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 // Created on: 1992-01-17
 // Created by: GG
 // Copyright (c) 1992-1999 Matra Datavision
 // Copyright (c) 1999-2014 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _V3d_Viewer_HeaderFile
 #define _V3d_Viewer_HeaderFile
 
 #include <Aspect_GridDrawMode.hxx>
 #include <Aspect_GridType.hxx>
 #include <Graphic3d_StructureManager.hxx>
 #include <Graphic3d_Vertex.hxx>
 #include <Graphic3d_ZLayerSettings.hxx>
 #include <TColStd_MapOfInteger.hxx>
 #include <TColStd_SequenceOfInteger.hxx>
 #include <TCollection_ExtendedString.hxx>
 #include <V3d_ListOfLight.hxx>
 #include <V3d_ListOfView.hxx>
 #include <V3d_TypeOfOrientation.hxx>
 #include <V3d_TypeOfView.hxx>
 #include <V3d_TypeOfVisualization.hxx>
 #include <Quantity_Color.hxx>
 
 class Aspect_Grid;
 class Graphic3d_AspectMarker3d;
 class Graphic3d_GraphicDriver;
 class Graphic3d_Group;
 class Graphic3d_Structure;
 class V3d_CircularGrid;
 class V3d_RectangularGrid;
 class V3d_View;
 
 //! Defines services on Viewer type objects.
 //! The methods of this class allow editing and
 //! interrogation of the parameters linked to the viewer
 //! its friend classes (View,light,plane).
 class V3d_Viewer : public Standard_Transient
 {
   friend class V3d_View;
   DEFINE_STANDARD_RTTIEXT(V3d_Viewer, Standard_Transient)
 public:
 
   //! Create a Viewer with the given graphic driver and with default parameters:
   //! - View orientation: V3d_XposYnegZpos
   //! - View background: Quantity_NOC_GRAY30
   //! - Shading model: V3d_GOURAUD
   Standard_EXPORT V3d_Viewer (const Handle(Graphic3d_GraphicDriver)& theDriver);
 
   //! Returns True if One View more can be defined in this Viewer.
   Standard_EXPORT Standard_Boolean IfMoreViews() const;
 
   //! Creates a view in the viewer according to its default parameters.
   Standard_EXPORT Handle(V3d_View) CreateView();
   
   //! Activates all of the views of a viewer attached to a window.
   Standard_EXPORT void SetViewOn();
   
   //! Activates a particular view in the Viewer.
   //! Must be call if the Window attached to the view has been Deiconified.
   Standard_EXPORT void SetViewOn (const Handle(V3d_View)& theView);
 
   //! Deactivates all the views of a Viewer
   //! attached to a window.
   Standard_EXPORT void SetViewOff();
   
   //! Deactivates a particular view in the Viewer.
   //! Must be call if the Window attached to the view
   //! has been Iconified .
   Standard_EXPORT void SetViewOff (const Handle(V3d_View)& theView);
   
   //! Deprecated, Redraw() should be used instead.
   void Update() { Redraw(); }
 
   //! Redraws all the views of the Viewer even if no
   //! modification has taken place. Must be called if
   //! all the views of the Viewer are exposed, as for
   //! example in a global DeIconification.
   Standard_EXPORT void Redraw() const;
   
   //! Updates layer of immediate presentations.
   Standard_EXPORT void RedrawImmediate() const;
   
   //! Invalidates viewer content but does not redraw it.
   Standard_EXPORT void Invalidate() const;
   
   //! Suppresses the Viewer.
   Standard_EXPORT void Remove();
 
   //! Return Graphic Driver instance.
   const Handle(Graphic3d_GraphicDriver)& Driver() const { return myDriver; }
 
   //! Returns the structure manager associated to this viewer.
   Handle(Graphic3d_StructureManager) StructureManager() const { return myStructureManager; }
 
   //! Return default Rendering Parameters.
   //! By default these parameters are set in a new V3d_View.
   const Graphic3d_RenderingParams& DefaultRenderingParams() const { return myDefaultRenderingParams; }
 
   //! Set default Rendering Parameters.
   void SetDefaultRenderingParams (const Graphic3d_RenderingParams& theParams) { myDefaultRenderingParams = theParams; }
 
   //! Defines the default background colour of views
   //! attached to the viewer by supplying the color object
   void SetDefaultBackgroundColor (const Quantity_Color& theColor) { myBackground.SetColor (theColor); }
 
