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110 lines
3.9 KiB
C++
110 lines
3.9 KiB
C++
// Created on: 1993-09-07
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// Created by: Bruno DUMORTIER
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// Copyright (c) 1993-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _ProjLib_ComputeApprox_HeaderFile
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#define _ProjLib_ComputeApprox_HeaderFile
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#include <Adaptor3d_Curve.hxx>
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#include <Adaptor3d_Surface.hxx>
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#include <AppParCurves_Constraint.hxx>
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class Geom2d_BSplineCurve;
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class Geom2d_BezierCurve;
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//! Approximate the projection of a 3d curve on an
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//! analytic surface and stores the result in Approx.
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//! The result is a 2d curve.
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//! For approximation some parameters are used, including
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//! required tolerance of approximation.
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//! Tolerance is maximal possible value of 3d deviation of 3d projection of projected curve from
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//! "exact" 3d projection. Since algorithm searches 2d curve on surface, required 2d tolerance is computed
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//! from 3d tolerance with help of U,V resolutions of surface.
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//! 3d and 2d tolerances have sense only for curves on surface, it defines precision of projecting and approximation
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//! and have nothing to do with distance between the projected curve and the surface.
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class ProjLib_ComputeApprox
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{
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public:
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DEFINE_STANDARD_ALLOC
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//! Empty constructor, it only sets some initial values for class fields.
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Standard_EXPORT ProjLib_ComputeApprox();
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//! <Tol> is the tolerance with which the
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//! approximation is performed.
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//! Other parameters for approximation have default values.
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Standard_EXPORT ProjLib_ComputeApprox(const Handle(Adaptor3d_Curve)& C, const Handle(Adaptor3d_Surface)& S, const Standard_Real Tol);
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//! Performs projecting.
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//! In case of approximation current values of parameters are used:
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//! default values or set by corresponding methods Set...
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Standard_EXPORT void Perform(const Handle(Adaptor3d_Curve)& C, const Handle(Adaptor3d_Surface)& S);
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//! Set tolerance of approximation.
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//! Default value is Precision::Confusion().
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Standard_EXPORT void SetTolerance(const Standard_Real theTolerance);
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//! Set min and max possible degree of result BSpline curve2d, which is got by approximation.
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//! If theDegMin/Max < 0, algorithm uses values that are chosen depending of types curve 3d
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//! and surface.
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Standard_EXPORT void SetDegree(const Standard_Integer theDegMin, const Standard_Integer theDegMax);
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//! Set the parameter, which defines maximal value of parametric intervals the projected
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//! curve can be cut for approximation. If theMaxSegments < 0, algorithm uses default
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//! value = 1000.
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Standard_EXPORT void SetMaxSegments(const Standard_Integer theMaxSegments);
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//! Set the parameter, which defines type of boundary condition between segments during approximation.
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//! It can be AppParCurves_PassPoint or AppParCurves_TangencyPoint.
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//! Default value is AppParCurves_TangencyPoint;
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Standard_EXPORT void SetBndPnt(const AppParCurves_Constraint theBndPnt);
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Standard_EXPORT Handle(Geom2d_BSplineCurve) BSpline() const;
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Standard_EXPORT Handle(Geom2d_BezierCurve) Bezier() const;
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//! returns the reached Tolerance.
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Standard_EXPORT Standard_Real Tolerance() const;
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protected:
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private:
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Standard_Real myTolerance;
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Handle(Geom2d_BSplineCurve) myBSpline;
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Handle(Geom2d_BezierCurve) myBezier;
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Standard_Integer myDegMin;
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Standard_Integer myDegMax;
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Standard_Integer myMaxSegments;
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AppParCurves_Constraint myBndPnt;
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};
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#endif // _ProjLib_ComputeApprox_HeaderFile
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