Mercurial > hg > octave-nkf
annotate scripts/image/brighten.m @ 12575:d0b799dafede
Grammarcheck files for 3.4.1 release.
| author | Rik <octave@nomad.inbox5.com> |
|---|---|
| date | Mon, 04 Apr 2011 15:33:46 -0700 |
| parents | c792872f8942 |
| children | 72c96de7a403 |
| rev | line source |
|---|---|
| 11523 | 1 ## Copyright (C) 1999-2011 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 {Function File} {@var{map_out} =} brighten (@var{map}, @var{beta}) |
| 6792 | 21 ## @deftypefnx {Function File} {@var{map_out} =} brighten (@var{h}, @var{beta}) |
| 6788 | 22 ## @deftypefnx {Function File} {@var{map_out} =} brighten (@var{beta}) |
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Grammarcheck files for 3.4.1 release.
Rik <octave@nomad.inbox5.com>
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23 ## Darken or brighten the given colormap. If the @var{map} argument |
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24 ## is omitted, the function is applied to the current colormap. The first |
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25 ## argument can also be a valid graphics handle @var{h}, in which case |
| 6788 | 26 ## @code{brighten} is applied to the colormap associated with this handle. |
| 27 ## | |
| 28 ## Should the resulting colormap @var{map_out} not be assigned, it will be | |
| 29 ## written to the current colormap. | |
| 30 ## | |
| 31 ## The argument @var{beta} should be a scalar between -1 and 1, | |
| 32 ## where a negative value darkens and a positive value brightens | |
| 33 ## the colormap. | |
| 34 ## @seealso{colormap} | |
| 35 ## @end deftypefn | |
| 36 | |
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37 function rmap = brighten (arg1, beta) |
| 6788 | 38 h = -1; |
| 39 if (nargin == 1) | |
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Rik <octave@nomad.inbox5.com>
parents:
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40 beta = arg1; |
| 6788 | 41 m = colormap; |
| 42 h = gcf (); | |
| 43 elseif (nargin == 2) | |
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Rik <octave@nomad.inbox5.com>
parents:
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44 if (ishandle (arg1)) |
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Rik <octave@nomad.inbox5.com>
parents:
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45 h = arg1; |
| 6788 | 46 m = get (h, "colormap"); |
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Rik <octave@nomad.inbox5.com>
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47 elseif (ismatrix (arg1) && columns (arg1) == 3) |
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Rik <octave@nomad.inbox5.com>
parents:
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48 m = arg1; |
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Rik <octave@nomad.inbox5.com>
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49 else |
| 8664 | 50 error ("brighten: first argument must be an Nx3 matrix or a handle"); |
| 6788 | 51 endif |
| 52 else | |
| 53 print_usage (); | |
| 54 endif | |
| 55 | |
| 8507 | 56 if (! isscalar (beta) || beta <= -1 || beta >= 1) |
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57 error ("brighten: BETA must be a scalar in the range (-1,1)"); |
| 6788 | 58 endif |
| 59 | |
| 60 if (beta > 0) | |
| 61 gamma = 1 - beta; | |
| 62 else | |
| 63 gamma = 1 / (1 + beta); | |
| 64 endif | |
| 65 | |
| 66 if (nargout == 0) | |
| 67 if (ishandle (h)) | |
| 68 set (h, "colormap", m .^ gamma); | |
| 69 else | |
| 70 colormap (m .^ gamma); | |
| 71 endif | |
| 72 else | |
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Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
10793
diff
changeset
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73 rmap = m .^ gamma; |
| 6788 | 74 endif |
| 75 | |
| 76 endfunction |