Mercurial > octave-nkf
changeset 20564:2e7a09136516
Add the default matplotlib colormap "viridis" to the list of colormaps
* scripts/image/viridis.m : new file
* scripts/image/module.mk : include it
| author | Carlo de Falco <cdf@users.sourceforge.net> |
|---|---|
| date | Wed, 23 Sep 2015 12:14:43 +0200 |
| parents | 50bf240978e6 |
| children | 17e507df10e3 |
| files | scripts/image/module.mk scripts/image/viridis.m |
| diffstat | 2 files changed, 317 insertions(+), 0 deletions(-) [+] |
line wrap: on
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--- a/scripts/image/module.mk Tue Sep 29 12:42:10 2015 -0700 +++ b/scripts/image/module.mk Wed Sep 23 12:14:43 2015 +0200 @@ -54,6 +54,7 @@ scripts/image/spinmap.m \ scripts/image/spring.m \ scripts/image/summer.m \ + scripts/image/viridis.m \ scripts/image/white.m \ scripts/image/winter.m
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/scripts/image/viridis.m Wed Sep 23 12:14:43 2015 +0200 @@ -0,0 +1,316 @@ +## 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 {Function File} {@var{map} =} viridis () +## @deftypefnx {Function File} {@var{map} =} viridis (@var{n}) +## Create color colormap. The colors begin with dark purplish-blue and +## blue, range through green and end with 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 of the the default matplotlib colormap "viridis" +## by Eric Firing to Octave, the original file is distributed under CC0: +## http://creativecommons.org/publicdomain/zero/1.0 + +function c = viridis (n = rows (colormap ())) + + if (nargin > 1) + print_usage (); + elseif (! isscalar (n)) + error ("viridis: N must be a scalar"); + endif + + 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 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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); + c = interp1 (1:p, viridi, linspace (1, p, n), 'linear'); + +endfunction + +%!demo +%! ## Show the 'viridis' colormap as an image +%! image (1:256, linspace (0, 1, 256), repmat ((1:256)', 1, 256)); +%! axis ([1, 256, 0, 1], "ticy", "xy"); +%! colormap (viridis (256));