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6e33d3ced2
Redundant keyword 'mutable' removed in CDL files. In IGESConvGeom_GeomBuilder, unused methods MakeXY() and MakeXYZ() removed. Method StepAP214_AutoDesignGroupAssignment::Init() replicating same method of the base class is removed as it causes CDL extraction error after above (seemingly irrelevant) changes.
233 lines
8.5 KiB
Plaintext
233 lines
8.5 KiB
Plaintext
-- Created on: 1993-03-24
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-- Created by: JCV
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-- Copyright (c) 1993-1999 Matra Datavision
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-- Copyright (c) 1999-2014 OPEN CASCADE SAS
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--
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-- This file is part of Open CASCADE Technology software library.
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--
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-- This library is free software; you can redistribute it and/or modify it under
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-- the terms of the GNU Lesser General Public License version 2.1 as published
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-- by the Free Software Foundation, with special exception defined in the file
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-- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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-- distribution for complete text of the license and disclaimer of any warranty.
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--
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-- Alternatively, this file may be used under the terms of Open CASCADE
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-- commercial license or contractual agreement.
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class Parabola from Geom2d inherits Conic from Geom2d
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--- Purpose : Describes a parabola in the plane (2D space).
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-- A parabola is defined by its focal length (i.e. the
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-- distance between its focus and its apex) and is
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-- positioned in the plane with a coordinate system
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-- (gp_Ax22d object) where:
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-- - the origin is the apex of the parabola, and
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-- - the "X Axis" defines the axis of symmetry; the
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-- parabola is on the positive side of this axis.
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-- This coordinate system is the local coordinate
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-- system of the parabola.
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-- The orientation (direct or indirect) of the local
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-- coordinate system gives an explicit orientation to the
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-- parabola, determining the direction in which the
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-- parameter increases along the parabola.
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-- The Geom_Parabola parabola is parameterized as follows:
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-- P(U) = O + U*U/(4.*F)*XDir + U*YDir, where:
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-- - P is the point of parameter U,
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-- - O, XDir and YDir are respectively the origin, "X
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-- Direction" and "Y Direction" of its local coordinate system,
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-- - F is the focal length of the parabola.
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-- The parameter of the parabola is therefore its Y
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-- coordinate in the local coordinate system, with the "X
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-- Axis" of the local coordinate system defining the
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-- origin of the parameter.
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-- The parameter range is ] -infinite,+infinite [.
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uses Ax2d from gp,
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Ax22d from gp,
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Parab2d from gp,
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Pnt2d from gp,
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Trsf2d from gp,
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Vec2d from gp,
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Geometry from Geom2d
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raises ConstructionError from Standard,
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RangeError from Standard
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is
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Create (Prb : Parab2d) returns Parabola;
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--- Purpose : Creates a parabola from a non persistent one.
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Create (MirrorAxis : Ax2d; Focal : Real;
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Sense: Boolean from Standard = Standard_True)
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returns Parabola
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--- Purpose :
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-- Creates a parabola with its "MirrorAxis" and it's focal
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-- length "Focal".
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-- MirrorAxis is the axis of symmetry of the curve, it is the
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-- "XAxis". The "YAxis" is parallel to the directrix of the
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-- parabola and is in the direct sense if Sense is True.
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-- The "Location" point of "MirrorAxis" is the vertex of the parabola
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raises ConstructionError;
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--- Purpose : Raised if Focal < 0.0
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Create (Axis : Ax22d; Focal : Real) returns Parabola
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--- Purpose :
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-- Creates a parabola with its Axis and it's focal
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-- length "Focal".
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-- The XDirection of Axis is the axis of symmetry of the curve,
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-- it is the "XAxis". The "YAxis" is parallel to the directrix of the
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-- parabola. The "Location" point of "Axis" is the vertex
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-- of the parabola.
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raises ConstructionError;
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--- Purpose : Raised if Focal < 0.0
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Create (D : Ax2d; F : Pnt2d) returns Parabola;
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--- Purpose :
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-- D is the directrix of the parabola and F the focus point.
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-- The symmetry axis "XAxis" of the parabola is normal to the
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-- directrix and pass through the focus point F, but its
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-- "Location" point is the vertex of the parabola.
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-- The "YAxis" of the parabola is parallel to D and its "Location"
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-- point is the vertex of the parabola.
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SetFocal (me : mutable; Focal : Real)
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--- Purpose : Assigns the value Focal to the focal length of this parabola.
