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Add demos for colormap functions
author Soren Hauberg <hauberg@gmail.com>
date Thu, 22 Oct 2009 12:18:56 -0400
parents a1dbe9d80eee
children 466ba499eff5
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1 ## Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2002, 2005, 2006,
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2 ## 2007 John W. Eaton
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} ocean (@var{n})
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22 ## Create color colormap. The argument @var{n} should be a scalar. If it
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23 ## is omitted, the length of the current colormap or 64 is assumed.
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24 ## @end deftypefn
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26 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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27 ## Created: July 1994
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28 ## Adapted-By: jwe
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30 function map = ocean (number)
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32 if (nargin == 0)
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33 number = rows (colormap);
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34 elseif (nargin == 1)
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35 if (! isscalar (number))
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36 error ("ocean: argument must be a scalar");
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37 endif
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38 else
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39 print_usage ();
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40 endif
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41
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42 cutin = fix (number/3);
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43
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44 dr = (number - 1) / cutin;
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45
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46 r = prepad ([0:dr:(number-1)], number)';
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47
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48 dg = (number - 1) / (2 * cutin);
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49
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50 g = prepad([0:dg:(number-1)], number)';
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51
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52 b = [0:(number-1)]';
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53
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54 map = [ r, g, b ] / (number - 1);
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55
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56 endfunction
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57
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58 %!demo
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59 %! ## Show the 'ocean' colormap as an image
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60 %! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
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61 %! axis ([1, 64, 0, 1], "ticy", "xy")
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62 %! colormap ocean
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63