   //! Returns the gradient background of the view.
   const Aspect_GradientBackground& GetGradientBackground() const { return myGradientBackground; }
   
   //! Defines the default gradient background colours of views
   //! attached to the viewer by supplying the colour objects
   void SetDefaultBgGradientColors (const Quantity_Color& theColor1,
                                    const Quantity_Color& theColor2,
                                    const Aspect_GradientFillMethod theFillStyle = Aspect_GradientFillMethod_Horizontal)
   {
     myGradientBackground.SetColors (theColor1, theColor2, theFillStyle);
   }
 
   //! Returns the default size of the view.
   Standard_Real DefaultViewSize() const { return myViewSize; }
 
   //! Gives a default size for the creation of views of the viewer.
   Standard_EXPORT void SetDefaultViewSize (const Standard_Real theSize);
 
   //! Returns the default Projection.
   V3d_TypeOfOrientation DefaultViewProj() const { return myViewProj; }
 
   //! Sets the default projection for creating views in the viewer.
   void SetDefaultViewProj (const V3d_TypeOfOrientation theOrientation) { myViewProj = theOrientation; }
 
   //! Returns the default type of Visualization.
   V3d_TypeOfVisualization DefaultVisualization() const { return myVisualization; }
 
   //! Gives the default visualization mode.
   void SetDefaultVisualization (const V3d_TypeOfVisualization theType) { myVisualization = theType; }
 
   //! Returns the default type of Shading; Graphic3d_TypeOfShadingModel_Phong by default.
   Graphic3d_TypeOfShadingModel DefaultShadingModel() const { return myDefaultRenderingParams.ShadingModel; }
 
   //! Gives the default type of SHADING.
   void SetDefaultShadingModel (const Graphic3d_TypeOfShadingModel theType) { myDefaultRenderingParams.ShadingModel = theType; }
 
   //! Returns the default type of View (orthographic or perspective projection) to be returned by CreateView() method.
   V3d_TypeOfView DefaultTypeOfView() const { return myDefaultTypeOfView; }
 
   //! Set the default type of View (orthographic or perspective projection) to be returned by CreateView() method.
   void SetDefaultTypeOfView (const V3d_TypeOfView theType) { myDefaultTypeOfView = theType; }
 
   //! Returns the default background colour object.
   Quantity_Color DefaultBackgroundColor() const { return myBackground.Color(); }
 
   //! Returns the gradient background colour objects of the view.
   void DefaultBgGradientColors (Quantity_Color& theColor1, Quantity_Color& theColor2) const { myGradientBackground.Colors (theColor1, theColor2); }
 
   //! Return all Z layer ids in sequence ordered by overlay level from lowest layer to highest ( foreground ).
   //! The first layer ID in sequence is the default layer that can't be removed.
   Standard_EXPORT void GetAllZLayers (TColStd_SequenceOfInteger& theLayerSeq) const;
 
   //! Add a new top-level Z layer to all managed views and get its ID as <theLayerId> value.
   //! The Z layers are controlled entirely by viewer, it is not possible to add a layer to a particular view.
   //! Custom layers will be inserted before Graphic3d_ZLayerId_Top (e.g. between Graphic3d_ZLayerId_Default and before Graphic3d_ZLayerId_Top).
   //! @param theLayerId [out] id of created layer
   //! @param theSettings [in] new layer settings
   //! @return FALSE if the layer can not be created
   Standard_Boolean AddZLayer (Graphic3d_ZLayerId& theLayerId,
                               const Graphic3d_ZLayerSettings& theSettings = Graphic3d_ZLayerSettings())
   {
     return InsertLayerBefore (theLayerId, theSettings, Graphic3d_ZLayerId_Top);
   }
 
   //! Add a new top-level Z layer to all managed views and get its ID as <theLayerId> value.
   //! The Z layers are controlled entirely by viewer, it is not possible to add a layer to a particular view.
   //! Layer rendering order is defined by its position in list (altered by theLayerAfter)
   //! and IsImmediate() flag (all layers with IsImmediate() flag are drawn afterwards);
   //! @param theNewLayerId [out] id of created layer; layer id is arbitrary and does not depend on layer position in the list
   //! @param theSettings    [in] new layer settings
   //! @param theLayerAfter  [in] id of layer to append new layer before
   //! @return FALSE if the layer can not be created
   Standard_EXPORT Standard_Boolean InsertLayerBefore (Graphic3d_ZLayerId& theNewLayerId,
                                                       const Graphic3d_ZLayerSettings& theSettings,
                                                       const Graphic3d_ZLayerId theLayerAfter);
 
