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scripts/image/gmap40.m

changeset 10289: 4b124317dc38
parent:16f53d29049f
author: John W. Eaton <jwe@octave.org>
date: Tue Feb 09 20:58:55 2010 -0500 (44 minutes ago)
permissions: -rw-r--r--
description: base_properties::set_children: account for hidden children 
     1## Copyright (C) 2007, 2008, 2009 David Bateman

     2##

     3## This file is part of Octave.

     4##

     5## Octave is free software; you can redistribute it and/or modify it

     6## under the terms of the GNU General Public License as published by

     7## the Free Software Foundation; either version 3 of the License, or (at

     8## your option) any later version.

     9##

    10## Octave is distributed in the hope that it will be useful, but

    11## WITHOUT ANY WARRANTY; without even the implied warranty of

    12## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    13## General Public License for more details.

    14##

    15## You should have received a copy of the GNU General Public License

    16## along with Octave; see the file COPYING.  If not, see

    17## <http://www.gnu.org/licenses/>.

    18

    19## -*- texinfo -*-

    20## @deftypefn {Function File} {} gmap40 (@var{n})

    21## Create a color colormap.  The colormap is red, green, blue, yellow,

    22## magenta and cyan.  These are the colors that are allowed with patch

    23## objects using gnuplot 4.0, and so this colormap function is specially

    24## designed for users of gnuplot 4.0.  The argument @var{n} should be 

    25## a scalar.  If it is omitted, a length of 6 is assumed.  Larger values

    26## of @var{n} result in a repetition of the above colors

    27## @seealso{colormap}

    28## @end deftypefn

    29

    30function map = gmap40 (number)

    31

    32  if (nargin == 0)

    33    number = 6;

    34  elseif (nargin == 1)

    35    if (! isscalar (number))

    36      error ("gmap40: argument must be a scalar");

    37    endif

    38  else

    39    print_usage ();

    40  endif

    41

    42  if (number >= 1)

    43    map = repmat ([1, 0, 0; 0, 1, 0; 0, 0, 1; 1, 1, 0; 1, 0, 1; 0, 1, 1],

    44		  ceil (number / 6), 1) (1:number, :);

    45  else

    46    map = [];

    47  endif

    48

    49endfunction

    50

    51%!demo

    52%! ## Show the 'gmap40' colormap as an image

    53%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')

    54%! axis ([1, 64, 0, 1], "ticy", "xy")

    55%! colormap gmap40

    56