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 // Copyright (c) 1995-1999 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 _PrsDim_RadiusDimension_HeaderFile
 #define _PrsDim_RadiusDimension_HeaderFile
 
 #include <PrsDim_Dimension.hxx>
 #include <gp_Pnt.hxx>
 #include <gp_Circ.hxx>
 #include <Standard.hxx>
 #include <Standard_Macro.hxx>
 
 //! Radius dimension. Can be constructed:
 //! - On generic circle.
 //! - On generic circle with user-defined anchor point on that circle.
 //! - On generic shape containing geometry that can be measured
 //!   by diameter dimension: circle wire, arc, circular face, etc.
 //! The anchor point is the location of left attachment point of
 //! dimension on the circle. It can be user-specified, or computed as
 //! middle point on the arc. The radius dimension always lies in the
 //! plane of the measured circle. The dimension is considered as
 //! invalid if the user-specified anchor point is not lying on the circle,
 //! if the radius of the circle is less than Precision::Confusion().
 //! In case if the dimension is built on the arbitrary shape,
 //! it can be considered as invalid if the shape does not contain
 //! circle geometry.
 class PrsDim_RadiusDimension : public PrsDim_Dimension
 {
   DEFINE_STANDARD_RTTIEXT(PrsDim_RadiusDimension, PrsDim_Dimension)
 public:
   //! Create radius dimension for the circle geometry.
   //! @param[in] theCircle  the circle to measure.
   Standard_EXPORT PrsDim_RadiusDimension(const gp_Circ& theCircle);
 
   //! Create radius dimension for the circle geometry and define its
   //! orientation by location of the first point on that circle.
   //! @param[in] theCircle  the circle to measure.
   //! @param[in] theAnchorPoint  the point to define the position
   //!        of the dimension attachment on the circle.
   Standard_EXPORT PrsDim_RadiusDimension(const gp_Circ& theCircle, const gp_Pnt& theAnchorPoint);
 
   //! Create radius dimension for the arbitrary shape (if possible).
   //! @param[in] theShape  the shape to measure.
   Standard_EXPORT PrsDim_RadiusDimension(const TopoDS_Shape& theShape);
 
 public:
   //! @return measured geometry circle.
   const gp_Circ& Circle() const { return myCircle; }
 
   //! @return anchor point on circle for radius dimension.
   const gp_Pnt& AnchorPoint() const { return myAnchorPoint; }
 
   //! @return the measured shape.
   const TopoDS_Shape& Shape() const { return myShape; }
 
 public:
   //! Measure radius of the circle.
   //! The dimension will become invalid if the radius of the circle
   //! is less than Precision::Confusion().
   //! @param[in] theCircle  the circle to measure.
   void SetMeasuredGeometry(const gp_Circ& theCircle)
   {
     SetMeasuredGeometry(theCircle, gp_Pnt(), false);
   }
 
   //! Measure radius of the circle and orient the dimension so
   //! the dimension lines attaches to anchor point on the circle.
   //! The dimension will become invalid if the radius of the circle
   //! is less than Precision::Confusion().
   //! @param[in] theCircle  the circle to measure.
   //! @param[in] theAnchorPoint  the point to attach the dimension lines, should be on the circle
   //! @param[in] theHasAnchor    should be set TRUE if theAnchorPoint should be used
   Standard_EXPORT void SetMeasuredGeometry(const gp_Circ& theCircle,
                                            const gp_Pnt&  theAnchorPoint,
                                            const bool     theHasAnchor = true);
 
   //! Measure radius on the passed shape, if applicable.
   //! The dimension will become invalid if the passed shape is not
   //! measurable or if measured diameter value is less than Precision::Confusion().
   //! @param[in] theShape  the shape to measure.
   void SetMeasuredGeometry(const TopoDS_Shape& theShape)
   {
     SetMeasuredGeometry(theShape, gp_Pnt(), false);
   }
 
   //! Measure radius on the passed shape, if applicable.
   //! The dimension will become invalid if the passed shape is not
   //! measurable or if measured diameter value is less than Precision::Confusion().
   //! @param[in] theShape  the shape to measure.
   //! @param[in] theAnchorPoint  the point to attach the dimension lines, should be on the circle
   //! @param[in] theHasAnchor    should be set TRUE if theAnchorPoint should be used
   Standard_EXPORT void SetMeasuredGeometry(const TopoDS_Shape& theShape,
                                            const gp_Pnt&       theAnchorPoint,
                                            const bool          theHasAnchor = true);
 
   //! @return the display units string.
   Standard_EXPORT const TCollection_AsciiString& GetDisplayUnits() const override;
 
   //! @return the model units string.
   Standard_EXPORT const TCollection_AsciiString& GetModelUnits() const override;
 
   Standard_EXPORT void SetDisplayUnits(const TCollection_AsciiString& theUnits) override;
 
   Standard_EXPORT void SetModelUnits(const TCollection_AsciiString& theUnits) override;
 
   Standard_EXPORT void SetTextPosition(const gp_Pnt& theTextPos) override;
 
   Standard_EXPORT gp_Pnt GetTextPosition() const override;
 
 protected:
   Standard_EXPORT virtual void ComputePlane();
 
   //! Checks if anchor point and the center of the circle are on the plane.
   Standard_EXPORT bool CheckPlane(const gp_Pln& thePlane) const override;
 
   Standard_EXPORT double ComputeValue() const override;
 
   Standard_EXPORT void Compute(const occ::handle<PrsMgr_PresentationManager>& thePrsMgr,
                                const occ::handle<Prs3d_Presentation>&         thePrs,
                                const int                                      theMode) override;
 
 protected:
   Standard_EXPORT bool IsValidCircle(const gp_Circ& theCircle) const;
 
   Standard_EXPORT bool IsValidAnchor(const gp_Circ& theCircle, const gp_Pnt& thePnt) const;
 
 private:
   gp_Circ      myCircle;
   gp_Pnt       myAnchorPoint;
   TopoDS_Shape myShape;
 };
 
 #endif // _PrsDim_RadiusDimension_HeaderFile

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