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-- File: ProjPCurGen.cdl
-- Created: Tue Oct 13 18:27:03 1992
-- Author: Laurent BUCHARD
-- <lbr@sdsun2>
---Copyright: Matra Datavision 1992
generic class ProjPCurGen from IntCurve (
TheCurve as any;
TheCurveTool as any) -- as CurveTool from IntCurve(TheCurve)
---Purpose: this class provide a tool which computes the parameter
-- of a point near a parametric curve.
---Level: Internal
uses Pnt2d from gp,
Vec2d from gp,
POnCurv2d from Extrema
class TheCurveLocator instantiates CurveLocator from Extrema (
TheCurve,
TheCurveTool,
TheCurve,
TheCurveTool,
POnCurv2d from Extrema,
Pnt2d from gp);
class TheLocateExtPC instantiates GenLocateExtPC from Extrema (
TheCurve,
TheCurveTool,
POnCurv2d from Extrema,
Pnt2d from gp,
Vec2d from gp);
is
FindParameter(myclass; C: TheCurve;
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: TheCurve;
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 ProjPCurGen;
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