Mercurial > octave
annotate scripts/image/colormap.m @ 23083:e9a0469dedd9 stable
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author | John W. Eaton <jwe@octave.org> |
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date | Fri, 20 Jan 2017 12:19:08 -0500 |
parents | c44d57c0a925 |
children | ef4d915df748 3ac9f9ecfae5 |
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1 ## Copyright (C) 1994-2016 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 {} {@var{cmap} =} colormap () |
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22 ## @deftypefnx {} {@var{cmap} =} colormap (@var{map}) |
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23 ## @deftypefnx {} {@var{cmap} =} colormap (@qcode{"default"}) |
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24 ## @deftypefnx {} {@var{cmap} =} colormap (@var{map_name}) |
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25 ## @deftypefnx {} {@var{cmap} =} colormap (@var{hax}, @dots{}) |
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26 ## @deftypefnx {} {} colormap @var{map_name} |
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27 ## Query or set the current colormap. |
3426 | 28 ## |
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29 ## With no input arguments, @code{colormap} returns the current color map. |
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30 ## |
3373 | 31 ## @code{colormap (@var{map})} sets the current colormap to @var{map}. The |
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32 ## colormap should be an @var{n} row by 3 column matrix. The columns |
3373 | 33 ## contain red, green, and blue intensities respectively. All entries |
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34 ## must be between 0 and 1 inclusive. The new colormap is returned. |
3426 | 35 ## |
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36 ## @code{colormap (@qcode{"default"})} restores the default colormap (the |
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37 ## @code{viridis} map with 64 entries). The default colormap is returned. |
3426 | 38 ## |
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39 ## The map may also be specified by a string, @var{map_name}, which |
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40 ## is the name of a function that returns a colormap. |
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41 ## |
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42 ## If the first argument @var{hax} is an axes handle, then the colormap for |
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43 ## the parent figure of @var{hax} is queried or set. |
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44 ## |
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45 ## For convenience, it is also possible to use this function with the |
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46 ## command form, @code{colormap @var{map_name}}. |
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47 ## |
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48 ## The list of built-in colormaps is: |
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49 ## |
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50 ## @c FIXME: It would be nice to display the actual colormap as an image |
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51 ## @c in the PDF version of the documentation. |
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52 ## @multitable @columnfractions 0.15 .85 |
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53 ## @headitem Map @tab Description |
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54 ## @item viridis @tab default |
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55 ## @item jet @tab colormap traversing blue, cyan, green, yellow, red. |
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56 ## @item cubehelix @tab colormap traversing black, blue, green, red, white with increasing intensity. |
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57 ## @item hsv @tab cyclic colormap traversing Hue, Saturation, Value space. |
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58 ## @item rainbow @tab colormap traversing red, yellow, blue, green, violet. |
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59 ## @item ------------- @tab --------------------------------------------------------------------------------------------- |
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60 ## @item hot @tab colormap traversing black, red, orange, yellow, white. |
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61 ## @item cool @tab colormap traversing cyan, purple, magenta. |
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62 ## @item spring @tab colormap traversing magenta to yellow. |
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63 ## @item summer @tab colormap traversing green to yellow. |
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64 ## @item autumn @tab colormap traversing red, orange, yellow. |
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65 ## @item winter @tab colormap traversing blue to green. |
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66 ## @item ------------- @tab --------------------------------------------------------------------------------------------- |
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67 ## @item gray @tab colormap traversing black to white in shades of gray. |
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68 ## @item bone @tab colormap traversing black, gray-blue, white. |
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69 ## @item copper @tab colormap traversing black to light copper. |
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70 ## @item pink @tab colormap traversing black, gray-pink, white. |
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71 ## @item ocean @tab colormap traversing black, dark-blue, white. |
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72 ## @item ------------- @tab --------------------------------------------------------------------------------------------- |
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73 ## @item colorcube @tab equally spaced colors in RGB color space. |
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74 ## @item flag @tab cyclic 4-color map of red, white, blue, black. |
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75 ## @item lines @tab cyclic colormap with colors from axes @qcode{"ColorOrder"} property. |
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76 ## @item prism @tab cyclic 6-color map of red, orange, yellow, green, blue, violet. |
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77 ## @item ------------- @tab --------------------------------------------------------------------------------------------- |
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78 ## @item white @tab all white colormap (no colors). |
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79 ## @end multitable |
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80 ## @seealso{viridis, jet, cubehelix, hsv, rainbow, hot, cool, spring, summer, autumn, winter, gray, bone, copper, pink, ocean, colorcube, flag, lines, prism, white} |
