maint: Split scripts/plot directory into 4 pieces. scripts/gui : user-interface functions scripts/plot/appearance : functions controlling plot appearance scripts/plot/draw : plotting functions which produce graphs scripts/plot/util : low-level plotting functions and utilities. * scripts/gui/guidata.m, scripts/gui/guihandles.m, scripts/gui/module.mk, scripts/gui/private/__file_filter__.m, scripts/gui/private/__fltk_file_filter__.m, scripts/gui/private/__is_function__.m, scripts/gui/private/__uigetdir_fltk__.m, scripts/gui/private/__uigetfile_fltk__.m, scripts/gui/private/__uiobject_split_args__.m, scripts/gui/private/__uiputfile_fltk__.m, scripts/gui/uicontextmenu.m, scripts/gui/uicontrol.m, scripts/gui/uigetdir.m, scripts/gui/uigetfile.m, scripts/gui/uimenu.m, scripts/gui/uipanel.m, scripts/gui/uipushtool.m, scripts/gui/uiputfile.m, scripts/gui/uiresume.m, scripts/gui/uitoggletool.m, scripts/gui/uitoolbar.m, scripts/gui/uiwait.m, scripts/gui/waitbar.m, scripts/gui/waitforbuttonpress.m: Moved from scripts/plot to scripts/gui * scripts/plot/appearance/__clabel__.m, scripts/plot/appearance/__getlegenddata__.m, scripts/plot/appearance/axis.m, scripts/plot/appearance/box.m, scripts/plot/appearance/caxis.m, scripts/plot/appearance/clabel.m, scripts/plot/appearance/daspect.m, scripts/plot/appearance/diffuse.m, scripts/plot/appearance/grid.m, scripts/plot/appearance/gtext.m, scripts/plot/appearance/hidden.m, scripts/plot/appearance/legend.m, scripts/plot/appearance/orient.m, scripts/plot/appearance/pbaspect.m, scripts/plot/appearance/private/__axis_label__.m, scripts/plot/appearance/private/__axis_limits__.m, scripts/plot/appearance/shading.m, scripts/plot/appearance/specular.m, scripts/plot/appearance/text.m, scripts/plot/appearance/title.m, scripts/plot/appearance/view.m, scripts/plot/appearance/whitebg.m, scripts/plot/appearance/xlabel.m, scripts/plot/appearance/xlim.m, scripts/plot/appearance/ylabel.m, scripts/plot/appearance/ylim.m, scripts/plot/appearance/zlabel.m, scripts/plot/appearance/zlim.m: Moved from scripts/plot to subdir appearance. * scripts/plot/draw/area.m, scripts/plot/draw/bar.m, scripts/plot/draw/barh.m, scripts/plot/draw/colorbar.m, scripts/plot/draw/comet.m, scripts/plot/draw/comet3.m, scripts/plot/draw/compass.m, scripts/plot/draw/contour.m, scripts/plot/draw/contour3.m, scripts/plot/draw/contourc.m, scripts/plot/draw/contourf.m, scripts/plot/draw/cylinder.m, scripts/plot/draw/ellipsoid.m, scripts/plot/draw/errorbar.m, scripts/plot/draw/ezcontour.m, scripts/plot/draw/ezcontourf.m, scripts/plot/draw/ezmesh.m, scripts/plot/draw/ezmeshc.m, scripts/plot/draw/ezplot.m, scripts/plot/draw/ezplot3.m, scripts/plot/draw/ezpolar.m, scripts/plot/draw/ezsurf.m, scripts/plot/draw/ezsurfc.m, scripts/plot/draw/feather.m, scripts/plot/draw/fill.m, scripts/plot/draw/fplot.m, scripts/plot/draw/hist.m, scripts/plot/draw/isocolors.m, scripts/plot/draw/isonormals.m, scripts/plot/draw/isosurface.m, scripts/plot/draw/line.m, scripts/plot/draw/loglog.m, scripts/plot/draw/loglogerr.m, scripts/plot/draw/mesh.m, scripts/plot/draw/meshc.m, scripts/plot/draw/meshz.m, scripts/plot/draw/pareto.m, scripts/plot/draw/patch.m, scripts/plot/draw/pcolor.m, scripts/plot/draw/peaks.m, scripts/plot/draw/pie.m, scripts/plot/draw/pie3.m, scripts/plot/draw/plot.m, scripts/plot/draw/plot3.m, scripts/plot/draw/plotmatrix.m, scripts/plot/draw/plotyy.m, scripts/plot/draw/polar.m, scripts/plot/draw/private/__add_datasource__.