-- Created on: 1991-02-21
-- Created by: Isabelle GRIGNON
-- Copyright (c) 1991-1999 Matra Datavision
-- Copyright (c) 1999-2012 OPEN CASCADE SAS
--
-- The content of this file is subject to the Open CASCADE Technology Public
-- License Version 6.5 (the "License"). You may not use the content of this file
-- except in compliance with the License. Please obtain a copy of the License
-- at http://www.opencascade.org and read it completely before using this file.
--
-- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
-- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
--
-- The Original Code and all software distributed under the License is
-- distributed on an "AS IS" basis, without warranty of any kind, and the
-- Initial Developer hereby disclaims all such warranties, including without
-- limitation, any warranties of merchantability, fitness for a particular
-- purpose or non-infringement. Please see the License for the specific terms
-- and conditions governing the rights and limitations under the License.



class ExtSS from Extrema 
    	---Purpose: It calculates all the extremum distances
    	--          between two surfaces.
    	--          These distances can be minimum or maximum.

uses  	POnSurf           from Extrema,
    	ExtElSS           from Extrema,
    	Pnt               from gp,
	SurfaceType       from GeomAbs,
	SequenceOfPOnSurf from Extrema,
	SequenceOfReal    from TColStd,
	Surface           from Adaptor3d,
	SurfacePtr        from Adaptor3d
	

raises  NotDone      from StdFail,
    	OutOfRange   from Standard,
	TypeMismatch from Standard
	
	
is
    Create returns ExtSS;


    Create (S1, S2: Surface from Adaptor3d; TolS1, TolS2: Real)
    	returns ExtSS;
      	---Purpose: It calculates all the distances between S1 and S2.
    

    Create (S1, S2: Surface from Adaptor3d;
    	    Uinf1, Usup1, Vinf1, Vsup1: Real;
    	    Uinf2, Usup2, Vinf2, Vsup2: Real;
    	    TolS1, TolS2: Real)
    	returns ExtSS;
      	---Purpose: It calculates all the distances between S1 and S2.
    

    Initialize(me: in out; S2: Surface from Adaptor3d;
    	       Uinf2, Usup2, Vinf2, Vsup2: Real; TolS1: Real)
	---Purpose: Initializes the fields of the algorithm.
    
    is static;
    
    Perform(me: in out; S1: Surface from Adaptor3d; 
    	    Uinf1, Usup1, Vinf1, Vsup1: Real; TolS1: 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 POnSurf; 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
    myS2     : SurfacePtr        from Adaptor3d;
    myDone   : Boolean           from Standard;
    myIsPar  : Boolean           from Standard;
    myExtElSS: ExtElSS           from Extrema;
    myPOnS1  : SequenceOfPOnSurf from Extrema;
    myPOnS2  : SequenceOfPOnSurf from Extrema;
    myuinf1  : Real              from Standard;
    myusup1  : Real              from Standard;
    myvinf1  : Real              from Standard;
    myvsup1  : Real              from Standard;
    myuinf2  : Real              from Standard;
    myusup2  : Real              from Standard;
    myvinf2  : Real              from Standard;
    myvsup2  : Real              from Standard;
    mytolS1  : Real              from Standard;
    mytolS2  : Real              from Standard;
    mySqDist : SequenceOfReal    from TColStd;
    myStype  : SurfaceType       from GeomAbs;

end ExtSS;