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view scripts/image/colorcube.m @ 21546:f7f97d7e9294
doc: Wrap m-file docstrings to 79 characters + newline (80 total).
* isrecording.m, soundsc.m, delaunay3.m, cell2mat.m, cumtrapz.m, del2.m,
inputParser.m, interp1.m, interp3.m, narginchk.m, profile.m,
validateattributes.m, delaunayn.m, tsearchn.m, voronoin.m, brighten.m,
cmunique.m, colorcube.m, imfinfo.m, imshow.m, edit.m, orderfields.m, run.m,
warning_ids.m, ode23.m, ode45.m, odeget.m, integrate_adaptive.m, kahan.m,
ode_struct_value_check.m, runge_kutta_23.m, fminunc.m, fsolve.m, fzero.m,
pkg.m, build.m, specular.m, view.m, bar.m, barh.m, contour3.m, isosurface.m,
line.m, pie.m, pie3.m, quiver3.m, scatter.m, scatter3.m, stem3.m, stemleaf.m,
surfl.m, tetramesh.m, isfigure.m, mkpp.m, pchip.m, residue.m, splinefit.m,
rmpref.m, unique.m, eigs.m, ilu.m, factor.m, factorial.m, gallery.m, hankel.m,
histc.m, ols.m, finv.m, fpdf.m, kruskal_wallis_test.m, weekday.m:
Wrap m-file docstrings to 79 characters + newline (80 total).
author | Rik <rik@octave.org> |
---|---|
date | Sun, 27 Mar 2016 15:50:01 -0700 |
parents | 516bb87ea72e |
children | 283d8dfcad37 |
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## Copyright (C) 2012-2015 Rik Wehbring ## ## 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} =} colorcube () ## @deftypefnx {} {@var{map} =} colorcube (@var{n}) ## Create color colormap. This colormap is composed of as many equally ## spaced colors (not grays) in the RGB color space as possible. ## ## If there are not a perfect number @var{n} of regularly spaced colors then ## the remaining entries in the colormap are gradients of pure red, green, ## blue, and gray. ## ## The argument @var{n} must be a scalar. ## If unspecified, the length of the current colormap, or 64, is used. ## @seealso{colormap} ## @end deftypefn function map = colorcube (n) if (nargin == 0) n = rows (colormap); elseif (nargin == 1) if (! isscalar (n)) error ("colorcube: N must be a scalar"); endif else print_usage (); endif if (n < 9) map = gray (n); return; endif ## Create colorcube of evenly spaced points with side length of n^1/3 cubelen = fix (cbrt (n)); reserve = n - cubelen^3; if (reserve == 0) ## Steal space from blue to put the gray gradient [r, g, b] = meshgrid (linspace (0,1,cubelen), linspace (0,1,cubelen), linspace (0,1,cubelen-1)); else [r, g, b] = meshgrid (linspace (0,1,cubelen), linspace (0,1,cubelen), linspace (0,1,cubelen)); endif ## Create map and weed out grays map = [r(:), g(:), b(:)]; idx = any (bsxfun (@ne, map(:, 1), map(:, 2:3)), 2); map = map(idx, :); ## Weed out pure colors idx = sum (map == 0, 2); map = map(idx != 2, :); ## Put in remaining gradients of pure red, green, blue, and gray reserve = n - rows (map) - 1; csteps = fix (reserve/4); cstepsz = 1 / csteps; cgrad = (cstepsz:cstepsz:1)'; gsteps = reserve - 3*csteps; gstepsz = 1 / gsteps; ggrad = (gstepsz:gstepsz:1)'; map = [map cgrad, zeros(csteps, 1), zeros(csteps, 1) zeros(csteps, 1), cgrad, zeros(csteps, 1) zeros(csteps, 1), zeros(csteps, 1), cgrad 0, 0, 0 ggrad, ggrad, ggrad]; endfunction %!demo %! ## Show the 'colorcube' colormap as an image %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); %! axis ([1, 64, 0, 1], "ticy", "xy"); %! colormap (colorcube (64));