Mercurial > octave-nkf
view scripts/image/hsv.m @ 14640:b9c02ee24de1
new colormap options
* colormap.m: New options, list, register, and unregister.
* NEWS: Note new colormap options.
* autumn.m, bone.m, cool.m, copper.m, flag.m, gmap40.m, gray.m, hot.m,
hsv.m, jet.m, lines.m, ocean.m, pink.m, prism.m, rainbow.m,
spring.m, summer.m, winter: Always size and return 0x3 when size < 1.
Include PKD_ADD and PKG_DEL commands to register and unregister
colormap funtions.
author | Carnë Draug <carandraug+dev@gmail.com> |
---|---|
date | Wed, 16 May 2012 16:52:08 -0400 |
parents | f205d0074687 |
children | 5f1d4def40e1 |
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## Copyright (C) 1999-2012 Kai Habel ## ## 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} {} hsv (@var{n}) ## Create color colormap. This colormap begins with red, changes through ## yellow, green, cyan, blue, and magenta, before returning to red. ## It is useful for displaying periodic functions. The map is obtained by ## linearly varying the hue through all possible values while keeping constant ## maximum saturation and value. The equivalent code is ## @code{hsv2rgb ([linspace(0,1,N)', ones(N,2)])}. ## ## 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: Kai Habel <kai.habel@gmx.de> ## PKG_ADD: colormap ("register", "hsv"); ## PKG_DEL: colormap ("unregister", "hsv"); function map = hsv (n) if (nargin == 0) n = rows (colormap); elseif (nargin == 1) if (! isscalar (n)) error ("hsv: argument must be a scalar"); endif else print_usage (); endif if (n == 1) map = [1, 0, 0]; elseif (n > 1) hue = linspace (0, 1, n)'; map = hsv2rgb ([hue, ones(n,1), ones(n,1)]); else map = []; endif endfunction %!demo %! ## Show the 'hsv' colormap as an image %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); %! axis ([1, 64, 0, 1], "ticy", "xy"); %! colormap (hsv (64));