Mercurial > octave-nkf
annotate scripts/image/imshow.m @ 20337:928e2c6f888e
imshow.m: Respect new 'parent' property when setting axis properties.
* imshow.m: Apply axes properties to parent of created image.
Add input validation to ensure "parent" property is an axes.
Add BIST test to check input validation.
author | Rik <rik@octave.org> |
---|---|
date | Sun, 05 Jul 2015 21:31:46 -0700 |
parents | eca5aa3225f4 |
children | a3bf503652b2 |
rev | line source |
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1 ## Copyright (C) 1994-2015 John W. Eaton |
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2 ## |
2313 | 3 ## This file is part of Octave. |
4 ## | |
5 ## Octave is free software; you can redistribute it and/or modify it | |
6 ## under the terms of the GNU General Public License as published by | |
7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
8 ## your option) any later version. | |
2313 | 9 ## |
10 ## Octave is distributed in the hope that it will be useful, but | |
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 ## General Public License for more details. | |
14 ## | |
15 ## You should have received a copy of the GNU General Public License | |
7016 | 16 ## along with Octave; see the file COPYING. If not, see |
17 ## <http://www.gnu.org/licenses/>. | |
1024 | 18 |
3381 | 19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} imshow (@var{im}) |
5934 | 21 ## @deftypefnx {Function File} {} imshow (@var{im}, @var{limits}) |
22 ## @deftypefnx {Function File} {} imshow (@var{im}, @var{map}) | |
7074 | 23 ## @deftypefnx {Function File} {} imshow (@var{rgb}, @dots{}) |
5934 | 24 ## @deftypefnx {Function File} {} imshow (@var{filename}) |
6309 | 25 ## @deftypefnx {Function File} {} imshow (@dots{}, @var{string_param1}, @var{value1}, @dots{}) |
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26 ## @deftypefnx {Function File} {@var{h} =} imshow (@dots{}) |
6368 | 27 ## Display the image @var{im}, where @var{im} can be a 2-dimensional |
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28 ## (grayscale image) or a 3-dimensional (RGB image) matrix. |
5934 | 29 ## |
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30 ## If @var{limits} is a 2-element vector @code{[@var{low}, @var{high}]}, the |
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31 ## image is shown using a display range between @var{low} and @var{high}. If |
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32 ## an empty matrix is passed for @var{limits}, the display range is computed |
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33 ## as the range between the minimal and the maximal value in the image. |
3426 | 34 ## |
5934 | 35 ## If @var{map} is a valid color map, the image will be shown as an indexed |
36 ## image using the supplied color map. | |
37 ## | |
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38 ## If a file name is given instead of an image, the file will be read and shown. |
3426 | 39 ## |
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40 ## If given, the parameter @var{string_param1} has value @var{value1}. |
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41 ## @var{string_param1} can be any of the following: |
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42 ## |
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43 ## @table @asis |
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44 ## @item @qcode{"displayrange"} |
5934 | 45 ## @var{value1} is the display range as described above. |
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46 ## |
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47 ## @item @qcode{"colormap"} |
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48 ## @var{value1} is the colormap to use when displaying an indexed image. |
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49 ## |
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50 ## @item @qcode{"xdata"} |
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51 ## If @var{value1} is a two element vector, it must contain horizontal axis |
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52 ## limits in the form [xmin xmax]; Otherwise @var{value1} must be a vector and |
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53 ## only the first and last elements will be used for xmin and xmax respectively. |
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54 ## |
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55 ## @item @qcode{"ydata"} |
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56 ## If @var{value1} is a two element vector, it must contain vertical axis |
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57 ## limits in the form [ymin ymax]; Otherwise @var{value1} must be a vector and |
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58 ## only the first and last elements will be used for ymin and ymax respectively. |
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59 ## |
5934 | 60 ## @end table |
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61 ## |
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62 ## The optional return value @var{h} is a graphics handle to the image. |
5642 | 63 ## @seealso{image, imagesc, colormap, gray2ind, rgb2ind} |
3373 | 64 ## @end deftypefn |
904 | 65 |
7074 | 66 ## Author: Stefan van der Walt <stefan@sun.ac.za> |
5934 | 67 ## Author: Soren Hauberg <hauberg at gmail dot com> |
2312 | 68 ## Adapted-By: jwe |
559 | 69 |
7074 | 70 function h = imshow (im, varargin) |
559 | 71 |
5934 | 72 if (nargin == 0) |
73 print_usage (); | |
5318 | 74 endif |
75 | |
7328 | 76 display_range = NA; |
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77 truecolor = false; |
7074 | 78 indexed = false; |
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79 xdata = ydata = []; |
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80 prop_val_args = {}; |
7074 | 81 |
5935 | 82 ## Get the image. |
5934 | 83 if (ischar (im)) |
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84 [im, map] = imread (im); |
7074 | 85 indexed = true; |
86 colormap (map); | |
87 endif | |
88 | |
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89 nd = ndims (im); |
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90 |
