-- 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;