Mercurial > octave-nkf
annotate scripts/image/colormap.m @ 17744:d63878346099
maint: Update copyright notices for release.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 23 Oct 2013 22:09:27 -0400 |
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children | 446c46af4b42 |
rev | line source |
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1 ## Copyright (C) 1994-2013 John W. Eaton |
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2 ## Copyright (C) 2012 Carnë Draug |
2313 | 3 ## |
4 ## This file is part of Octave. | |
5 ## | |
6 ## Octave is free software; you can redistribute it and/or modify it | |
7 ## under the terms of the GNU General Public License as published by | |
7016 | 8 ## the Free Software Foundation; either version 3 of the License, or (at |
9 ## your option) any later version. | |
2313 | 10 ## |
11 ## Octave is distributed in the hope that it will be useful, but | |
12 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 ## General Public License for more details. | |
15 ## | |
16 ## You should have received a copy of the GNU General Public License | |
7016 | 17 ## along with Octave; see the file COPYING. If not, see |
18 ## <http://www.gnu.org/licenses/>. | |
1024 | 19 |
3381 | 20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {@var{cmap} =} colormap () |
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22 ## @deftypefnx {Function File} {@var{cmap} =} colormap (@var{map}) |
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23 ## @deftypefnx {Function File} {@var{cmap} =} colormap ("default") |
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24 ## @deftypefnx {Function File} {@var{cmap} =} colormap ("@var{map_name}") |
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25 ## @deftypefnx {Function File} {@var{cmap} =} colormap (@var{hax}, @dots{}) |
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26 ## @deftypefnx {Command} {} colormap @var{map_name} |
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27 ## @deftypefnx {Function File} {@var{cmaps} =} colormap ("list") |
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28 ## @deftypefnx {Function File} {} colormap ("register", "@var{name}") |
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29 ## @deftypefnx {Function File} {} colormap ("unregister", "@var{name}") |
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30 ## Query or set the current colormap. |
3426 | 31 ## |
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32 ## With no input arguments, @code{colormap} returns the current color map. |
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33 ## |
3373 | 34 ## @code{colormap (@var{map})} sets the current colormap to @var{map}. The |
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35 ## colormap should be an @var{n} row by 3 column matrix. The columns |
3373 | 36 ## contain red, green, and blue intensities respectively. All entries |
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37 ## must be between 0 and 1 inclusive. The new colormap is returned. |
3426 | 38 ## |
6895 | 39 ## @code{colormap ("default")} restores the default colormap (the |
40 ## @code{jet} map with 64 entries). The default colormap is returned. | |
3426 | 41 ## |
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42 ## The map may also be specified by a string, @qcode{"@var{map_name}"}, where |
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43 ## @var{map_name} is the name of a function that returns a colormap. |
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44 ## |
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45 ## If the first argument @var{hax} is an axes handle, then the colormap for |
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46 ## the parent figure of @var{hax} is queried or set. |
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47 ## |
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48 ## For convenience, it is also possible to use this function with the |
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49 ## command form, @code{colormap @var{map_name}}. |
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50 ## |
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51 ## @code{colormap ("list")} returns a cell array with all of the available |
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52 ## colormaps. The options @qcode{"register"} and @qcode{"unregister"} |
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53 ## add or remove the colormap @var{name} from this list. |
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54 ## |
6895 | 55 ## @seealso{jet} |
3373 | 56 ## @end deftypefn |
559 | 57 |
3202 | 58 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
2312 | 59 ## Created: July 1994 |
60 ## Adapted-By: jwe | |
904 | 61 |
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62 function cmap = colormap (varargin) |
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63 persistent map_list = cell (); |
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64 |
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65 [hax, varargin, nargin] = __plt_get_axis_arg__ ("colormap", varargin{:}); |
559 | 66 |
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67 if (nargin > 2) |
5923 | 68 print_usage (); |
1062 | 69 endif |
559 | 70 |
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71 if (! isempty (hax)) |
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72 cf = ancestor (hax, "figure"); |
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73 else |
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74 cf = get (0, "currentfigure"); |
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75 endif |
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76 |
1024 | 77 if (nargin == 1) |
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78 map = varargin{1}; |
5443 | 79 if (ischar (map)) |
1024 | 80 if (strcmp (map, "default")) |
6895 | 81 map = jet (64); |
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82 elseif (strcmp (map, "list")) |
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83 cmap = map_list; |
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84 return; |
559 | 85 else |
6257 | 86 map = feval (map); |
559 | 87 endif |
3238 | 88 endif |
89 | |
90 if (! isempty (map)) | |
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91 if (! (isnumeric (map) && isreal (map) |
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92 && ndims (map) == 2 && columns (map) == 3)) |
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93 error ("colormap: MAP must be a real-valued N x 3 ([R,G,B]) matrix"); |
3238 | 94 endif |
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95 if (any (map(:) < 0) || any (map(:) > 1)) |
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96 error ("colormap: all MAP values must be in the range [0,1]"); |
3238 | 97 endif |
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98 if (isempty (cf)) |
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99 cf = gcf (); |
