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annotate scripts/image/rgbplot.m @ 15515:4beb3a4bd440

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rgbplot.m, cmpermute.m, cmunique.m, ind2rgb.m, imwrite.m: use core iscolormap function
author Carnë Draug <carandraug+dev@gmail.com>
date Fri, 12 Oct 2012 23:11:08 +0200
parents e2a14d1b4eaa
children 3f1b306e2ba9
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e2a14d1b4eaa rgbplot.m: Add new Matlab compatible function for plotting colormaps
Rik <octave@nomad.inbox5.com>
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1 ## Copyright (C) 2012 Rik Wehbring
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} rgbplot (@var{cmap})
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21 ## Plot the components of a colormap.
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22 ##
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23 ## The first column is plotted in red, the second column in green, and
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24 ## the third column in blue. The values are between 0 and 1 and represent
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25 ## the intensity of the RGB components in the given indexed color.
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26 ## @seealso{colormap}
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27 ## @end deftypefn
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28
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29 function rgbplot (cmap)
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30
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31 if (nargin != 1)
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32 print_usage ();
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33 endif
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34
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4beb3a4bd440 rgbplot.m, cmpermute.m, cmunique.m, ind2rgb.m, imwrite.m: use core iscolormap function
Carnë Draug <carandraug+dev@gmail.com>
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35 if (! iscolormap (cmap))
4beb3a4bd440 rgbplot.m, cmpermute.m, cmunique.m, ind2rgb.m, imwrite.m: use core iscolormap function
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36 error ("rgbplot: CMAP must be a colormap");
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37 endif
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38
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39 plot (cmap(:,1),"r", cmap(:,2),"g", cmap(:,3),"b");
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40 set (gca, 'ytick', 0:0.1:1);
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41 xlabel ("color index");
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42
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43 endfunction
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44
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45
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46 %!demo
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47 %! clf;
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48 %! rgbplot (ocean);
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49
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50 %%test input validation
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51 %!error rgbplot ()
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52 %!error rgbplot (1,2)
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parents: 14271
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53 %!error <CMAP must be a colormap> rgbplot ({0 1 0})