You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: drawBezierCurve.m
    path of file: ./repos/matGeom/matGeom/geom2d
    
    the code of the file until where you have to start completion: function varargout = drawBezierCurve(varargin)
%DRAWBEZIERCURVE Draw a cubic bezier curve defined by 4 control points.
%
%   drawBezierCurve(POINTS)
%   Draw the Bezier curve defined by the 4 control points stored in POINTS.
%   POINTS is either a 4-by-2 array (vertical concatenation of control
%   points coordinates), or a 1-by-8 array (horizontal concatenation of
%   control point coordinates). 
%
%   drawBezierCurve(..., PARAM, VALUE)
%   Specifies additional drawing parameters, see the line function for
%   details.
%
%   drawBezierCurve(AX, ...);
%   Spcifies the handle of the axis to draw on.
%
%   H = drawBezierCurve(...);
%   Return a handle to the created graphic object.
%
%
%   Example
%     drawBezierCurve([0 0;5 10;10 5;10 0]);
%     drawBezierCurve([0 0;5 10;10 5;10 0], 'linewidth', 2, 'color', 'g');
%
%   See also 
%     drawPolyline, cubicBezierToPolyline
%


    
function varargout = drawBezierCurve(varargin)
%DRAWBEZIERCURVE Draw a cubic bezier curve defined by 4 control points.
%
%   drawBezierCurve(POINTS)
%   Draw the Bezier curve defined by the 4 control points stored in POINTS.
%   POINTS is either a 4-by-2 array (vertical concatenation of control
%   points coordinates), or a 1-by-8 array (horizontal concatenation of
%   control point coordinates). 
%
%   drawBezierCurve(..., PARAM, VALUE)
%   Specifies additional drawing parameters, see the line function for
%   details.
%
%   drawBezierCurve(AX, ...);
%   Spcifies the handle of the axis to draw on.
%
%   H = drawBezierCurve(...);
%   Return a handle to the created graphic object.
%
%
%   Example
%     drawBezierCurve([0 0;5 10;10 5;10 0]);
%     drawBezierCurve([0 0;5 10;10 5;10 0], 'linewidth', 2, 'color', 'g');
%
%   See also 
%     drawPolyline, cubicBezierToPolyline
%

% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2011-03-16, using Matlab 7.9.0.529 (R2009b)
% Copyright 2011-2023 INRA - Cepia Software Platform

% extract handle of axis to draw on
if isAxisHandle(varargin{1})
    ax = varargin{1};
    varargin(1) = [];
else
    ax = gca;
end