## Copyright (C) 2007, 2009 David Bateman
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING.  If not, see
## <http://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn {Function File} {} scatter (@var{x}, @var{y}, @var{s}, @var{c})
## @deftypefnx {Function File} {} scatter (@dots{}, 'filled')
## @deftypefnx {Function File} {} scatter (@dots{}, @var{style})
## @deftypefnx {Function File} {} scatter (@dots{}, @var{prop}, @var{val})
## @deftypefnx {Function File} {} scatter (@var{h}, @dots{})
## @deftypefnx {Function File} {@var{h} =} scatter (@dots{})
##
## Plot a scatter plot of the data.  A marker is plotted at each point 
## defined by the points in the vectors @var{x} and @var{y}.  The size of
## the markers used is determined by the @var{s}, which can be a scalar, 
## a vector of the same length of @var{x} and @var{y}.  If @var{s} is not 
## given or is an empty matrix, then the default value of 8 points is used.
##
## The color of the markers is determined by @var{c}, which can be a string
## defining a fixed color, a 3 element vector giving the red, green and blue 
## components of the color, a vector of the same length as @var{x} that gives
## a scaled index into the current colormap, or a @var{n}-by-3 matrix defining
## the colors of each of the markers individually.
##
## The marker to use can be changed with the @var{style} argument, that is a 
## string defining a marker in the same manner as the @code{plot} command. 
## If the argument 'filled' is given then the markers as filled.  All 
## additional arguments are passed to the underlying patch command.
##
## The optional return value @var{h} provides a handle to the patch object
##
## @example
## @group
## x = randn (100, 1);
## y = randn (100, 1);
## scatter (x, y, [], sqrt(x.^2 + y.^2));
## @end group
## @end example
##
## @seealso{plot, patch, scatter3}
## @end deftypefn

function retval = scatter (varargin)

  [h, varargin, nargin] = __plt_get_axis_arg__ ("scatter", varargin{:});

  if (nargin < 2)
    print_usage ();
  else
    oldh = gca ();
    unwind_protect
      axes (h);
      newplot ();
      tmp = __scatter__ (h, 2, "scatter", varargin{:});
    unwind_protect_cleanup
      axes (oldh);
    end_unwind_protect
  endif

  if (nargout > 0)
    retval = tmp;
  endif

endfunction

%!demo
%! x = randn (100, 1);
%! y = randn (100, 1);
%! scatter (x, y, "r")

%!demo
%! x = randn (100, 1);
%! y = randn (100, 1);
%! scatter (x, y, [], sqrt(x.^2 + y.^2));

%!demo
%! x = rand (10, 1);
%! y = rand (10, 1);
%! s = 10 - 10 * log (x.^2+y.^2);
%! h = scatter (x, y, s, s, "s", "filled");