-- File:	ExtCS.cdl
-- Created:	Thu Feb 21 19:12:30 1991
-- Author:	Isabelle GRIGNON
--		<isg@topsn3>
---Copyright:	 Matra Datavision 1991


class ExtCS from Extrema

    	---Purpose: It calculates all the extremum distances
    	--          between a curve and a surface.
    	--          These distances can be minimum or maximum.

uses  	POnSurf           from Extrema,
    	POnCurv           from Extrema,
    	ExtElCS           from Extrema,
    	Pnt               from gp,
	SurfaceType       from GeomAbs,
	CurveType         from GeomAbs,
	SequenceOfPOnSurf from Extrema,
	SequenceOfPOnCurv from Extrema,
	SequenceOfReal    from TColStd,
	Curve             from Adaptor3d,
	Surface           from Adaptor3d,
	SurfacePtr        from Adaptor3d
	
	

raises  NotDone      from StdFail,
    	OutOfRange   from Standard,
	TypeMismatch from Standard
	
	
is

    Create returns ExtCS;

    Create (C: Curve   from Adaptor3d; 
    	    S: Surface from Adaptor3d; 
    	    TolC, TolS: Real)
    	returns ExtCS;
      	---Purpose: It calculates all the distances between C and S.
    

    Create (C: Curve   from Adaptor3d; 
    	    S: Surface from Adaptor3d; 
    	    UCinf, UCsup: Real;
    	    Uinf, Usup, Vinf, Vsup: Real;
    	    TolC, TolS: Real)
    	returns ExtCS;
      	---Purpose: It calculates all the distances between C and S.
      	--          UCinf and UCmax are the start and end parameters
      	--          of the curve.
    

    Initialize(me: in out; S: Surface from Adaptor3d;
    	       Uinf, Usup, Vinf, Vsup: Real;
	       TolC, TolS: Real)
	---Purpose: Initializes the fields of the algorithm.
    
    is static;


    Perform(me: in out; C: Curve from Adaptor3d; Uinf, Usup: Real)
    	---Purpose: Computes the distances.
    	--          An exception is raised if the fieds have not been 
    	--          initialized.
    
    raises TypeMismatch from Standard
    is static;
    
    
    IsDone (me) returns Boolean
    	---Purpose: Returns True if the distances are found.
    	is static;
    
    IsParallel (me) returns Boolean
    	---Purpose: Returns True if the curve is on a parallel surface.
    	raises  NotDone from StdFail
    	    	-- if IsDone(me)=False.
    	is static;


    NbExt (me) returns Integer
    	---Purpose: Returns the number of extremum distances.
    	raises  NotDone from StdFail
	    	-- if IsDone(me)=False.
    	is static;

    SquareDistance (me; N: Integer) returns Real
    	---Purpose: Returns the value of the Nth resulting square distance.
    	raises  NotDone from StdFail,
    	    	-- if IsDone(me)=False.
    	        OutOfRange
		-- if N < 1 or N > NbPoints(me).
    	is static;

    Points (me; N: Integer; P1: out POnCurv; P2: out POnSurf) 
    	---Purpose: Returns the point of the Nth resulting distance.
    	raises  NotDone from StdFail,
    	    	-- if IsDone(me)=False.
    	        OutOfRange from Standard
		-- if N < 1 or N > NbPoints(me).
    	is static;


    Bidon(me) returns SurfacePtr from Adaptor3d
    is static private;


fields
    myS      : SurfacePtr        from Adaptor3d;
    myDone   : Boolean           from Standard;
    myIsPar  : Boolean           from Standard;
    myExtElCS: ExtElCS           from Extrema;
    myPOnS   : SequenceOfPOnSurf from Extrema;
    myPOnC   : SequenceOfPOnCurv from Extrema;
    myuinf   : Real              from Standard;
    myusup   : Real              from Standard;
    myvinf   : Real              from Standard;
    myvsup   : Real              from Standard;
    mytolC   : Real              from Standard;
    mytolS   : Real              from Standard;
    myucinf  : Real              from Standard;
    myucsup  : Real              from Standard;
    mySqDist : SequenceOfReal    from TColStd;
    myStype  : SurfaceType       from GeomAbs;

end ExtCS;