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annotate scripts/image/colormap.m @ 2311:2b5788792cad

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[project @ 1996-07-11 20:18:38 by jwe]
author jwe
date Thu, 11 Jul 1996 20:18:38 +0000
parents 5cffc4b8de57
children 204cc7db6f4a
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1 ### Copyright (C) 1996 John W. Eaton
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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 2, or (at your option)
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8 ### 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, write to the Free
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17 ### Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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18 ### 02111-1307, USA.
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19
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20 ## Set the current colormap.
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21 ##
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22 ## colormap (map) sets the current colormap to map. map should be an n
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23 ## row by 3 column matrix. The columns contain red, green, and blue
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24 ## intensities respectively. All entries should be between 0 and 1
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25 ## inclusive. The new colormap is returned.
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26 ##
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27 ## colormap ("default") restores the default colormap (a gray scale
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28 ## colormap with 64 entries). The default colormap is returned.
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29 ##
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30 ## colormap with no arguments returns the current colormap.
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31
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32 function cmap = colormap (map)
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33
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34 ## Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.
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35
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36 global CURRENT_COLOR_MAP
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37
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38 if (nargin > 1)
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39 usage ("colormap (map)");
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40 endif
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41
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42 if (nargin == 1)
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43 if (isstr (map))
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44 if (strcmp (map, "default"))
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45 CURRENT_COLOR_MAP = gray;
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46 else
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47 error ("invalid argument");
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48 endif
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49 else
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50 ## Set the new color map
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51 CURRENT_COLOR_MAP = map;
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52 endif
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53 elseif (! exist ("CURRENT_COLOR_MAP"))
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54 ## If global color map doesn't exist, create the default map.
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55 CURRENT_COLOR_MAP = gray;
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56 endif
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57
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58 ## Return current color map.
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59
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60 cmap = CURRENT_COLOR_MAP;
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61
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62 endfunction