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-- File: Parab2d.cdl
-- Created: Wed Aug 26 14:31:48 1992
-- Author: Remi GILET
-- <reg@topsn3>
---Copyright: Matra Datavision 1992
class MakeParab2d from gce inherits Root from gce
---Purpose :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.
--
-- * Create a Parab2d from one apex and the center.
-- * Create a Parab2d with the directrix and the focus point.
-- * Create a Parab2d with its vertex point and its axis
-- of symetry and its focus length.
uses Pnt2d from gp,
Ax2d from gp,
Ax22d from gp,
Parab2d from gp
raises NotDone from StdFail
is
Create (MirrorAxis : Ax2d from gp ;
Focal : Real from Standard ;
Sense : Boolean from Standard = Standard_True)
returns MakeParab2d;
--- Purpose :
-- 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
Create (A : Ax22d from gp ;
Focal : Real from Standard )
returns MakeParab2d;
--- Purpose :
-- Creates a parabola with its local coordinate system <A>
-- and its focal length.
--- Warnings : It is possible to have Focal = 0.
-- The status is "NullFocalLength" Raised if Focal < 0.0
Create (D : Ax2d from gp ;
F : Pnt2d from gp ;
Sense : Boolean from Standard = Standard_True)
returns MakeParab2d;
--- Purpose :
-- Creates a parabola with the directrix and the focus point.
-- The sense of parametrization is given by Sense.
Create (D : Ax22d from gp ;
F : Pnt2d from gp )
returns MakeParab2d;
--- Purpose :
-- Creates a parabola with the local coordinate system and
-- the focus point.
-- The sense of parametrization is given by Sense.
Create(S1 : Pnt2d from gp ;
Center : Pnt2d from gp ;
Sense : Boolean from Standard = Standard_True) returns MakeParab2d;
---Purpose: 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:
-- - gce_NullFocusLength if Focal is less than 0.0, or
-- - gce_NullAxis if S1 and Center are coincident.
Value(me) returns Parab2d from gp
raises NotDone
is static;
---C++: return const&
---Purpose: Returns the constructed parabola.
-- Exceptions StdFail_NotDone if no parabola is constructed.
Operator(me) returns Parab2d from gp
is static;
---C++: return const&
---C++: alias "Standard_EXPORT operator gp_Parab2d() const;"
fields
TheParab2d : Parab2d from gp;
--The solution from gp.
end MakeParab2d;
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