Mercurial > octave-antonio
view scripts/image/spinmap.m @ 17118:c97a26408ee0
Implement PixelRegion option for imread().
* imread.m: document new option.
* private/__imread__.m: parse new option and set defaults.
* __magick_read__.cc (calculate region): new option to calculate the region
to be read, shifts in memory required, and output image size.
(read_indexed_images, read_images): implement reading of only specific
regions of an image.
(__magick_read__): get octave_scalar_map at start for simplicity.
author | Carnë Draug <carandraug@octave.org> |
---|---|
date | Wed, 31 Jul 2013 21:28:48 +0100 |
parents | 284656167c25 |
children | bc924baa2c4e |
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## Copyright (C) 2007-2012 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} {} spinmap () ## @deftypefnx {Function File} {} spinmap (@var{t}) ## @deftypefnx {Function File} {} spinmap (@var{t}, @var{inc}) ## @deftypefnx {Function File} {} spinmap ("inf") ## Cycle the colormap for @var{t} seconds with a color increment of @var{inc}. ## Both parameters are optional. The default cycle time is 5 seconds and the ## default increment is 2. If the option "inf" is given then cycle ## continuously until @kbd{Control-C} is pressed. ## ## When rotating the original color 1 becomes color 2, color 2 becomes ## color 3, etc. A positive or negative increment is allowed and a higher ## value of @var{inc} will cause faster cycling through the colormap. ## @seealso{colormap} ## @end deftypefn ## Author: Kai Habel <kai.habel at gmx.de> function spinmap (t = 5, inc = 2) if (nargin > 2) print_usage (); elseif (ischar (t)) if (strcmpi (t, "inf")) t = Inf; else error ('spinmap: time T must be a real scalar or "inf"'); endif elseif (! isscalar (t) || ! isreal (t)) error ("spinmap: time T must be a real scalar"); endif cmap = cmap_orig = get (gcf (), "colormap"); t0 = clock; while (etime (clock, t0) < t) cmap = shift (cmap, inc, 1); set (gcf (), "colormap", cmap); drawnow (); endwhile set (gcf (), "colormap", cmap_orig); endfunction %!demo %! clf; %! colormap (rainbow (128)); %! imagesc (1:8); %! axis off; %! title ("Rotate color bars to the right"); %! spinmap (3, 1);