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-- File: ProjectOnPConicTool.cdl
-- Created: Tue Oct 13 18:36:43 1992
-- Author: Laurent BUCHARD
-- <lbr@sdsun2>
---Copyright: Matra Datavision 1992
private class ProjectOnPConicTool from IntCurve
---Purpose: This class provides a tool which computes the parameter
-- of a point near a parametric conic.
uses Pnt2d from gp,
PConic from IntCurve
is
FindParameter(myclass; C: PConic from IntCurve;
Pnt: Pnt2d from gp;
Tol: Real from Standard)
--- Purpose: Returns the parameter V of the point on the
-- parametric curve corresponding to the Point Pnt. The
-- Correspondance between Pnt and the point P(V) on the
-- parametric curve must be coherent with the way of
-- determination of the signed distance between a point and
-- the implicit curve. Tol is the tolerance on the distance
-- between a point and the parametrised curve. In that case,
-- no bounds are given. The research of the rigth parameter
-- has to be made on the natural parametric domain of the
-- curve.
returns Real from Standard;
FindParameter(myclass; C: PConic from IntCurve;
Pnt: Pnt2d from gp;
LowParameter,HighParameter,Tol: Real from Standard)
--- Purpose: Returns the parameter V of the point on the
-- parametric curve corresponding to the Point Pnt. The
-- Correspondance between Pnt and the point P(V) on the
-- parametric curve must be coherent with the way of
-- determination of the signed distance between a point and
-- the implicit curve. Tol is the tolerance on the distance
-- between a point and the parametrised curve. LowParameter
-- and HighParameter give the boundaries of the interval in
-- wich the parameter certainly lies. These parameters are
-- given to implement a more efficient algoritm. So, it is
-- not necessary to check that the returned value verifies
-- LowParameter <= Value <= HighParameter.
returns Real from Standard;
end ProjectOnPConicTool;
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