Mercurial > octave
view scripts/image/viridis.m @ 21563:1fc6ae99c792
viridis.m: Clean up code to more closely follow other colormaps.
* viridis.m: Use same language in docstring to describe colormap. Use 'map' as
return variable. Declare internal variable viridi as persistent since it is
large and potentially used frequently now that it is the default colormap.
Use two newlines between endfunction and start of any %!demo or %!test blocks.
author | Rik <rik@octave.org> |
---|---|
date | Wed, 30 Mar 2016 15:34:05 -0700 |
parents | 516bb87ea72e |
children | 894239974868 |
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## Copyright (C) 2015 Eric Firing ## Copyright (C) 2015 Nathaniel J. Smith ## Copyright (C) 2015 Stefan van der Walt ## Copyright (C) 2015 Carlo de Falco ## ## This file is part of Octave. ## ## Octave is free software; you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 3 of the License, or (at ## your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {} {@var{map} =} viridis () ## @deftypefnx {} {@var{map} =} viridis (@var{n}) ## Create color colormap. This colormap ranges from dark purplish-blue through ## blue, green, to yellow. ## ## The argument @var{n} must be a scalar. ## If unspecified, the length of the current colormap, or 64, is used. ## @seealso{colormap} ## @end deftypefn ## Author: Carlo de Falco ## PKG_ADD: colormap ("register", "viridis"); ## PKG_DEL: colormap ("unregister", "viridis"); ## This is a port to Octave of the default matplotlib colormap "viridis" ## by Eric Firing. The original file is distributed under CC0: ## http://creativecommons.org/publicdomain/zero/1.0 function map = viridis (n = rows (colormap ())) if (nargin > 1) print_usage (); elseif (! isscalar (n)) error ("viridis: N must be a scalar"); endif ## FIXME: Is there no algorithmic definition of the viridis colormap? persistent viridi = [0.26700401 0.00487433 0.32941519 0.26851048 0.00960483 0.33542652 0.26994384 0.01462494 0.34137895 0.27130489 0.01994186 0.34726862 0.27259384 0.02556309 0.35309303 0.27380934 0.03149748 0.35885256 0.27495242 0.03775181 0.36454323 0.27602238 0.04416723 0.37016418 0.2770184 0.05034437 0.37571452 0.27794143 0.05632444 0.38119074 0.27879067 0.06214536 0.38659204 0.2795655 0.06783587 0.39191723 0.28026658 0.07341724 0.39716349 0.28089358 0.07890703 0.40232944 0.28144581 0.0843197 0.40741404 0.28192358 0.08966622 0.41241521 0.28232739 0.09495545 0.41733086 0.28265633 0.10019576 0.42216032 0.28291049 0.10539345 0.42690202 0.28309095 0.11055307 0.43155375 0.28319704 0.11567966 0.43611482 0.28322882 0.12077701 0.44058404 0.28318684 0.12584799 0.44496 0.283072 0.13089477 0.44924127 0.28288389 0.13592005 0.45342734 0.28262297 0.14092556 0.45751726 0.28229037 0.14591233 0.46150995 0.28188676 0.15088147 0.46540474 0.28141228 0.15583425 0.46920128 0.28086773 0.16077132 0.47289909 0.28025468 0.16569272 0.47649762 0.27957399 0.17059884 0.47999675 0.27882618 0.1754902 0.48339654 0.27801236 0.18036684 0.48669702 0.27713437 0.18522836 0.48989831 0.27619376 0.19007447 0.49300074 0.27519116 0.1949054 0.49600488 0.27412802 0.19972086 0.49891131 0.27300596 0.20452049 0.50172076 0.27182812 0.20930306 0.50443413 0.27059473 0.21406899 0.50705243 0.26930756 0.21881782 0.50957678 0.26796846 0.22354911 0.5120084 0.26657984 0.2282621 0.5143487 0.2651445 0.23295593 0.5165993 0.2636632 0.23763078 0.51876163 0.26213801 0.24228619 0.52083736 0.26057103 0.2469217 0.52282822 0.25896451 0.25153685 0.52473609 0.25732244 0.2561304 0.52656332 0.25564519 0.26070284 