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Approximation parameters: degmin, degmax, max number of segments, boundary condition, maximal distance of projecting are added in interface of classes ProjLib_ProjectedCurve, ProjLib_ComputeApprox, ProjLib_ComputeApproxOnPolarSurface Algorithm of Approx/Approx_ComputeCLine is modified in order to treat maximal number of segments allowed for cutting. Algorithm of method BOPTools_AlgoTools2D::MakePCurveOnFace(...) is modified in order to manage cases with big edge tolerances. Test case added Some test cases were modified according to new behavior of algorithms
156 lines
6.6 KiB
C++
156 lines
6.6 KiB
C++
// Created on: 1994-10-07
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// Created by: Bruno DUMORTIER
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// Copyright (c) 1994-1999 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_ComputeApproxOnPolarSurface_HeaderFile
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#define _ProjLib_ComputeApproxOnPolarSurface_HeaderFile
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#include <Standard.hxx>
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#include <Standard_DefineAlloc.hxx>
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#include <Standard_Handle.hxx>
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#include <Standard_Boolean.hxx>
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#include <Standard_Real.hxx>
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#include <AppParCurves_Constraint.hxx>
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class Geom2d_BSplineCurve;
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class Geom2d_Curve;
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class Adaptor3d_HCurve;
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class Adaptor3d_HSurface;
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class Adaptor2d_HCurve2d;
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//! Approximate the projection of a 3d curve on an
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//! polar surface and stores the result in Approx.
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//! The result is a 2d curve. The evaluation of the
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//! current point of the 2d curve is done with the
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//! evaluation of the extrema P3d - Surface.
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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 sence 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_ComputeApproxOnPolarSurface
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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_ComputeApproxOnPolarSurface();
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//! Constructor, which performs projecting.
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Standard_EXPORT ProjLib_ComputeApproxOnPolarSurface(const Handle(Adaptor3d_HCurve)& C, const Handle(Adaptor3d_HSurface)& S, const Standard_Real Tol = 1.0e-4);
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//! Constructor, which performs projecting, using initial curve 2d InitCurve2d, which is any rough approximation of result curve.
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//! Parameter Tol is 3d tolerance of approximation.
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Standard_EXPORT ProjLib_ComputeApproxOnPolarSurface(const Handle(Adaptor2d_HCurve2d)& InitCurve2d, const Handle(Adaptor3d_HCurve)& C, const Handle(Adaptor3d_HSurface)& S, const Standard_Real Tol);
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//! Constructor, which performs projecting, using two initial curves 2d: InitCurve2d and InitCurve2dBis that are any rough approximations of result curves.
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//! This constructor is used to get two pcurves for seem edge.
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//! Parameter Tol is 3d tolerance of approximation.
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Standard_EXPORT ProjLib_ComputeApproxOnPolarSurface(const Handle(Adaptor2d_HCurve2d)& InitCurve2d, const Handle(Adaptor2d_HCurve2d)& InitCurve2dBis, const Handle(Adaptor3d_HCurve)& C,
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const Handle(Adaptor3d_HSurface)& S, const Standard_Real Tol);
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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 min = 2, max = 8.
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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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//! Set the parameter, which defines maximal possible distance between projected curve and surface.
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//! It is used only for projecting on not analytical surfaces.
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//! If theMaxDist < 0, algoritm uses default value 100.*Tolerance.
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//! If real distance between curve and surface more then theMaxDist, algorithm stops working.
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Standard_EXPORT void SetMaxDist(const Standard_Real theMaxDist);
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//! Set the tolerance used to project
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//! the curve on the surface.
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//! Default value is Precision::Approximation().
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Standard_EXPORT void SetTolerance (const Standard_Real theTolerance);
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//! Method, which performs projecting, using default values of parameters or
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//! they must be set by corresponding methods before using.
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Standard_EXPORT void Perform (const Handle(Adaptor3d_HCurve)& C, const Handle(Adaptor3d_HSurface)& S);
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//! Method, which performs projecting, using default values of parameters or
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//! they must be set by corresponding methods before using.
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//! Parameter InitCurve2d is any rough estimation of 2d result curve.
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Standard_EXPORT Handle(Geom2d_BSplineCurve) Perform (const Handle(Adaptor2d_HCurve2d)& InitCurve2d, const Handle(Adaptor3d_HCurve)& C, const Handle(Adaptor3d_HSurface)& S);
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//! Builds initial 2d curve as BSpline with degree = 1 using Extrema algoritm.
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//! Method is used in method Perform(...).
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Standard_EXPORT Handle(Adaptor2d_HCurve2d) BuildInitialCurve2d (const Handle(Adaptor3d_HCurve)& Curve, const Handle(Adaptor3d_HSurface)& S);
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//! Method, which performs projecting.
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//! Method is used in method Perform(...).
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Standard_EXPORT Handle(Geom2d_BSplineCurve) ProjectUsingInitialCurve2d (const Handle(Adaptor3d_HCurve)& Curve, const Handle(Adaptor3d_HSurface)& S, const Handle(Adaptor2d_HCurve2d)& InitCurve2d);
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//! Returns result curve 2d.
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Standard_EXPORT Handle(Geom2d_BSplineCurve) BSpline() const;
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//! Returns second 2d curve.
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Standard_EXPORT Handle(Geom2d_Curve) Curve2d() const;
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Standard_EXPORT Standard_Boolean IsDone() 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_Boolean myProjIsDone;
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Standard_Real myTolerance;
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Handle(Geom2d_BSplineCurve) myBSpline;
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Handle(Geom2d_Curve) my2ndCurve;
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Standard_Real myTolReached;
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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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Standard_Real myMaxDist;
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AppParCurves_Constraint myBndPnt;
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};
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#endif // _ProjLib_ComputeApproxOnPolarSurface_HeaderFile
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