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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} image (@var{img}) |
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22 ## @deftypefnx {Function File} {} image (@var{x}, @var{y}, @var{img}) |
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23 ## Display a matrix as a color image. The elements of @var{x} are indices |
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24 ## into the current colormap and should have values between 1 and the |
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25 ## length of the colormap. |
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26 ## |
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27 ## It first tries to use @code{gnuplot}, then @code{display} from |
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28 ## @code{ImageMagick}, then @code{xv}, and then @code{xloadimage}. |
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29 ## The actual program used can be changed using the @code{image_viewer} |
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30 ## function. |
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31 ## |
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32 ## The axis values corresponding to the matrix elements are specified in |
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33 ## @var{x} and @var{y}. If you're not using gnuplot 4.2 or later, these |
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34 ## variables are ignored. |
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35 ## @seealso{imshow, imagesc, colormap, image_viewer} |
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36 ## @end deftypefn |
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37 |
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38 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
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39 ## Created: July 1994 |
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40 ## Adapted-By: jwe |
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41 |
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42 function image (x, y, img) |
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43 |
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44 newplot (); |
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45 |
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46 if (nargin == 0) |
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47 ## Load Bobbie Jo Richardson (Born 3/16/94) |
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48 img = loadimage ("default.img"); |
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49 x = y = []; |
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50 elseif (nargin == 1) |
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51 img = x; |
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52 x = y = []; |
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53 elseif (nargin > 3) |
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54 print_usage (); |
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55 endif |
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56 |
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57 if (isempty (img)) |
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58 error ("image: matrix is empty"); |
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59 endif |
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60 |
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61 ## Use the newly added mode of "plot" called "with image". |
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62 if (isempty (x)) |
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63 x = [1, columns(img)]; |
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64 endif |
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65 |
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66 if (isempty (y)) |
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67 y = [1, rows(img)]; |
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68 endif |
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69 |
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70 ca = gca (); |
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71 |
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72 s = __uiobject_image_ctor__ (ca); |
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73 |
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74 s.cdata = img; |
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75 |
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76 tmp = __uiobject_make_handle__ (s); |
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77 |
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78 __uiobject_adopt__ (ca, tmp); |
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79 |
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80 xlim = [x(1), x(end)]; |
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81 ylim = [y(1), y(end)]; |
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82 |
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83 set (ca, "view", [0, 90], "xlim", xlim, "ylim", ylim); |
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84 |
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85 if (nargout > 0) |
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86 h = tmp; |
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87 endif |
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88 |
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89 drawnow (); |
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90 |
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91 endfunction |
