1 // Created on: 1992-09-28 2 // Created by: Remi GILET 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 _GC_MakeArcOfEllipse_HeaderFile 18 #define _GC_MakeArcOfEllipse_HeaderFile 19 20 #include <Standard.hxx> 21 #include <Standard_DefineAlloc.hxx> 22 #include <Standard_Handle.hxx> 23 24 #include <GC_Root.hxx> 25 #include <Geom_TrimmedCurve.hxx> 26 27 class StdFail_NotDone; 28 class gp_Elips; 29 class gp_Pnt; 30 31 32 //! Implements construction algorithms for an arc 33 //! of ellipse in 3D space. The result is a Geom_TrimmedCurve curve. 34 //! A MakeArcOfEllipse object provides a framework for: 35 //! - defining the construction of the arc of ellipse, 36 //! - implementing the construction algorithm, and 37 //! - consulting the results. In particular, the 38 //! Value function returns the constructed arc of ellipse. 39 class GC_MakeArcOfEllipse : public GC_Root 40 { 41 public: 42 43 DEFINE_STANDARD_ALLOC 44 45 46 //! Constructs an arc of Ellipse (TrimmedCurve from Geom) from 47 //! a Ellipse between two parameters Alpha1 and Alpha2. 48 Standard_EXPORT GC_MakeArcOfEllipse(const gp_Elips& Elips, const Standard_Real Alpha1, const Standard_Real Alpha2, const Standard_Boolean Sense); 49 50 //! Constructs an arc of Ellipse (TrimmedCurve from Geom) from 51 //! a Ellipse between point <P> and the angle Alpha 52 //! given in radians. 53 Standard_EXPORT GC_MakeArcOfEllipse(const gp_Elips& Elips, const gp_Pnt& P, const Standard_Real Alpha, const Standard_Boolean Sense); 54 55 //! Constructs an arc of Ellipse (TrimmedCurve from Geom) from 56 //! a Ellipse between two points P1 and P2. 57 //! The orientation of the arc of ellipse is: 58 //! - the sense of Elips if Sense is true, or 59 //! - the opposite sense if Sense is false. 60 //! Notes: 61 //! - Alpha1, Alpha2 and Alpha are angle values, given in radians. 62 //! - IsDone always returns true. 63 Standard_EXPORT GC_MakeArcOfEllipse(const gp_Elips& Elips, const gp_Pnt& P1, const gp_Pnt& P2, const Standard_Boolean Sense); 64 65 //! Returns the constructed arc of ellipse. 66 Standard_EXPORT const Handle(Geom_TrimmedCurve)& Value() const; 67 operator const Handle(Geom_TrimmedCurve)68 operator const Handle(Geom_TrimmedCurve)& () const { return Value(); } 69 70 private: 71 Handle(Geom_TrimmedCurve) TheArc; 72 }; 73 74 #endif // _GC_MakeArcOfEllipse_HeaderFile 75