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-- File: MakeElips2d.cdl
-- Created: Wed Aug 26 14:31:40 1992
-- Author: Remi GILET
-- <reg@topsn3>
---Copyright: Matra Datavision 1992
class MakeElips2d from gce inherits Root from gce
---Purpose :This class implements the following algorithms used to
-- create Elips2d from gp.
--
-- * Create an ellipse from its center, and two points:
-- one on the ciconference giving the major radius, the
-- other giving the value of the small radius.
-- * Create an ellipse from its major axis and its major
-- radius and its minor radius.
uses Pnt2d from gp,
Ax2d from gp,
Ax22d from gp,
Elips2d from gp
raises NotDone from StdFail
is
Create (MajorAxis : Ax2d from gp ;
MajorRadius, MinorRadius : Real from Standard ;
Sense : Boolean from Standard = Standard_True)
returns MakeElips2d;
--- Purpose :
-- Creates an ellipse with the major axis, the major and the
-- minor radius. The location of the MajorAxis is the center
-- of the ellipse.
-- The sense of parametrization is given by Sense.
-- It is possible to create an ellipse with MajorRadius = MinorRadius.
-- the status is "InvertRadius" if MajorRadius < MinorRadius or
-- "NegativeRadius" if MinorRadius < 0.0
Create (A : Ax22d from gp ;
MajorRadius, MinorRadius : Real from Standard )
returns MakeElips2d;
--- Purpose :
-- Axis defines the Xaxis and Yaxis of the ellipse which defines
-- the origin and the sense of parametrization.
-- Creates an ellipse with the AxisPlacement the major and the
-- minor radius. The location of Axis is the center
-- of the ellipse.
-- It is possible to create an ellipse with MajorRadius = MinorRadius.
-- the status is "InvertRadius" if MajorRadius < MinorRadius or
-- "NegativeRadius" if MinorRadius < 0.0
Create(S1,S2 : Pnt2d from gp;
Center : Pnt2d from gp) returns MakeElips2d;
---Purpose: Makes an Elips2d with its center and two points.
-- The sense of parametrization is given by S1, S2,
-- and Center.
-- Depending on the constructor, the implicit orientation of the ellipse is:
-- - the sense defined by A,
-- - the sense defined by points Center, S1 and S2,
-- - the trigonometric sense if Sense is not given or is true, or
-- - the opposite if Sense is false.
-- It is possible to construct an ellipse where the major
-- and minor radii are equal.
-- Warning
-- If an error occurs (that is, when IsDone returns
-- false), the Status function returns:
-- - gce_InvertRadius if MajorRadius is less than MinorRadius,
-- - gce_NegativeRadius if MajorRadius or
-- MinorRadius is less than 0.0,
-- - gce_NullAxis if points S1, S2 and Center are collinear, or
-- - gce_InvertAxis if the major radius computed with
-- Center and S1 is less than the minor radius
-- computed with Center, S1 and S2.
Value(me) returns Elips2d from gp
raises NotDone
is static;
---C++: return const&
---Purpose: Returns the constructed ellipse.
-- Exceptions StdFail_NotDone if no ellipse is constructed.
Operator(me) returns Elips2d from gp
is static;
---C++: return const&
---C++: alias "Standard_EXPORT operator gp_Elips2d() const;"
fields
TheElips2d : Elips2d from gp;
--The solution from gp.
end MakeElips2d;
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