0.52831152 0.25393498 0.26525384 0.52998273 0.25219404 0.26978306 0.53157905 0.25042462 0.27429024 0.53310261 0.24862899 0.27877509 0.53455561 0.2468114 0.28323662 0.53594093 0.24497208 0.28767547 0.53726018 0.24311324 0.29209154 0.53851561 0.24123708 0.29648471 0.53970946 0.23934575 0.30085494 0.54084398 0.23744138 0.30520222 0.5419214 0.23552606 0.30952657 0.54294396 0.23360277 0.31382773 0.54391424 0.2316735 0.3181058 0.54483444 0.22973926 0.32236127 0.54570633 0.22780192 0.32659432 0.546532 0.2258633 0.33080515 0.54731353 0.22392515 0.334994 0.54805291 0.22198915 0.33916114 0.54875211 0.22005691 0.34330688 0.54941304 0.21812995 0.34743154 0.55003755 0.21620971 0.35153548 0.55062743 0.21429757 0.35561907 0.5511844 0.21239477 0.35968273 0.55171011 0.2105031 0.36372671 0.55220646 0.20862342 0.36775151 0.55267486 0.20675628 0.37175775 0.55311653 0.20490257 0.37574589 0.55353282 0.20306309 0.37971644 0.55392505 0.20123854 0.38366989 0.55429441 0.1994295 0.38760678 0.55464205 0.1976365 0.39152762 0.55496905 0.19585993 0.39543297 0.55527637 0.19410009 0.39932336 0.55556494 0.19235719 0.40319934 0.55583559 0.19063135 0.40706148 0.55608907 0.18892259 0.41091033 0.55632606 0.18723083 0.41474645 0.55654717 0.18555593 0.4185704 0.55675292 0.18389763 0.42238275 0.55694377 0.18225561 0.42618405 0.5571201 0.18062949 0.42997486 0.55728221 0.17901879 0.43375572 0.55743035 0.17742298 0.4375272 0.55756466 0.17584148 0.44128981 0.55768526 0.17427363 0.4450441 0.55779216 0.17271876 0.4487906 0.55788532 0.17117615 0.4525298 0.55796464 0.16964573 0.45626209 0.55803034 0.16812641 0.45998802 0.55808199 0.1666171 0.46370813 0.55811913 0.16511703 0.4674229 0.55814141 0.16362543 0.47113278 0.55814842 0.16214155 0.47483821 0.55813967 0.16066467 0.47853961 0.55811466 0.15919413 0.4822374 0.5580728 0.15772933 0.48593197 0.55801347 0.15626973 0.4896237 0.557936 0.15481488 0.49331293 0.55783967 0.15336445 0.49700003 0.55772371 0.1519182 0.50068529 0.55758733 0.15047605 0.50436904 0.55742968 0.14903918 0.50805136 0.5572505 0.14760731 0.51173263 0.55704861 0.14618026 0.51541316 0.55682271 0.14475863 0.51909319 0.55657181 0.14334327 0.52277292 0.55629491 0.14193527 0.52645254 0.55599097 0.14053599 0.53013219 0.55565893 0.13914708 0.53381201 0.55529773 0.13777048 0.53749213 0.55490625 0.1364085 0.54117264 0.55448339 0.13506561 0.54485335 0.55402906 0.13374299 0.54853458 0.55354108 0.13244401 0.55221637 0.55301828 0.13117249 0.55589872 0.55245948 0.1299327 0.55958162 0.55186354 0.12872938 0.56326503 0.55122927 0.12756771 0.56694891 0.55055551 0.12645338 0.57063316 0.5498411 0.12539383 0.57431754 0.54908564 0.12439474 0.57800205 0.5482874 0.12346281 0.58168661 0.54744498 0.12260562 0.58537105 0.54655722 0.12183122 0.58905521 0.54562298 0.12114807 0.59273889 0.54464114 0.12056501 0.59642187 0.54361058 0.12009154 0.60010387 0.54253043 0.11973756 0.60378459 0.54139999 0.11951163 0.60746388 0.54021751 0.11942341 0.61114146 0.53898192 0.11948255 0.61481702 0.53769219 0.11969858 0.61849025 0.53634733 0.12008079 0.62216081 0.53494633 0.12063824 0.62582833 0.53348834 0.12137972 0.62949242 0.53197275 0.12231244 0.63315277 0.53039808 0.12344358 0.63680899 0.52876343 0.12477953 0.64046069 0.52706792 0.12632581 0.64410744 0.52531069 0.12808703 0.64774881 0.52349092 0.13006688 0.65138436 0.52160791 0.13226797 0.65501363 0.51966086 0.13469183 0.65863619 0.5176488 0.13733921 0.66225157 0.51557101 0.14020991 0.66585927 0.5134268 0.14330291 0.66945881 0.51121549 0.1466164 0.67304968 0.50893644 0.15014782 0.67663139 