Mercurial > octave
view scripts/image/turbo.m @ 33528:6813c5c7e1b9 default tip @
Update to gnulib revision 6213c5bd72d15ca5e1ea9c34122899e02fed448c.
* bootstrap.conf: Update GNULIB_REVISION that contains a fix for a build issue
when targeting Cygwin.
| author | Markus Mützel <markus.muetzel@gmx.de> |
|---|---|
| date | Fri, 03 May 2024 16:04:05 +0200 |
| parents | d8e5e55c3cf5 |
| children |
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######################################################################## ## ## Copyright (C) 2021-2024 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## 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 ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {@var{map} =} turbo () ## @deftypefnx {} {@var{map} =} turbo (@var{n}) ## Create color colormap. This colormap ranges from dark blue through green ## to dark red; similar to the outdated @code{jet} colormap but perceptually ## uniform. ## ## The argument @var{n} must be a scalar. ## If @var{n} is not specified the length of the current colormap is used. If ## there is no current colormap the default value of 256 is used. ## @seealso{colormap} ## @end deftypefn ## This is a port to Octave of the Google LLC colormap "turbo" ## by Anton Mikhailov. The original file is distributed under Apache-2.0: ## https://opensource.org/licenses/Apache-2.0 function map = turbo (n) if (nargin == 1) if (! (isscalar (n) && isreal (n) && n == fix (n))) error ("turbo: N must be a scalar integer"); endif n = double (n); else hf = get (0, "currentfigure"); if (! isempty (hf)) n = rows (get (hf, "colormap")); else n = 256; endif endif persistent turbo_lut = [0.18995, 0.07176, 0.23217; 0.19483, 0.08339, 0.26149; 0.19956, 0.09498, 0.29024; 0.20415, 0.10652, 0.31844; 0.20860, 0.11802, 0.34607; 0.21291, 0.12947, 0.37314; 0.21708, 0.14087, 0.39964; 0.22111, 0.15223, 0.42558; 0.22500, 0.16354, 0.45096; 0.22875, 0.17481, 0.47578; 0.23236, 0.18603, 0.50004; 0.23582, 0.19720, 0.52373; 0.23915, 0.20833, 0.54686; 0.24234, 0.21941, 0.56942; 0.24539, 0.23044, 0.59142; 0.24830, 0.24143, 0.61286; 0.25107, 0.25237, 0.63374; 0.25369, 0.26327, 0.65406; 0.25618, 0.27412, 0.67381; 0.25853, 0.28492, 0.69300; 0.26074, 0.29568, 0.71162; 0.26280, 0.30639, 0.72968; 0.26473, 0.31706, 0.74718; 0.26652, 0.32768, 0.76412; 0.26816, 0.33825, 0.78050; 0.26967, 0.34878, 0.79631; 0.27103, 0.35926, 0.81156; 0.27226, 0.36970, 0.82624; 0.27334, 0.38008, 0.84037; 0.27429, 0.39043, 0.85393; 0.27509, 0.40072, 0.86692; 0.27576, 0.41097, 0.87936; 0.27628, 0.42118, 0.89123; 0.27667, 0.43134, 0.90254; 0.27691, 0.44145, 0.91328; 0.27701, 0.45152, 0.92347; 0.27698, 0.46153, 0.93309; 0.27680, 0.47151, 0.94214; 0.27648, 0.48144, 0.95064; 0.27603, 0.49132, 0.95857; 0.27543, 0.50115, 0.96594; 0.27469, 0.51094, 0.97275; 0.27381, 0.52069, 0.97899; 0.27273, 0.53040, 0.98461; 0.27106, 0.54015, 0.98930; 0.26878, 0.54995, 0.99303; 0.26592, 0.55979, 0.99583; 0.26252, 0.56967, 0.99773; 0.25862, 0.57958, 0.99876; 0.25425, 0.58950, 0.99896; 0.24946, 0.59943, 0.99835; 0.24427, 0.60937, 0.99697; 0.23874, 0.61931, 0.99485; 0.23288, 0.62923, 0.99202; 0.22676, 0.63913, 0.98851; 0.22039, 0.64901, 0.98436; 0.21382, 0.65886, 