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Fix warnings
author LYH <lyh.kernel@gmail.com>
date Fri, 27 Sep 2013 17:43:27 +0800
parents 7268845c0a1e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ## Copyright (C) 2012 Rik Wehbring
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2 ## Copyright (C) 2012 Carnë Draug
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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} {} rgbplot (@var{cmap})
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22 ## @deftypefnx {Function File} {} rgbplot (@var{cmap}, @var{style})
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23 ## @deftypefnx {Function File} {@var{h} =} rgbplot (@dots{})
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24 ## Plot the components of a colormap.
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25 ##
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26 ## Two different @var{style}s are available for displaying the @var{cmap}:
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27 ##
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28 ## @table @asis
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29 ## @item profile (default)
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30 ## Plot the RGB line profile of the colormap for each of the channels (red,
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31 ## green and blue) with the plot lines colored appropriately. Each line
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32 ## represents the intensity of each RGB components across the colormap.
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33 ##
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34 ## @item composite
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35 ## Draw the colormap across the X-axis so that the actual index colors are
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36 ## visible rather than the individual color components.
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37 ##
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38 ## @end table
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39 ##
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40 ## The optional return value @var{h} is a graphics handle to the created plot.
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41 ##
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42 ## Run @code{demo rgbplot} to see an example of @code{rgbplot} and each style
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43 ## option.
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44 ## @seealso{colormap}
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45 ## @end deftypefn
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46
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47 function h = rgbplot (cmap, style = "profile")
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48
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49 if (nargin < 1 || nargin > 2)
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50 print_usage ();
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51 endif
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52
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53 if (! iscolormap (cmap))
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54 error ("rgbplot: CMAP must be a valid colormap");
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55 elseif (! ischar (style))
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56 error ("rgbplot: STYLE must be a string");
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57 endif
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58
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59 switch (tolower (style))
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60 case "profile"
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61 htmp = plot (cmap(:,1),"r", cmap(:,2),"g", cmap(:,3),"b");
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62 set (gca, 'ytick', 0:0.1:1);
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63 case "composite"
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64 htmp = image (1:rows(cmap));
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65 set (gca, 'ytick', []);
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66 colormap (cmap);
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67 otherwise
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68 error ("rgbplot: unknown style '%s'", style);
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69 endswitch
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70 xlabel ("color index");
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71
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72 if (nargout > 0)
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73 h = htmp;
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74 endif
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75
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76 endfunction
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77
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78
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79 %!demo
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80 %! clf;
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81 %! subplot (1, 2, 1);
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82 %! rgbplot (ocean, "profile");
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83 %! subplot (1, 2, 2);
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84 %! rgbplot (ocean, "composite");
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85
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86 %% Test input validation
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87 %!error rgbplot ()
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88 %!error rgbplot (1,2)
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89 %!error <CMAP must be a valid colormap> rgbplot ({0 1 0})
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90 %!error <STYLE must be a string> rgbplot ([0 1 0], 2)
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91 %!error <unknown style 'nostyle'> rgbplot ([0 1 0], "nostyle")
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92