0031662: Modeling Algorithms - Incomplete result of section operation
[occt.git] / src / TopTrans / TopTrans_CurveTransition.hxx
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42cf5bc1 1// Created on: 1992-01-30
2// Created by: Didier PIFFAULT
3// Copyright (c) 1992-1999 Matra Datavision
4// Copyright (c) 1999-2014 OPEN CASCADE SAS
5//
6// This file is part of Open CASCADE Technology software library.
7//
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.
13//
14// Alternatively, this file may be used under the terms of Open CASCADE
15// commercial license or contractual agreement.
16
17#ifndef _TopTrans_CurveTransition_HeaderFile
18#define _TopTrans_CurveTransition_HeaderFile
19
20#include <Standard.hxx>
21#include <Standard_DefineAlloc.hxx>
22#include <Standard_Handle.hxx>
23
24#include <gp_Dir.hxx>
25#include <Standard_Real.hxx>
26#include <Standard_Boolean.hxx>
27#include <TopAbs_Orientation.hxx>
28#include <TopAbs_State.hxx>
29#include <Standard_Integer.hxx>
30class gp_Dir;
31
32
33//! This algorithm is used to compute the transition
34//! of a Curve intersecting a curvilinear boundary.
35//!
36//! The geometric elements are described locally at
37//! the intersection point by a second order
38//! development.
39//!
40//! The curve is described by the intersection point,
41//! the tangent vector and the curvature.
42//!
43//! The boundary is described by a set of curve
44//! elements, a curve element is either :
45//!
46//! - A curve.
47//!
48//! - A curve and an orientation called a half-curve,
49//! the boundary of the curve is before or after the
50//! intersection point depending on the orientation.
51class TopTrans_CurveTransition
52{
53public:
54
55 DEFINE_STANDARD_ALLOC
56
57
58 //! Create an empty Curve Transition.
59 Standard_EXPORT TopTrans_CurveTransition();
60
61 //! Initialize a Transition with the local description
62 //! of a Curve.
63 Standard_EXPORT void Reset (const gp_Dir& Tgt, const gp_Dir& Norm, const Standard_Real Curv);
64
65 //! Initialize a Transition with the local description
66 //! of a straigth line.
67 Standard_EXPORT void Reset (const gp_Dir& Tgt);
68
69 //! Add a curve element to the boundary. If Or is
70 //! REVERSED the curve is before the intersection,
71 //! else if Or is FORWARD the curv is after the
72 //! intersection and if Or is INTERNAL the
73 //! intersection is in the middle of the curv.
74 Standard_EXPORT void Compare (const Standard_Real Tole, const gp_Dir& Tang, const gp_Dir& Norm, const Standard_Real Curv, const TopAbs_Orientation S, const TopAbs_Orientation Or);
75
76 //! returns the state of the curve before the
77 //! intersection, this is the position relative to the
78 //! boundary of a point very close to the intersection
79 //! on the negative side of the tangent.
80 Standard_EXPORT TopAbs_State StateBefore() const;
81
82 //! returns the state of the curve after the
83 //! intersection, this is the position relative to the
84 //! boundary of a point very close to the intersection
85 //! on the positive side of the tangent.
86 Standard_EXPORT TopAbs_State StateAfter() const;
87
88
89
90
91protected:
92
93
94
95
96
97private:
98
99
100 //! Compare two curvature and return true if N1,C1 is
101 //! before N2,C2 in the edge orientation
102 Standard_EXPORT Standard_Boolean IsBefore (const Standard_Real Tole, const Standard_Real Angl, const gp_Dir& Nor1, const Standard_Real Cur1, const gp_Dir& Nor2, const Standard_Real Cur2) const;
103
104 //! Compare two angles at tolerance Tole
105 Standard_EXPORT Standard_Integer Compare (const Standard_Real Ang1, const Standard_Real Ang2, const Standard_Real Tole) const;
106
107
108 gp_Dir myTgt;
109 gp_Dir myNorm;
110 Standard_Real myCurv;
111 Standard_Boolean Init;
112 gp_Dir TgtFirst;
113 gp_Dir NormFirst;
114 Standard_Real CurvFirst;
115 TopAbs_Orientation TranFirst;
116 gp_Dir TgtLast;
117 gp_Dir NormLast;
118 Standard_Real CurvLast;
119 TopAbs_Orientation TranLast;
120
121
122};
123
124
125
126
127
128
129
130#endif // _TopTrans_CurveTransition_HeaderFile