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