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100 endif |
2303 | 101 ## Set the new color map |
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102 set (cf, "colormap", map); |
559 | 103 endif |
3238 | 104 |
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105 elseif (nargin == 2) |
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106 opt = varargin{1}; |
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107 name = varargin{2}; |
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108 if (! ischar (opt) || ! any (strcmp (opt, {"register", "unregister"}))) |
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109 print_usage (); |
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110 elseif (! ischar (name)) |
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111 error ("colormap: to register/unregister a colormap, NAME must be a string"); |
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112 elseif (strcmp (opt, "register")) |
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113 map_list{end+1} = name; |
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114 elseif (strcmp (opt, "unregister")) |
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115 map_list(strcmp (name, map_list)) = []; |
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116 endif |
559 | 117 endif |
118 | |
2303 | 119 ## Return current color map. |
7108 | 120 if (nargout > 0 || (nargout == 0 && nargin == 0)) |
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121 if (isempty (cf)) |
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122 cf = gcf (); |
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123 endif |
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124 cmap = get (cf, "colormap"); |
6762 | 125 endif |
1024 | 126 |
559 | 127 endfunction |
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128 |
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129 |
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130 %!demo |
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131 %! ## Create an image for displaying a colormap |
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132 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); |
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133 %! axis ([1, 64, 0, 1], "ticy", "xy"); |
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134 %! ## Show 'jet' colormap |
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135 %! colormap (jet (64)); |
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136 %! title "colormap (jet (64))" |
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137 %! disp ("Press a key to continue"); |
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138 %! pause (); |
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139 %! ## Show 'colorcube' colormap |
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140 %! colormap (colorcube (64)); |
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141 %! title "colormap (colorcube (64))" |
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142 |
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143 %!test |
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144 %! hf = figure ("visible", "off"); |
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145 %! cmaptst = [0 1 0; 1 0 1; 1 1 1]; |
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146 %! cmap = colormap (cmaptst); |
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147 %! assert (cmap, cmaptst); |
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148 %! cmap = colormap (); |
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149 %! assert (cmap, cmaptst); |
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150 %! cmap = (get (gcf, "colormap")); |
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151 %! assert (cmap, cmaptst); |
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152 %! colormap ("default"); |
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153 %! assert (colormap (), jet (64)); |
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154 %! colormap ("ocean"); |
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155 %! assert (colormap, ocean (64)); |
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156 %! close (hf); # done with temp. figure |
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157 |
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158 %!test |
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159 %! cmaplst = colormap ("list"); |
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160 %! assert (iscell (cmaplst)); |
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161 %! colormap ("register", "__mycmap__"); |
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162 %! cmaplst2 = colormap ("list"); |
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163 %! assert (numel (cmaplst2), numel (cmaplst) + 1); |
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164 %! assert (any (strcmp (cmaplst2, "__mycmap__"))); |
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165 %! colormap ("unregister", "__mycmap__"); |
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166 %! cmaplst2 = colormap ("list"); |
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167 %! assert (numel (cmaplst2), numel (cmaplst)); |
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168 %! assert (! any (strcmp (cmaplst2, "__mycmap__"))); |
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169 %! ## Unregister again and verify that nothing has happened |
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170 %! colormap ("unregister", "__mycmap__"); |
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171 %! cmaplst3 = colormap ("list"); |
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172 %! assert (isequal (cmaplst2, cmaplst3)); |
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173 |
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174 ## Test input validation |
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175 %!error colormap (1,2,3) |
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176 %!error <MAP must be a real-valued N x 3> colormap ({1,2,3}) |
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177 %!error <MAP must be a real-valued N x 3> colormap ([1 i 1]) |
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178 %!error <MAP must be a real-valued N x 3> colormap (ones(3,3,3)) |
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179 %!error <MAP must be a real-valued N x 3> colormap ([1 0 1 0]) |
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180 %!error <all MAP values must be in the range> colormap ([-1 0 0]) |
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181 %!error <all MAP values must be in the range> colormap ([2 0 0]) |
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182 %!error colormap ("invalid", "name") |
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183 %!error <NAME must be a string> colormap ("register", 1) |
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184 |