   //! Add a new top-level Z layer to all managed views and get its ID as <theLayerId> value.
   //! The Z layers are controlled entirely by viewer, it is not possible to add a layer to a particular view.
   //! Layer rendering order is defined by its position in list (altered by theLayerAfter)
   //! and IsImmediate() flag (all layers with IsImmediate() flag are drawn afterwards);
   //! @param theNewLayerId [out] id of created layer; layer id is arbitrary and does not depend on layer position in the list
   //! @param theSettings    [in] new layer settings
   //! @param theLayerBefore [in] id of layer to append new layer after
   //! @return FALSE if the layer can not be created
   Standard_EXPORT Standard_Boolean InsertLayerAfter (Graphic3d_ZLayerId& theNewLayerId,
                                                      const Graphic3d_ZLayerSettings& theSettings,
                                                      const Graphic3d_ZLayerId theLayerBefore);
 
   //! Remove Z layer with ID <theLayerId>.
   //! Method returns Standard_False if the layer can not be removed or doesn't exists.
   //! By default, there are always default bottom-level layer that can't be removed.
   Standard_EXPORT Standard_Boolean RemoveZLayer (const Graphic3d_ZLayerId theLayerId);
 
   //! Returns the settings of a single Z layer.
   Standard_EXPORT const Graphic3d_ZLayerSettings& ZLayerSettings (const Graphic3d_ZLayerId theLayerId) const;
 
   //! Sets the settings for a single Z layer.
   Standard_EXPORT void SetZLayerSettings (const Graphic3d_ZLayerId theLayerId, const Graphic3d_ZLayerSettings& theSettings);
 
 public:
 
   //! Return a list of active views.
   const V3d_ListOfView& ActiveViews() const { return myActiveViews; }
 
   //! Return an iterator for active views.
   V3d_ListOfViewIterator ActiveViewIterator() const { return V3d_ListOfViewIterator (myActiveViews); }
 
   //! returns true if there is only one active view.
   Standard_Boolean LastActiveView() const { return myActiveViews.Extent() == 1; }
 
 public:
 
   //! Return a list of defined views.
   const V3d_ListOfView& DefinedViews() const { return myDefinedViews; }
 
   //! Return an iterator for defined views.
   V3d_ListOfViewIterator DefinedViewIterator() const { return V3d_ListOfViewIterator (myDefinedViews); }
 
 public: //! @name lights management
 
   //! Defines default lights:
   //!  positional-light 0.3 0. 0.
   //!  directional-light V3d_XnegYposZpos
   //!  directional-light V3d_XnegYneg
   //!  ambient-light
   Standard_EXPORT void SetDefaultLights();
 
   //! Activates MyLight in the viewer.
   Standard_EXPORT void SetLightOn (const Handle(V3d_Light)& theLight);
   
   //! Activates all the lights defined in this viewer.
   Standard_EXPORT void SetLightOn();
   
   //! Deactivates MyLight in this viewer.
   Standard_EXPORT void SetLightOff (const Handle(V3d_Light)& theLight);
   
   //! Deactivate all the Lights defined in this viewer.
   Standard_EXPORT void SetLightOff();
 
   //! Adds Light in Sequence Of Lights.
   Standard_EXPORT void AddLight (const Handle(V3d_Light)& theLight);
 
   //! Delete Light in Sequence Of Lights.
   Standard_EXPORT void DelLight (const Handle(V3d_Light)& theLight);
   
   //! Updates the lights of all the views of a viewer.
   Standard_EXPORT void UpdateLights();
 
   Standard_EXPORT Standard_Boolean IsGlobalLight (const Handle(V3d_Light)& TheLight) const;
 
   //! Return a list of active lights.
   const V3d_ListOfLight& ActiveLights() const { return myActiveLights; }
 
   //! Return an iterator for defined lights.
   V3d_ListOfLightIterator ActiveLightIterator() const { return V3d_ListOfLightIterator (myActiveLights); }
 
 public:
 
