GCE2d_MakeParabola Class Reference

This class implements the following algorithms used to create Parabola from Geom2d. More...

#include <GCE2d_MakeParabola.hxx>

Inheritance diagram for GCE2d_MakeParabola:

Public Member Functions
	GCE2d_MakeParabola (const gp_Parab2d &Prb)
	Creates a parabola from a non persistent one.
	GCE2d_MakeParabola (const gp_Ax22d &Axis, const Standard_Real Focal)
	Creates a parabola with its local coordinate system and it's focal length "Focal". The "Location" point of "Axis" is the vertex of the parabola Status is "NegativeFocusLength" if Focal < 0.0.
	GCE2d_MakeParabola (const gp_Ax2d &MirrorAxis, const Standard_Real Focal, const Standard_Boolean Sense)
	Creates a parabola with its "MirrorAxis" and it's focal length "Focal". MirrorAxis is the axis of symmetry of the curve, it is the "XAxis". The "YAxis" is parallel to the directrix of the parabola. The "Location" point of "MirrorAxis" is the vertex of the parabola Status is "NegativeFocusLength" if Focal < 0.0.
	GCE2d_MakeParabola (const gp_Ax2d &D, const gp_Pnt2d &F, const Standard_Boolean Sense=Standard_True)
	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.
	GCE2d_MakeParabola (const gp_Pnt2d &S1, const gp_Pnt2d &O)
	Make a parabola with focal point S1 and center O The branch of the parabola returned will have <S1> as focal point The implicit orientation of the parabola is:
const Handle< Geom2d_Parabola > &	Value () const
	Returns the constructed parabola. Exceptions StdFail_NotDone if no parabola is constructed.
	operator const Handle< Geom2d_Parabola > & () const
Public Member Functions inherited from GCE2d_Root
Standard_Boolean	IsDone () const
	Returns true if the construction is successful.
gce_ErrorType	Status () const
	Returns the status of the construction.

Additional Inherited Members
Protected Attributes inherited from GCE2d_Root
gce_ErrorType	TheError

Detailed Description

This class implements the following algorithms used to create Parabola from Geom2d.

• Create an Parabola from two apex and the center. Defines the parabola in the parameterization range : ]-infinite,+infinite[ The vertex of the parabola is the "Location" point of the local coordinate system "XAxis" 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 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.

Constructor & Destructor Documentation

GCE2d_MakeParabola() [1/5]

GCE2d_MakeParabola::GCE2d_MakeParabola

(

const gp_Parab2d &

Prb

)

Creates a parabola from a non persistent one.

GCE2d_MakeParabola() [2/5]

GCE2d_MakeParabola::GCE2d_MakeParabola	(	const gp_Ax22d &	Axis,
		const Standard_Real	Focal )

Creates a parabola with its local coordinate system and it's focal length "Focal". The "Location" point of "Axis" is the vertex of the parabola Status is "NegativeFocusLength" if Focal < 0.0.

GCE2d_MakeParabola() [3/5]

GCE2d_MakeParabola::GCE2d_MakeParabola	(	const gp_Ax2d &	MirrorAxis,
		const Standard_Real	Focal,
		const Standard_Boolean	Sense )

Creates a parabola with its "MirrorAxis" and it's focal length "Focal". MirrorAxis is the axis of symmetry of the curve, it is the "XAxis". The "YAxis" is parallel to the directrix of the parabola. The "Location" point of "MirrorAxis" is the vertex of the parabola Status is "NegativeFocusLength" if Focal < 0.0.

GCE2d_MakeParabola() [4/5]

GCE2d_MakeParabola::GCE2d_MakeParabola	(	const gp_Ax2d &	D,
		const gp_Pnt2d &	F,
		const Standard_Boolean	Sense = Standard_True )

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.

GCE2d_MakeParabola() [5/5]

GCE2d_MakeParabola::GCE2d_MakeParabola	(	const gp_Pnt2d &	S1,
		const gp_Pnt2d &	O )

Make a parabola with focal point S1 and center O The branch of the parabola returned will have <S1> as focal point The implicit orientation of the parabola is:

• the same one as the parabola Prb,
• the sense defined by the coordinate system Axis or the directrix D,
• the trigonometric sense if Sense is not given or is true, or
• the opposite sense if Sense is false. Warning The MakeParabola 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:
• gce_NullFocusLength if Focal is less than 0.0, or
• gce_NullAxis if points S1 and O are coincident.

Member Function Documentation

operator const Handle< Geom2d_Parabola > &()

GCE2d_MakeParabola::operator const Handle< Geom2d_Parabola > & ( ) const

inline

Value()

const Handle< Geom2d_Parabola > & GCE2d_MakeParabola::Value

(

)

const

Returns the constructed parabola. Exceptions StdFail_NotDone if no parabola is constructed.

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

• GCE2d_MakeParabola.hxx