0.5065889 0.15389405 0.68020343 0.50417217 0.15785146 0.68376525 0.50168574 0.16201598 0.68731632 0.49912906 0.1663832 0.69085611 0.49650163 0.1709484 0.69438405 0.49380294 0.17570671 0.6978996 0.49103252 0.18065314 0.70140222 0.48818938 0.18578266 0.70489133 0.48527326 0.19109018 0.70836635 0.48228395 0.19657063 0.71182668 0.47922108 0.20221902 0.71527175 0.47608431 0.20803045 0.71870095 0.4728733 0.21400015 0.72211371 0.46958774 0.22012381 0.72550945 0.46622638 0.2263969 0.72888753 0.46278934 0.23281498 0.73224735 0.45927675 0.2393739 0.73558828 0.45568838 0.24606968 0.73890972 0.45202405 0.25289851 0.74221104 0.44828355 0.25985676 0.74549162 0.44446673 0.26694127 0.74875084 0.44057284 0.27414922 0.75198807 0.4366009 0.28147681 0.75520266 0.43255207 0.28892102 0.75839399 0.42842626 0.29647899 0.76156142 0.42422341 0.30414796 0.76470433 0.41994346 0.31192534 0.76782207 0.41558638 0.3198086 0.77091403 0.41115215 0.3277958 0.77397953 0.40664011 0.33588539 0.7770179 0.40204917 0.34407411 0.78002855 0.39738103 0.35235985 0.78301086 0.39263579 0.36074053 0.78596419 0.38781353 0.3692142 0.78888793 0.38291438 0.37777892 0.79178146 0.3779385 0.38643282 0.79464415 0.37288606 0.39517408 0.79747541 0.36775726 0.40400101 0.80027461 0.36255223 0.4129135 0.80304099 0.35726893 0.42190813 0.80577412 0.35191009 0.43098317 0.80847343 0.34647607 0.44013691 0.81113836 0.3409673 0.44936763 0.81376835 0.33538426 0.45867362 0.81636288 0.32972749 0.46805314 0.81892143 0.32399761 0.47750446 0.82144351 0.31819529 0.4870258 0.82392862 0.31232133 0.49661536 0.82637633 0.30637661 0.5062713 0.82878621 0.30036211 0.51599182 0.83115784 0.29427888 0.52577622 0.83349064 0.2881265 0.5356211 0.83578452 0.28190832 0.5455244 0.83803918 0.27562602 0.55548397 0.84025437 0.26928147 0.5654976 0.8424299 0.26287683 0.57556297 0.84456561 0.25641457 0.58567772 0.84666139 0.24989748 0.59583934 0.84871722 0.24332878 0.60604528 0.8507331 0.23671214 0.61629283 0.85270912 0.23005179 0.62657923 0.85464543 0.22335258 0.63690157 0.85654226 0.21662012 0.64725685 0.85839991 0.20986086 0.65764197 0.86021878 0.20308229 0.66805369 0.86199932 0.19629307 0.67848868 0.86374211 0.18950326 0.68894351 0.86544779 0.18272455 0.69941463 0.86711711 0.17597055 0.70989842 0.86875092 0.16925712 0.72039115 0.87035015 0.16260273 0.73088902 0.87191584 0.15602894 0.74138803 0.87344918 0.14956101 0.75188414 0.87495143 0.14322828 0.76237342 0.87642392 0.13706449 0.77285183 0.87786808 0.13110864 0.78331535 0.87928545 0.12540538 0.79375994 0.88067763 0.12000532 0.80418159 0.88204632 0.11496505 0.81457634 0.88339329 0.11034678 0.82494028 0.88472036 0.10621724 0.83526959 0.88602943 0.1026459 0.84556056 0.88732243 0.09970219 0.8558096 0.88860134 0.09745186 0.86601325 0.88986815 0.09595277 0.87616824 0.89112487 0.09525046 0.88627146 0.89237353 0.09537439 0.89632002 0.89361614 0.09633538 0.90631121 0.89485467 0.09812496 0.91624212 0.89609127 0.1007168 0.92610579 0.89732977 0.10407067 0.93590444 0.8985704 0.10813094 0.94563626 0.899815 0.11283773 0.95529972 0.90106534 0.11812832 0.96489353 0.90232311 0.12394051 0.97441665 0.90358991 0.13021494 0.98386829 0.90486726 0.13689671 0.99324789 0.90615657 0.1439362 ]; p = rows (viridi); map = interp1 (1:p, viridi, linspace (1, p, n), "linear"); endfunction ## A better demo of this colormap would be to plot the CIECAM02 values. %!demo %! ## Show the 'viridis' colormap profile and as an image %! cmap = viridis (256); %! subplot (2, 1, 1); %! rgbplot (cmap, "composite"); %! subplot (2, 1, 2); %! rgbplot (cmap);