3373 | 81 ## @end deftypefn |
559 | 82 |
3202 | 83 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
2312 | 84 ## Created: July 1994 |
85 ## Adapted-By: jwe | |
904 | 86 |
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87 function cmap = colormap (varargin) |
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88 |
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89 [hax, varargin, nargin] = __plt_get_axis_arg__ ("colormap", varargin{:}); |
559 | 90 |
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91 if (nargin > 1) |
5923 | 92 print_usage (); |
1062 | 93 endif |
559 | 94 |
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95 if (! isempty (hax)) |
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96 cf = ancestor (hax, "figure"); |
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97 else |
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98 cf = get (0, "currentfigure"); |
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99 endif |
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100 |
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102 map = varargin{1}; |
5443 | 103 if (ischar (map)) |
1024 | 104 if (strcmp (map, "default")) |
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105 map = viridis (64); |
559 | 106 else |
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107 try |
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108 map = feval (map); |
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109 catch |
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110 error ("colormap: failed to set MAP <%s>", map); |
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111 end_try_catch |
559 | 112 endif |
3238 | 113 endif |
114 | |
115 if (! isempty (map)) | |
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116 if (! (isnumeric (map) && isreal (map) |
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117 && ndims (map) == 2 && columns (map) == 3)) |
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118 error ("colormap: MAP must be a real-valued N x 3 ([R,G,B]) matrix"); |
3238 | 119 endif |
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120 if (any (map(:) < 0) || any (map(:) > 1)) |
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121 error ("colormap: all MAP values must be in the range [0,1]"); |
3238 | 122 endif |
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123 if (isempty (cf)) |
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124 cf = gcf (); |
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125 endif |
2303 | 126 ## Set the new color map |
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127 set (cf, "colormap", map); |
559 | 128 endif |
129 endif | |
130 | |
2303 | 131 ## Return current color map. |
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132 if (nargout > 0 || nargin == 0) |
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133 if (isempty (cf)) |
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134 cf = gcf (); |
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135 endif |
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136 cmap = get (cf, "colormap"); |
6762 | 137 endif |
1024 | 138 |
559 | 139 endfunction |
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140 |
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141 |
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142 %!demo |
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143 %! ## Create an image for displaying a colormap |
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144 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); |
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145 %! axis ([1, 64, 0, 1], "ticy", "xy"); |
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146 %! ## Show 'viridis' colormap |
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147 %! colormap (viridis (64)); |
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148 %! title "colormap (viridis (64))" |
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149 %! disp ("Press a key to continue"); |
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150 %! pause (); |
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151 %! ## Show 'colorcube' colormap |
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152 %! colormap (colorcube (64)); |
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153 %! title "colormap (colorcube (64))" |
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154 |
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155 %!test |
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156 %! hf = figure ("visible", "off"); |
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157 %! unwind_protect |
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158 %! cmaptst = [0 1 0; 1 0 1; 1 1 1]; |
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159 %! cmap = colormap (cmaptst); |
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160 %! assert (cmap, cmaptst); |
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161 %! cmap = colormap (); |
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162 %! assert (cmap, cmaptst); |
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163 %! cmap = (get (gcf, "colormap")); |
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164 %! assert (cmap, cmaptst); |
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165 %! colormap ("default"); |
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166 %! assert (colormap (), viridis (64)); |
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167 %! colormap ("ocean"); |
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168 %! assert (colormap, ocean (64)); |
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169 %! unwind_protect_cleanup |
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170 %! close (hf); |
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171 %! end_unwind_protect |
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172 |
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173 ## Test input validation |
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174 %!error colormap (1,2,3) |
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175 %!error <MAP must be a real-valued N x 3> colormap ({1,2,3}) |
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176 %!error <MAP must be a real-valued N x 3> colormap ([1 i 1]) |
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177 %!error <MAP must be a real-valued N x 3> colormap (ones(3,3,3)) |
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178 %!error <MAP must be a real-valued N x 3> colormap ([1 0 1 0]) |
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179 %!error <all MAP values must be in the range> colormap ([-1 0 0]) |
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180 %!error <all MAP values must be in the range> colormap ([2 0 0]) |
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181 %!error <failed to set MAP .invalid_map_name.> colormap ("invalid_map_name") |