-- Created on: 1993-08-11
-- Created by: Bruno DUMORTIER
-- Copyright (c) 1993-1999 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 ProjLib 


	---Purpose: The  projLib package  first provides projection of
	--          curves on a   plane along a  given Direction.  The
	--          result will be a 3D curve.


	---Purpose: The ProjLib package  provides projection of curves
	--          on surfaces to compute the curve in the parametric
	--          space. 
	--          
	--          It is assumed that the curve is on the surface.
	--          
	--          It provides :
	--          
	--          * Package methods to handle the easiest cases :
	--          
	--            - Line, Circle, Ellipse, Parabola, Hyperbola on plane.
	--            
	--            - Line, Circle on cylinder.
	--            
	--            - Line, Circle on cone.
	--            
	--          * Classes to handle the general cases :
	--          
	--            - Plane.
	--          
	--            - Cylinder.
	--            
	--            - Cone.
	--            
	--            - Sphere.
	--            
	--            - Torus.
	--            
	--            
	--          * A generic  class to handle  a Curve from Adaptor3d
	--          on a Surface from Adaptor3d.
	--          

uses
    GeomAbs,       -- Geometry enumeration
    gp,            -- Elementary geometry
    Geom,
    Geom2d,
    Adaptor2d,       -- Curve and Surface interface.
    Adaptor3d,       -- Curve and Surface interface.
    Extrema,       -- for projection of points on surface.
    GeomAdaptor,
    TColgp,
    TColStd,
    TCollection, 
    math 
    
is

    -- ---------------------------------------------------------------
    --  Classes computing the projection of a 3d curve on a surface.
    --  The result will be a 3d curve.
    --  
    --  Make an approximation if necessary
    -- ---------------------------------------------------------------


    class ProjectOnPlane ;

    class ProjectOnSurface ;

    -- ---------------------------------------------------------------
    --  Classes computing the PCurves of  curves lying on a surface
    --  
    --  Make an approximation if necessary
    -- ---------------------------------------------------------------


    class ComputeApprox;

    class ComputeApproxOnPolarSurface ;

    class ProjectedCurve ;

    class HProjectedCurve instantiates 
    	GenHCurve2d from Adaptor2d (ProjectedCurve);

         ---------------------------------------------
         -- Normal projection of a curve on a surface
         -- Computes the different parts
         -----------------------------------------------   	    
    class SequenceOfHSequenceOfPnt 
    	instantiates  Sequence  from TCollection  (HSequenceOfPnt  from  TColgp); 
 
    class HSequenceOfHSequenceOfPnt 
    	instantiates  HSequence  from TCollection  (HSequenceOfPnt  from  TColgp,SequenceOfHSequenceOfPnt  from  ProjLib);  
    class CompProjectedCurve; 
    class HCompProjectedCurve 
    	instantiates  GenHCurve2d  from  Adaptor2d  (CompProjectedCurve); 

    private  class PrjResolve;
    private  class PrjFunc; 


    -- ------------------------------------------------------------
    --  Projection of Curves on Surfaces.
    --  
    --  This classes evaluate   the 2d curve of  a  curve lying  on  a
    --  surface in  some particular case.  See the description of this
    --  classes to have more informations.
    --  
    --  ------------------------------------------------------------

    class Projector;

    class Plane;

    class Cylinder;

    class Cone;

    class Sphere;

    class Torus;


    -- methods

    Project(Pl : Pln      from gp; 
    	    P  : Pnt      from gp )  returns Pnt2d   from gp;

    Project(Pl : Pln      from gp; 
    	    L  : Lin      from gp )  returns Lin2d   from gp;

    Project(Pl : Pln      from gp;
    	    C  : Circ     from gp )  returns Circ2d  from gp;

    Project(Pl : Pln      from gp; 
            E  : Elips    from gp )  returns Elips2d from gp;

    Project(Pl : Pln      from gp; 
            P  : Parab    from gp )  returns Parab2d from gp;

    Project(Pl : Pln      from gp; 
            H  : Hypr     from gp )  returns Hypr2d  from gp;

    Project(Cy : Cylinder from gp; 
    	    P  : Pnt      from gp )  returns Pnt2d   from gp;

    Project(Cy : Cylinder from gp; 
            L  : Lin      from gp )  returns Lin2d   from gp;

    Project(Cy : Cylinder from gp; 
            Ci : Circ     from gp )  returns Lin2d   from gp;

    Project(Co : Cone     from gp; 
    	    P  : Pnt      from gp )  returns Pnt2d   from gp;

    Project(Co : Cone     from gp; 
            L  : Lin      from gp )  returns Lin2d   from gp;

    Project(Co : Cone     from gp; 
            Ci : Circ     from gp )  returns Lin2d   from gp;

    Project(Sp : Sphere   from gp; 
    	    P  : Pnt      from gp )  returns Pnt2d   from gp;

    Project(Sp : Sphere   from gp; 
            Ci : Circ     from gp )  returns Lin2d   from gp;

    Project(To : Torus    from gp; 
    	    P  : Pnt      from gp )  returns Pnt2d   from gp;

    Project(To : Torus    from gp; 
            Ci : Circ     from gp )  returns Lin2d   from gp;

end ProjLib;