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 // Created on: 1991-03-05
 // Created by: Remy GILET
 // Copyright (c) 1991-1999 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 _GccEnt_HeaderFile
 #define _GccEnt_HeaderFile
 
 #include <GccEnt_Position.hxx>
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 #include <Standard_OStream.hxx>
 
 class GccEnt_QualifiedLin;
 class gp_Lin2d;
 class GccEnt_QualifiedCirc;
 class gp_Circ2d;
 
 //! This package provides an implementation of the qualified
 //! entities useful to create 2d entities with geometric
 //! constraints. The qualifier explains which subfamily of
 //! solutions we want to obtain. It uses the following law: the
 //! matter/the interior side is at the left of the line, if we go
 //! from the beginning to the end.
 //! The qualifiers are:
 //! Enclosing   : the solution(s) must enclose the argument.
 //! Enclosed    : the solution(s) must be enclosed in the
 //! argument.
 //! Outside     : both the solution(s) and the argument must be
 //! outside to each other.
 //! Unqualified : the position is undefined, so give all the
 //! solutions.
 //! The use of a qualifier is always required if such
 //! subfamilies exist. For example, it is not used for a point.
 //! Note:    the interior of a curve is defined as the left-hand
 //! side of the curve in relation to its orientation.
 class GccEnt
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Prints the name of Position type as a String on the Stream.
   static Standard_OStream& Print(const GccEnt_Position thePosition, Standard_OStream& theStream)
   {
     return (theStream << PositionToString(thePosition));
   }
 
   //! Returns the string name for a given position.
   //! @param thePosition position type
   //! @return string identifier from the list UNQUALIFIED ENCLOSING ENCLOSED OUTSIDE NOQUALIFIER
   Standard_EXPORT static Standard_CString PositionToString(GccEnt_Position thePosition);
 
   //! Returns the position from the given string identifier (using case-insensitive comparison).
   //! @param thePositionString string identifier
   //! @return position or GccEnt_unqualified if string identifier is invalid
   static GccEnt_Position PositionFromString(Standard_CString thePositionString)
   {
     GccEnt_Position aPosition = GccEnt_unqualified;
     PositionFromString(thePositionString, aPosition);
     return aPosition;
   }
 
   //! Determines the position from the given string identifier (using case-insensitive comparison).
   //! @param thePositionString string identifier
   //! @param thePosition detected shape type
   //! @return TRUE if string identifier is known
   Standard_EXPORT static Standard_Boolean PositionFromString(Standard_CString thePositionString,
                                                              GccEnt_Position& thePosition);
 
   //! Constructs a qualified line,
   //! so that the relative position to the circle or line of the
   //! solution computed by a construction algorithm using the
   //! qualified circle or line is not qualified, i.e. all solutions apply.
   Standard_EXPORT static GccEnt_QualifiedLin Unqualified(const gp_Lin2d& Obj);
 
   //! Constructs a qualified circle
   //! so that the relative position to the circle or line of the
   //! solution computed by a construction algorithm using the
   //! qualified circle or line is not qualified, i.e. all solutions apply.
   Standard_EXPORT static GccEnt_QualifiedCirc Unqualified(const gp_Circ2d& Obj);
 
   //! Constructs such a qualified circle that the solution
   //! computed by a construction algorithm using the qualified
   //! circle encloses the circle.
   Standard_EXPORT static GccEnt_QualifiedCirc Enclosing(const gp_Circ2d& Obj);
 
   //! Constructs a qualified line,
   //! so that the solution computed by a construction
   //! algorithm using the qualified circle or line is enclosed by
   //! the circle or line.
   Standard_EXPORT static GccEnt_QualifiedLin Enclosed(const gp_Lin2d& Obj);
 
   //! Constructs a qualified circle
   //! so that the solution computed by a construction
   //! algorithm using the qualified circle or line is enclosed by
   //! the circle or line.
   Standard_EXPORT static GccEnt_QualifiedCirc Enclosed(const gp_Circ2d& Obj);
 
   //! Constructs a qualified line,
   //! so that the solution computed by a construction
   //! algorithm using the qualified circle or line and the circle
   //! or line are external to one another.
   Standard_EXPORT static GccEnt_QualifiedLin Outside(const gp_Lin2d& Obj);
 
   //! Constructs a qualified circle
   //! so that the solution computed by a construction
   //! algorithm using the qualified circle or line and the circle
   //! or line are external to one another.
   Standard_EXPORT static GccEnt_QualifiedCirc Outside(const gp_Circ2d& Obj);
 };
 
 #endif // _GccEnt_HeaderFile

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