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-- File: Geom_ElementarySurface.cdl
-- Created: Wed Mar 10 09:41:01 1993
-- Author: JCV
-- <fid@phylox>
-- Copyright: Matra Datavision 1993
deferred class ElementarySurface from Geom inherits Surface from Geom
---Purpose : Describes the common behavior of surfaces which
-- have a simple parametric equation in a local
-- coordinate system. The Geom package provides
-- several implementations of concrete elementary surfaces:
-- - the plane, and
-- - four simple surfaces of revolution: the cylinder, the
-- cone, the sphere and the torus.
-- An elementary surface inherits the common behavior
-- of Geom_Surface surfaces. Furthermore, it is located
-- in 3D space by a coordinate system (a gp_Ax3
-- object) which is also its local coordinate system.
-- Any elementary surface is oriented, i.e. the normal
-- vector is always defined, and gives the same
-- orientation to the surface, at any point on the surface.
-- In topology this property is referred to as the "outside
-- region of the surface". This orientation is related to
-- the two parametric directions of the surface.
-- Rotation of a surface around the "main Axis" of its
-- coordinate system, in the trigonometric sense given
-- by the "X Direction" and the "Y Direction" of the
-- coordinate system, defines the u parametric direction
-- of that elementary surface of revolution. This is the
-- default construction mode.
-- It is also possible, however, to change the orientation
-- of a surface by reversing one of the two parametric
-- directions: use the UReverse or VReverse functions
-- to change the orientation of the normal at any point on the surface.
-- Warning
-- The local coordinate system of an elementary surface
-- is not necessarily direct:
-- - if it is direct, the trigonometric sense defined by its
-- "main Direction" is the same as the trigonometric
-- sense defined by its two vectors "X Direction" and "Y Direction":
-- "main Direction" = "X Direction" ^ "Y Direction"
-- - if it is indirect, the two definitions of trigonometric
-- sense are opposite:
-- "main Direction" = - "X Direction" ^ "Y Direction"
uses Ax1 from gp,
Ax2 from gp,
Ax3 from gp,
Pnt from gp,
Vec from gp,
Shape from GeomAbs
raises ConstructionError from Standard
is
SetAxis (me : mutable; A1 : Ax1)
---Purpose :
-- Changes the main axis (ZAxis) of the elementary surface.
raises ConstructionError;
---Purpose :
-- Raised if the direction of A1 is parallel to the XAxis of the
-- coordinate system of the surface.
SetLocation (me : mutable; Loc : Pnt);
---Purpose :
-- Changes the location of the local coordinates system of the
-- surface.
SetPosition (me : mutable; A3 : Ax3);
---Purpose :
-- Changes the local coordinates system of the surface.
Axis (me) returns Ax1;
---Purpose :
-- Returns the main axis of the surface (ZAxis).
Location (me) returns Pnt;
---Purpose :
-- Returns the location point of the local coordinate system of the
-- surface.
Position (me) returns Ax3;
---Purpose : Returns the local coordinates system of the surface.
---C++: return const&
UReverse (me : mutable)
---Purpose :
-- Reverses the U parametric direction of the surface.
is virtual;
UReversedParameter (me; U : Real) returns Real
---Purpose: Return the parameter on the Ureversed surface for
-- the point of parameter U on <me>.
--
-- me->UReversed()->Value(me->UReversedParameter(U),V)
-- is the same point as
-- me->Value(U,V)
is deferred;
VReverse (me : mutable)
---Purpose :
-- Reverses the V parametric direction of the surface.
is virtual;
VReversedParameter (me; V : Real) returns Real
---Purpose: Return the parameter on the Vreversed surface for
-- the point of parameter V on <me>.
--
-- me->VReversed()->Value(U,me->VReversedParameter(V))
-- is the same point as
-- me->Value(U,V)
is deferred;
Continuity (me) returns Shape from GeomAbs;
---Purpose : Returns GeomAbs_CN, the global continuity of any elementary surface.
IsCNu (me; N : Integer) returns Boolean;
---Purpose : Returns True.
IsCNv (me; N : Integer) returns Boolean;
---Purpose : Returns True.
fields
pos : Ax3 is protected;
end;
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