include/opencascade/GeomConvert_ApproxSurface.hxx

0001 // Created on: 1997-08-26
0002 // Created by: Stepan MISHIN
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 _GeomConvert_ApproxSurface_HeaderFile
0018 #define _GeomConvert_ApproxSurface_HeaderFile
0019
0020 #include <Adaptor3d_Surface.hxx>
0021 #include <GeomAbs_Shape.hxx>
0022 #include <Standard_OStream.hxx>
0023
0024 class Geom_BSplineSurface;
0025 class Geom_Surface;
0026
0027 //! A framework to convert a surface to a BSpline
0028 //! surface. This is done by approximation to a BSpline
0029 //! surface within a given tolerance.
0030 class GeomConvert_ApproxSurface
0031 {
0032 public:
0033
0034   DEFINE_STANDARD_ALLOC
0035
0036
0037   //! Constructs a surface approximation framework defined by
0038   //! -   the conic Surf
0039   //! -   the tolerance value Tol3d
0040   //! -   the degree of continuity UContinuity, VContinuity
0041   //! in the directions of the U and V parameters
0042   //! -   the highest degree MaxDegU, MaxDegV which
0043   //! the polynomial defining the BSpline curve may
0044   //! have in the directions of the U and V parameters
0045   //! -   the maximum number of segments MaxSegments
0046   //! allowed in the resulting BSpline curve
0047   //! -   the index of precision PrecisCode.
0048   Standard_EXPORT GeomConvert_ApproxSurface(const Handle(Geom_Surface)& Surf, const Standard_Real Tol3d, const GeomAbs_Shape UContinuity, const GeomAbs_Shape VContinuity, const Standard_Integer MaxDegU, const Standard_Integer MaxDegV, const Standard_Integer MaxSegments, const Standard_Integer PrecisCode);
0049
0050   //! Constructs a surface approximation framework defined by
0051   //! -   the Surf
0052   //! -   the tolerance value Tol3d
0053   //! -   the degree of continuity UContinuity, VContinuity
0054   //! in the directions of the U and V parameters
0055   //! -   the highest degree MaxDegU, MaxDegV which
0056   //! the polynomial defining the BSpline curve may
0057   //! have in the directions of the U and V parameters
0058   //! -   the maximum number of segments MaxSegments
0059   //! allowed in the resulting BSpline curve
0060   //! -   the index of precision PrecisCode.
0061   Standard_EXPORT GeomConvert_ApproxSurface(const Handle(Adaptor3d_Surface)& Surf, const Standard_Real Tol3d, const GeomAbs_Shape UContinuity, const GeomAbs_Shape VContinuity, const Standard_Integer MaxDegU, const Standard_Integer MaxDegV, const Standard_Integer MaxSegments, const Standard_Integer PrecisCode);
0062
0063   //! Returns the BSpline surface resulting from the approximation algorithm.
0064   Standard_EXPORT Handle(Geom_BSplineSurface) Surface() const;
0065
0066   //! Returns Standard_True if the approximation has be done
0067   Standard_EXPORT Standard_Boolean IsDone() const;
0068
0069   //! Returns true if the approximation did come out with a result that
0070   //! is not NECESSARILY within the required tolerance or a result
0071   //! that is not recognized with the wished continuities.
0072   Standard_EXPORT Standard_Boolean HasResult() const;
0073
0074   //! Returns the greatest distance between a point on the
0075   //! source conic surface and the BSpline surface
0076   //! resulting from the approximation (>0 when an approximation
0077   //! has been done, 0 if no  approximation )
0078   Standard_EXPORT Standard_Real MaxError() const;
0079
0080   //! Prints on the stream o information on the current state of the object.
0081   Standard_EXPORT void Dump (Standard_OStream& o) const;
0082
0083
0084
0085
0086 protected:
0087
0088
0089
0090
0091
0092 private:
0093
0094
0095   //! Converts a surface to B-spline
0096   Standard_EXPORT void Approximate (const Handle(Adaptor3d_Surface)& theSurf, const Standard_Real theTol3d, const GeomAbs_Shape theUContinuity, const GeomAbs_Shape theVContinuity, const Standard_Integer theMaxDegU, const Standard_Integer theMaxDegV, const Standard_Integer theMaxSegments, const Standard_Integer thePrecisCode);
0097
0098
0099   Standard_Boolean myIsDone;
0100   Standard_Boolean myHasResult;
0101   Handle(Geom_BSplineSurface) myBSplSurf;
0102   Standard_Real myMaxError;
0103
0104
0105 };
0106
0107
0108
0109
0110
0111
0112
0113 #endif // _GeomConvert_ApproxSurface_HeaderFile