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daspect.m: Overhaul function using modern coding practices. * scripts/plot/daspect.m: Overhaul function using modern coding practices.
author Rik <rik@octave.org>
date Fri, 02 Aug 2013 15:03:28 -0700
parents 26589abbc78d
children df4c4b7708a4
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72c96de7a403 maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2007-2012 Kai Habel
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} surf (@var{x}, @var{y}, @var{z})
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21 ## @deftypefnx {Function File} {} surf (@var{z})
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22 ## @deftypefnx {Function File} {} surf (@dots{}, @var{c})
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23 ## @deftypefnx {Function File} {} surf (@dots{}, @var{prop}, @var{val}, @dots{})
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24 ## @deftypefnx {Function File} {} surf (@var{hax}, @dots{})
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25 ## @deftypefnx {Function File} {@var{h} =} surf (@dots{})
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26 ## Plot a 3-D surface mesh.
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27 ##
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28 ## The surface mesh is plotted using shaded rectangles. The vertices of the
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29 ## rectangles [@var{x}, @var{y}] are typically the output of @code{meshgrid}.
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30 ## over a 2-D rectangular region in the x-y plane. @var{z} determines the
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31 ## height above the plane of each vertex. If only a single @var{z} matrix is
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32 ## given, then it is plotted over the meshgrid
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33 ## @code{@var{x} = 1:columns (@var{z}), @var{y} = 1:rows (@var{z})}.
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34 ## Thus, columns of @var{z} correspond to different @var{x} values and rows
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35 ## of @var{z} correspond to different @var{y} values.
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36 ##
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37 ## The color of the surface is computed by linearly scaling the @var{Z} values
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38 ## to fit the range of the current colormap. Use @code{caxis} and/or
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39 ## change the colormap to control the appearance.
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40 ##
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41 ## Optionally, the color of the surface can be specified independently of
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42 ## @var{z} by supplying a color matrix, @var{c}.
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43 ##
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44 ## Any property/value pairs are passed directly to the underlying surface
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45 ## object.
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46 ##
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47 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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48 ## rather than the current axes returned by @code{gca}.
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49 ##
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50 ## The optional return value @var{h} is a graphics handle to the created
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51 ## surface object.
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52 ##
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53 ## Note: The exact appearance of the surface can be controlled with the
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54 ## @code{shading} command or by using @code{set} to control surface object
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55 ## properties.
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56 ## @seealso{ezsurf, surfc, surfl, surfnorm, trisurf, contour, mesh, surface, meshgrid, hidden, shading, colormap, caxis}
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57 ## @end deftypefn
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58
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59 ## Author: Kai Habel <kai.habel@gmx.de>
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60
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61 function retval = surf (varargin)
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62
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63 [hax, varargin] = __plt_get_axis_arg__ ("surf", varargin{:});
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64
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65 oldfig = ifelse (isempty (hax), [], get (0, "currentfigure"));
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66 unwind_protect
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67 hax = newplot (hax);
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69 htmp = surface (varargin{:});
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70
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71 if (! ishold (hax))
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72 set (hax, "view", [-37.5, 30],
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73 "xgrid", "on", "ygrid", "on", "zgrid", "on");
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74 endif
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75
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76 unwind_protect_cleanup
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77 if (! isempty (oldfig))
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78 set (0, "currentfigure", oldfig);
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79 endif
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80 end_unwind_protect
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81
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82 if (nargout > 0)
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83 retval = htmp;
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84 endif
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85
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86 endfunction
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87
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88
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89 %!demo
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90 %! clf;
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91 %! colormap ('default');
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92 %! Z = peaks ();
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93 %! surf (Z);
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94
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95 %!demo
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96 %! clf;
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97 %! colormap ('default');
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98 %! Z = sombrero ();
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99 %! [Fx,Fy] = gradient (Z);
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100 %! surf (Z, Fx+Fy);
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101 %! shading interp;
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102
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103 %!demo
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104 %! clf;
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105 %! colormap ('default');
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106 %! [X,Y,Z] = sombrero ();
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107 %! [~,Fy] = gradient (Z);
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108 %! surf (X, Y, Z, Fy);
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109 %! shading interp;
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110