Open CASCADE Technology
7.1.0.beta

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. More...
#include <gce_MakeParab.hxx>
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. 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 
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.
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
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.
const gp_Parab& gce_MakeParab::Operator  (  )  const 
gce_MakeParab::operator gp_Parab  (  )  const 
const gp_Parab& gce_MakeParab::Value  (  )  const 
Returns the constructed parabola. Exceptions StdFail_NotDone if no parabola is constructed.