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scripts/plot/ellipsoid.m

changeset 10289: 4b124317dc38
parent:dbd0c77e575e
author: John W. Eaton <jwe@octave.org>
date: Tue Feb 09 20:58:55 2010 -0500 (52 minutes ago)
permissions: -rw-r--r--
description: base_properties::set_children: account for hidden children 
     1## Copyright (C) 2007, 2008, 2009 Sylvain Pelissier

     2##

     3## This file is part of Octave.

     4##

     5## Octave is free software; you can redistribute it and/or modify it

     6## under the terms of the GNU General Public License as published by

     7## the Free Software Foundation; either version 3 of the License, or (at

     8## your option) any later version.

     9##

    10## Octave is distributed in the hope that it will be useful, but

    11## WITHOUT ANY WARRANTY; without even the implied warranty of

    12## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    13## General Public License for more details.

    14##

    15## You should have received a copy of the GNU General Public License

    16## along with Octave; see the file COPYING.  If not, see

    17## <http://www.gnu.org/licenses/>.

    18

    19## -*- texinfo -*-

    20## @deftypefn {Function File} {[@var{x}, @var{y}, @var{z}] =} ellipsoid (@var{xc},@var{yc}, @var{zc}, @var{xr}, @var{yr}, @var{zr}, @var{n})

    21## @deftypefnx {Function File} {} ellipsoid (@var{h}, @dots{})

    22## Generate three matrices in @code{meshgrid} format that define an

    23## ellipsoid.  Called with no return arguments, @code{ellipsoid} calls

    24## directly @code{surf (@var{x}, @var{y}, @var{z})}.  If an axes handle

    25## is passed as the first argument, the surface is plotted to this

    26## set of axes.

    27## @seealso{sphere}

    28## @end deftypefn

    29

    30## Author: Sylvain Pelissier <sylvain.pelissier@gmail.com>

    31

    32function [xx, yy, zz] = ellipsoid (varargin)

    33

    34  [h, varargin, nargin] = __plt_get_axis_arg__ ((nargout > 0), "ellipsoid", 

    35						varargin{:});

    36

    37  if (nargin != 6 && nargin != 7)

    38    print_usage ();

    39  endif

    40

    41  xc = varargin{1};

    42  yc = varargin{2};

    43  zc = varargin{3};

    44  xr = varargin{4};

    45  yr = varargin{5};

    46  zr = varargin{6};

    47

    48  if (nargin == 6)

    49    n = 20;

    50  else

    51    n = varargin{7};

    52  endif

    53

    54  theta = linspace (0, 2 * pi, n + 1);

    55  phi = linspace (-pi / 2, pi / 2, n + 1);

    56  [theta, phi] = meshgrid (theta, phi);

    57

    58  x = xr .* cos (phi) .* cos (theta) + xc;

    59  y = yr .* cos (phi) .* sin (theta) + yc;

    60  z = zr .* sin (phi) + zc;

    61

    62  if (nargout > 0)

    63    xx = x;

    64    yy = y;

    65    zz = z;

    66  else

    67    surf (h, x, y, z);

    68  endif

    69

    70endfunction

    71

    72%!demo

    73%! ellipsoid (0, 0, 1, 2, 3, 4, 20);