-- File:	Approx_TheLineTool.cdl
-- Created:	Tue Jan 26 14:46:32 1993
-- Author:	Laurent PAINNOT
--		<lpa@sdsun1>
---Copyright:	 Matra Datavision 1993


deferred generic class TheLineTool from Approx (MLine  as any;
    	    	    	    	    	        MPoint as any)

    ---Purpose: Template which defines all the services relative to
    --          a MultiLine for approximation algorithms.

uses Status        from Approx,
     Pnt           from gp,
     Pnt2d         from gp,
     Vec           from gp,
     Vec2d         from gp,
     Array1OfPnt   from TColgp,
     Array1OfPnt2d from TColgp,
     Array1OfVec   from TColgp,
     Array1OfVec2d from TColgp

is
    
    
    FirstPoint(myclass; ML: MLine) returns Integer;
    	---Purpose: Returns the first index of multipoints of the MLine.


    LastPoint(myclass; ML: MLine) returns Integer;
    	---Purpose: Returns the last index of multipoints of the MLine.



    NbP2d(myclass; ML: MLine) returns Integer;
    	---Purpose: Returns the number of 2d points of a MLine.


    NbP3d(myclass; ML: MLine) returns Integer;
    	---Purpose: Returns the number of 3d points of a MLine.


    Value(myclass; ML: MLine; MPointIndex: Integer; tabPt: out Array1OfPnt);
    	---Purpose: returns the 3d points of the multipoint <MPointIndex>
    	--          when only 3d points exist.


    Value(myclass; ML: MLine; MPointIndex: Integer; 
          tabPt2d: out Array1OfPnt2d);
    	---Purpose: returns the 2d points of the multipoint <MPointIndex>
    	--          when only 2d points exist.


    Value(myclass; ML: MLine; MPointIndex: Integer; 
          tabPt: out Array1OfPnt; tabPt2d: out Array1OfPnt2d);
    	---Purpose: returns the 3d and 2d points of the multipoint 
    	--          <MPointIndex>.


    Tangency(myclass; ML: MLine; MPointIndex: Integer; tabV: out Array1OfVec)
    returns Boolean;
    	---Purpose: returns the 3d derivative values of the multipoint 
    	--          <MPointIndex> when only 3d points exist.


    Tangency(myclass; ML: MLine; MPointIndex: Integer; 
          tabV2d: out Array1OfVec2d)
    returns Boolean;
    	---Purpose: returns the 2d derivative values of the multipoint 
    	--          <MPointIndex> only when 2d points exist.


    Tangency(myclass; ML: MLine; MPointIndex: Integer; 
             tabV: out Array1OfVec; tabV2d: out Array1OfVec2d)
    returns Boolean;
    	---Purpose: returns the 3d and 2d derivative values of the multipoint 
    	--          <MPointIndex>.



    WhatStatus(myclass; ML: MLine; I1, I2: Integer) 
    returns Status from Approx;
    	---Purpose: . if Status = PointsAdded, a new MLine is created between 
    	--            the two MPoints <I1> and <I2> of ML by MakeMLBetween.
    	--          . if Status = NoPointsAdded, no MLine will be created.
    	--            The algorithm will return the best approximation done.
    	--          . if Status = NoApproximation, nothing will be 
    	--            done between <I1> and <I2>.
    
    MakeMLBetween(myclass; ML: MLine; I1, I2: Integer;
                  NbPMin: Integer) 
    returns MLine;
    	---Purpose: Is called if WhatStatus returned "PointsAdded".

end TheLineTool;