   //! Return a list of defined lights.
   const V3d_ListOfLight& DefinedLights() const { return myDefinedLights; }
 
   //! Return an iterator for defined lights.
   V3d_ListOfLightIterator DefinedLightIterator() const { return V3d_ListOfLightIterator (myDefinedLights); }
 
 public: //! @name objects management
 
   //! Erase all Objects in All the views.
   Standard_EXPORT void Erase() const;
 
   //! UnHighlight all Objects in All the views.
   Standard_EXPORT void UnHighlight() const;
 
 public:
 
   //! returns true if the computed mode can be used.
   Standard_Boolean ComputedMode() const { return myComputedMode; }
 
   //! Set if the computed mode can be used.
   void SetComputedMode (const Standard_Boolean theMode) { myComputedMode = theMode; }
 
   //! returns true if by default the computed mode must be used.
   Standard_Boolean DefaultComputedMode() const { return myDefaultComputedMode; }
 
   //! Set if by default the computed mode must be used.
   void SetDefaultComputedMode (const Standard_Boolean theMode) { myDefaultComputedMode = theMode; }
 
 public: //! @name privileged plane management
 
   const gp_Ax3& PrivilegedPlane() const { return myPrivilegedPlane; }
 
   Standard_EXPORT void SetPrivilegedPlane (const gp_Ax3& thePlane);
 
   Standard_EXPORT void DisplayPrivilegedPlane (const Standard_Boolean theOnOff, const Standard_Real theSize = 1);
 
 public: //! @name grid management
 
   //! Activates the grid in all views of <me>.
   Standard_EXPORT void ActivateGrid (const Aspect_GridType aGridType, const Aspect_GridDrawMode aGridDrawMode);
   
   //! Deactivates the grid in all views of <me>.
   Standard_EXPORT void DeactivateGrid();
   
   //! Show/Don't show grid echo to the hit point.
   //! If TRUE,the grid echo will be shown at ConvertToGrid() time.
   Standard_EXPORT void SetGridEcho (const Standard_Boolean showGrid = Standard_True);
   
   //! Show grid echo <aMarker> to the hit point.
   //! Warning: When the grid echo marker is not set,
   //! a default marker is build with the attributes:
   //! marker type : Aspect_TOM_STAR
   //! marker color : Quantity_NOC_GRAY90
   //! marker size : 3.0
   Standard_EXPORT void SetGridEcho (const Handle(Graphic3d_AspectMarker3d)& aMarker);
   
   //! Returns TRUE when grid echo must be displayed at hit point.
   Standard_Boolean GridEcho() const { return myGridEcho; }
 
   //! Returns Standard_True if a grid is activated in <me>.
   Standard_EXPORT Standard_Boolean IsGridActive();
 
   //! Returns the defined grid in <me>.
   Handle(Aspect_Grid) Grid (bool theToCreate = true) { return Grid (myGridType, theToCreate); }
 
   //! Returns the defined grid in <me>.
   Standard_EXPORT Handle(Aspect_Grid) Grid (Aspect_GridType theGridType, bool theToCreate = true);
 
   //! Returns the current grid type defined in <me>.
   Aspect_GridType GridType() const { return myGridType; }
 
   //! Returns the current grid draw mode defined in <me>.
   Standard_EXPORT Aspect_GridDrawMode GridDrawMode();
 
   //! Returns the definition of the rectangular grid.
   Standard_EXPORT void RectangularGridValues (Standard_Real& theXOrigin, Standard_Real& theYOrigin,
                                               Standard_Real& theXStep, Standard_Real& theYStep,
                                               Standard_Real& theRotationAngle);
 
   //! Sets the definition of the rectangular grid.
   //! <XOrigin>, <YOrigin> defines the origin of the grid.
   //! <XStep> defines the interval between 2 vertical lines.
   //! <YStep> defines the interval between 2 horizontal lines.
   //! <RotationAngle> defines the rotation angle of the grid.
   Standard_EXPORT void SetRectangularGridValues (const Standard_Real XOrigin, const Standard_Real YOrigin, const Standard_Real XStep, const Standard_Real YStep, const Standard_Real RotationAngle);
 
   //! Returns the definition of the circular grid.
   Standard_EXPORT void CircularGridValues (Standard_Real& theXOrigin, Standard_Real& theYOrigin,
                                            Standard_Real& theRadiusStep,
                                            Standard_Integer& theDivisionNumber,
                                            Standard_Real& theRotationAngle);
 
