Mercurial > octave
annotate scripts/plot/legend.m @ 10666:7a43499f074a
legend.m: Improve documentation string
| author | Rik <octave@nomad.inbox5.com> |
|---|---|
| date | Wed, 26 May 2010 20:23:16 -0700 |
| parents | 3afcd24ced61 |
| children | 693e22af08ae |
| rev | line source |
|---|---|
| 8920 | 1 ## Copyright (C) 2001, 2006, 2007, 2008, 2009 Laurent Mazet |
| 6146 | 2 ## Copyright (C) 2006 John W. Eaton |
| 3 ## | |
| 6440 | 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. | |
| 6440 | 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. | |
| 6146 | 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/>. | |
| 6146 | 19 |
| 20 ## -*- texinfo -*- | |
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21 ## @deftypefn {Function File} {} legend (@var{str1}, @var{str2}, @dots{}) |
| 6146 | 22 ## @deftypefnx {Function File} {} legend (@var{matstr}) |
| 23 ## @deftypefnx {Function File} {} legend (@var{cell}) | |
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24 ## @deftypefnx {Function File} {} legend (@dots{}, "location", @var{pos}) |
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25 ## @deftypefnx {Function File} {} legend (@var{hax}, @dots{}) |
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26 ## @deftypefnx {Function File} {} legend (@var{hobjs}, @dots{}) |
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27 ## @deftypefnx {Function File} {} legend (@var{hax}, @var{hobjs}, @dots{}) |
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28 ## @deftypefnx {Function File} {} legend ("@var{option}") |
| 6146 | 29 ## |
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30 ## Display a legend for the axes with handle @var{hax}, or the current axes, |
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31 ## using the specified strings as labels. Legend entries may be specified |
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32 ## as individual character string arguments, a character array, or a cell |
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33 ## array of character strings. If the handles, @var{hobjs}, are not specified |
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34 ## then the legend's strings will be associated with the axes' descendants. |
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35 ## Legend works on line graphs, bar graphs, etc. |
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36 ## A plot must exist before legend is called. |
| 6146 | 37 ## |
| 6895 | 38 ## The optional parameter @var{pos} specifies the location of the legend |
| 39 ## as follows: | |
| 6146 | 40 ## |
| 6977 | 41 ## @multitable @columnfractions 0.06 0.14 0.80 |
| 42 ## @item @tab north @tab | |
| 43 ## center top | |
| 44 ## @item @tab south @tab | |
| 45 ## center bottom | |
| 46 ## @item @tab east @tab | |
| 47 ## right center | |
| 48 ## @item @tab west @tab | |
| 49 ## left center | |
| 50 ## @item @tab northeast @tab | |
| 51 ## right top (default) | |
| 52 ## @item @tab northwest @tab | |
| 53 ## left top | |
| 54 ## @item @tab southeast @tab | |
| 55 ## right bottom | |
| 56 ## @item @tab southwest @tab | |
| 57 ## left bottom | |
| 58 ## @item | |
| 59 ## @item @tab outside @tab | |
| 60 ## can be appended to any location string | |
| 6146 | 61 ## @end multitable |
| 62 ## | |
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63 ## The following customizations are available using @var{option}: |
| 6146 | 64 ## |
| 7148 | 65 ## @table @asis |
| 6895 | 66 ## @item "show" |
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67 ## Show legend on the plot |
| 6895 | 68 ## @item "hide" |
| 7148 | 69 ## @itemx "off" |
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70 ## Hide legend on the plot |
| 6895 | 71 ## @item "boxon" |
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72 ## Show a box around legend |
| 6895 | 73 ## @item "boxoff" |
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74 ## Hide the box around legend |
| 6895 | 75 ## @item "left" |
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76 ## Place text to the left of the keys |
| 6895 | 77 ## @item "right" |
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78 ## Place text to the right of the keys |
| 6146 | 79 ## @end table |
| 80 ## @end deftypefn | |
| 81 | |
| 82 function legend (varargin) | |
| 83 | |
| 8208 | 84 [ca, varargin, nargin] = __plt_get_axis_arg__ ("legend", varargin{:}); |
| 6257 | 85 nargs = nargin; |
| 6146 | 86 |
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87 if (all (ishandle (varargin{1}))) |
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88 kids = flipud (varargin{1}(:)); |
