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1 ## Copyright (C) 1996, 1997 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 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
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33 ## Created: July 1994 |
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34 ## Adapted-By: jwe |
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35 |
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36 function cmap = colormap (map) |
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37 |
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38 global __current_color_map__ = gray (); |
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39 |
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40 if (nargin > 1) |
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41 usage ("colormap (map)"); |
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42 endif |
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43 |
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44 if (nargin == 1) |
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45 |
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46 if (isstr (map)) |
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47 if (strcmp (map, "default")) |
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48 map = gray (); |
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49 else |
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50 unwind_protect |
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51 save_default_eval_print_flag = default_eval_print_flag; |
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52 default_eval_print_flag = 0; |
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53 map = eval (map); |
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54 unwind_protect_cleanup |
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55 default_eval_print_flag = save_default_eval_print_flag; |
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56 end_unwind_protect |
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57 endif |
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58 endif |
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59 |
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60 if (! isempty (map)) |
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61 if (columns (map) != 3) |
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62 error( "colormap: map must have 3 columns: [R,G,B]." ); |
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63 endif |
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64 if (min (min (map)) < 0 || max (max (map)) > 1) |
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65 error( "colormap: map must have values in [0,1]." ); |
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66 endif |
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67 ## Set the new color map |
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68 __current_color_map__ = map; |
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69 endif |
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70 |
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71 endif |
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72 |
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73 ## Return current color map. |
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74 cmap = __current_color_map__; |
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75 |
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76 endfunction |