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91 if (! ((isnumeric (im) || islogical (im)) && (nd == 2 || nd == 3))) |
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92 error ("imshow: IM must be an image or the filename of an image"); |
5318 | 93 endif |
7074 | 94 |
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95 if (nd == 2) |
7074 | 96 if (! indexed) |
97 colormap (gray ()); | |
98 endif | |
99 elseif (size (im, 3) == 3) | |
100 if (ismember (class (im), {"uint8", "uint16", "double", "single"})) | |
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101 truecolor = true; |
7074 | 102 else |
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103 error ("imshow: TrueColor image must be uint8, uint16, double, or single"); |
7074 | 104 endif |
105 else | |
106 error ("imshow: expecting MxN or MxNx3 matrix for image"); | |
5318 | 107 endif |
108 | |
7074 | 109 narg = 1; |
110 while (narg <= numel (varargin)) | |
111 arg = varargin{narg++}; | |
112 if (isnumeric (arg)) | |
7331 | 113 if (numel (arg) == 2 || isempty (arg)) |
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114 display_range = arg; |
7074 | 115 elseif (columns (arg) == 3) |
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116 indexed = true; |
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117 if (iscolormap (arg)) |
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118 colormap (arg); |
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119 else |
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120 error ("imshow: invalid colormap MAP"); |
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121 endif |
7074 | 122 elseif (! isempty (arg)) |
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123 error ("imshow: argument number %d is invalid", narg); |
7074 | 124 endif |
125 elseif (ischar (arg)) | |
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126 switch (tolower (arg)) |
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127 case "border" |
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128 warning ("imshow: border argument is not implemented"); |
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129 narg++; |
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130 case "colormap" |
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131 map = varargin{narg++}; |
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132 if (iscolormap (map)) |
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133 colormap (map); |
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134 else |
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135 error ("imshow: invalid colormap"); |
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136 endif |
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137 case "displayrange" |
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138 display_range = varargin{narg++}; |
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139 case {"initialmagnification"} |
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140 warning ("imshow: zoom argument ignored -- use GUI features"); |
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141 narg++; |
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142 case "parent" |
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143 prop_val_args(end+(1:2)) = {"parent", varargin{narg++}}; |
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144 if (! isaxes (prop_val_args{end})) |
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145 error ("imshow: parent must be an axes handle"); |
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146 endif |
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147 case "reduce" |
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148 warning ("imshow: reduce argument is not implemented"); |
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149 narg++; |
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150 case "xdata" |
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151 xdata = varargin{narg++}; |
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152 if (! isvector (xdata)) |
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153 error ("imshow: xdata must be a vector") |
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154 endif |
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155 xdata = [xdata(1) xdata(end)]; |
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156 case "ydata" |
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157 ydata = varargin{narg++}; |
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158 if (! isvector (ydata)) |
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159 error ("imshow: ydata must be a vector") |
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160 endif |
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161 ydata = [ydata(1) ydata(end)]; |
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162 otherwise |
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163 warning ("imshow: unrecognized property %s", arg); |
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164 narg++; |
7074 | 165 endswitch |
166 else | |
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167 error ("imshow: argument number %d is invalid", narg); |
7074 | 168 endif |
169 endwhile | |
170 | |
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171 ## Check for complex images. |
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172 if (iscomplex (im)) |
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173 warning ("imshow: only showing real part of complex image"); |
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174 im = real (im); |
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175 endif |
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176 |
8117 | 177 ## Set default display range if display_range not set yet. |
7328 | 178 if (isempty (display_range)) |
7074 | 179 display_range = [min(im(:)), max(im(:))]; |
8117 | 180 elseif (isna (display_range)) |
7074 | 181 t = class (im); |
182 switch (t) | |
183 case {"double", "single", "logical"} | |
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184 display_range = [0, 1]; |
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185 case {"uint8", "uint16", "int16"} |