m, scripts/plot/draw/private/__bar__.m, scripts/plot/draw/private/__contour__.m, scripts/plot/draw/private/__errcomm__.m, scripts/plot/draw/private/__errplot__.m, scripts/plot/draw/private/__ezplot__.m, scripts/plot/draw/private/__interp_cube__.m, scripts/plot/draw/private/__line__.m, scripts/plot/draw/private/__marching_cube__.m, scripts/plot/draw/private/__patch__.m, scripts/plot/draw/private/__pie__.m, scripts/plot/draw/private/__plt__.m, scripts/plot/draw/private/__quiver__.m, scripts/plot/draw/private/__scatter__.m, scripts/plot/draw/private/__stem__.m, scripts/plot/draw/quiver.m, scripts/plot/draw/quiver3.m, scripts/plot/draw/rectangle.m, scripts/plot/draw/ribbon.m, scripts/plot/draw/rose.m, scripts/plot/draw/scatter.m, scripts/plot/draw/scatter3.m, scripts/plot/draw/semilogx.m, scripts/plot/draw/semilogxerr.m, scripts/plot/draw/semilogy.m, scripts/plot/draw/semilogyerr.m, scripts/plot/draw/shrinkfaces.m, scripts/plot/draw/slice.m, scripts/plot/draw/sombrero.m, scripts/plot/draw/sphere.m, scripts/plot/draw/stairs.m, scripts/plot/draw/stem.m, scripts/plot/draw/stem3.m, scripts/plot/draw/stemleaf.m, scripts/plot/draw/surf.m, scripts/plot/draw/surface.m, scripts/plot/draw/surfc.m, scripts/plot/draw/surfl.m, scripts/plot/draw/surfnorm.m, scripts/plot/draw/tetramesh.m, scripts/plot/draw/trimesh.m, scripts/plot/draw/triplot.m, scripts/plot/draw/trisurf.m, scripts/plot/draw/waterfall.m: Moved from plot/ to subdir draw. * scripts/plot/util/__actual_axis_position__.m, scripts/plot/util/__default_plot_options__.m, scripts/plot/util/__gnuplot_drawnow__.m, scripts/plot/util/__next_line_color__.m, scripts/plot/util/__next_line_style__.m, scripts/plot/util/__plt_get_axis_arg__.m, scripts/plot/util/__pltopt__.m, scripts/plot/util/allchild.m, scripts/plot/util/ancestor.m, scripts/plot/util/axes.m, scripts/plot/util/cla.m, scripts/plot/util/clf.m, scripts/plot/util/close.m, scripts/plot/util/closereq.m, scripts/plot/util/colstyle.m, scripts/plot/util/copyobj.m, scripts/plot/util/figure.m, scripts/plot/util/findall.m, scripts/plot/util/findfigs.m, scripts/plot/util/findobj.m, scripts/plot/util/gca.m, scripts/plot/util/gcbf.m, scripts/plot/util/gcbo.m, scripts/plot/util/gcf.m, scripts/plot/util/gco.m, scripts/plot/util/ginput.m, scripts/plot/util/gnuplot_binary.in, scripts/plot/util/graphics_toolkit.m, scripts/plot/util/hdl2struct.m, scripts/plot/util/hggroup.m, scripts/plot/util/hold.m, scripts/plot/util/isaxes.m, scripts/plot/util/isfigure.m, scripts/plot/util/ishghandle.m, scripts/plot/util/ishold.m, scripts/plot/util/isprop.m, scripts/plot/util/linkprop.m, scripts/plot/util/meshgrid.m, scripts/plot/util/ndgrid.m, scripts/plot/util/newplot.m, scripts/plot/util/print.m, scripts/plot/util/printd.m, scripts/plot/util/private/__add_default_menu__.m, scripts/plot/util/private/__fltk_ginput__.m, scripts/plot/util/private/__fltk_print__.m, scripts/plot/util/private/__ghostscript__.m, scripts/plot/util/private/__gnuplot_get_var__.m, scripts/plot/util/private/__gnuplot_ginput__.m, scripts/plot/util/private/__gnuplot_has_feature__.m, scripts/plot/util/private/__gnuplot_has_terminal__.m, scripts/plot/util/private/__gnuplot_open_stream__.m, scripts/plot/util/private/__gnuplot_print__.m, scripts/plot/util/private/__gnuplot_version__.m, scripts/plot/util/private/__go_draw_axes__.m, scripts/plot/util/private/__go_draw_figure__.m, scripts/plot/util/private/__print_parse_opts__.m, scripts/plot/util/private/__tight_eps_bbox__.m, scripts/plot/util/refresh.m, scripts/plot/util/refreshdata.m, scripts/plot/util/saveas.m, scripts/plot/util/shg.m, scripts/plot/util/struct2hdl.m, scripts/plot/util/subplot.m: Moved from plot to subdir util. * etc/HACKING: Updated directory structure info. * scripts/Makefile.am, scripts/plot/appearance/module.mk, scripts/plot/draw/module.mk, scripts/plot/util/module.mk: Added new directories to build system.