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152 lines
4.6 KiB
C++
152 lines
4.6 KiB
C++
// Created on: 1993-03-24
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// Created by: JCV
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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 _Geom2d_Conic_HeaderFile
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#define _Geom2d_Conic_HeaderFile
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#include <Standard.hxx>
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#include <Standard_Type.hxx>
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#include <gp_Ax22d.hxx>
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#include <Geom2d_Curve.hxx>
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#include <Standard_Real.hxx>
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#include <GeomAbs_Shape.hxx>
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#include <Standard_Boolean.hxx>
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#include <Standard_Integer.hxx>
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class Standard_ConstructionError;
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class Standard_DomainError;
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class gp_Ax22d;
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class gp_Ax2d;
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class gp_Pnt2d;
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class Geom2d_Conic;
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DEFINE_STANDARD_HANDLE(Geom2d_Conic, Geom2d_Curve)
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//! The abstract class Conic describes the common
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//! behavior of conic curves in 2D space and, in
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//! particular, their general characteristics. The Geom2d
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//! package provides four specific classes of conics:
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//! Geom2d_Circle, Geom2d_Ellipse,
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//! Geom2d_Hyperbola and Geom2d_Parabola.
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//! A conic is positioned in the plane with a coordinate
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//! system (gp_Ax22d object), where the origin is the
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//! center of the conic (or the apex in case of a parabola).
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//! This coordinate system is the local coordinate
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//! system of the conic. It gives the conic an explicit
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//! orientation, determining the direction in which the
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//! parameter increases along the conic. The "X Axis" of
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//! the local coordinate system also defines the origin of
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//! the parameter of the conic.
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class Geom2d_Conic : public Geom2d_Curve
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{
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public:
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//! Modifies this conic, redefining its local coordinate system
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//! partially, by assigning P as its origin
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Standard_EXPORT void SetAxis (const gp_Ax22d& A);
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Standard_EXPORT void SetXAxis (const gp_Ax2d& A);
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//! Assigns the origin and unit vector of axis A to the
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//! origin of the local coordinate system of this conic and either:
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//! - its "X Direction", or
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//! - its "Y Direction".
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//! The other unit vector of the local coordinate system
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//! of this conic is recomputed normal to A, without
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//! changing the orientation of the local coordinate
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//! system (right-handed or left-handed).
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Standard_EXPORT void SetYAxis (const gp_Ax2d& A);
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//! Modifies this conic, redefining its local coordinate
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//! system fully, by assigning A as this coordinate system.
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Standard_EXPORT void SetLocation (const gp_Pnt2d& P);
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//! Returns the "XAxis" of the conic.
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//! This axis defines the origin of parametrization of the conic.
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//! This axis and the "Yaxis" define the local coordinate system
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//! of the conic.
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//! -C++: return const&
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Standard_EXPORT gp_Ax2d XAxis() const;
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//! Returns the "YAxis" of the conic.
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//! The "YAxis" is perpendicular to the "Xaxis".
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Standard_EXPORT gp_Ax2d YAxis() const;
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//! returns the eccentricity value of the conic e.
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//! e = 0 for a circle
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//! 0 < e < 1 for an ellipse (e = 0 if MajorRadius = MinorRadius)
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//! e > 1 for a hyperbola
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//! e = 1 for a parabola
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Standard_EXPORT virtual Standard_Real Eccentricity() const = 0;
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//! Returns the location point of the conic.
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//! For the circle, the ellipse and the hyperbola it is the center of
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//! the conic. For the parabola it is the vertex of the parabola.
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Standard_EXPORT gp_Pnt2d Location() const;
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//! Returns the local coordinates system of the conic.
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Standard_EXPORT const gp_Ax22d& Position() const;
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//! Reverses the direction of parameterization of <me>.
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//! The local coordinate system of the conic is modified.
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Standard_EXPORT void Reverse() Standard_OVERRIDE;
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//! Returns the parameter on the reversed curve for
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//! the point of parameter U on <me>.
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Standard_EXPORT virtual Standard_Real ReversedParameter (const Standard_Real U) const Standard_OVERRIDE = 0;
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//! Returns GeomAbs_CN which is the global continuity of any conic.
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Standard_EXPORT GeomAbs_Shape Continuity() const Standard_OVERRIDE;
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//! Returns True, the order of continuity of a conic is infinite.
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Standard_EXPORT Standard_Boolean IsCN (const Standard_Integer N) const Standard_OVERRIDE;
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DEFINE_STANDARD_RTTIEXT(Geom2d_Conic,Geom2d_Curve)
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protected:
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gp_Ax22d pos;
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private:
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};
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#endif // _Geom2d_Conic_HeaderFile
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