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1 ## Copyright (C) 2006 S�ren Hauberg |
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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} {[@var{fcn}, @var{default_zoom}] =} image_viewer (@var{fcn}, @var{default_zoom}) |
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22 ## Change the program or function used for viewing images and return the |
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23 ## previous values. |
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24 ## |
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25 ## When the @code{image} or @code{imshow} function is called it will |
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26 ## launch an external program to display the image. The default behaviour |
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27 ## is to use gnuplot if the installed version supports image viewing, |
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28 ## and otherwise try the programs @code{display}, @code{xv}, and |
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29 ## @code{xloadimage}. Using this function it is possible to change that |
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30 ## behaviour. |
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31 ## |
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32 ## When called with one input argument images will be displayed by saving |
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33 ## the image to a file and the system command @var{command} will called |
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34 ## to view the image. The @var{command} must be a string containing |
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35 ## @code{%s} and possibly @code{%f}. The @code{%s} will be replaced by |
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36 ## the filename of the image, and the @code{%f} will (if present) be |
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37 ## replaced by the zoom factor given to the @code{image} function. |
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38 ## For example, |
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39 ## @example |
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40 ## image_viewer ("eog %s"); |
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41 ## @end example |
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42 ## changes the image viewer to the @code{eog} program. |
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43 ## |
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44 ## With two input arguments, images will be displayed by calling |
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45 ## the function @var{function_handle}. For example, |
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46 ## @example |
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47 ## image_viewer (data, @@my_image_viewer); |
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48 ## @end example |
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49 ## sets the image viewer function to @code{my_image_viewer}. The image |
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50 ## viewer function is called with |
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51 ## @example |
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52 ## my_image_viewer (@var{x}, @var{y}, @var{im}, @var{zoom}, @var{data}) |
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53 ## @end example |
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54 ## where @var{x} and @var{y} are the axis of the image, @var{im} is the image |
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55 ## variable, and @var{data} is extra user-supplied data to be passed to |
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56 ## the viewer function. |
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57 ## |
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58 ## With three input arguments it is possible to change the zooming. |
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59 ## Some programs (like @code{xloadimage}) require the zoom factor to be |
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60 ## between 0 and 100, and not 0 and 1 like Octave assumes. This is |
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61 ## solved by setting the third argument to 100. |
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62 ## |
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63 ## @seealso{image, imshow} |
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64 ## @end deftypefn |
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65 |
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66 function [ocmd, ofcn, ozoom] = image_viewer (cmd, fcn, zoom) |
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67 |
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68 persistent view_cmd; |
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69 persistent view_fcn; |
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70 persistent view_zoom = 1; |
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71 |
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72 if (isempty (view_fcn)) |
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73 if (isempty (view_cmd) |
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74 && compare_versions (__gnuplot_version__ (), "4.0", ">")) |
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75 view_fcn = "gnuplot_internal"; |
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76 else |
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77 view_fcn = @__img_via_file__; |
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78 endif |
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79 endif |
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80 |
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81 if (nargin > 3) |
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82 print_usage (); |
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83 endif |
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84 |
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85 if (nargout > 0) |
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86 ocmd = view_cmd; |
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87 ofcn = view_fcn; |
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88 ozoom = view_zoom; |
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89 endif |
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90 |
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91 if (nargin > 0) |
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92 |
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93 if (nargin < 3) |
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94 zoom = 1; |
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95 if (nargin < 2) |
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96 fcn = []; |
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97 endif |
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98 endif |
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99 |
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100 view_cmd = cmd; |
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101 view_fcn = fcn; |
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102 view_zoom = zoom; |
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103 |
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104 if (nargin > 1) |
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105 if (isa (fcn, "function_handle")) |
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106 view_fcn = fcn; |
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107 else |
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108 error ("image_viewer: expecting second argument to be a function handle"); |
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109 endif |
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110 endif |
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111 |
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112 if (nargin > 2) |
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113 if (isnumeric (zoom) && isscalar (zoom) && isreal (zoom)) |
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114 view_zoom = zoom; |
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115 else |
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116 error ("image_viewer: expecting third argument to be a real scalar"); |
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117 endif |
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118 endif |
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119 |
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120 endif |
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121 |
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122 endfunction |