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186 display_range = [intmin(t), intmax(t)]; |
7074 | 187 otherwise |
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188 error ("imshow: invalid data type for image"); |
7074 | 189 endswitch |
190 endif | |
5934 | 191 |
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192 if (isfloat (im)) |
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193 nans = isnan (im(:)); |
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194 if (any (nans)) |
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195 warning ("Octave:imshow-NaN", |
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196 "imshow: pixels with NaN or NA values are set to minimum pixel value"); |
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197 im(nans) = display_range(1); |
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198 endif |
7074 | 199 endif |
200 | |
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201 if (truecolor || indexed) |
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202 htmp = image (xdata, ydata, im, prop_val_args{:}); |
5934 | 203 else |
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204 htmp = imagesc (xdata, ydata, im, display_range, prop_val_args{:}); |
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205 set (get (htmp, "parent"), "clim", display_range); |
5934 | 206 endif |
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207 set (get (htmp, "parent"), "visible", "off", "view", [0, 90], |
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208 "ydir", "reverse", "layer", "top"); |
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209 axis ("image"); |
7074 | 210 |
211 if (nargout > 0) | |
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212 h = htmp; |
7074 | 213 endif |
214 | |
559 | 215 endfunction |
4836 | 216 |
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217 |
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218 %!demo |
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219 %! clf; |
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220 %! imshow ("default.img"); |
4836 | 221 |
222 %!demo | |
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223 %! clf; |
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224 %! imshow ("default.img"); |
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225 %! colormap (autumn (64)); |
7074 | 226 |
227 %!demo | |
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228 %! clf; |
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229 %! [I, M] = imread ("default.img"); |
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230 %! imshow (I, M); |
4836 | 231 |
232 %!demo | |
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233 %! clf; |
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234 %! [I, M] = imread ("default.img"); |
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235 %! [R, G, B] = ind2rgb (I, M); |
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236 %! imshow (cat (3, R, G*0.5, B*0.8)); |
5318 | 237 |
238 %!demo | |
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239 %! clf; |
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240 %! imshow (rand (100, 100)); |
5318 | 241 |
242 %!demo | |
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243 %! clf; |
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244 %! imshow (rand (100, 100, 3)); |
7074 | 245 |
246 %!demo | |
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247 %! clf; |
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248 %! imshow (100*rand (100, 100, 3)); |
7074 | 249 |
250 %!demo | |
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251 %! clf; |
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252 %! imshow (rand (100, 100)); |
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253 %! colormap (jet (64)); |
7074 | 254 |
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255 ## Test input validation |
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256 %!error imshow () |
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257 %!error <IM must be an image> imshow ({"cell"}) |
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258 %!error <TrueColor image must be uint8> imshow (ones (3,3,3, "uint32")) |
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259 %!error <TrueColor image must be uint8> imshow (ones (3,3,3, "int16")) |
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260 %!error <expecting MxN or MxNx3 matrix> imshow (ones (4,4,4)) |
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261 |
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262 %!test |
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263 %! hf = figure ("visible", "off"); |
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264 %! unwind_protect |
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265 %! fail ("imshow ([1,1], [2 0 0])", "invalid colormap MAP"); |
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266 %! fail ("imshow ([1,1], [1 0 0 0])", "argument number 2 is invalid"); |
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267 %! fail ('imshow ([1,1], "colormap", [2 0 0])', "invalid colormap"); |
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268 %! fail ('imshow ([1,1], "parent", -1)', "must be an axes handle"); |
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269 %! fail ('imshow ([1,1], "xdata", ones (2,2))', "xdata must be a vector"); |
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270 %! fail ('imshow ([1,1], "ydata", ones (2,2))', "ydata must be a vector"); |
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271 %! fail ('imshow ([1,1], "foobar")', "warning", "unrecognized property foobar") |
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272 %! fail ("imshow ([1,1], {1})", "argument number 2 is invalid"); |
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273 %! fail ("imshow ([1+i,1-i])", "warning", "only showing real part of complex image"); |
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274 %! unwind_protect_cleanup |
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275 %! close (hf); |
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276 %! end_unwind_protect |
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277 |