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scripts/image/copper.m

changeset 10289: 4b124317dc38
parent:16f53d29049f
author: John W. Eaton <jwe@octave.org>
date: Tue Feb 09 20:58:55 2010 -0500 (34 minutes ago)
permissions: -rw-r--r--
description: base_properties::set_children: account for hidden children 
     1## Copyright (C) 1999, 2000, 2007, 2009 Kai Habel

     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} {} copper (@var{n})

    21## Create color colormap.  This colormap is black to a light copper tone.

    22## The argument @var{n} should be a scalar.  If it

    23## is omitted, the length of the current colormap or 64 is assumed.

    24## @seealso{colormap}

    25## @end deftypefn

    26

    27## Author:  Kai Habel <kai.habel@gmx.de>

    28

    29function map = copper (number)

    30

    31  if (nargin == 0)

    32    number = rows (colormap);

    33  elseif (nargin == 1)

    34    if (! isscalar (number))

    35      error ("copper: argument must be a scalar");

    36    endif

    37  else

    38    print_usage ();

    39  endif

    40

    41  if (number == 1)

    42    map = [0, 0, 0];  

    43  elseif (number > 1)

    44    x = linspace (0, 1, number)';

    45    r = (x < 4/5) .* (5/4 * x) + (x >= 4/5);

    46    g = 4/5 * x;

    47    b = 1/2 * x;

    48    map = [r, g, b];

    49  else

    50    map = [];

    51  endif

    52

    53endfunction

    54

    55%!demo

    56%! ## Show the 'copper' colormap as an image

    57%! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')

    58%! axis ([1, 64, 0, 1], "ticy", "xy")

    59%! colormap copper

    60