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-- File: BndLib_Add2dCurve.cdl
-- Created: Fri Jul 9 10:35:47 1993
-- Author: Isabelle GRIGNON
-- <isg@sdsun2>
---Copyright: Matra Datavision 1993
class Add2dCurve from BndLib
---Purpose: Computes the bounding box for a curve in 2d .
-- Functions to add a 2D curve to a bounding box.
-- The 2D curve is defined from a Geom2d curve.
uses Box2d from Bnd,
Curve2d from Adaptor2d
is
Add(myclass; C : Curve2d from Adaptor2d;
Tol : Real from Standard;
B : in out Box2d from Bnd);
---Purpose: Adds to the bounding box B the curve C
-- B is then enlarged by the tolerance value Tol.
-- Note: depending on the type of curve, one of the following
-- representations of the curve C is used to include it in the bounding box B:
-- - an exact representation if C is built from a line, a circle or a conic curve,
-- - the poles of the curve if C is built from a Bezier curve or a BSpline curve,
-- - if not, the points of an approximation of the curve C.
-- Warning
-- C is an adapted curve, that is, an object which is an interface between:
-- - the services provided by a 2D curve from the package Geom2d
-- - and those required of the curve by the computation algorithm.
-- The adapted curve is created in the following way:
-- Handle(Geom2d_Curve) mycurve = ...
-- ;
-- Geom2dAdaptor_Curve C(mycurve);
-- The bounding box B is then enlarged by adding it:
-- Bnd_Box2d B;
-- // ...
-- Standard_Real Tol = ... ;
-- Add2dCurve::Add ( C, Tol, B );
-- Exceptions
-- Standard_Failure if the curve is built from:
-- - a Geom_Line, or
-- - a Geom_Parabola, or
-- - a Geom_Hyperbola,
-- and P1 and P2 are either two negative infinite real
-- numbers, or two positive infinite real numbers.
Add(myclass; C : Curve2d from Adaptor2d;
U1,U2 : Real from Standard;
Tol : Real from Standard;
B : in out Box2d from Bnd);
---Purpose: Adds to the bounding box Bthe arc of the curve C limited by the two parameter
-- values P1 and P2.
-- B is then enlarged by the tolerance value Tol.
-- Note: depending on the type of curve, one of the following
-- representations of the curve C is used to include it in the bounding box B:
-- - an exact representation if C is built from a line, a circle or a conic curve,
-- - the poles of the curve if C is built from a Bezier curve or a BSpline curve,
-- - if not, the points of an approximation of the curve C.
-- Warning
-- C is an adapted curve, that is, an object which is an interface between:
-- - the services provided by a 2D curve from the package Geom2d
-- - and those required of the curve by the computation algorithm.
-- The adapted curve is created in the following way:
-- Handle(Geom2d_Curve) mycurve = ...
-- ;
-- Geom2dAdaptor_Curve C(mycurve);
-- The bounding box B is then enlarged by adding it:
-- Bnd_Box2d B;
-- // ...
-- Standard_Real Tol = ... ;
-- Add2dCurve::Add ( C, Tol, B );
-- Exceptions
-- Standard_Failure if the curve is built from:
-- - a Geom_Line, or
-- - a Geom_Parabola, or
-- - a Geom_Hyperbola,
-- and P1 and P2 are either two negative infinite real
-- numbers, or two positive infinite real numbers.
end Add2dCurve;
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