-- File:	PConicTool.cdl
-- Created:	Thu Mar 26 16:22:34 1992
-- Author:	Laurent BUCHARD
--		<lbr@topsn3>
---Copyright:	 Matra Datavision 1992



private class PConicTool from IntCurve

	---Purpose: Implementation of the ParTool from IntImpParGen
	--          for conics of gp, using the class PConic from IntCurve.

        ---Level: Internal

uses Pnt2d    from gp,
     Vec2d    from gp,
     Lin2d    from gp,
     XY       from gp,
     PConic from IntCurve

is


    EpsX (myclass; C: PConic)
    	--Purpose: Tolerance used by mathematical algorithms 
    	--         usually about 1e-10
    	returns Real from Standard;


    NbSamples(myclass; C: PConic)
    	--Purpose: returns the number of samples on the parametric curve
    	returns Integer from Standard;

    NbSamples(myclass; C: PConic; U0,U1: Real from Standard)
    	--Purpose: returns the number of samples on the parametric curve
    	returns Integer from Standard;
 

    Value (myclass; C: PConic from IntCurve; X: Real from Standard)
    	--Purpose: Returns the   geometric  point which  lies   at the
    	--         parameter x on the parametric curve.
    	returns Pnt2d from gp;


    D1 (myclass; C: PConic from IntCurve; U: Real from Standard ; 
                 P: out Pnt2d; T: out Vec2d);
    	--Purpose: Computes the Value, First and  Second Derivative at
    	--         the parameter U on the curve.


    D2 (myclass; C: PConic from IntCurve; U: Real from Standard ; 
                 P: out Pnt2d; T,N: out Vec2d);
		 
    	--Purpose: Computes the Value, First and  Second Derivative at
    	--         the parameter U on the curve.
	 		 
end PConicTool;