function varargout = view(varargin)

%VIEW   3-D graph viewpoint specification.

%   VIEW(AZ,EL) and VIEW([AZ,EL]) set the angle of the view from which an

%   observer sees the current 3-D plot.  AZ is the azimuth or horizontal

%   rotation and EL is the vertical elevation (both in degrees). Azimuth

%   revolves about the z-axis, with positive values indicating counter-

%   clockwise rotation of the viewpoint. Positive values of elevation

%   correspond to moving above the object; negative values move below.

%   VIEW([X Y Z]) sets the view angle in Cartesian coordinates. The

%   magnitude of vector X,Y,Z is ignored.

%

%   Here are some examples:

%

%   AZ = -37.5, EL = 30 is the default 3-D view.

%   AZ = 0, EL = 90 is directly overhead and the default 2-D view.

%

%   VIEW(2) sets the default 2-D view, AZ = 0, EL = 90.

%   VIEW(3) sets the default 3-D view, AZ = -37.5, EL = 30.

%

%   [AZ,EL] = VIEW returns the current azimuth and elevation.

%

%   VIEW(AX,...) uses axes AX instead of the current axes.

%

%   See also VIEWMTX.

%   Copyright 1984-2018 The MathWorks, Inc.

narginchk(0,3); 

nargoutchk(0, 2); 

%

% determine which axes the view is to be applied to, as well as what the

% input arguments to ViewCore are going to be

%

viewArgs = {}; 

switch nargin 

 case 0 

  hAxes = gca;

 case { 1, 2 } 

  if isAxesHandle(varargin{1}) 

    hAxes = varargin{1}; 

    viewArgs = varargin(2:end); 

  else

    hAxes = gca;

    viewArgs = varargin(1:end);

  end 

 case 3

  if ~isAxesHandle(varargin{1})

    error(message('MATLAB:view:InvalidFirstArgument'));

  else

    hAxes = varargin{1};

    viewArgs = varargin(2:end);

  end

end 

if isa(hAxes,'matlab.graphics.chart.Chart') 

    %view not supported by charts. Defer to chart for error message

    try

        hAxes.view(varargin);

    catch e

        throw(e)

    end

    return

end 

%

% set the view

%

if ~isempty(viewArgs) 

  if(~all(isnumeric([viewArgs{:}]))) 

    error(message('MATLAB:view:InvalidInputs'));

  end 

  ViewCore(hAxes, viewArgs{:}); 

end 

%

% construct the return args, return the azimuth and elevation for 2 lhs args,

% otherwise, return the transformation matrix

%

switch nargout 

    case {0,1} 

        if( nargin == 0 || nargout == 1) 

            % If VIEW is called without any input

            % arguments, then it is treated as a query

            % command. In which case always return the

            % view matrix.

            % If one output argument is specified, always

            % return the view matrix.

            assert(isa(hAxes, 'matlab.graphics.axis.Axes'), ...

                message('MATLAB:view:OneOutputNotSupported'))

            varargout{1} = getAxesTransformationMatrix(hAxes);

        end 

    case 2

        axView = get(hAxes, 'View');

        varargout{1} = axView(1);

        varargout{2} = axView(2);

end