update packages

[CreaPhase.git] / octave_packages / m / plot / surfc.m

diff --git a/octave_packages/m/plot/surfc.m b/octave_packages/m/plot/surfc.m
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+## Copyright (C) 1996-2012 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} {} surfc (@var{x}, @var{y}, @var{z})
+## Plot a surface and contour given matrices @var{x}, and @var{y} from
+## @code{meshgrid} and a matrix @var{z} corresponding to the @var{x} and
+## @var{y} coordinates of the mesh.  If @var{x} and @var{y} are vectors,
+## then a typical vertex is (@var{x}(j), @var{y}(i), @var{z}(i,j)).  Thus,
+## columns of @var{z} correspond to different @var{x} values and rows of
+## @var{z} correspond to different @var{y} values.
+## @seealso{meshgrid, surf, contour}
+## @end deftypefn
+
+function h = surfc (varargin)
+
+  newplot ();
+
+  tmp = surface (varargin{:});
+
+  ax = get (tmp, "parent");
+
+  set (tmp, "facecolor", "flat");
+
+  if (! ishold ())
+    set (ax, "view", [-37.5, 30],
+         "xgrid", "on", "ygrid", "on", "zgrid", "on");
+  endif
+
+  drawnow ();
+  zmin = get (ax, "zlim")(1);
+
+  # don't pass axis handle and/or string arguments to __contour__()
+  stop_idx = nargin;
+  for i = 2 : nargin
+    if (ischar (varargin{i}))
+      stop_idx = i - 1;
+      break;
+    endif
+  endfor
+
+  start_idx = 1;
+  if (ishandle (varargin{1}))
+    start_idx = 2;
+  endif
+
+  if (stop_idx - start_idx == 1 || stop_idx - start_idx == 3)
+    #don't pass a color matrix c to __contour__
+    stop_idx -= 1;
+  endif
+
+  [c, tmp2] = __contour__ (ax, zmin, varargin{start_idx:stop_idx});
+
+  tmp = [tmp; tmp2];
+
+  if (nargout > 0)
+    h = tmp;
+  endif
+
+endfunction
+
+%!demo
+%! clf
+%! [~,~,Z]=peaks;
+%! surfc(Z);
+
+%!demo
+%! clf
+%! [~,~,Z]=sombrero;
+%! [Fx,Fy] = gradient(Z);
+%! surfc(Z,Fx+Fy);
+%! shading interp;
+
+%!demo
+%! clf
+%! [X,Y,Z]=sombrero;
+%! [~,Fy] = gradient(Z);
+%! surfc(X,Y,Z,Fy);
+%! shading interp;