   //! Sets the definition of the circular grid.
   //! <XOrigin>, <YOrigin> defines the origin of the grid.
   //! <RadiusStep> defines the interval between 2 circles.
   //! <DivisionNumber> defines the section number of one half circle.
   //! <RotationAngle> defines the rotation angle of the grid.
   Standard_EXPORT void SetCircularGridValues (const Standard_Real XOrigin, const Standard_Real YOrigin, const Standard_Real RadiusStep, const Standard_Integer DivisionNumber, const Standard_Real RotationAngle);
 
   //! Returns the location and the size of the grid.
   Standard_EXPORT void CircularGridGraphicValues (Standard_Real& theRadius,
                                                   Standard_Real& theOffSet);
 
   //! Sets the location and the size of the grid.
   //! <XSize> defines the width of the grid.
   //! <YSize> defines the height of the grid.
   //! <OffSet> defines the displacement along the plane normal.
   Standard_EXPORT void SetCircularGridGraphicValues (const Standard_Real Radius, const Standard_Real OffSet);
 
   //! Returns the location and the size of the grid.
   Standard_EXPORT void RectangularGridGraphicValues (Standard_Real& theXSize, Standard_Real& theYSize,
                                                      Standard_Real& theOffSet);
 
   //! Sets the location and the size of the grid.
   //! <XSize> defines the width of the grid.
   //! <YSize> defines the height of the grid.
   //! <OffSet> defines the displacement along the plane normal.
   Standard_EXPORT void SetRectangularGridGraphicValues (const Standard_Real XSize, const Standard_Real YSize, const Standard_Real OffSet);
   
   //! Display grid echo at requested point in the view.
   Standard_EXPORT void ShowGridEcho (const Handle(V3d_View)& theView, const Graphic3d_Vertex& thePoint);
 
   //! Temporarly hide grid echo.
   Standard_EXPORT void HideGridEcho (const Handle(V3d_View)& theView);
 
 public: //! @name deprecated methods
 
   //! Returns Standard_True if a grid is activated in <me>.
   Standard_DEPRECATED ("Deprecated method - IsGridActive() should be used instead")
   Standard_Boolean IsActive() { return IsGridActive(); }
 
   //! Initializes an internal iterator on the active views.
   Standard_DEPRECATED ("Deprecated method - ActiveViews() should be used instead")
   void InitActiveViews() { myActiveViewsIterator.Initialize (myActiveViews); }
 
   //! Returns true if there are more active view(s) to return.
   Standard_DEPRECATED ("Deprecated method - ActiveViews() should be used instead")
   Standard_Boolean MoreActiveViews() const { return myActiveViewsIterator.More(); }
 
   //! Go to the next active view (if there is not, ActiveView will raise an exception)
   Standard_DEPRECATED ("Deprecated method - ActiveViews() should be used instead")
   void NextActiveViews() { if (!myActiveViews.IsEmpty()) myActiveViewsIterator.Next(); }
 
   Standard_DEPRECATED ("Deprecated method - ActiveViews() should be used instead")
   const Handle(V3d_View)& ActiveView() const { return myActiveViewsIterator.Value(); }
 
   //! Initializes an internal iterator on the Defined views.
   Standard_DEPRECATED ("Deprecated method - DefinedViews() should be used instead")
   void InitDefinedViews() { myDefinedViewsIterator.Initialize (myDefinedViews); }
 
   //! returns true if there are more Defined view(s) to return.
   Standard_DEPRECATED ("Deprecated method - DefinedViews() should be used instead")
   Standard_Boolean MoreDefinedViews() const { return myDefinedViewsIterator.More(); }
 
   //! Go to the next Defined view (if there is not, DefinedView will raise an exception)
   Standard_DEPRECATED ("Deprecated method - DefinedViews() should be used instead")
   void NextDefinedViews() { if (!myDefinedViews.IsEmpty()) myDefinedViewsIterator.Next(); }
 
   Standard_DEPRECATED ("Deprecated method - DefinedViews() should be used instead")
   const Handle(V3d_View)& DefinedView() const { return myDefinedViewsIterator.Value(); }
 
   //! Initializes an internal iteratator on the active Lights.
   Standard_DEPRECATED ("Deprecated method - ActiveLights() should be used instead")
   void InitActiveLights() { myActiveLightsIterator.Initialize (myActiveLights); }
 
