include/opencascade/IGESConvGeom.hxx

0001 // Created on: 1994-09-01
0002 // Created by: Christian CAILLET
0003 // Copyright (c) 1994-1999 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 _IGESConvGeom_HeaderFile
0018 #define _IGESConvGeom_HeaderFile
0019
0020 #include <Standard.hxx>
0021 #include <Standard_DefineAlloc.hxx>
0022 #include <Standard_Handle.hxx>
0023
0024 #include <Standard_Integer.hxx>
0025 #include <Standard_Real.hxx>
0026 class IGESGeom_SplineCurve;
0027 class Geom_BSplineCurve;
0028 class Geom2d_BSplineCurve;
0029 class IGESGeom_SplineSurface;
0030 class Geom_BSplineSurface;
0031
0032 //! This package is intended to gather geometric conversion which
0033 //! are not immediate but can be used for several purposes :
0034 //! mainly, standard conversion to and from CasCade geometric and
0035 //! topologic data, and adaptations of IGES files as required
0036 //! (as replacing Spline entities to BSpline equivalents).
0037 class IGESConvGeom
0038 {
0039 public:
0040   DEFINE_STANDARD_ALLOC
0041
0042   //! basic tool to build curves from IGESGeom (arrays of points,
0043   //! Transformations, evaluation of points in a datum)
0044   //! Converts a SplineCurve from IGES to a BSplineCurve from CasCade
0045   //! <epscoef> gives tolerance to consider coefficient to be nul
0046   //! <epsgeom> gives tolerance to consider poles to be equal
0047   //! The returned value is a status with these possible values :
0048   //! - 0  OK, done
0049   //! - 1  the result is not guaranteed to be C0 (with <epsgeom>)
0050   //! - 2  SplineType not processed (allowed : max 3)
0051   //! (no result produced)
0052   //! - 3  error during creation of control points
0053   //! (no result produced)
0054   //! - 4  polynomial equation is not correct (no result produced)
0055   //! - 5  less than one segment (no result produced)
0056   Standard_EXPORT static int SplineCurveFromIGES(const occ::handle<IGESGeom_SplineCurve>& igesent,
0057                                                  const double                             epscoef,
0058                                                  const double                             epsgeom,
0059                                                  occ::handle<Geom_BSplineCurve>&          result);
0060
0061   //! Tries to increase curve continuity with tolerance <epsgeom>
0062   //! <continuity> is the new desired continuity, can be 1 or 2
0063   //! (more than 2 is considered as 2).
0064   //! Returns the new maximum continuity obtained on all knots.
0065   //! Remark that, for instance with <continuity> = 2, even if not
0066   //! all the knots can be passed to C2, all knots which can be are.
0067   Standard_EXPORT static int IncreaseCurveContinuity(const occ::handle<Geom_BSplineCurve>& curve,
0068                                                      const double                          epsgeom,
0069                                                      const int continuity = 2);
0070
0071   Standard_EXPORT static int IncreaseCurveContinuity(const occ::handle<Geom2d_BSplineCurve>& curve,
0072                                                      const double epsgeom,
0073                                                      const int    continuity = 2);
0074
0075   //! Converts a SplineSurface from IGES to a BSplineSurface from CasCade
0076   //! <epscoef> gives tolerance to consider coefficient to be nul
0077   //! <epsgeom> gives tolerance to consider poles to be equal
0078   //! The returned value is a status with these possible values :
0079   //! - 0  OK, done
0080   //! - 1  the result is not guaranteed to be C0 (with <epsgeom>)
0081   //! - 2  degree is not compatible with code boundary type
0082   //! (warning) but C0 is OK
0083   //! - 3  idem but C0 is not guaranteed (warning)
0084   //! - 4  degree has been determined to be nul, either in U or V
0085   //! (no result produced)
0086   //! - 5  less than one segment in U or V (no result produced)
0087   Standard_EXPORT static int SplineSurfaceFromIGES(
0088     const occ::handle<IGESGeom_SplineSurface>& igesent,
0089     const double                               epscoef,
0090     const double                               epsgeom,
0091     occ::handle<Geom_BSplineSurface>&          result);
0092
0093   //! Tries to increase Surface continuity with tolerance <epsgeom>
0094   //! <continuity> is the new desired continuity, can be 1 or 2
0095   //! (more than 2 is considered as 2).
0096   //! Returns the new maximum continuity obtained on all knots.
0097   //! Remark that, for instance with <continuity> = 2, even if not
0098   //! all the knots can be passed to C2, all knots which can be are.
0099   Standard_EXPORT static int IncreaseSurfaceContinuity(
0100     const occ::handle<Geom_BSplineSurface>& surface,
0101     const double                            epsgeom,
0102     const int                               continuity = 2);
0103 };
0104
0105 #endif // _IGESConvGeom_HeaderFile