-- Created on: 1991-02-26
-- Created by: Isabelle GRIGNON
-- Copyright (c) 1991-1999 Matra Datavision
-- Copyright (c) 1999-2014 OPEN CASCADE SAS
--
-- This file is part of Open CASCADE Technology software library.
--
-- This library is free software; you can redistribute it and/or modify it under
-- the terms of the GNU Lesser General Public License version 2.1 as published
-- by the Free Software Foundation, with special exception defined in the file
-- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
-- distribution for complete text of the license and disclaimer of any warranty.
--
-- Alternatively, this file may be used under the terms of Open CASCADE
-- commercial license or contractual agreement.

package Extrema 
    ---Purpose: This package calculates the distances between
    --          points, curves and surfaces.
    --          In general case, the algorithm to find the 
    --          distances is a minimization algorithm of a function
    --          of variables: F(X). It is stopped when:
    --            for X1=X+Dx, F(X) and F(X1) are the same.
    --          The value of Dx can be calculated for all the 
    --          algorithms.

    ---Level : Public. 
    --  All methods of all  classes will be public.


uses
    gp,
    math,
    TColStd,
    TColgp,
    StdFail,
    Standard,
    TCollection,
    GeomAbs,
    Adaptor3d,
    Adaptor2d,
    Geom,
    Geom2d,
	Bnd

is

    enumeration ExtFlag is ExtFlag_MIN, ExtFlag_MAX, ExtFlag_MINMAX;

    enumeration ExtAlgo is ExtAlgo_Grad, ExtAlgo_Tree;
    
    enumeration ElementType is Node, UIsoEdge, VIsoEdge, Face;

    class CurveTool;
    class Curve2dTool;

    generic class Point;
    class POnSurf;
    class POnSurfParams;
    
    -----------------------------------
    -- Treatement of elementary curves 
    -- 	and surfaces extremas:
    -----------------------------------
    class ExtPElC;
    class ExtPElC2d;
    class ExtPElS;
    class ExtPExtS;
    class ExtPRevS;
    class ExtElC;
    class ExtElC2d;

    class ExtElCS;
    class ExtElSS;
    
    -----------------------------------------------
    --  generic classes for  POINT-CURVE  extremas:
    -----------------------------------------------
    private generic class FuncExtPC, SeqPC;
    generic class GenExtPC, PCF;
    generic class GenLocateExtPC, PCLocF;

    -------------------------------------------------
    --  classes for  POINT-SURFACE  extremas:
    -------------------------------------------------
    private class FuncExtPS;
    class GenExtPS;
    class GenLocateExtPS; 
    imported HUBTreeOfSphere;
    
    ----------------------------------------------
    --  generic classes for  CURVE-CURVE extremas:
    ----------------------------------------------
    private generic class FuncExtCC, SeqPOnC;
    generic class GenExtCC;
    generic class GenLocateExtCC, CCLocF;
    
    
    ----------------------------------------------
    --  classes for  CURVE-SURFACE extremas:
    ----------------------------------------------
    private class FuncExtCS;
    class GenExtCS;    
    class GenLocateExtCS;
    
    ----------------------------------------------
    --  classes for  SURFACE-SURFACE extremas:
    ----------------------------------------------
    private class FuncExtSS;
    class GenExtSS;
    class GenLocateExtSS;
    
    --------------------------------------------------
    -- the following classes switches the curve or 
    -- surface types for approximate elementary curves.
    -- the tools are the tools from Adaptor3d.
    --------------------------------------------------
    --  Point-Curve:                                  
    generic class GExtPC, EPC;
    generic class GLocateExtPC, ELPC, LocEPC;
    
    --  Point-Surface:                                  
    class ExtPS;
    
    --  Curve-Curve:                                  
    --  3d:
    class ExtCC;

    class ECC instantiates GenExtCC from Extrema
        (Curve from Adaptor3d,
         CurveTool from Extrema,
         Curve from Adaptor3d,
         CurveTool from Extrema,
         HArray1OfPnt from TColgp,
         POnCurv from Extrema,
         Pnt from gp,
         Vec from gp);

    class LocateExtCC;

    class ELCC    instantiates GenExtCC from Extrema
        (Curve from Adaptor3d,
         CurveTool from Extrema,
         Curve from Adaptor3d,
         CurveTool from Extrema,
         HArray1OfPnt from TColgp,
         POnCurv from Extrema,
         Pnt from gp,
         Vec from gp);

    class LocECC    instantiates GenLocateExtCC from Extrema
        (Curve from Adaptor3d,
         CurveTool from Extrema,
         Curve from Adaptor3d,
         CurveTool from Extrema,
         POnCurv from Extrema,
         Pnt from gp,
         Vec from gp);

