Mercurial > octave
annotate scripts/image/hsv.m @ 22302:1c4cd12987f5
Use Octave syntax in graphics demos.
* inputdlg.m, listdlg.m, waitbar.m, autumn.m, bone.m, cool.m, copper.m,
cubehelix.m, flag.m, gray.m, hot.m, hsv.m, jet.m, lines.m, ocean.m, pink.m,
prism.m, rainbow.m, rgbplot.m, spring.m, summer.m, viridis.m, white.m,
winter.m, annotation.m, axis.m, clabel.m, daspect.m, datetick.m, grid.m,
legend.m, lighting.m, material.m, pbaspect.m, shading.m, text.m, xlim.m,
ylim.m, zlim.m, area.m, bar.m, barh.m, camlight.m, colorbar.m, comet.m,
comet3.m, contour.m, contour3.m, contourf.m, cylinder.m, ellipsoid.m,
errorbar.m, ezcontour.m, ezcontourf.m, ezmesh.m, ezmeshc.m, ezplot.m,
ezplot3.m, ezsurf.m, ezsurfc.m, feather.m, fill.m, fplot.m, isocaps.m,
isonormals.m, isosurface.m, light.m, line.m, loglog.m, loglogerr.m, mesh.m,
meshc.m, meshz.m, pareto.m, patch.m, pcolor.m, pie.m, pie3.m, plot.m, plot3.m,
plotmatrix.m, plotyy.m, polar.m, quiver.m, quiver3.m, rectangle.m, ribbon.m,
rose.m, scatter.m, scatter3.m, semilogx.m, semilogxerr.m, semilogy.m,
semilogyerr.m, shrinkfaces.m, slice.m, smooth3.m, sombrero.m, stairs.m, stem.m,
stem3.m, stemleaf.m, surf.m, surfc.m, surfl.m, surfnorm.m, tetramesh.m,
trimesh.m, triplot.m, trisurf.m, waterfall.m, copyobj.m, hold.m, linkaxes.m,
linkprop.m, printd.m, refreshdata.m, subplot.m, zoom.m, pcr.m, dump_demos.m:
Use Octave syntax in graphics demos.
author | Rik <rik@octave.org> |
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date | Mon, 15 Aug 2016 15:15:30 -0700 |
parents | 894239974868 |
children | bac0d6f07a3e |
rev | line source |
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1 ## Copyright (C) 1999-2015 Kai Habel |
6788 | 2 ## |
3 ## This file is part of Octave. | |
4 ## | |
5 ## Octave is free software; you can redistribute it and/or modify it | |
6 ## under the terms of the GNU General Public License as published by | |
7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
8 ## your option) any later version. | |
6788 | 9 ## |
10 ## Octave is distributed in the hope that it will be useful, but | |
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 ## General Public License for more details. | |
14 ## | |
15 ## You should have received a copy of the GNU General Public License | |
7016 | 16 ## along with Octave; see the file COPYING. If not, see |
17 ## <http://www.gnu.org/licenses/>. | |
6788 | 18 |
19 ## -*- texinfo -*- | |
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20 ## @deftypefn {} {} hsv (@var{n}) |
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21 ## Create color colormap. This colormap begins with red, changes through |
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22 ## yellow, green, cyan, blue, and magenta, before returning to red. |
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23 ## |
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24 ## It is useful for displaying periodic functions. The map is obtained by |
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25 ## linearly varying the hue through all possible values while keeping constant |
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26 ## maximum saturation and value. The equivalent code is |
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27 ## @code{hsv2rgb ([(0:N-1)'/N, ones(N,2)])}. |
8543 | 28 ## |
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29 ## The argument @var{n} must be a scalar. |
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30 ## If unspecified, the length of the current colormap, or 64, is used. |
6788 | 31 ## @seealso{colormap} |
32 ## @end deftypefn | |
33 | |
34 ## Author: Kai Habel <kai.habel@gmx.de> | |
35 | |
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36 function map = hsv (n = rows (colormap ())) |
6788 | 37 |
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38 if (nargin > 1) |
6788 | 39 print_usage (); |
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40 elseif (! isscalar (n)) |
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41 error ("hsv: N must be a scalar"); |
6788 | 42 endif |
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43 n = double (n); |
6788 | 44 |
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45 if (n == 1) |
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46 map = [1, 0, 0]; |
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47 elseif (n > 1) |
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48 hue = [0:n-1]' / n; |
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49 map = hsv2rgb ([hue, ones(n,1), ones(n,1)]); |
6788 | 50 else |
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51 map = zeros (0, 3); |
6788 | 52 endif |
53 | |
54 endfunction | |
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55 |
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56 |
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57 ## A better demo of this colormap would be to plot the hsv values. |
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58 %!demo |
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59 %! ## Show the 'hsv' colormap profile and as an image |
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60 %! cmap = hsv (256); |
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61 %! subplot (2, 1, 1); |
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Use Octave syntax in graphics demos.
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62 %! rgbplot (cmap, "composite"); |
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63 %! subplot (2, 1, 2); |
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Use Octave syntax in graphics demos.
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parents:
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64 %! rgbplot (cmap); |