gce_MakeParab Class Reference

This class implements the following algorithms used to
create Parab from gp.
Defines the parabola in the parameterization range :
]-infinite, +infinite[
The vertex of the parabola is the "Location" point of the
local coordinate system (axis placement) of the parabola.

The "XDirection" and the "YDirection" of this system define
the plane of the parabola.

The "XAxis" of the parabola ("Location", "XDirection") is
the axis of symmetry of the parabola. The Xaxis is oriented
from the vertex of the parabola to the Focus of the parabola.

The "YAxis" of the parabola ("Location", "YDirection") is
parallel to the directrix of the parabola.

The equation of the parabola in the local coordinates 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_MakeParab.hxx>

Inheritance diagram for gce_MakeParab:

Public Member Functions
	gce_MakeParab (const gp_Ax2 &A2, const Standard_Real Focal)
	— Purpose ; Creates a parabola with its local coordinate system "A2" and it's focal length "Focal". The XDirection of A2 defines the axis of symmetry of the parabola. The YDirection of A2 is parallel to the directrix of the parabola. The Location point of A2 is the vertex of the parabola The status is "NullFocusLength" if Focal < 0.0 More...
	gce_MakeParab (const gp_Ax1 &D, const gp_Pnt &F)
	D is the directrix of the parabola and F the focus point. The symmetry axis (XAxis) of the parabola is normal to the directrix and pass through the focus point F, but its location point is the vertex of the parabola. The YAxis of the parabola is parallel to D and its location point is the vertex of the parabola. The normal to the plane of the parabola is the cross product between the XAxis and the YAxis. More...
const gp_Parab &	Value () const
	Returns the constructed parabola. <br> Exceptions StdFail_NotDone if no parabola is constructed. More...
const gp_Parab &	Operator () const
	operator gp_Parab () const
Public Member Functions inherited from gce_Root
Standard_Boolean	IsDone () const
	Returns true if the construction is successful. More...
gce_ErrorType	Status () const
	Returns the status of the construction: More...

Additional Inherited Members
Protected Attributes inherited from gce_Root
gce_ErrorType	TheError

Detailed Description

This class implements the following algorithms used to
create Parab from gp.
Defines the parabola in the parameterization range :
]-infinite, +infinite[
The vertex of the parabola is the "Location" point of the
local coordinate system (axis placement) of the parabola.

The "XDirection" and the "YDirection" of this system define
the plane of the parabola.

The "XAxis" of the parabola ("Location", "XDirection") is
the axis of symmetry of the parabola. The Xaxis is oriented
from the vertex of the parabola to the Focus of the parabola.

The "YAxis" of the parabola ("Location", "YDirection") is
parallel to the directrix of the parabola.

The equation of the parabola in the local coordinates 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.

• Creates a parabola with its local coordinate system "A2"
  and it's focal length "Focal".
  
• Create a parabola with its directrix and its focus point.
  

Constructor & Destructor Documentation

gce_MakeParab::gce_MakeParab	(	const gp_Ax2 &	A2,
		const Standard_Real	Focal
	)

— Purpose ;
Creates a parabola with its local coordinate system "A2"
and it's focal length "Focal".
The XDirection of A2 defines the axis of symmetry of the
parabola. The YDirection of A2 is parallel to the directrix
of the parabola. The Location point of A2 is the vertex of
the parabola
The status is "NullFocusLength" if Focal < 0.0

gce_MakeParab::gce_MakeParab	(	const gp_Ax1 &	D,
		const gp_Pnt &	F
	)

D is the directrix of the parabola and F the focus point.
The symmetry axis (XAxis) of the parabola is normal to the
directrix and pass through the focus point F, but its
location point is the vertex of the parabola.
The YAxis of the parabola is parallel to D and its location
point is the vertex of the parabola. The normal to the plane
of the parabola is the cross product between the XAxis and the
YAxis.

Member Function Documentation

const gp_Parab& gce_MakeParab::Operator

(

)

const

gce_MakeParab::operator gp_Parab

(

)

const

const gp_Parab& gce_MakeParab::Value

(

)

const

 Returns the constructed parabola. <br>

Exceptions StdFail_NotDone if no parabola is constructed.

---

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

• gce_MakeParab.hxx