-- File:	ChFi3d_SearchSing.cdl
-- Created:	Fri Mar 28 11:11:47 1997
-- Author:	Philippe MANGIN
--		<pmn@sgi29>
---Copyright:	 Matra Datavision 1997


private class SearchSing from ChFi3d inherits FunctionWithDerivative from math

	---Purpose: F(t) = (C1(t) - C2(t)).(C1'(t) - C2'(t));

uses Curve from Geom

is
    Create(C1, C2 : Curve from Geom)
    returns SearchSing from ChFi3d;

    Value(me: in out; X: Real; F: out Real)
    	---Purpose: computes the value of the function <F> for the 
    	--          variable <X>. 
    	--          returns True if the computation was done successfully,
    	--          False otherwise.
    returns Boolean;
    
    Derivative(me: in out; X: Real; D: out Real)
         ---Purpose: computes the derivative <D> of the function 
         --          for the variable <X>.
    	--           Returns True if the calculation were successfully done, 
    	--           False otherwise.

    returns Boolean;    

    Values(me: in out; X: Real; F, D: out Real)
    	---Purpose: computes the value <F> and the derivative <D> of the 
    	--          function for the variable <X>.
    	--          Returns True if the calculation were successfully done,
    	--          False otherwise.

    returns Boolean;

fields
myC1 : Curve from Geom;
myC2 : Curve from Geom;
end SearchSing;