-- 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;