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1 ## Copyright (C) 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2002, 2004, |
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2 ## 2005, 2006, 2007 John W. Eaton |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 3 of the License, or (at |
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9 ## your option) any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, see |
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18 ## <http://www.gnu.org/licenses/>. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} @var{h} = {} surface (@var{x}, @var{y}, @var{z}, @var{c}) |
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22 ## @deftypefnx {Function File} @var{h} = {} surface (@var{x}, @var{y}, @var{z}) |
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23 ## Plot a surface graphic object given matrices @var{x}, and @var{y} from @code{meshgrid} and |
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24 ## a matrix @var{z} corresponding to the @var{x} and @var{y} coordinates of |
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25 ## the surface. If @var{x} and @var{y} are vectors, then a typical vertex |
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26 ## is (@var{x}(j), @var{y}(i), @var{z}(i,j)). Thus, columns of @var{z} |
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27 ## correspond to different @var{x} values and rows of @var{z} correspond |
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28 ## to different @var{y} values. |
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29 ## @seealso{surf, mesh, patch, line} |
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30 ## @end deftypefn |
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31 |
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32 ## Author: jwe |
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33 |
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34 function h = surface (x, y, z, c) |
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35 |
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36 ax = gca (); |
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37 |
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38 if (nargin == 1) |
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39 c = z = x; |
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40 if (ismatrix (z)) |
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41 [nr, nc] = size (z); |
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42 x = 1:nc; |
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43 y = (1:nr)'; |
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44 else |
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45 error ("surface: argument must be a matrix"); |
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46 endif |
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47 elseif (nargin == 3) |
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48 c = z; |
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49 if (isvector (x) && isvector (y) && ismatrix (z)) |
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50 if (rows (z) == length (y) && columns (z) == length (x)) |
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51 x = x(:)'; |
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52 y = y(:); |
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53 else |
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54 error ("surface: rows (z) must be the same as length (y) and columns (z) must be the same as length (x)"); |
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55 endif |
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56 elseif (ismatrix (x) && ismatrix (y) && ismatrix (z)) |
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57 if (! (size_equal (x, y) && size_equal (x, z))) |
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58 error ("surface: x, y, and z must have same dimensions"); |
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59 endif |
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60 else |
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61 error ("surface: x and y must be vectors and z must be a matrix"); |
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62 endif |
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63 elseif (nargin == 4) |
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64 if (! size_equal (z, c)) |
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65 error ("surface: z and c must have same size"); |
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66 endif |
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67 if (isvector (x) && isvector (y) && ismatrix (z)) |
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68 if (rows (z) == length (y) && columns (z) == length (x)) |
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69 x = x(:)'; |
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70 y = y(:); |
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71 else |
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72 error ("surface: rows (z) must be the same as length (y) and columns (z) must be the same as length (x)"); |
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73 endif |
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74 elseif (ismatrix (x) && ismatrix (y) && ismatrix (z)) |
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75 if (! (size_equal (x, y) && size_equal (x, z))) |
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76 error ("surface: x, y, and z must have same dimensions"); |
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77 endif |
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78 else |
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79 error ("surface: x and y must be vectors and z must be a matrix"); |
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80 endif |
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81 else |
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82 print_usage (); |
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83 endif |
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84 |
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85 ## Make a default surface object. |
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86 tmp = __go_surface__ (ax, "xdata", x, "ydata", y, "zdata", z, "cdata", c); |
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87 set (tmp, "facecolor","flat"); |
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88 |
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89 if (! ishold ()) |
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90 set (ax, "view", [0, 90], "box", "off", "xgrid", "on", "ygrid", "on", "zgrid", "on"); |
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91 endif |
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92 |
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93 if (nargout > 0) |
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94 h = tmp; |
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95 endif |
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96 |
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97 endfunction |
