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annotate scripts/image/colormap.m @ 1062:1b3a87031641

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[project @ 1995-01-24 02:54:50 by jwe]
author jwe
date Tue, 24 Jan 1995 02:54:50 +0000
parents 56520a75b5b3
children 611d403c7f3d
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1 # Copyright (C) 1995 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 the
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7 # Free Software Foundation; either version 2, or (at your option) any
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8 # later version.
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9 #
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10 # Octave is distributed in the hope that it will be useful, but WITHOUT
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11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 # 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, 675 Mass Ave, Cambridge, MA 02139, USA.
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18
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19 function cmap = colormap (map)
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20
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21 # Set the current colormap.
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22 #
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23 # colormap (map) sets the current colormap to map. map should be an n
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24 # row by 3 column matrix. The columns contain red, green, and blue
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25 # intensities respectively. All entries should be between 0 and 1
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26 # inclusive. The new colormap is returned.
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27 #
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28 # colormap ("default") restores the default colormap (a gray scale
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29 # colormap with 64 entries). The default colormap is returned.
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30 #
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31 # colormap with no arguments returns the current colormap.
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32
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33 # Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.
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34
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35 global CURRENT_COLOR_MAP
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36
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37 if (nargin > 1)
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38 usage ("colormap (map)");
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39 endif
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40
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41 if (nargin == 1)
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42 if (isstr (map))
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43 if (strcmp (map, "default"))
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44 CURRENT_COLOR_MAP = gray;
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45 else
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46 error ("invalid argument");
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47 endif
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48 else
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49 # Set the new color map
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50 CURRENT_COLOR_MAP = map;
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51 endif
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52 elseif (! exist ("CURRENT_COLOR_MAP"))
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53 # If global color map doesn't exist, create the default map.
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54 CURRENT_COLOR_MAP = gray;
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55 endif
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56
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57 # Return current color map.
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58
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59 cmap = CURRENT_COLOR_MAP;
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60
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61 endfunction