-- Created on: 1999-06-22
-- Created by: Roman LYGIN
-- Copyright (c) 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.

deferred class ComplexCurve from ShapeExtend inherits Curve from Geom

    ---Purpose: Defines a curve which consists of several segments.
    --          Implements basic interface to it.

uses

    Pnt              from gp,
    Vec              from gp,
    Trsf             from gp,
    Shape            from GeomAbs,
    Curve            from Geom

is

    Initialize returns mutable ComplexCurve from ShapeExtend;
    	---Purpose:

    NbCurves (me) returns Integer is deferred;
    	---Purpose: Returns number of curves
    
    Curve (me; index: Integer) returns Curve from Geom is deferred;
    	---C++: return const &
    	---Purpose: Returns curve given by its index
	
    LocateParameter (me; U   : Real;
    	    	    	 UOut: out Real)
    returns Integer is deferred;
    	---Purpose: Returns number of the curve for the given parameter U
	--          and local paramete r UOut for the found curve
	
    LocalToGlobal (me; index : Integer;
    	    	       Ulocal: Real)
    returns Real is deferred;
    	---Purpose: Returns global parameter for the whole curve according
    	--          to the segment and local parameter on it
	
    Transform (me: mutable; T: Trsf) is redefined;
    	---Purpose: Applies transformation to each curve

    ReversedParameter(me; U: Real) returns Real is redefined;
	---C++: inline
    	---Purpose: Returns 1 - U
    
    FirstParameter (me) returns Real is redefined;
	---C++: inline
    	---Purpose: Returns 0
    
    LastParameter (me) returns Real is redefined;
	---C++: inline
    	---Purpose: Returns 1
    
    IsClosed (me) returns Boolean is redefined;
	---C++: inline
    	---Purpose: Returns True if the curve is closed
    
    IsPeriodic (me) returns Boolean is redefined;
	---C++: inline
    	---Purpose: Returns False
    
    Continuity (me) returns Shape from GeomAbs is redefined;
	---C++: inline
    	---Purpose: Returns GeomAbs_C0
    
    IsCN (me; N: Integer) returns Boolean is redefined;
	---C++: inline
    	---Purpose: Returns False if N > 0
		       
    D0 (me; U: Real; P: out Pnt) is redefined;
    	---Purpose: Returns point at parameter U.
	--          Finds appropriate curve and local parameter on it.
	
    D1 (me; U: Real; P: out Pnt; V1: out Vec) is redefined;
    
    D2 (me; U: Real; P: out Pnt; V1, V2: out Vec) is redefined;
    
    D3 (me; U: Real; P: out Pnt; V1, V2, V3: out Vec) is redefined;
    
    DN (me; U: Real; N: Integer) returns Vec is redefined;

    
    GetScaleFactor(me; ind: Integer) returns Real is deferred;
    	---Purpose: Returns scale factor for recomputing of deviatives.
    
    ---Level: Internal
    
    CheckConnectivity (me: mutable; Preci: Real) returns Boolean;
        ---Purpose: Checks geometrical connectivity of the curves, including
	--          closure (sets fields myClosed)
    
    TransformDN (me; V: in out Vec; ind: Integer; N: Integer) 
    is protected;
    	---Purpose: Transform the derivative according to its order

fields

    myClosed: Boolean is protected;
    
end ComplexCurve;