-- Created on: 1994-03-17
-- Created by: Bruno DUMORTIER
-- Copyright (c) 1994-1999 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 GeomAPI

	---Purpose: The   GeomAPI   package  provides  an  Application
	--          Programming Interface for the Geometry.
	--          
	--          The API is a set of  classes and methods aiming to
	--          provide :
	--          
	--          * High level and simple calls  for the most common
	--          operations. 
	--          
	--          *    Keeping   an   access  on    the    low-level
	--          implementation of high-level calls.
	--          
	-- 	    
	-- 	    The API  provides classes to  call the algorithmes
	-- 	    of the Geometry
	-- 	    
	-- 	    * The  constructors  of the classes  provides  the
	-- 	    different constructions methods.
	-- 	    
	-- 	    * The  class keeps as fields the   different tools
	-- 	    used by the algorithmes
	-- 	    
	-- 	    *   The class  provides  a  casting  method to get
	-- 	    automatically the  result  with  a   function-like
	-- 	    call. 
	-- 	    
	-- 	    For example to evaluate the distance <D> between a
	-- 	    point <P> and a curve <C>, one can writes :
	-- 	    
	-- 	        D = GeomAPI_ProjectPointOnCurve(P,C);
	-- 	    
	-- 	    or
	-- 	    
	-- 	        GeomAPI_ProjectPointOnCurve PonC(P,C);
	-- 	        D = PonC.LowerDistance();
	-- 	    


uses

    Geom,
    Geom2d,
    gp,
    TColgp,
    TColStd,
    GeomAdaptor,
    GeomInt,
    IntCurveSurface,
    Extrema,
    GeomAbs,
    Quantity,
    StdFail, 
    Approx
			    

is

    ------------------------------------------------------------------
    -- Those classes  provide algo  to  evaluate  the distance between
    -- points curves and surfaces. 
    ------------------------------------------------------------------

    class ProjectPointOnCurve;

    class ProjectPointOnSurf;

    class ExtremaCurveCurve;
    
    class ExtremaCurveSurface;
    
    class ExtremaSurfaceSurface;



    ------------------------------------------------------------------
    -- Those classes provide algo to evaluate a curve  or a surface 
    -- passing through 
    -- an array of points.
    ------------------------------------------------------------------

    --- Approximation:
    --  
    class PointsToBSpline;

    class PointsToBSplineSurface;

    --- Interpolation:
    --
    class Interpolate;
    

    ------------------------------------------------------------------
    -- Those classes provide algo to intersect two surfaces
    --                       and  to intersect a curve and a surface
    ------------------------------------------------------------------

    class IntSS;

    class IntCS;


    ------------------------------------------------------------------
    -- Those methods are used to switch 3d and 2d curves
    ------------------------------------------------------------------

    To2d(C : Curve from Geom; P : Pln from gp) returns Curve from Geom2d; 
	---Purpose: This function builds (in the
    	-- parametric space of the plane P) a 2D curve equivalent to the 3D curve
    	-- C. The 3D curve C is considered to be located in the plane P.
    	-- Warning
    	-- The 3D curve C must be of one of the following types:
    	-- -      a line
    	-- -      a circle
    	-- -      an ellipse
    	-- -      a hyperbola
    	-- -      a parabola
    	-- -      a Bezier curve
    	-- -      a BSpline curve
    	-- Exceptions Standard_NoSuchObject if C is not a defined type curve.


    To3d(C : Curve from Geom2d; P : Pln from gp) returns Curve from Geom; 
	---Purpose: Builds a 3D curve equivalent to the 2D curve C
    	-- described in the parametric space defined by the local
    	-- coordinate system of plane P.
    	-- The resulting 3D curve is of the same nature as that of the curve C.

end GeomAPI;