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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} {} surface (@var{x}, @var{y}, @var{z}, @var{c}) |
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22 ## @deftypefnx {Function File} {} surface (@var{x}, @var{y}, @var{z}) |
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23 ## @deftypefnx {Function File} {} surface (@var{z}, @var{c}) |
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24 ## @deftypefnx {Function File} {} surface (@var{z}) |
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25 ## @deftypefnx {Function File} {} surface (@dots{}, @var{prop}, @var{val}) |
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26 ## @deftypefnx {Function File} {} surface (@var{h}, @dots{}) |
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27 ## @deftypefnx {Function File} {@var{h} = } surface (@dots{}) |
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28 ## Plot a surface graphic object given matrices @var{x}, and @var{y} from |
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29 ## @code{meshgrid} and a matrix @var{z} corresponding to the @var{x} and |
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30 ## @var{y} coordinates of the surface. If @var{x} and @var{y} are vectors, |
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31 ## then a typical vertex is (@var{x}(j), @var{y}(i), @var{z}(i,j)). Thus, |
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32 ## columns of @var{z} correspond to different @var{x} values and rows of |
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33 ## @var{z} correspond to different @var{y} values. If @var{x} and @var{y} |
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34 ## are missing, they are constructed from size of the matrix @var{z}. |
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35 ## |
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36 ## Any additional properties passed are assigned the the surface.. |
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37 ## @seealso{surf, mesh, patch, line} |
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38 ## @end deftypefn |
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39 |
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40 ## Author: jwe |
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41 |
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42 function h = surface (varargin) |
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43 |
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44 if (isscalar (varargin{1}) && ishandle (varargin{1})) |
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45 h = varargin{1}; |
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46 if (! strcmp (get (h, "type"), "axes")) |
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47 error ("surface: expecting first argument to be an axes object"); |
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48 endif |
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49 oldh = gca (); |
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50 unwind_protect |
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51 axes (h); |
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52 [tmp, bad_usage] = __surface__ (h, varargin{2:end}); |
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53 unwind_protect_cleanup |
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54 axes (oldh); |
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55 end_unwind_protect |
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56 else |
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57 [tmp, bad_usage] = __surface__ (gca (), varargin{:}); |
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58 endif |
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59 |
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60 if (bad_usage) |
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61 print_usage (); |
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62 endif |
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63 |
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64 if (nargout > 0) |
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65 h = tmp; |
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66 endif |
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67 endfunction |
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68 |
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69 function [h, bad_usage] = __surface__ (ax, varargin) |
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70 |
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71 bad_usage = false; |
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72 h = 0; |
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73 firststring = nargin; |
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74 for i = 2 : nargin |
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75 if (ischar (varargin{i - 1})) |
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76 firststring = i - 1; |
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77 break; |
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78 endif |
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79 endfor |
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80 |
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81 if (firststring > 5) |
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82 bad_usage = true; |
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83 elseif (firststring == 5) |
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84 x = varargin{1}; |
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85 y = varargin{2}; |
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86 z = varargin{3}; |
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87 c = varargin{4}; |
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88 |
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89 if (! size_equal (z, c)) |
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90 error ("surface: z and c must have same size"); |
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91 endif |
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92 if (isvector (x) && isvector (y) && ismatrix (z)) |
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93 if (rows (z) == length (y) && columns (z) == length (x)) |
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94 x = x(:)'; |
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95 y = y(:); |
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96 else |
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97 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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98 endif |
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99 elseif (ismatrix (x) && ismatrix (y) && ismatrix (z)) |
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100 if (! (size_equal (x, y) && size_equal (x, z))) |
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101 error ("surface: x, y, and z must have same dimensions"); |
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102 endif |
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103 else |
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104 error ("surface: x and y must be vectors and z must be a matrix"); |
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105 endif |
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106 elseif (firststring == 4) |
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107 x = varargin{1}; |
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108 y = varargin{2}; |
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109 z = varargin{3}; |
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110 c = z; |
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111 if (isvector (x) && isvector (y) && ismatrix (z)) |
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112 if (rows (z) == length (y) && columns (z) == length (x)) |
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113 x = x(:)'; |
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114 y = y(:); |
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115 else |
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116 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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117 endif |
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118 elseif (ismatrix (x) && ismatrix (y) && ismatrix (z)) |
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119 if (! (size_equal (x, y) && size_equal (x, z))) |
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120 error ("surface: x, y, and z must have same dimensions"); |
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121 endif |
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122 else |
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123 error ("surface: x and y must be vectors and z must be a matrix"); |
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124 endif |
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125 elseif (firststring == 3) |
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126 z = varargin{1}; |
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127 c = varargin{2}; |
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128 if (ismatrix (z)) |
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129 [nr, nc] = size (z); |
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130 x = 1:nc; |
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131 y = (1:nr)'; |
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132 else |
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133 error ("surface: argument must be a matrix"); |
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134 endif |
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135 elseif (firststring == 2) |
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136 z = varargin{1}; |
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137 c = z; |
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138 if (ismatrix (z)) |
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139 [nr, nc] = size (z); |
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140 x = 1:nc; |
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141 y = (1:nr)'; |
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142 else |
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143 error ("surface: argument must be a matrix"); |
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144 endif |
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145 else |
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146 bad_usage = true; |
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147 endif |
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148 |
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149 if (! bad_usage) |
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150 ## Make a default surface object. |
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151 h = __go_surface__ (ax, "xdata", x, "ydata", y, "zdata", z, "cdata", c); |
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152 set (h, "facecolor","flat"); |
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153 if (firststring < nargin) |
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154 set (h, varargin{firststring:end}); |
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155 endif |
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156 |
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157 if (! ishold ()) |
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158 set (ax, "view", [0, 90], "box", "off", "xgrid", "on", |
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159 "ygrid", "on", "zgrid", "on"); |
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160 endif |
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161 endif |
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162 |
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163 endfunction |
