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1 ## Copyright (C) 2007 David BAteman |
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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} {@var{c} =} contour3 (@var{z}) |
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21 ## @deftypefnx {Function File} {@var{c} =} contour3 (@var{z}, @var{vn}) |
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22 ## @deftypefnx {Function File} {@var{c} =} contour3 (@var{x}, @var{y}, @var{z}) |
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23 ## @deftypefnx {Function File} {@var{c} =} contour3 (@var{x}, @var{y}, @var{z}, @var{vn}) |
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24 ## @deftypefnx {Function File} {@var{c} =} contour3 (@var{h}, @dots{}) |
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25 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contour3 (@dots{}) |
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26 ## Plot level curves (contour lines) of the matrix @var{z}, using the |
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27 ## contour matrix @var{c} computed by @code{contourc} from the same |
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28 ## arguments; see the latter for their interpretation. The contours are |
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29 ## ploted at the Z level corresponding to their contour. The set of |
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30 ## contour levels, @var{c}, is only returned if requested. For example: |
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31 ## |
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32 ## @example |
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33 ## @group |
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34 ## contour3 (peaks (19)); |
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35 ## hold on |
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36 ## surface (peaks (19), 'FaceColor', 'none', 'EdgeColor', 'black') |
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37 ## colormap hot |
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38 ## @end group |
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39 ## @end example |
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40 ## |
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41 ## The optional input and output argument @var{h} allows an axis handle to |
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42 ## be passed to @code{contour} and the handles to the contour objects to be |
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43 ## returned. |
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44 ## @seealso{contourc, patch, plot} |
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45 ## @end deftypefn |
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46 |
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47 function [c, h] = contour3 (varargin) |
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48 |
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49 if (isscalar (varargin{1}) && ishandle (varargin{1})) |
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50 ax = varargin{1}; |
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51 if (! strcmp (get (ax, "type"), "axes")) |
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52 error ("contour: expecting first argument to be an axes object"); |
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53 endif |
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54 oldh = gca (); |
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55 unwind_protect |
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56 axes (ax); |
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57 newplot (); |
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58 [ctmp, htmp] = __contour__ (ax, varargin{2:end}); |
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59 unwind_protect_cleanup |
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60 axes (oldh); |
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61 end_unwind_protect |
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62 else |
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63 newplot (); |
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64 ax = gca (); |
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65 [ctmp, htmp] = __contour__ (ax, "level", varargin{:}); |
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66 endif |
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67 |
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68 if (! ishold ()) |
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69 set (ax, "view", [-37.5, 30]); |
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70 endif |
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71 |
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72 if (nargout > 0) |
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73 c = ctmp; |
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74 h = htmp |
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75 endif |
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76 |
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77 endfunction |
