# HG changeset patch
# User Ben Abbott <bpabbott@mac.com>
# Date 1235878773 18000
# Node ID ae51d068bbd5f1c2e61564ec959f13a0ba4ae2f0
# Parent  665b264b6a50d073eaeea878063f872e13b3128d
__actual_axis_position__.m: New function to determine position of rendered axes.

diff -r 665b264b6a50 -r ae51d068bbd5 scripts/ChangeLog
--- a/scripts/ChangeLog	Sat Feb 28 19:36:09 2009 -0500
+++ b/scripts/ChangeLog	Sat Feb 28 22:39:33 2009 -0500
@@ -1,3 +1,8 @@
+2009-02-28  Ben Abbott <bpabbott@mac.com>
+
+	* plot/__actual_axis_position__.m: Include file missed in prior
+	changeset.
+
 2009-02-28  Ben Abbott <bpabbott@mac.com>
 
 	* plot/print.m, plot/gnuplot_drawnow.m: Add compatible support for
diff -r 665b264b6a50 -r ae51d068bbd5 scripts/plot/__actual_axis_position__.m
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/plot/__actual_axis_position__.m	Sat Feb 28 22:39:33 2009 -0500
@@ -0,0 +1,88 @@
+## Copyright (C) 2009 Ben Abbott
+##
+## 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} {} __actual_axis_position__ (@var{h})
+## @deftypefnx {Function File} {} __actual_axis_position__ (@var{axis_struct})
+## Undocumented internal function.
+## @end deftypefn
+
+## Author: Ben Abbott
+
+function pos = __actual_axis_position__ (axis_obj)
+  if (ishandle (axis_obj))
+    axis_obj = get (axis_obj);
+  endif
+
+  ## When using {rltb}margin, Gnuplot does not handle the specified
+  ## aspect ratio properly, so handle it here.
+  if (__calc_dimensions__ (axis_obj) == 3)
+    ## FIXME -- this works for "axis square", but has not been
+    ##          thoroughly tested for other aspect ratios.
+    aspect_ratio_2d = [max(axis_obj.dataaspectratio(1:2)), ...
+			   axis_obj.dataaspectratio(3)/sqrt(2)];
+  else
+    aspect_ratio_2d = axis_obj.dataaspectratio(1:2);
+  endif
+  orig_fig_units = get (axis_obj.parent, "units");
+  orig_fig_position = get (axis_obj.parent, "units");
+  unwind_protect
+    set (axis_obj.parent, "units", "pixels")
+    fig_position = get (axis_obj.parent, "position");
+    pos_in_pixels = axis_obj.position .* fig_position([3, 4, 3, 4]);
+    orig_aspect_ratio_2d = pos_in_pixels(3:4);
+    rel_aspect_ratio_2d =  aspect_ratio_2d ./ orig_aspect_ratio_2d;
+    rel_aspect_ratio_2d = rel_aspect_ratio_2d ./ max (rel_aspect_ratio_2d);
+    if (rel_aspect_ratio_2d(1) < rel_aspect_ratio_2d(2));
+      dx = (1.0 - rel_aspect_ratio_2d(1)) * pos_in_pixels(3);
+      pos_in_pixels = pos_in_pixels + dx*[0.5, 0.0, -1.0, 0.0];
+    elseif (rel_aspect_ratio_2d(1) > rel_aspect_ratio_2d(2))
+      dy = (1.0 - rel_aspect_ratio_2d(2)) * pos_in_pixels(4);
+      pos_in_pixels = pos_in_pixels + dy*[0.0, 0.5, 0.0, -1.0];
+    endif
+    pos = pos_in_pixels ./ fig_position([3, 4, 3, 4]);
+  unwind_protect_cleanup
+    set (axis_obj.parent, "units", orig_fig_units)
+    set (axis_obj.parent, "units", orig_fig_position)
+  end_unwind_protect
+
+endfunction
+
+function nd = __calc_dimensions__ (obj)
+  kids = obj.children;
+  nd = 2;
+  for i = 1:length (kids)
+    obj = get (kids(i));
+    switch (obj.type)
+      case {"image", "text"}
+        ## ignore as they 
+      case {"line", "patch"}
+        if (! isempty (obj.zdata))
+          nd = 3;
+        endif
+      case "surface"
+        nd = 3;
+      case "hggroup"
+        obj_nd = __calc_dimensions__ (obj);
+        if (obj_nd == 3)
+          nd = 3;
+        endif
+    endswitch
+  endfor
+endfunction
+