0.97959; 0.20708, 0.66866, 0.97423; 0.20021, 0.67842, 0.96833; 0.19326, 0.68812, 0.96190; 0.18625, 0.69775, 0.95498; 0.17923, 0.70732, 0.94761; 0.17223, 0.71680, 0.93981; 0.16529, 0.72620, 0.93161; 0.15844, 0.73551, 0.92305; 0.15173, 0.74472, 0.91416; 0.14519, 0.75381, 0.90496; 0.13886, 0.76279, 0.89550; 0.13278, 0.77165, 0.88580; 0.12698, 0.78037, 0.87590; 0.12151, 0.78896, 0.86581; 0.11639, 0.79740, 0.85559; 0.11167, 0.80569, 0.84525; 0.10738, 0.81381, 0.83484; 0.10357, 0.82177, 0.82437; 0.10026, 0.82955, 0.81389; 0.09750, 0.83714, 0.80342; 0.09532, 0.84455, 0.79299; 0.09377, 0.85175, 0.78264; 0.09287, 0.85875, 0.77240; 0.09267, 0.86554, 0.76230; 0.09320, 0.87211, 0.75237; 0.09451, 0.87844, 0.74265; 0.09662, 0.88454, 0.73316; 0.09958, 0.89040, 0.72393; 0.10342, 0.89600, 0.71500; 0.10815, 0.90142, 0.70599; 0.11374, 0.90673, 0.69651; 0.12014, 0.91193, 0.68660; 0.12733, 0.91701, 0.67627; 0.13526, 0.92197, 0.66556; 0.14391, 0.92680, 0.65448; 0.15323, 0.93151, 0.64308; 0.16319, 0.93609, 0.63137; 0.17377, 0.94053, 0.61938; 0.18491, 0.94484, 0.60713; 0.19659, 0.94901, 0.59466; 0.20877, 0.95304, 0.58199; 0.22142, 0.95692, 0.56914; 0.23449, 0.96065, 0.55614; 0.24797, 0.96423, 0.54303; 0.26180, 0.96765, 0.52981; 0.27597, 0.97092, 0.51653; 0.29042, 0.97403, 0.50321; 0.30513, 0.97697, 0.48987; 0.32006, 0.97974, 0.47654; 0.33517, 0.98234, 0.46325; 0.35043, 0.98477, 0.45002; 0.36581, 0.98702, 0.43688; 0.38127, 0.98909, 0.42386; 0.39678, 0.99098, 0.41098; 0.41229, 0.99268, 0.39826; 0.42778, 0.99419, 0.38575; 0.44321, 0.99551, 0.37345; 0.45854, 0.99663, 0.36140; 0.47375, 0.99755, 0.34963; 0.48879, 0.99828, 0.33816; 0.50362, 0.99879, 0.32701; 0.51822, 0.99910, 0.31622; 0.53255, 0.99919, 0.30581; 0.54658, 0.99907, 0.29581; 0.56026, 0.99873, 0.28623; 0.57357, 0.99817, 0.27712; 0.58646, 0.99739, 0.26849; 0.59891, 0.99638, 0.26038; 0.61088, 0.99514, 0.25280; 0.62233, 0.99366, 0.24579; 0.63323, 0.99195, 0.23937; 0.64362, 0.98999, 0.23356; 0.65394, 0.98775, 0.22835; 0.66428, 0.98524, 0.22370; 0.67462, 0.98246, 0.21960; 0.68494, 0.97941, 0.21602; 0.69525, 0.97610, 0.21294; 0.70553, 0.97255, 0.21032; 0.71577, 0.96875, 0.20815; 0.72596, 0.96470, 0.20640; 0.73610, 0.96043, 0.20504; 0.74617, 0.95593, 0.20406; 0.75617, 0.95121, 0.20343; 0.76608, 0.94627, 0.20311; 0.77591, 0.94113, 0.20310; 0.78563, 0.93579, 0.20336; 0.79524, 0.93025, 0.20386; 0.80473, 0.92452, 0.20459; 0.81410, 0.91861, 0.20552; 0.82333, 0.91253, 0.20663; 0.83241, 0.90627, 0.20788; 0.84133, 0.89986, 0.20926; 0.85010, 0.89328, 0.21074; 0.85868, 0.88655, 0.21230; 0.86709, 0.87968, 0.21391; 0.87530, 0.87267, 0.21555; 0.88331, 0.86553, 0.21719; 0.89112, 0.85826, 0.21880; 0.89870, 0.85087, 0.22038; 0.90605, 0.84337, 0.22188; 0.91317, 0.83576, 0.22328; 0.92004, 0.82806, 0.22456; 0.92666, 0.82025, 0.22570; 0.93301, 0.81236, 0.22667; 0.93909, 0.80439, 0.22744; 0.94489, 0.79634, 0.22800; 0.95039, 0.78823, 0.22831; 0.95560, 0.78005, 0.22836; 0.96049, 0.77181, 0.22811; 0.96507, 0.76352, 0.22754; 0.96931, 0.75519, 0.22663; 0.97323, 0.74682, 0.22536; 0.97679, 0.73842, 0.22369; 0.98000, 0.73000, 0.22161; 0.98289, 0.72140, 0.21918; 0.98549, 0.71250, 0.21650; 0.98781, 0.70330, 0.21358; 0.98986, 0.69382, 0.21043; 