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/plot/draw/surfl.m	Fri Oct 04 17:09:08 2013 -0700
@@ -0,0 +1,213 @@
+## Copyright (C) 2009-2012 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} {} surfl (@var{z})
+## @deftypefnx {Function File} {} surfl (@var{x}, @var{y}, @var{z})
+## @deftypefnx {Function File} {} surfl (@dots{}, @var{lsrc})
+## @deftypefnx {Function File} {} surfl (@var{x}, @var{y}, @var{z}, @var{lsrc}, @var{P})
+## @deftypefnx {Function File} {} surfl (@dots{}, "cdata")
+## @deftypefnx {Function File} {} surfl (@dots{}, "light")
+## @deftypefnx {Function File} {} surfl (@var{hax}, @dots{})
+## @deftypefnx {Function File} {@var{h} =} surfl (@dots{})
+##
+## Plot a 3-D surface using shading based on various lighting models.
+##
+## The surface mesh is plotted using shaded rectangles.  The vertices of the
+## rectangles [@var{x}, @var{y}] are typically the output of @code{meshgrid}.
+## over a 2-D rectangular region in the x-y plane.  @var{z} determines the
+## height above the plane of each vertex.  If only a single @var{z} matrix is
+## given, then it is plotted over the meshgrid
+## @code{@var{x} = 1:columns (@var{z}), @var{y} = 1:rows (@var{z})}.
+## Thus, columns of @var{z} correspond to different @var{x} values and rows
+## of @var{z} correspond to different @var{y} values.
+##
+## The default lighting mode @qcode{"cdata"}, changes the cdata property of the
+## surface object to give the impression of a lighted surface.
+## @strong{Warning:} The alternative mode @qcode{"light"} mode which creates a
+## light object to illuminate the surface is not implemented (yet).
+##
+## The light source location can be specified using @var{lsrc}.  It can be given
+## as a 2-element vector [azimuth, elevation] in degrees, or as a 3-element
+## vector [lx, ly, lz].  The default value is rotated 45 degrees
+## counterclockwise to the current view.
+##
+## The material properties of the surface can specified using a 4-element
+## vector @var{P} = [@var{AM} @var{D} @var{SP} @var{exp}] which defaults to
+## @var{p} = [0.55 0.6 0.4 10].
+##
+## @table @asis
+## @item @qcode{"AM"} strength of ambient light
+##
+## @item @qcode{"D"} strength of diffuse reflection
+##
+## @item @qcode{"SP"} strength of specular reflection
+##
+## @item @qcode{"EXP"} specular exponent
+## @end table
+##
+## If the first argument @var{hax} is an axes handle, then plot into this axis,
+## rather than the current axes returned by @code{gca}.
+##
+## The optional return value @var{h} is a graphics handle to the created
+## surface object.
+##
+## Example:
+##
+## @example
+## @group
+## colormap (bone (64));
+## surfl (peaks);
+## shading interp;
+## @end group
+## @end example
+## @seealso{diffuse, specular, surf, shading, colormap, caxis}
+## @end deftypefn
+
+## Author: Kai Habel <kai.habel@gmx.de>
+
+function h = surfl (varargin)
+
+  [hax, varargin, nargin] = __plt_get_axis_arg__ ("surfl", varargin{:});
+
+  if (nargin == 0)
+    print_usage ();
+  endif
+
+  ## Check for lighting type.