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89 varargin(1) = []; |
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90 nargs = numel (varargin); |
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91 else |
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92 kids = get (ca, "children"); |
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93 endif |
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94 nkids = numel (kids); |
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95 |
| 6146 | 96 if (nargs > 0) |
| 97 pos = varargin{nargs}; | |
| 98 if (isnumeric (pos) && isscalar (pos) && round (pos) == pos) | |
| 6395 | 99 if (pos >= -1 && pos <= 4) |
| 10549 | 100 set (ca, "keypos", pos); |
| 101 nargs--; | |
| 6146 | 102 else |
| 10549 | 103 error ("legend: invalid position specified"); |
| 6146 | 104 endif |
| 105 endif | |
| 106 endif | |
| 6977 | 107 |
| 108 if (nargs > 1) | |
| 109 pos = varargin{nargs-1}; | |
| 7054 | 110 str = varargin{nargs}; |
| 6977 | 111 if (strcmpi (pos, "location") && ischar (str)) |
| 112 set (ca, "keypos", str); | |
| 113 nargs -= 2; | |
| 114 endif | |
| 115 endif | |
| 6146 | 116 |
| 6257 | 117 k = 1; |
| 118 turn_on_legend = false; | |
| 119 | |
| 6146 | 120 if (nargs == 1) |
| 121 arg = varargin{1}; | |
| 122 if (ischar (arg)) | |
| 123 if (rows (arg) == 1) | |
| 10549 | 124 str = tolower (deblank (arg)); |
| 125 switch (str) | |
| 126 case {"off", "hide"} | |
| 127 set (ca, "key", "off"); | |
| 128 nargs--; | |
| 129 case "show" | |
| 130 set (ca, "key", "on"); | |
| 131 nargs--; | |
| 132 case "toggle" | |
| 133 val = get (ca, "key"); | |
| 134 if (strcmpi (val, "on")) | |
| 135 set (ca, "key", "off"); | |
| 136 else | |
| 137 set (ca, "key", "on"); | |
| 138 endif | |
| 139 nargs--; | |
| 140 case "boxon" | |
| 141 set (ca, "key", "on", "keybox", "on"); | |
| 142 nargs--; | |
| 143 case "boxoff" | |
| 144 set (ca, "keybox", "off"); | |
| 145 nargs--; | |
| 146 case "left" | |
| 147 set (ca, "keyreverse", "off") | |
| 148 nargs--; | |
| 149 case "right" | |
| 150 set (ca, "keyreverse", "on") | |
| 151 nargs--; | |
| 152 otherwise | |
| 153 endswitch | |
| 6146 | 154 else |
| 10549 | 155 varargin = cellstr (arg); |
| 156 nargs = numel (varargin); | |
| 6146 | 157 endif |
| 158 elseif (iscellstr (arg)) | |
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159 varargin = arg; |
| 6146 | 160 nargs = numel (varargin); |
| 161 else | |
| 162 error ("legend: expecting argument to be a character string"); | |
| 163 endif | |
| 164 endif | |
| 165 | |
| 6272 | 166 if (nargs > 0) |
| 167 have_data = false; | |
| 9451 | 168 for k = 1:nkids |
| 169 typ = get (kids(k), "type"); | |
| 170 if (strcmp (typ, "line") || strcmp (typ, "surface") | |
| 10549 | 171 || strcmp (typ, "patch") || strcmp (typ, "hggroup")) |
| 172 have_data = true; | |
| 173 break; | |
| 6272 | 174 endif |
| 175 endfor | |
| 176 if (! have_data) | |
| 177 warning ("legend: plot data is empty; setting key labels has no effect"); | |
| 178 endif | |
| 6147 | 179 endif |
| 180 | |
| 6575 | 181 warned = false; |
| 9451 | 182 k = nkids; |
| 183 for i = 1:nargs | |
| 6146 | 184 arg = varargin{i}; |
| 185 if (ischar (arg)) | |
| 9451 | 186 typ = get (kids(k), "type"); |
| 187 while (k > 1 | |
| 10549 | 188 && ! (strcmp (typ, "line") || strcmp (typ, "surface") |
| 189 || strcmp (typ, "patch") || strcmp (typ, "hggroup"))) | |
| 190 typ = get (kids(--k), "type"); | |
| 6257 | 191 endwhile |
| 9451 | 192 if (k > 0) |
| 10549 | 193 if (strcmp (get (kids(k), "type"), "hggroup")) |
| 194 hgkids = get (kids(k), "children"); | |
| 195 for j = 1 : length (hgkids) | |
| 196 hgobj = get (hgkids (j)); | |
| 197 if (isfield (hgobj, "keylabel")) | |
| 198 set (hgkids(j), "keylabel", arg); | |
| 199 break; | |
| 200 endif | |
| 201 endfor | |
| 202 else | |
| 203 set (kids(k), "keylabel", arg); | |
| 204 endif | |
| 205 turn_on_legend = true; | |
| 206 if (--k == 0) | |
| 207 break; | |
| 208 endif | |
| 6257 | 209 elseif (! warned) |
| 10549 | 210 warned = true; |
| 211 warning ("legend: ignoring extra labels"); | |
| 6257 | 212 endif |
| 6146 | 213 else |
| 214 error ("legend: expecting argument to be a character string"); | |
| 215 endif | |
| 216 endfor | |
| 217 | |
| 6257 | 218 if (turn_on_legend) |
| 219 set (ca, "key", "on"); | |
| 6146 | 220 endif |
| 221 | |
| 222 endfunction | |
| 223 | |
| 224 %!demo | |
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225 %! clf |
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226 %! plot(1:10, 1:10, 1:10, fliplr(1:10)); |
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227 %! title("incline is blue and decline is green"); |
