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167 lines
7.0 KiB
C++
167 lines
7.0 KiB
C++
// Created on: 1994-03-18
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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 _GeomAPI_ExtremaCurveSurface_HeaderFile
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#define _GeomAPI_ExtremaCurveSurface_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_Integer.hxx>
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#include <Extrema_ExtCS.hxx>
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class Standard_OutOfRange;
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class StdFail_NotDone;
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class Geom_Curve;
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class Geom_Surface;
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class gp_Pnt;
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class Extrema_ExtCS;
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//! Describes functions for computing all the extrema
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//! between a curve and a surface.
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//! An ExtremaCurveSurface algorithm minimizes or
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//! maximizes the distance between a point on the curve
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//! and a point on the surface. Thus, it computes start
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//! and end points of perpendiculars common to the
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//! curve and the surface (an intersection point is not an
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//! extremum except where the curve and the surface
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//! are tangential at this point).
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//! Solutions consist of pairs of points, and an extremum
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//! is considered to be a segment joining the two points of a solution.
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//! An ExtremaCurveSurface object provides a framework for:
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//! - defining the construction of the extrema,
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//! - implementing the construction algorithm, and
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//! - consulting the results.
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//! Warning
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//! In some cases, the nearest points between a curve
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//! and a surface do not correspond to one of the
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//! computed extrema. Instead, they may be given by:
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//! - a point of a bounding curve of the surface and one of the following:
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//! - its orthogonal projection on the curve,
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//! - a limit point of the curve; or
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//! - a limit point of the curve and its projection on the surface; or
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//! - an intersection point between the curve and the surface.
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class GeomAPI_ExtremaCurveSurface
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{
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public:
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DEFINE_STANDARD_ALLOC
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//! Constructs an empty algorithm for computing
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//! extrema between a curve and a surface. Use an
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//! Init function to define the curve and the surface on
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//! which it is going to work.
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Standard_EXPORT GeomAPI_ExtremaCurveSurface();
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//! Computes the extrema distances between the
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//! curve <C> and the surface <S>.
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Standard_EXPORT GeomAPI_ExtremaCurveSurface(const Handle(Geom_Curve)& Curve, const Handle(Geom_Surface)& Surface);
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//! Computes the extrema distances between the
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//! curve <C> and the surface <S>. The solution
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//! point are computed in the domain [Wmin,Wmax] of
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//! the curve and in the domain [Umin,Umax]
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//! [Vmin,Vmax] of the surface.
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//! Warning
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//! Use the function NbExtrema to obtain the number
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//! of solutions. If this algorithm fails, NbExtrema returns 0.
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Standard_EXPORT GeomAPI_ExtremaCurveSurface(const Handle(Geom_Curve)& Curve, const Handle(Geom_Surface)& Surface, const Standard_Real Wmin, const Standard_Real Wmax, const Standard_Real Umin, const Standard_Real Umax, const Standard_Real Vmin, const Standard_Real Vmax);
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//! Computes the extrema distances between the
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//! curve <C> and the surface <S>.
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Standard_EXPORT void Init (const Handle(Geom_Curve)& Curve, const Handle(Geom_Surface)& Surface);
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//! Computes the extrema distances between the
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//! curve <C> and the surface <S>. The solution
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//! point are computed in the domain [Wmin,Wmax] of
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//! the curve and in the domain [Umin,Umax]
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//! [Vmin,Vmax] of the surface.
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//! Warning
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//! Use the function NbExtrema to obtain the number
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//! of solutions. If this algorithm fails, NbExtrema returns 0.
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Standard_EXPORT void Init (const Handle(Geom_Curve)& Curve, const Handle(Geom_Surface)& Surface, const Standard_Real Wmin, const Standard_Real Wmax, const Standard_Real Umin, const Standard_Real Umax, const Standard_Real Vmin, const Standard_Real Vmax);
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//! Returns the number of extrema computed by this algorithm.
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//! Note: if this algorithm fails, NbExtrema returns 0.
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Standard_EXPORT Standard_Integer NbExtrema() const;
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Standard_EXPORT operator Standard_Integer() const;
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//! Returns the points P1 on the curve and P2 on the
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//! surface, which are the ends of the extremum of index
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//! Index computed by this algorithm.
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//! Exceptions
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//! Standard_OutOfRange if Index is not in the range [
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//! 1,NbExtrema ], where NbExtrema is the
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//! number of extrema computed by this algorithm.
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Standard_EXPORT void Points (const Standard_Integer Index, gp_Pnt& P1, gp_Pnt& P2) const;
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//! Returns the parameters W of the point on the curve,
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//! and (U,V) of the point on the surface, which are the
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//! ends of the extremum of index Index computed by this algorithm.
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//! Exceptions
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//! Standard_OutOfRange if Index is not in the range [
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//! 1,NbExtrema ], where NbExtrema is the
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//! number of extrema computed by this algorithm.
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Standard_EXPORT void Parameters (const Standard_Integer Index, Standard_Real& W, Standard_Real& U, Standard_Real& V) const;
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//! Computes the distance between the end points of the
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//! extremum of index Index computed by this algorithm.
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//! Exceptions
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//! Standard_OutOfRange if index is not in the range [
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//! 1,NbExtrema ], where NbExtrema is the
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//! number of extrema computed by this algorithm.
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Standard_EXPORT Standard_Real Distance (const Standard_Integer Index) const;
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//! Returns the points PC on the curve and PS on the
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//! surface, which are the ends of the shortest extremum computed by this algorithm.
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//! Exceptions - StdFail_NotDone if this algorithm fails.
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Standard_EXPORT void NearestPoints (gp_Pnt& PC, gp_Pnt& PS) const;
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//! Returns the parameters W of the point on the curve
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//! and (U,V) of the point on the surface, which are the
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//! ends of the shortest extremum computed by this algorithm.
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//! Exceptions - StdFail_NotDone if this algorithm fails.
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Standard_EXPORT void LowerDistanceParameters (Standard_Real& W, Standard_Real& U, Standard_Real& V) const;
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//! Computes the distance between the end points of the
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//! shortest extremum computed by this algorithm.
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//! Exceptions - StdFail_NotDone if this algorithm fails.
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Standard_EXPORT Standard_Real LowerDistance() const;
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Standard_EXPORT operator Standard_Real() const;
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//! Returns the algorithmic object from Extrema
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const Extrema_ExtCS& Extrema() const;
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private:
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Standard_Boolean myIsDone;
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Standard_Integer myIndex;
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Extrema_ExtCS myExtCS;
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};
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#include <GeomAPI_ExtremaCurveSurface.lxx>
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#endif // _GeomAPI_ExtremaCurveSurface_HeaderFile
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