0.99163, 0.68408, 0.20706; 0.99314, 0.67408, 0.20348; 0.99438, 0.66386, 0.19971; 0.99535, 0.65341, 0.19577; 0.99607, 0.64277, 0.19165; 0.99654, 0.63193, 0.18738; 0.99675, 0.62093, 0.18297; 0.99672, 0.60977, 0.17842; 0.99644, 0.59846, 0.17376; 0.99593, 0.58703, 0.16899; 0.99517, 0.57549, 0.16412; 0.99419, 0.56386, 0.15918; 0.99297, 0.55214, 0.15417; 0.99153, 0.54036, 0.14910; 0.98987, 0.52854, 0.14398; 0.98799, 0.51667, 0.13883; 0.98590, 0.50479, 0.13367; 0.98360, 0.49291, 0.12849; 0.98108, 0.48104, 0.12332; 0.97837, 0.46920, 0.11817; 0.97545, 0.45740, 0.11305; 0.97234, 0.44565, 0.10797; 0.96904, 0.43399, 0.10294; 0.96555, 0.42241, 0.09798; 0.96187, 0.41093, 0.09310; 0.95801, 0.39958, 0.08831; 0.95398, 0.38836, 0.08362; 0.94977, 0.37729, 0.07905; 0.94538, 0.36638, 0.07461; 0.94084, 0.35566, 0.07031; 0.93612, 0.34513, 0.06616; 0.93125, 0.33482, 0.06218; 0.92623, 0.32473, 0.05837; 0.92105, 0.31489, 0.05475; 0.91572, 0.30530, 0.05134; 0.91024, 0.29599, 0.04814; 0.90463, 0.28696, 0.04516; 0.89888, 0.27824, 0.04243; 0.89298, 0.26981, 0.03993; 0.88691, 0.26152, 0.03753; 0.88066, 0.25334, 0.03521; 0.87422, 0.24526, 0.03297; 0.86760, 0.23730, 0.03082; 0.86079, 0.22945, 0.02875; 0.85380, 0.22170, 0.02677; 0.84662, 0.21407, 0.02487; 0.83926, 0.20654, 0.02305; 0.83172, 0.19912, 0.02131; 0.82399, 0.19182, 0.01966; 0.81608, 0.18462, 0.01809; 0.80799, 0.17753, 0.01660; 0.79971, 0.17055, 0.01520; 0.79125, 0.16368, 0.01387; 0.78260, 0.15693, 0.01264; 0.77377, 0.15028, 0.01148; 0.76476, 0.14374, 0.01041; 0.75556, 0.13731, 0.00942; 0.74617, 0.13098, 0.00851; 0.73661, 0.12477, 0.00769; 0.72686, 0.11867, 0.00695; 0.71692, 0.11268, 0.00629; 0.70680, 0.10680, 0.00571; 0.69650, 0.10102, 0.00522; 0.68602, 0.09536, 0.00481; 0.67535, 0.08980, 0.00449; 0.66449, 0.08436, 0.00424; 0.65345, 0.07902, 0.00408; 0.64223, 0.07380, 0.00401; 0.63082, 0.06868, 0.00401; 0.61923, 0.06367, 0.00410; 0.60746, 0.05878, 0.00427; 0.59550, 0.05399, 0.00453; 0.58336, 0.04931, 0.00486; 0.57103, 0.04474, 0.00529; 0.55852, 0.04028, 0.00579; 0.54583, 0.03593, 0.00638; 0.53295, 0.03169, 0.00705; 0.51989, 0.02756, 0.00780; 0.50664, 0.02354, 0.00863; 0.49321, 0.01963, 0.00955; 0.47960, 0.01583, 0.01055]; p = rows (turbo_lut); map = interp1 (1:p, turbo_lut, linspace (1, p, n), "linear"); endfunction %!demo %! ## Show the 'turbo' colormap profile and as an image %! cmap = turbo (256); %! subplot (2, 1, 1); %! rgbplot (cmap, "composite"); %! subplot (2, 1, 2); %! rgbplot (cmap); %!assert (size (turbo ()), [256, 3]) %!assert (size (turbo (16)), [16, 3]) %!assert (turbo(0), zeros (0, 3)) %!assert (turbo(-1), zeros (0, 3)) %!shared a %! a = [0.18995, 0.07176, 0.23217; %! 0.10342, 0.89600, 0.71500; %! 0.98000, 0.73000, 0.22161; %! 0.47960, 0.01583, 0.01055]; %!assert (turbo (1), a(4,:)) %!assert (turbo (true), double (a(4,:))) %!assert (turbo (char (1)), double (a(4,:))) %!assert (turbo (int32 (1)), double (a(4,:))) %!assert (turbo (4), a, eps) %!shared # Clear shared varibles to avoid echo on unrelated test errors. ## Input validation %!error <N must be a scalar integer> turbo ("foo") %!error <N must be a scalar integer> turbo ([1, 2, 3]) %!error <N must be a scalar integer> turbo ({1, 2, 3})