    -- 2d:
    class ExtCC2d;

    class ECC2d instantiates GenExtCC from Extrema
        (Curve2d from Adaptor2d,
         Curve2dTool from Extrema,
         Curve2d from Adaptor2d,
         Curve2dTool from Extrema,
         HArray1OfPnt2d from TColgp,
         POnCurv2d from Extrema,
         Pnt2d from gp,
         Vec2d from gp);
    
    class LocateExtCC2d;
    

    class ELCC2d instantiates GenExtCC from Extrema
        (Curve2d from Adaptor2d,
         Curve2dTool from Extrema,
         Curve2d from Adaptor2d,
         Curve2dTool from Extrema,
         HArray1OfPnt2d from TColgp,
         POnCurv2d from Extrema,
         Pnt2d from gp,
         Vec2d from gp);

    class LocECC2d instantiates GenLocateExtCC from Extrema
        (Curve2d from Adaptor2d,
         Curve2dTool from Extrema,
         Curve2d from Adaptor2d,
         Curve2dTool from Extrema,
         POnCurv2d from Extrema,
         Pnt2d from gp,
         Vec2d from gp);
    
    --  Curve-Surface:                                  
    class ExtCS;

    --  Surface-Surface:                                  
    class ExtSS;


    -----------------------------------------------
    -- the following class is used to locate
    -- a first evaluation of the possible extremas. 
    -----------------------------------------------
    generic class CurveLocator;
      
      
    --------------------------------------
    --- instantiations of generic classes:
    --------------------------------------
    class POnCurv instantiates Point from Extrema(Pnt from gp);
    class POnCurv2d instantiates Point from Extrema(Pnt2d from gp);
    
    class Array1OfPOnCurv     instantiates 
    	Array1 from TCollection(POnCurv);
	
    class Array2OfPOnCurv     instantiates 
    	Array2 from TCollection(POnCurv);
	
    class Array1OfPOnCurv2d   instantiates 
    	Array1 from TCollection(POnCurv2d);
	
    class Array2OfPOnCurv2d   instantiates 
    	Array2 from TCollection(POnCurv2d);
	
    class Array1OfPOnSurf     instantiates 
    	Array1 from TCollection(POnSurf);
	
    class Array2OfPOnSurf     instantiates 
    	Array2 from TCollection(POnSurf);
	
    class Array2OfPOnSurfParams instantiates 
    	Array2 from TCollection(POnSurfParams);
	

    class HArray1OfPOnCurv    instantiates 
    	HArray1 from TCollection(POnCurv, Array1OfPOnCurv);
	
    class HArray2OfPOnCurv    instantiates 
    	HArray2 from TCollection(POnCurv, Array2OfPOnCurv);
	
    class HArray1OfPOnCurv2d  instantiates 
    	HArray1 from TCollection(POnCurv2d,Array1OfPOnCurv2d);
	
    class HArray2OfPOnCurv2d  instantiates 
    	HArray2 from TCollection(POnCurv2d,Array2OfPOnCurv2d);
	
    
    class HArray1OfPOnSurf    instantiates 
    	HArray1 from TCollection(POnSurf, Array1OfPOnSurf);
	
    class HArray2OfPOnSurf    instantiates 
    	HArray2 from TCollection(POnSurf, Array2OfPOnSurf);
	
    class HArray2OfPOnSurfParams instantiates 
    	HArray2 from TCollection(POnSurfParams, Array2OfPOnSurfParams);
	

    class SequenceOfPOnCurv   instantiates 
    	Sequence from TCollection(POnCurv);
	
    class SequenceOfPOnCurv2d instantiates 
    	Sequence from TCollection(POnCurv2d);
	
    class SequenceOfPOnSurf   instantiates 
    	Sequence from TCollection(POnSurf);
	


         --- 3d instantiations:
    class ExtPC instantiates GExtPC from Extrema
    	(Curve             from Adaptor3d,
    	 CurveTool         from Extrema,
	 ExtPElC           from Extrema,
	 Pnt               from gp,
    	 Vec               from gp,
    	 POnCurv           from Extrema,
    	 SequenceOfPOnCurv from Extrema);
	 
	     
    class LocateExtPC instantiates GLocateExtPC from Extrema
    	(Curve             from Adaptor3d,
    	 CurveTool         from Extrema,
    	 ExtPElC           from Extrema,
    	 Pnt               from gp,
    	 Vec               from gp,
    	 POnCurv           from Extrema,
    	 SequenceOfPOnCurv from Extrema);

         --- 2d instantiations:
    class ExtPC2d instantiates GExtPC from Extrema
    	(Curve2d             from Adaptor2d,
    	 Curve2dTool         from Extrema,
	 ExtPElC2d           from Extrema,
	 Pnt2d               from gp,
    	 Vec2d               from gp,
    	 POnCurv2d           from Extrema,
    	 SequenceOfPOnCurv2d from Extrema);
	 
	 
    class LocateExtPC2d instantiates GLocateExtPC from Extrema
    	(Curve2d             from Adaptor2d,
    	 Curve2dTool         from Extrema,
    	 ExtPElC2d           from Extrema,
    	 Pnt2d               from gp,
    	 Vec2d               from gp,
    	 POnCurv2d           from Extrema,
    	 SequenceOfPOnCurv2d from Extrema);


end Extrema;