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-- Exceptions Standard_ConstructionError if Focal is negative.
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raises ConstructionError;
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SetParab2d (me : mutable; Prb : Parab2d);
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--- Purpose: Converts the gp_Parab2d parabola Prb into this parabola.
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Parab2d (me) returns Parab2d;
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--- Purpose :
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-- Returns the non persistent parabola from gp with the same
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-- geometric properties as <me>.
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ReversedParameter(me; U : Real) returns Real is redefined static;
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---Purpose: Computes the parameter on the reversed parabola
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-- for the point of parameter U on this parabola.
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-- For a parabola, the returned value is -U.
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FirstParameter (me) returns Real is redefined static;
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--- Purpose : Returns RealFirst from Standard.
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LastParameter (me) returns Real is redefined static;
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--- Purpose : Returns RealLast from Standard.
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IsClosed (me) returns Boolean is redefined static;
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--- Purpose : Returns False
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IsPeriodic (me) returns Boolean is redefined static;
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--- Purpose : Returns False
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Directrix (me) returns Ax2d;
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--- Purpose : The directrix is parallel to the "YAxis" of the parabola.
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-- The "Location" point of the directrix is the intersection
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-- point between the directrix and the symmetry axis ("XAxis") of the parabola.
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Eccentricity (me) returns Real is redefined static;
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--- Purpose : Returns the eccentricity e = 1.0
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Focus (me) returns Pnt2d;
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---Purpose: Computes the focus of this parabola The focus is on the
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-- positive side of the "X Axis" of the local coordinate system of the parabola.
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Focal (me) returns Real;
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--- Purpose : Computes the focal length of this parabola.
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-- The focal length is the distance between the apex and the focus of the parabola.
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Parameter (me) returns Real;
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--- Purpose : Computes the parameter of this parabola, which is
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-- the distance between its focus and its directrix. This
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-- distance is twice the focal length.
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-- If P is the parameter of the parabola, the equation of
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-- the parabola in its local coordinate system is: Y**2 = 2.*P*X.
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D0(me; U : Real; P : out Pnt2d) is redefined static;
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---Purpose: Returns in P the point of parameter U.
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-- If U = 0 the returned point is the origin of the XAxis and
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-- the YAxis of the parabola and it is the vertex of the parabola.
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-- P = S + F * (U * U * XDir + * U * YDir)
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-- where S is the vertex of the parabola, XDir the XDirection and
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-- YDir the YDirection of the parabola's local coordinate system.
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D1 (me; U : Real; P : out Pnt2d; V1 : out Vec2d) is redefined static;
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--- Purpose :
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-- Returns the point P of parameter U and the first derivative V1.
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D2 (me; U : Real; P : out Pnt2d; V1, V2 : out Vec2d) is redefined static;
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--- Purpose :
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-- Returns the point P of parameter U, the first and second
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-- derivatives V1 and V2.
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D3 (me; U : Real; P : out Pnt2d; V1, V2, V3 : out Vec2d) is redefined static;
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--- Purpose :
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-- Returns the point P of parameter U, the first second and third
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-- derivatives V1 V2 and V3.
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DN (me; U : Real; N : Integer) returns Vec2d
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--- Purpose : For the point of parameter U of this parabola,
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-- computes the vector corresponding to the Nth derivative.
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-- Exceptions Standard_RangeError if N is less than 1.
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raises RangeError
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is redefined static;
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Transform (me : mutable; T : Trsf2d) is redefined static;
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---Purpose: Applies the transformation T to this parabola.
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TransformedParameter(me; U : Real; T : Trsf2d from gp) returns Real
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---Purpose: Computes the parameter on the transformed
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-- parabola, for the point of parameter U on this parabola.
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-- For a parabola, the returned value is equal to U
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-- multiplied by the scale factor of transformation T.
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is redefined static;
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ParametricTransformation(me; T : Trsf2d from gp) returns Real
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---Purpose: Returns a coefficient to compute the parameter on
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-- the transformed curve for the transform of the
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-- point on <me>.
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--
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-- Transformed(T)->Value(U * ParametricTransformation(T))
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--
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-- is the same point as
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--
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-- Value(U).Transformed(T)
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--
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-- This methods returns T.ScaleFactor()
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is redefined static;
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Copy (me) returns like me
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is redefined static;
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---Purpose: Creates a new object, which is a copy of this parabola.
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fields
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focalLength : Real;
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end;
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