+  use_cdata = true;
+  if (ischar (varargin{end}))
+    switch (tolower (varargin{end}))
+      case "light"
+        warning ("surfl: light method not supported (yet), using cdata method instead");
+        ## This can be implemented when light objects are supported.
+        use_cdata = false;
+      case "cdata"
+        use_cdata = true;
+      otherwise
+        error ("surfl: unknown lighting method");
+    endswitch
+    varargin(end) = [];
+  endif
+
+  ## Check for reflection properties argument.
+  ##
+  ## r = [ambient light strength,
+  ##      diffuse reflection strength,
+  ##      specular reflection strength,
+  ##      specular shine]
+  if (isnumeric (varargin{end}) && length (varargin{end}) == 4)
+    r = varargin{end};
+    varargin(end) = [];
+  else
+    ## Default values.
+    r = [0.55, 0.6, 0.4, 10];
+  endif
+
+  ## Check for light vector (lv) argument.
+  have_lv = false;
+  if (isnumeric (varargin{end}))
+    len = numel (varargin{end});
+    lastarg = varargin{end};
+    if (len == 3)
+      lv = lastarg;
+      varargin(end) = [];
+      have_lv = true;
+    elseif (len == 2)
+      [lv(1), lv(2), lv(3)] = sph2cart ((lastarg(1) - 90) * pi/180, 
+                                         lastarg(2) * pi/180,
+                                         1.0);
+      varargin(end) = [];
+      have_lv = true;
+    endif
+  endif
+
+  oldfig = [];
+  if (! isempty (hax))
+    oldfig = get (0, "currentfigure");
+  endif
+  unwind_protect
+    hax = newplot (hax);
+
+    htmp = surface (varargin{:});
+    if (! ishold (hax))
+      set (hax, "view", [-37.5, 30],
+                "xgrid", "on", "ygrid", "on", "zgrid", "on", "clim", [0 1]);
+    endif
+
+    ## Get view vector (vv).
+    [az, el] = view ();
+    vv = sph2cart ((az - 90) * pi/180.0, el * pi/180.0, 1.0);
+
+    if (! have_lv)
+      ## Calculate light vector (lv) from view vector.
+      phi = pi / 4;  # 45 degrees
+      R = [cos(phi), -sin(phi), 0;
+           sin(phi),  cos(phi), 0;
+           0,         0,        1];
+      lv = (R * vv.').';
+    endif
+
+    vn = get (htmp, "vertexnormals");
+    dar = get (hax, "plotboxaspectratio");
+    vn(:,:,1) *= dar(1);
+    vn(:,:,2) *= dar(2);
+    vn(:,:,3) *= dar(3);
+
+    ## Normalize vn.
+    vn ./= repmat (sqrt (sumsq (vn, 3)), [1, 1, 3]);
+    [nr, nc] = size (get (htmp, "zdata"));
+
+    ## Ambient, diffuse, and specular term.
+    cdata = (  r(1) * ones (nr, nc)
+             + r(2) * diffuse  (vn(:,:,1), vn(:,:,2), vn(:,:,3), lv)
+             + r(3) * specular (vn(:,:,1), vn(:,:,2), vn(:,:,3), lv, vv, r(4)));
+    cdata ./= sum (r(1:3));
+
+    set (htmp, "cdata", cdata);
+
+  unwind_protect_cleanup
+    if (! isempty (oldfig))
+      set (0, "currentfigure", oldfig);
+    endif
+  end_unwind_protect
+
+  if (nargout > 0)
+    h = htmp;
+  endif
+
+endfunction
+
+
+%!demo
+%! clf;
+%! [X,Y,Z] = sombrero ();
+%! colormap (copper (64));
+%! surfl (X,Y,Z);
+%! shading interp;
+%! title ('surfl() with defaults');
+
+%!demo
+%! clf;
+%! [X,Y,Z] = sombrero ();
+%! colormap (copper (64));
+%! [az, el] = view ();
+%! surfl (X,Y,Z, [az+225,el], [0.2 0.6 0.4 25]);
+%! shading interp;
+%! title ('surfl() with lighting vector and material properties');
+