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0001 // Created on: 1997-09-11 0002 // Created by: Roman BORISOV 0003 // Copyright (c) 1997-1999 Matra Datavision 0004 // Copyright (c) 1999-2014 OPEN CASCADE SAS 0005 // 0006 // This file is part of Open CASCADE Technology software library. 0007 // 0008 // This library is free software; you can redistribute it and/or modify it under 0009 // the terms of the GNU Lesser General Public License version 2.1 as published 0010 // by the Free Software Foundation, with special exception defined in the file 0011 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT 0012 // distribution for complete text of the license and disclaimer of any warranty. 0013 // 0014 // Alternatively, this file may be used under the terms of Open CASCADE 0015 // commercial license or contractual agreement. 0016 0017 #ifndef _Geom2dConvert_ApproxCurve_HeaderFile 0018 #define _Geom2dConvert_ApproxCurve_HeaderFile 0019 0020 #include <Adaptor2d_Curve2d.hxx> 0021 #include <GeomAbs_Shape.hxx> 0022 #include <Standard_OStream.hxx> 0023 0024 class Geom2d_BSplineCurve; 0025 class Geom2d_Curve; 0026 0027 //! A framework to convert a 2D curve to a BSpline. 0028 //! This is done by approximation within a given tolerance. 0029 class Geom2dConvert_ApproxCurve 0030 { 0031 public: 0032 DEFINE_STANDARD_ALLOC 0033 0034 //! Constructs an approximation framework defined by 0035 //! - the 2D conic Curve 0036 //! - the tolerance value Tol2d 0037 //! - the degree of continuity Order 0038 //! - the maximum number of segments allowed MaxSegments 0039 //! - the highest degree MaxDegree which the 0040 //! polynomial defining the BSpline is allowed to have. 0041 Standard_EXPORT Geom2dConvert_ApproxCurve(const occ::handle<Geom2d_Curve>& Curve, 0042 const double Tol2d, 0043 const GeomAbs_Shape Order, 0044 const int MaxSegments, 0045 const int MaxDegree); 0046 0047 //! Constructs an approximation framework defined by 0048 //! - the 2D conic Curve 0049 //! - the tolerance value Tol2d 0050 //! - the degree of continuity Order 0051 //! - the maximum number of segments allowed MaxSegments 0052 //! - the highest degree MaxDegree which the 0053 //! polynomial defining the BSpline is allowed to have. 0054 Standard_EXPORT Geom2dConvert_ApproxCurve(const occ::handle<Adaptor2d_Curve2d>& Curve, 0055 const double Tol2d, 0056 const GeomAbs_Shape Order, 0057 const int MaxSegments, 0058 const int MaxDegree); 0059 0060 //! Returns the 2D BSpline curve resulting from the 0061 //! approximation algorithm. 0062 Standard_EXPORT occ::handle<Geom2d_BSplineCurve> Curve() const; 0063 0064 //! returns true if the approximation has 0065 //! been done with within required tolerance 0066 Standard_EXPORT bool IsDone() const; 0067 0068 //! returns true if the approximation did come out 0069 //! with a result that is not NECESSARELY within the required tolerance 0070 Standard_EXPORT bool HasResult() const; 0071 0072 //! Returns the greatest distance between a point on the 0073 //! source conic and the BSpline curve resulting from the 0074 //! approximation. (>0 when an approximation 0075 //! has been done, 0 if no approximation) 0076 Standard_EXPORT double MaxError() const; 0077 0078 //! Print on the stream o information about the object 0079 Standard_EXPORT void Dump(Standard_OStream& o) const; 0080 0081 private: 0082 //! Converts a curve to B-spline 0083 Standard_EXPORT void Approximate(const occ::handle<Adaptor2d_Curve2d>& theCurve, 0084 const double theTol3d, 0085 const GeomAbs_Shape theOrder, 0086 const int theMaxSegments, 0087 const int theMaxDegree); 0088 0089 bool myIsDone; 0090 bool myHasResult; 0091 occ::handle<Geom2d_BSplineCurve> myBSplCurve; 0092 double myMaxError; 0093 }; 0094 0095 #endif // _Geom2dConvert_ApproxCurve_HeaderFile
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