-- 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   ExtElC from Extrema 
	---Purpose: It calculates all the distance between two elementary
	--          curves.
	--          These distances can be maximum or minimum.

uses    Circ    from gp,
     	Elips   from gp,
     	Hypr    from gp,
    	Lin     from gp,
     	Parab   from gp,
	POnCurv from Extrema

raises  InfiniteSolutions from StdFail,
    	NotDone           from StdFail,
    	OutOfRange        from Standard

is
    Create returns ExtElC;

    Create (C1,C2: Lin; AngTol: Real) returns ExtElC;
      	---Purpose: Calculates the distance between two lines.
      	--          AngTol is used to test if the lines are parallel:
      	--          Angle(C1,C2) < AngTol.
    
    Create (C1: Lin; C2: Circ; Tol: Real) returns ExtElC;
        ---Purpose: Calculates the distance between a line and a 
        --          circle.
                  
    Create (C1: Lin; C2: Elips) returns ExtElC;
        ---Purpose: Calculates the distance between a line and an
        --          elipse.
                  
    Create (C1: Lin; C2: Hypr) returns ExtElC;
        ---Purpose: Calculates the distance between a line and a
        --          hyperbola.
                  
    Create (C1: Lin; C2: Parab) returns ExtElC;
        ---Purpose: Calculates the distance between a line and a
        --          parabola.

    Create (C1,C2: Circ) returns ExtElC;
      	---Purpose: Calculates the distance between two circles.
      	--          The circles can be parallel or identical.
    
    Create (C1: Circ; C2: Elips) returns ExtElC;
        ---Purpose: Calculates the distance between a circle and an
        --          elipse.
                  
    Create (C1: Circ; C2: Hypr) returns ExtElC;
        ---Purpose: Calculates the distance between a circle and a
        --          hyperbola.
                  
    Create (C1: Circ; C2: Parab) returns ExtElC;
        ---Purpose: Calculates the distance between a circle and a
        --          parabola.
                  
    Create (C1,C2: Elips) returns ExtElC;
      	---Purpose: Calculates the distance between two elipses.
      	--          The elipses can be parallel or identical.
    
    Create (C1: Elips; C2: Hypr) returns ExtElC;
        ---Purpose: Calculates the distance between an elipse and a
        --          hyperbola.
                  
    Create (C1: Elips; C2: Parab) returns ExtElC;
        ---Purpose: Calculates the distance between an elipse and a
        --          parabola.

    Create (C1,C2: Hypr) returns ExtElC;
      	---Purpose: Calculates the distance between two hyperbolas.
      	--          The hyperbolas can be parallel or identical.
    
    Create (C1: Hypr; C2: Parab) returns ExtElC;
        ---Purpose: Calculates the distance between a hyperbola and a
        --          parabola.

    Create (C1,C2: Parab) returns ExtElC;
      	---Purpose: Calculates the distance between two parabolas
      	--          The parabolas can be parallel or identical.

    IsDone (me) returns Boolean
    	---Purpose: Returns True if the distances are found.
    	is static;

    IsParallel (me) returns Boolean
    	---Purpose: Returns True if the two curves are parallel.
    	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.
    	    	InfiniteSolutions from StdFail
		-- if IsParallel(me)= True.
    	is static;

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

    Points (me; N: Integer; P1,P2: out POnCurv)
    	---Purpose: Returns the points of the Nth extremum distance.
    	--          P1 is on the first curve, P2 on the second one.
    	raises  NotDone from StdFail,
	    	-- if IsDone(me)=False.
    	    	InfiniteSolutions from StdFail,
		-- if IsParallel(me)= True.
    	    	OutOfRange from Standard
		-- if N < 1 or N > NbExt(me)
    	is static;

fields
    myDone : Boolean;
    myIsPar: Boolean;
    myNbExt: Integer;
    --modified by NIZNHY-PKV Fri Nov 21 10:47:21 2008 ft  
    --  it was *[4]	
    mySqDist: Real [6];
    myPoint: POnCurv from Extrema [6,2];

end ExtElC;