   //! returns true if there are more active Light(s) to return.
   Standard_DEPRECATED ("Deprecated method - ActiveLights() should be used instead")
   Standard_Boolean MoreActiveLights() const { return myActiveLightsIterator.More(); }
 
   //! Go to the next active Light (if there is not, ActiveLight() will raise an exception)
   Standard_DEPRECATED ("Deprecated method - ActiveLights() should be used instead")
   void NextActiveLights() { myActiveLightsIterator.Next(); }
 
   Standard_DEPRECATED ("Deprecated method - ActiveLights() should be used instead")
   const Handle(V3d_Light)& ActiveLight() const { return myActiveLightsIterator.Value(); }
 
   //! Initializes an internal iterattor on the Defined Lights.
   Standard_DEPRECATED ("Deprecated method - DefinedLights() should be used instead")
   void InitDefinedLights() { myDefinedLightsIterator.Initialize (myDefinedLights); }
 
   //! Returns true if there are more Defined Light(s) to return.
   Standard_DEPRECATED ("Deprecated method - DefinedLights() should be used instead")
   Standard_Boolean MoreDefinedLights() const { return myDefinedLightsIterator.More(); }
 
   //! Go to the next Defined Light (if there is not, DefinedLight() will raise an exception)
   Standard_DEPRECATED ("Deprecated method - DefinedLights() should be used instead")
   void NextDefinedLights() { if (!myDefinedLights.IsEmpty()) myDefinedLightsIterator.Next(); }
 
   Standard_DEPRECATED ("Deprecated method - DefinedLights() should be used instead")
   const Handle(V3d_Light)& DefinedLight() const { return myDefinedLightsIterator.Value(); }
 
   //! Dumps the content of me into the stream
   Standard_EXPORT void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const;
 
 private:
 
   //! Returns the default background colour.
   const Aspect_Background& GetBackgroundColor() const { return myBackground; }
 
   //! Adds View in Sequence Of Views.
   Standard_EXPORT void AddView (const Handle(V3d_View)& theView);
   
   //! Delete View in Sequence Of Views.
   Standard_EXPORT void DelView (const V3d_View* theView);
   
 private:
 
   Handle(Graphic3d_GraphicDriver) myDriver;
   Handle(Graphic3d_StructureManager) myStructureManager;
   TColStd_MapOfInteger myLayerIds;
   Aspect_GenId myZLayerGenId;
 
   V3d_ListOfView  myDefinedViews;
   V3d_ListOfView  myActiveViews;
   V3d_ListOfLight myDefinedLights;
   V3d_ListOfLight myActiveLights;
 
   Aspect_Background myBackground;
   Aspect_GradientBackground myGradientBackground;
   Standard_Real myViewSize;
   V3d_TypeOfOrientation myViewProj;
   V3d_TypeOfVisualization myVisualization;
   V3d_TypeOfView myDefaultTypeOfView;
   Graphic3d_RenderingParams myDefaultRenderingParams;
 
   V3d_ListOfView::Iterator  myActiveViewsIterator;
   V3d_ListOfView::Iterator  myDefinedViewsIterator;
   V3d_ListOfLight::Iterator myActiveLightsIterator;
   V3d_ListOfLight::Iterator myDefinedLightsIterator;
 
   Standard_Boolean myComputedMode;
   Standard_Boolean myDefaultComputedMode;
 
   gp_Ax3 myPrivilegedPlane;
   Handle(Graphic3d_Structure) myPlaneStructure;
   Standard_Boolean myDisplayPlane;
   Standard_Real myDisplayPlaneLength;
 
   Handle(V3d_RectangularGrid) myRGrid;
   Handle(V3d_CircularGrid) myCGrid;
   Aspect_GridType myGridType;
   Standard_Boolean myGridEcho;
   Handle(Graphic3d_Structure) myGridEchoStructure;
   Handle(Graphic3d_Group) myGridEchoGroup;
   Handle(Graphic3d_AspectMarker3d) myGridEchoAspect;
   Graphic3d_Vertex myGridEchoLastVert;
 
 };
 
 DEFINE_STANDARD_HANDLE(V3d_Viewer, Standard_Transient)
 
 #endif // _V3d_Viewer_HeaderFile

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