Open CASCADE Technology  6.5.4
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Public Member Functions
gce_MakeParab2d Class Reference

This class implements the following algorithms used to
create Parab2d from gp.
Defines an infinite parabola.
An axis placement one axis defines the local cartesian
coordinate system ("XAxis") of the parabola.
The vertex of the parabola is the "Location" point of the
local coordinate system of the parabola.
The "XAxis" of the parabola is its axis of symmetry.
The "XAxis" is oriented from the vertex of the parabola to the
Focus of the parabola.
The "YAxis" is parallel to the directrix of the parabola and
its "Location" point is the vertex of the parabola.
The equation of the parabola in the local coordinate system is
Y**2 = (2*P) * X
P is the distance between the focus and the directrix of the
parabola called Parameter).
The focal length F = P/2 is the distance between the vertex
and the focus of the parabola.

More...

#include <gce_MakeParab2d.hxx>

Inheritance diagram for gce_MakeParab2d:
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Public Member Functions

DEFINE_STANDARD_ALLOC gce_MakeParab2d (const gp_Ax2d &MirrorAxis, const Standard_Real Focal, const Standard_Boolean Sense=Standard_True)
 Creates a parabola with its axis of symmetry ("MirrorAxis")
and its focal length.
Warnings : It is possible to have Focal = 0.
The status is "NullFocalLength" Raised if Focal < 0.0

 gce_MakeParab2d (const gp_Ax22d &A, const Standard_Real Focal)
 Creates a parabola with its local coordinate system
and its focal length.
Warnings : It is possible to have Focal = 0.
The status is "NullFocalLength" Raised if Focal < 0.0

 gce_MakeParab2d (const gp_Ax2d &D, const gp_Pnt2d &F, const Standard_Boolean Sense=Standard_True)
 Creates a parabola with the directrix and the focus point.
The sense of parametrization is given by Sense.

 gce_MakeParab2d (const gp_Ax22d &D, const gp_Pnt2d &F)
 Creates a parabola with the local coordinate system and
the focus point.
The sense of parametrization is given by Sense.

 gce_MakeParab2d (const gp_Pnt2d &S1, const gp_Pnt2d &Center, const Standard_Boolean Sense=Standard_True)
 Make an Parab2d with S1 as the Focal point and Center
as the apex of the parabola
Warning
The MakeParab2d class does not prevent the
construction of a parabola with a null focal distance.
If an error occurs (that is, when IsDone returns
false), the Status function returns:

const gp_Parab2dValue () const
 Returns the constructed parabola.
Exceptions StdFail_NotDone if no parabola is constructed.

const gp_Parab2dOperator () const
 operator gp_Parab2d () const

Detailed Description


Constructor & Destructor Documentation

  • gce_NullFocusLength if Focal is less than 0.0, or
  • gce_NullAxis if S1 and Center are coincident.

Member Function Documentation

gce_MakeParab2d::operator gp_Parab2d ( ) const

The documentation for this class was generated from the following file: