Mercurial > octave-nkf
comparison scripts/image/gray.m @ 19647:e8e3a89fa370
Fix colormap functions when N is not of class double (bug #44070)
* autumn.m, bone.m, cool.m, copper.m, cubehelix.m, gray.m, hsv.m, ocean.m,
rainbow.m, spring.m, summer.m, winter.m: cast N to double since in this
colormap functions, N is used directly used in the operations and ends up
casting colormap to something else. Note that a colormap MUST be of class
double. Also, if N is an integer class, all values in colormap end up 0
or 1. Also simplify code for input checking by declaring default on function
signature line.
* flag.m, gmap40.m, hot.m, jet.m, lines.m, pink.m, prism.m, white.m: simplify
input check like the other colormap functions.
* test/colormaps.tst: add new test file to test all colormaps at once.
* test/Makefile.am: add new test file to build system.
used to create the colormap and if less
author | Carnë Draug <carandraug@octave.org> |
---|---|
date | Fri, 23 Jan 2015 15:37:56 +0000 |
parents | d63878346099 |
children | 4197fc428c7d |
comparison
equal
deleted
inserted
replaced
19646:68cc16969f78 | 19647:e8e3a89fa370 |
---|---|
31 ## Adapted-By: jwe | 31 ## Adapted-By: jwe |
32 | 32 |
33 ## PKG_ADD: colormap ("register", "gray"); | 33 ## PKG_ADD: colormap ("register", "gray"); |
34 ## PKG_DEL: colormap ("unregister", "gray"); | 34 ## PKG_DEL: colormap ("unregister", "gray"); |
35 | 35 |
36 function map = gray (n) | 36 function map = gray (n = rows (colormap ())) |
37 | 37 |
38 if (nargin == 0) | 38 if (nargin > 1) |
39 n = rows (colormap); | |
40 elseif (nargin == 1) | |
41 if (! isscalar (n)) | |
42 error ("gray: N must be a scalar"); | |
43 endif | |
44 else | |
45 print_usage (); | 39 print_usage (); |
40 elseif (! isscalar (n)) | |
41 error ("gray: N must be a scalar"); | |
46 endif | 42 endif |
43 n = double (n); | |
47 | 44 |
48 if (n == 1) | 45 if (n == 1) |
49 map = [0, 0, 0]; | 46 map = [0, 0, 0]; |
50 elseif (n > 1) | 47 elseif (n > 1) |
51 gr = [0:(n-1)]' / (n - 1); | 48 gr = [0:(n-1)]' / (n - 1); |
54 map = zeros (0, 3); | 51 map = zeros (0, 3); |
55 endif | 52 endif |
56 | 53 |
57 endfunction | 54 endfunction |
58 | 55 |
59 | |
60 %!demo | 56 %!demo |
61 %! ## Show the 'gray' colormap as an image | 57 %! ## Show the 'gray' colormap as an image |
62 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); | 58 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); |
63 %! axis ([1, 64, 0, 1], "ticy", "xy"); | 59 %! axis ([1, 64, 0, 1], "ticy", "xy"); |
64 %! colormap (gray (64)); | 60 %! colormap (gray (64)); |