Mercurial > octave-nkf
view scripts/image/image.m @ 18860:87c3848cf3c0
Fix bug when hggroup used with primitive graphic object (bug #42532).
* image.m, text.m, line.m, patch.m: __plt_get_axis_arg__ will return axis and
hggroup when 'parent' property is used. Select the first returned object
which is the axes, rather than passing both axis and hggroup to further plot
subroutines.
author | Rik <rik@octave.org> |
---|---|
date | Tue, 10 Jun 2014 14:03:09 -0700 |
parents | 44f0d1a53ead |
children | 3d9e503aea2c |
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## Copyright (C) 1994-2013 John W. Eaton ## ## 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} {} image (@var{img}) ## @deftypefnx {Function File} {} image (@var{x}, @var{y}, @var{img}) ## @deftypefnx {Function File} {} image (@dots{}, "@var{prop}", @var{val}, @dots{}) ## @deftypefnx {Function File} {} image ("@var{prop1}", @var{val1}, @dots{}) ## @deftypefnx {Function File} {@var{h} =} image (@dots{}) ## Display a matrix as an indexed color image. ## ## The elements of @var{img} are indices into the current colormap. ## @var{x} and @var{y} are optional 2-element vectors, @w{@code{[min, max]}}, ## which specify the range for the axis labels. If a range is specified as ## @w{@code{[max, min]}} then the image will be reversed along that axis. For ## convenience, @var{x} and @var{y} may be specified as N-element vectors ## matching the length of the data in @var{img}. However, only the first and ## last elements will be used to determine the axis limits. ## @strong{Warning:} @var{x} and @var{y} are ignored when using gnuplot 4.0 ## or earlier. ## ## Multiple property/value pairs may be specified for the image object, but ## they must appear in pairs. ## ## The optional return value @var{h} is a graphics handle to the image. ## ## Implementation Note: The origin (0, 0) for images is located in the ## upper left. For ordinary plots, the origin is located in the lower ## left. Octave handles this inversion by plotting the data normally, ## and then reversing the direction of the y-axis by setting the ## @code{ydir} property to @qcode{"reverse"}. This has implications whenever ## an image and an ordinary plot need to be overlaid. The recommended ## solution is to display the image and then plot the reversed ydata ## using, for example, @code{flipud (ydata)}. ## ## Calling Forms: The @code{image} function can be called in two forms: ## High-Level and Low-Level. When invoked with normal options, the High-Level ## form is used which first calls @code{newplot} to prepare the graphic figure ## and axes. When the only inputs to @code{image} are property/value pairs ## the Low-Level form is used which creates a new instance of an image object ## and inserts it in the current axes. ## @seealso{imshow, imagesc, colormap} ## @end deftypefn ## Author: Tony Richardson <arichard@stark.cc.oh.us> ## Created: July 1994 ## Adapted-By: jwe function h = image (varargin) [hax, varargin, nargin] = __plt_get_axis_arg__ ("image", varargin{:}); chararg = find (cellfun ("isclass", varargin, "char"), 1, "first"); do_new = true; if (nargin == 0) img = imread ("default.img"); x = y = []; elseif (chararg == 1) ## Low-Level syntax do_new = false; x = y = img = []; idx = find (strcmpi (varargin, "cdata"), 1); if (idx) img = varargin{idx+1}; varargin(idx:idx+1) = []; endif idx = find (strcmpi (varargin, "xdata"), 1); if (idx) x = varargin{idx+1}; varargin(idx:idx+1) = []; endif idx = find (strcmpi (varargin, "ydata"), 1); if (idx) y = varargin{idx+1}; varargin(idx:idx+1) = []; endif elseif (nargin == 1 || chararg == 2) img = varargin{1}; x = y = []; elseif (nargin == 2 || chararg == 3) print_usage (); else x = varargin{1}; y = varargin{2}; img = varargin{3}; chararg = 4; endif oldfig = []; if (! isempty (hax)) oldfig = get (0, "currentfigure"); endif unwind_protect if (do_new) hax = newplot (hax); elseif (isempty (hax)) hax = gca (); else hax = hax(1); endif htmp = __img__ (hax, do_new, x, y, img, varargin{chararg:end}); unwind_protect_cleanup if (! isempty (oldfig)) set (0, "currentfigure", oldfig); endif end_unwind_protect if (nargout > 0) h = htmp; endif endfunction ## Generic image creation. ## ## The axis values corresponding to the matrix elements are specified in ## @var{x} and @var{y}. If you're not using gnuplot 4.2 or later, these ## variables are ignored. ## Author: Tony Richardson <arichard@stark.cc.oh.us> ## Created: July 1994 ## Adapted-By: jwe function h = __img__ (hax, do_new, x, y, img, varargin) if (! isempty (img)) if (isempty (x)) x = [1, columns(img)]; endif if (isempty (y)) y = [1, rows(img)]; endif xdata = x([1, end])(:).'; # (:).' is a hack to guarantee row vector ydata = y([1, end])(:).'; if (numel (x) > 2 && numel (y) > 2) ## Test data for non-linear spacing which is unsupported tol = .01; # 1% tolerance. FIXME: this value was chosen without thought. dx = diff (x); dxmean = (max (x) - min (x)) / (numel (x) - 1); dx = abs ((abs (dx) - dxmean) / dxmean); dy = diff (y); dymean = (max (y) - min (y)) / (numel (y) - 1); dy = abs ((abs (dy) - dymean) / dymean); if (any (dx > tol) || any (dy > tol)) warning (["image: non-linear X, Y data is ignored. " ... "IMG will be shown with linear mapping"]); endif endif endif # ! isempty (img) h = __go_image__ (hax, "cdata", img, "xdata", xdata, "ydata", ydata, "cdatamapping", "direct", varargin{:}); if (do_new && ! ishold (hax)) ## Set axis properties for new images if (! isempty (img)) if (isscalar (get (hax, "children"))) axis (hax, "tight"); endif if (ndims (img) == 3) if (isinteger (img)) cls = class (img); mn = intmin (cls); mx = intmax (cls); set (hax, "clim", double ([mn, mx])); endif endif endif # ! isempty (img) set (hax, "view", [0, 90], "ydir", "reverse", "layer", "top"); endif # do_new endfunction %!demo %! clf; %! colormap (jet (21)); %! img = 1 ./ hilb (11); %! x = y = -5:5; %! subplot (2,2,1); %! h = image (x, y, img); %! ylabel ("limits = [-5.5, 5.5]"); %! title ("image (x, y, img)"); %! subplot (2,2,2); %! h = image (-x, y, img); %! title ("image (-x, y, img)"); %! subplot (2,2,3); %! h = image (x, -y, img); %! title ("image (x, -y, img)"); %! ylabel ("limits = [-5.5, 5.5]"); %! subplot (2,2,4); %! h = image (-x, -y, img); %! title ("image (-x, -y, img)"); ## FIXME: Need %!tests for linear