton*          myTitleColorBtn;
diff --git a/src/SMESHGUI/SMESH_msg_en.ts b/src/SMESHGUI/SMESH_msg_en.ts
index aa1c2add0..5e82b9bb1 100644
--- a/src/SMESHGUI/SMESH_msg_en.ts
+++ b/src/SMESHGUI/SMESH_msg_en.ts
@@ -1828,6 +1828,10 @@ Check algorithm documentation for supported geometry</translation>
         <source>SMESH_LENGTH</source>
         <translation>Length</translation>
     </message>
+    <message>
+        <source>SMESH_LOGARITHMIC_SCALARBAR</source>
+        <translation>Logarithmic</translation>
+    </message>
     <message>
         <source>SMESH_MAKE_GROUPS</source>
         <translation>Generate groups</translation>
diff --git a/src/SMESHGUI/SMESH_msg_fr.ts b/src/SMESHGUI/SMESH_msg_fr.ts
index 5345d612b..b322da2b2 100755
--- a/src/SMESHGUI/SMESH_msg_fr.ts
+++ b/src/SMESHGUI/SMESH_msg_fr.ts
@@ -1800,6 +1800,10 @@ Référez-vous à la documentation sur l&apos;algorithme et la géométrie suppo
         <source>SMESH_LENGTH</source>
         <translation>Longueur</translation>
     </message>
+    <message>
+        <source>SMESH_LOGARITHMIC_SCALARBAR</source>
+        <translation type="unfinished">Logarithmic</translation>
+    </message>
     <message>
         <source>SMESH_MAKE_GROUPS</source>
         <translation>Générer les groupes</translation>
diff --git a/src/SMESH_I/SMESH_Filter_i.cxx b/src/SMESH_I/SMESH_Filter_i.cxx
index 523bf4677..f7040c5ab 100644
--- a/src/SMESH_I/SMESH_Filter_i.cxx
+++ b/src/SMESH_I/SMESH_Filter_i.cxx
@@ -18,13 +18,12 @@
 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 //
 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
-//
 
 //  SMESH SMESH_I : idl implementation based on 'SMESH' unit's calsses
 //  File   : SMESH_Filter_i.cxx
 //  Author : Alexey Petrov, OCC
 //  Module : SMESH
-//
+
 #include "SMESH_Filter_i.hxx"
 
 #include "SMDS_ElemIterator.hxx"
@@ -580,12 +579,12 @@ CORBA::Double NumericalFunctor_i::GetValue( CORBA::Long theId )
   return myNumericalFunctorPtr->GetValue( theId );
 }
 
-SMESH::Histogram* NumericalFunctor_i::GetHistogram(CORBA::Short nbIntervals)
+SMESH::Histogram* NumericalFunctor_i::GetHistogram(CORBA::Short nbIntervals, CORBA::Boolean isLogarithmic)
 {
   std::vector<int> nbEvents;
   std::vector<double> funValues;
   std::vector<int> elements;
-  myNumericalFunctorPtr->GetHistogram(nbIntervals,nbEvents,funValues,elements);
+  myNumericalFunctorPtr->GetHistogram(nbIntervals,nbEvents,funValues,elements,0,isLogarithmic);
 
 #ifdef WIN32
   nbIntervals = CORBA::Short( min( nbEvents.size(), funValues.size() - 1));
diff --git a/src/SMESH_I/SMESH_Filter_i.hxx b/src/SMESH_I/SMESH_Filter_i.hxx
index cb82aa6d5..d874819a8 100644
--- a/src/SMESH_I/SMESH_Filter_i.hxx
+++ b/src/SMESH_I/SMESH_Filter_i.hxx
@@ -18,13 +18,12 @@
 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 //
 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
-//
 
 //  SMESH SMESH_I : idl implementation based on 'SMESH' unit's calsses
 //  File   : SMESH_Filter_i.hxx
 //  Author : Alexey Petrov, OCC
 //  Module : SMESH
-//
+
 #ifndef _SMESH_FILTER_I_HXX_
 #define _SMESH_FILTER_I_HXX_
 
@@ -162,7 +161,7 @@ namespace SMESH
   {
   public:
     CORBA::Double                   GetValue( CORBA::Long theElementId );
-    SMESH::Histogram*               GetHistogram(CORBA::Short nbIntervals);
+    SMESH::Histogram*               GetHistogram(CORBA::Short nbIntervals, CORBA::Boolean isLogarithmic);
     void                            SetPrecision( CORBA::Long thePrecision );
     CORBA::Long                     GetPrecision();
     Controls::NumericalFunctorPtr   GetNumericalFunctor();