1 // Created on: 1991-03-05
2 // Created by: Remy GILET
3 // Copyright (c) 1991-1999 Matra Datavision
4 // Copyright (c) 1999-2014 OPEN CASCADE SAS
6 // This file is part of Open CASCADE Technology software library.
8 // This library is free software; you can redistribute it and/or modify it under
9 // the terms of the GNU Lesser General Public License version 2.1 as published
10 // by the Free Software Foundation, with special exception defined in the file
11 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
12 // distribution for complete text of the license and disclaimer of any warranty.
14 // Alternatively, this file may be used under the terms of Open CASCADE
15 // commercial license or contractual agreement.
17 #ifndef _GccEnt_HeaderFile
18 #define _GccEnt_HeaderFile
20 #include <GccEnt_Position.hxx>
21 #include <Standard.hxx>
22 #include <Standard_DefineAlloc.hxx>
23 #include <Standard_Handle.hxx>
25 class GccEnt_QualifiedLin;
27 class GccEnt_QualifiedCirc;
29 class GccEnt_QualifiedLin;
30 class GccEnt_QualifiedCirc;
33 //! This package provides an implementation of the qualified
34 //! entities useful to create 2d entities with geometric
35 //! constraints. The qualifier explains which subfamily of
36 //! solutions we want to obtain. It uses the following law: the
37 //! matter/the interior side is at the left of the line, if we go
38 //! from the beginning to the end.
39 //! The qualifiers are:
40 //! Enclosing : the solution(s) must enclose the argument.
41 //! Enclosed : the solution(s) must be enclosed in the
43 //! Outside : both the solution(s) and the argument must be
44 //! outside to each other.
45 //! Unqualified : the position is undefined, so give all the
47 //! The use of a qualifier is always required if such
48 //! subfamilies exist. For example, it is not used for a point.
49 //! Note: the interior of a curve is defined as the left-hand
50 //! side of the curve in relation to its orientation.
58 //! Prints the name of Position type as a String on the Stream.
59 static Standard_OStream& Print (const GccEnt_Position thePosition, Standard_OStream& theStream)
61 return (theStream << PositionToString (thePosition));
64 //! Returns the string name for a given position.
65 //! @param thePosition position type
66 //! @return string identifier from the list UNQUALIFIED ENCLOSING ENCLOSED OUTSIDE NOQUALIFIER
67 Standard_EXPORT static Standard_CString PositionToString (GccEnt_Position thePosition);
69 //! Returns the position from the given string identifier (using case-insensitive comparison).
70 //! @param thePositionString string identifier
71 //! @return position or GccEnt_unqualified if string identifier is invalid
72 static GccEnt_Position PositionFromString (Standard_CString thePositionString)
74 GccEnt_Position aPosition = GccEnt_unqualified;
75 PositionFromString (thePositionString, aPosition);
79 //! Determines the position from the given string identifier (using case-insensitive comparison).
80 //! @param thePositionString string identifier
81 //! @param thePosition detected shape type
82 //! @return TRUE if string identifier is known
83 Standard_EXPORT static Standard_Boolean PositionFromString (Standard_CString thePositionString,
84 GccEnt_Position& thePosition);
86 //! Constructs a qualified line,
87 //! so that the relative position to the circle or line of the
88 //! solution computed by a construction algorithm using the
89 //! qualified circle or line is not qualified, i.e. all solutions apply.
90 Standard_EXPORT static GccEnt_QualifiedLin Unqualified (const gp_Lin2d& Obj);
92 //! Constructs a qualified circle
93 //! so that the relative position to the circle or line of the
94 //! solution computed by a construction algorithm using the
95 //! qualified circle or line is not qualified, i.e. all solutions apply.
96 Standard_EXPORT static GccEnt_QualifiedCirc Unqualified (const gp_Circ2d& Obj);
99 //! Constructs such a qualified circle that the solution
100 //! computed by a construction algorithm using the qualified
101 //! circle encloses the circle.
102 Standard_EXPORT static GccEnt_QualifiedCirc Enclosing (const gp_Circ2d& Obj);
104 //! Constructs a qualified line,
105 //! so that the solution computed by a construction
106 //! algorithm using the qualified circle or line is enclosed by
107 //! the circle or line.
108 Standard_EXPORT static GccEnt_QualifiedLin Enclosed (const gp_Lin2d& Obj);
110 //! Constructs a qualified circle
111 //! so that the solution computed by a construction
112 //! algorithm using the qualified circle or line is enclosed by
113 //! the circle or line.
114 Standard_EXPORT static GccEnt_QualifiedCirc Enclosed (const gp_Circ2d& Obj);
116 //! Constructs a qualified line,
117 //! so that the solution computed by a construction
118 //! algorithm using the qualified circle or line and the circle
119 //! or line are external to one another.
120 Standard_EXPORT static GccEnt_QualifiedLin Outside (const gp_Lin2d& Obj);
122 //! Constructs a qualified circle
123 //! so that the solution computed by a construction
124 //! algorithm using the qualified circle or line and the circle
125 //! or line are external to one another.
126 Standard_EXPORT static GccEnt_QualifiedCirc Outside (const gp_Circ2d& Obj);
142 friend class GccEnt_QualifiedLin;
143 friend class GccEnt_QualifiedCirc;
153 #endif // _GccEnt_HeaderFile