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228 %! legend({"I'm blue", "I'm green"}, "location", "east") |
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229 |
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230 %!demo |
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231 %! clf |
| 9451 | 232 %! plot(1:10, 1:10, 1:10, fliplr(1:10)); |
| 233 %! title("incline is blue and decline is green"); | |
| 234 %! legend("I'm blue", "I'm green", "location", "east") | |
| 235 | |
| 236 %!demo | |
| 237 %! clf | |
| 6146 | 238 %! plot(1:10, 1:10); |
| 239 %! title("a very long label can sometimes cause problems"); | |
| 6977 | 240 %! legend({"hello world"}, "location", "northeastoutside") |
| 6146 | 241 |
| 242 %!demo | |
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243 %! clf |
| 9451 | 244 %! plot(1:10, 1:10); |
| 245 %! title("a very long label can sometimes cause problems"); | |
| 246 %! legend("hello world", "location", "northeastoutside") | |
| 247 | |
| 248 %!demo | |
| 249 %! clf | |
| 6146 | 250 %! labels = {}; |
| 251 %! for i = 1:5 | |
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252 %! h = plot(1:100, i + rand(100,1)); hold on; |
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253 %! set (h, "color", get (gca, "colororder")(i,:)) |
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254 %! labels = {labels{:}, cstrcat("Signal ", num2str(i))}; |
| 6146 | 255 %! endfor; hold off; |
| 256 %! title("Signals with random offset and uniform noise") | |
| 257 %! xlabel("Sample Nr [k]"); ylabel("Amplitude [V]"); | |
| 6977 | 258 %! legend(labels, "location", "southoutside") |
| 6146 | 259 %! legend("boxon") |
| 9451 | 260 |
| 261 %!demo | |
| 262 %! clf | |
| 263 %! labels = {}; | |
| 264 %! for i = 1:5 | |
| 265 %! h = plot(1:100, i + rand(100,1)); hold on; | |
| 266 %! set (h, "color", get (gca, "colororder")(i,:)) | |
| 267 %! labels = {labels{:}, cstrcat("Signal ", num2str(i))}; | |
| 268 %! endfor; hold off; | |
| 269 %! title("Signals with random offset and uniform noise") | |
| 270 %! xlabel("Sample Nr [k]"); ylabel("Amplitude [V]"); | |
| 271 %! legend(labels{:}, "location", "southoutside") | |
| 272 %! legend("boxon") | |
| 273 | |
| 274 %!demo | |
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275 %! clf |
| 9451 | 276 %! x = linspace (0, 10); |
| 277 %! plot (x, x); | |
| 278 %! hold ("on"); | |
| 279 %! stem (x, x.^2, 'g') | |
| 280 %! legend ("linear"); | |
| 281 %! hold ("off"); | |
| 282 | |
| 283 %!demo | |
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284 %! clf |
| 9451 | 285 %! x = linspace (0, 10); |
| 286 %! plot (x, x, x, x.^2); | |
| 287 %! legend ("linear"); | |
| 288 | |
| 289 %!demo | |
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290 %! clf |
| 9451 | 291 %! x = linspace (0, 10); |
| 292 %! plot (x, x, x, x.^2); | |
| 293 %! legend ("linear", "quadratic"); | |
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294 |
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295 %!demo |
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296 %! clf |
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297 %! bar (rand (2, 3)) |
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298 %! ylim ([0 1.2]) |
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299 %! legend ({"1st Bar", "2nd Bar", "3rd Bar"}) |
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300 |
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301 %!demo |
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302 %! clf |
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303 %! bar (rand (2, 3)) |
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304 %! ylim ([0 1.2]) |
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305 %! legend ("1st Bar", "2nd Bar", "3rd Bar") |
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306 |
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307 %!demo |
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308 %! clf |
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309 %! x = 0:0.1:7; |
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changeset
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310 %! h = plot (x, sin(x), x, cos(x), x, sin(x.^2/10), x, cos(x.^2/10)); |
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3afcd24ced61
legend.m: Key labels for specified objects.
Ben Abbott <bpabbott@mac.com>
parents:
10549
diff
changeset
|
311 %! title ("Only the sin() objects have keylabels") |
|
3afcd24ced61
legend.m: Key labels for specified objects.
Ben Abbott <bpabbott@mac.com>
parents:
10549
diff
changeset
|
312 %! legend (h([1, 3]), {"sin(x)", "sin(x^2/10)"}, "location", "southwest") |