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-- File: MakeHypr.cdl
-- Created: Wed Aug 26 14:31:28 1992
-- Author: Remi GILET
-- <reg@topsn3>
---Copyright: Matra Datavision 1992
class MakeHypr from gce inherits Root from gce
---Purpose :This class implements the following algorithms used to
-- create Hyperbola from gp.
-- * Create an Hyperbola from its center, and two points:
-- one on its axis of symmetry giving the major radius, the
-- other giving the value of the small radius.
-- The three points give the plane of the hyperbola.
-- * Create an hyperbola from its axisplacement and its
-- MajorRadius and its MinorRadius.
--
--
-- ^YAxis
-- |
-- FirstConjugateBranch
-- |
-- Other | Main
-- --------------------- C ------------------------------>XAxis
-- Branch | Branch
-- |
-- |
-- SecondConjugateBranch
-- |
--
-- The local cartesian coordinate system of the ellipse is an
-- axis placement (two axis).
--
-- The "XDirection" and the "YDirection" of the axis placement
-- define the plane of the hyperbola.
--
-- The "Direction" of the axis placement defines the normal axis
-- to the hyperbola's plane.
--
-- The "XAxis" of the hyperbola ("Location", "XDirection") is the
-- major axis and the "YAxis" of the hyperbola ("Location",
-- "YDirection") is the minor axis.
--
-- Warnings :
-- The major radius (on the major axis) can be lower than the
-- minor radius (on the minor axis).
uses Pnt from gp,
Hypr from gp,
Ax2 from gp
raises NotDone from StdFail
is
Create (A2 : Ax2 from gp ;
MajorRadius, MinorRadius : Real from Standard ) returns MakeHypr;
--- Purpose :
-- A2 is the local coordinate system of the hyperbola.
-- In the local coordinates system A2 the equation of the
-- hyperbola is :
-- X*X / MajorRadius*MajorRadius - Y*Y / MinorRadius*MinorRadius = 1.0
-- It is not forbidden to create an Hyperbola with MajorRadius =
-- MinorRadius.
-- For the hyperbola the MajorRadius can be lower than the
-- MinorRadius.
-- The status is "NegativeRadius" if MajorRadius < 0.0 and
-- "InvertRadius" if MinorRadius > MajorRadius.
Create(S1,S2 : Pnt from gp;
Center : Pnt from gp) returns MakeHypr;
---Purpose: Constructs a hyperbola
-- - centered on the point Center, where:
-- - the plane of the hyperbola is defined by Center, S1 and S2,
-- - its major axis is defined by Center and S1,
-- - its major radius is the distance between Center and S1, and
-- - its minor radius is the distance between S2 and the major axis.
-- Warning
-- If an error occurs (that is, when IsDone returns
-- false), the Status function returns:
-- - gce_NegativeRadius if MajorRadius is less than 0.0;
-- - gce_InvertRadius if:
-- - the major radius (computed with Center, S1) is
-- less than the minor radius (computed with Center, S1 and S2), or
-- - MajorRadius is less than MinorRadius; or
-- - gce_ColinearPoints if S1, S2 and Center are collinear.
Value(me) returns Hypr from gp
raises NotDone
is static;
---C++: return const&
---Purpose: Returns the constructed hyperbola.
-- Exceptions StdFail_NotDone if no hyperbola is constructed.
Operator(me) returns Hypr from gp
is static;
---C++: return const&
---C++ : alias "Standard_EXPORT operator gp_Hypr() const;"
fields
TheHypr : Hypr from gp;
--The solution from gp.
end MakeHypr;
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