-- File:	ExtElSS.cdl
-- Created:	Wed Jul 22 11:01:39 1992
-- Author:	Laurent PAINNOT
--		<lpa@phylox>
---Copyright:	 Matra Datavision 1992



class   ExtElSS from Extrema 
				   
    	---Purpose: It calculates all the distances between 2 elementary
    	--          surfaces.
    	--          These distances can be maximum or minimum.

uses   	POnSurf              from Extrema,
    	HArray1OfPOnSurf     from Extrema,
	HArray1OfReal        from TColStd,
    	Pnt                  from gp,
	Pln                  from gp,
	Sphere               from gp,
	Cone                 from gp,
	Torus                from gp,
	Cylinder             from gp

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

is

    Create  returns ExtElSS;

    Create (S1,S2: Pln) returns ExtElSS;
      	---Purpose: Calculates the distances between 2 planes.
      	--          These planes can be parallel.
    
    Perform(me: in out; S1,S2: Pln)
    is static;

    Create (S1: Pln; S2: Sphere) returns ExtElSS;
      	---Purpose: Calculates the distances between a plane
      	--          and a sphere.
    
    Perform(me: in out; S1: Pln; S2: Sphere)
    is static;


    Create (S1: Sphere; S2: Sphere) returns ExtElSS;
      	---Purpose: Calculates the distances between 2 spheres.
      	--          These spheres can be parallel.
    
    Perform(me: in out; S1,S2: Sphere)
    is static;


    Create (S1: Sphere; S2: Cylinder) returns ExtElSS;
      	---Purpose: Calculates the distances between a sphere 
      	--          and a cylinder.
    
    Perform(me: in out; S1: Sphere; S2: Cylinder)
    is static;

    Create (S1: Sphere; S2: Cone) returns ExtElSS;
      	---Purpose: Calculates the distances between a sphere
      	--          and a cone. 
    
    Perform(me: in out; S1: Sphere; S2: Cone)
    is static;


    Create (S1: Sphere; S2: Torus) returns ExtElSS;
      	---Purpose: Calculates the distances between a sphere
      	--          and a torus. 
    
    Perform(me: in out; S1: Sphere; S2: Torus)
    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 two surfaces 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.
    	    	OutOfRange,
    	    	-- if N < 1 or N > NbPoints(me)
    	    	InfiniteSolutions from StdFail
		-- if IsParallel(me)=True and N<>1.
    	is static;

    Points (me; N: Integer; P1,P2: out POnSurf)
    	---Purpose: Returns the points for the Nth resulting distance.
    	--          P1 is on the first surface, P2 on the second one.
    	raises  NotDone from StdFail,
    	    	-- if IsDone(me)=False.
    	    	OutOfRange,
    	    	-- if N < 1 or N > NbPoints(me)
    	    	InfiniteSolutions from StdFail
		-- if IsParallel(me)=True and N<>1.
    	is static;

fields
    myDone  : Boolean;
    myIsPar : Boolean;
    myNbExt : Integer;
    mySqDist : HArray1OfReal    from TColStd;
    myPOnS1 : HArray1OfPOnSurf from Extrema;
    myPOnS2 : HArray1OfPOnSurf from Extrema;

end ExtElSS;