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 // Created on: 1996-02-26
 // Created by: Philippe MANGIN
 // Copyright (c) 1996-1999 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 _FairCurve_MinimalVariation_HeaderFile
 #define _FairCurve_MinimalVariation_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 
 #include <FairCurve_Batten.hxx>
 #include <FairCurve_AnalysisCode.hxx>
 #include <Standard_OStream.hxx>
 class gp_Pnt2d;
 class gp_Vec2d;
 
 
 //! Computes a 2D curve using an algorithm which
 //! minimizes tension, sagging, and jerk energy. As in
 //! FairCurve_Batten, two reference points are used.
 //! Unlike that class, FairCurve_MinimalVariation
 //! requires curvature settings at the first and second
 //! reference points. These are defined by the rays of
 //! curvature desired at each point.
 class FairCurve_MinimalVariation  : public FairCurve_Batten
 {
 public:
 
   DEFINE_STANDARD_ALLOC
 
   
   //! Constructs the two contact points P1 and P2  and the geometrical
   //! characteristics of the batten (elastic beam)
   //! These include the real number values for height of
   //! deformation Height, slope value Slope, and kind of
   //! energy PhysicalRatio. The kinds of energy include:
   //! -   Jerk (0)
   //! -   Sagging (1).
   //! Note that the default setting for Physical Ration is in FairCurve_Batten
   //! Other parameters are initialized as follow :
   //! - FreeSliding = False
   //! - ConstraintOrder1 = 1
   //! - ConstraintOrder2 = 1
   //! - Angle1 = 0
   //! - Angle2 = 0
   //! - Curvature1 = 0
   //! - Curvature2 = 0
   //! - SlidingFactor = 1
   //! Warning
   //! If PhysicalRatio equals 1, you cannot impose constraints on curvature.
   //! Exceptions
   //! NegativeValue if Height is less than or equal to 0.
   //! NullValue if the distance between P1 and P2 is less
   //! than or equal to the tolerance value for distance in
   //! Precision::Confusion: P1.IsEqual(P2,
   //! Precision::Confusion()). The function
   //! gp_Pnt2d::IsEqual tests to see if this is the case.
   //! Definition of the geometricals constraints
   Standard_EXPORT FairCurve_MinimalVariation(const gp_Pnt2d& P1, const gp_Pnt2d& P2, const Standard_Real Heigth, const Standard_Real Slope = 0, const Standard_Real PhysicalRatio = 0);
   
   //! Allows you to set a new constraint on curvature at the first point.
     void SetCurvature1 (const Standard_Real Curvature);
   
   //! Allows you to set a new constraint on curvature at the second point.
     void SetCurvature2 (const Standard_Real Curvature);
   
   //! Allows you to set the physical ratio Ratio.
   //! The kinds of energy which you can specify include:
   //! 0 is only "Jerk" Energy
   //! 1 is only "Sagging" Energy like batten
   //! Warning: if Ratio is 1 it is impossible to impose curvature constraints.
   //! Raises  DomainError if Ratio < 0 or Ratio > 1
     void SetPhysicalRatio (const Standard_Real Ratio);
   
   //! Computes the curve with respect to the constraints,
   //! NbIterations and Tolerance. The tolerance setting
   //! allows you to control the precision of computation, and
   //! the maximum number of iterations allows you to set a limit on computation time.
   Standard_EXPORT virtual Standard_Boolean Compute (FairCurve_AnalysisCode& ACode, const Standard_Integer NbIterations = 50, const Standard_Real Tolerance = 1.0e-3) Standard_OVERRIDE;
   
   //! Returns the first established curvature.
     Standard_Real GetCurvature1() const;
   
   //! Returns the second established curvature.
     Standard_Real GetCurvature2() const;
   
   //! Returns the physical ratio, or kind of energy.
     Standard_Real GetPhysicalRatio() const;
   
   //! Prints on the stream o information on the current state
   //! of the object.
   //! Is used to redefine the operator <<.
   Standard_EXPORT virtual void Dump (Standard_OStream& o) const Standard_OVERRIDE;
 
 
 
 
 protected:
 
 
 
 
 
 private:
 
   
   //! compute the curve with respect of the delta-constraints.
   Standard_EXPORT Standard_Boolean Compute (const gp_Vec2d& DeltaP1, const gp_Vec2d& DeltaP2, const Standard_Real DeltaAngle1, const Standard_Real DeltaAngle2, const Standard_Real DeltaCurvature1, const Standard_Real DeltaCurvature2, FairCurve_AnalysisCode& ACode, const Standard_Integer NbIterations, const Standard_Real Tolerance);
 
 
   Standard_Real OldCurvature1;
   Standard_Real OldCurvature2;
   Standard_Real OldPhysicalRatio;
   Standard_Real NewCurvature1;
   Standard_Real NewCurvature2;
   Standard_Real NewPhysicalRatio;
 
 
 };
 
 
 #include <FairCurve_MinimalVariation.lxx>
 
 
 
 
 
 #endif // _FairCurve_MinimalVariation_HeaderFile

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