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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 ## Undocumented internal function. |
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20 |
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21 function [c, h] = __contour__ (varargin) |
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22 |
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23 ax = varargin{1}; |
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24 z = varargin{2}; |
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25 |
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26 if (ischar (z)) |
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27 if (strcmp (z, "none")) |
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28 z = NaN; |
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29 elseif (strcmp (z, "base")) |
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30 if (nargin == 1) |
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31 z = varargin{1}; |
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32 else |
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33 z = varargin{3}; |
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34 endif |
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35 z = 2 * (min (z(:)) - max (z(:))); |
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36 elseif (! strcmp (z, "level")) |
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37 error ("unrecognized z argument"); |
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38 endif |
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39 endif |
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40 |
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41 [c, lev] = contourc (varargin{3:end}); |
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42 |
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43 ## Decode contourc output format. |
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44 i1 = 1; |
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45 h = []; |
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46 while (i1 < length (c)) |
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47 clev = c(1,i1); |
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48 clen = c(2,i1); |
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49 |
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50 if (all (c(:,i1+1) == c(:,i1+clen))) |
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51 p = c(:, i1+1:i1+clen-1); |
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52 else |
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53 p = [c(:, i1+1:i1+clen), NaN(2, 1)]; |
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54 endif |
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55 |
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56 if (isnan (z)) |
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57 h = [h; patch(ax, p(1,:), p(2,:), "facecolor", "none", |
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58 "edgecolor", "flat", "cdata", clev)]; |
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59 elseif (!ischar(z)) |
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60 h = [h; patch(ax, p(1,:), p(2,:), z * ones (1, columns (p)), "facecolor", |
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61 "none", "edgecolor", "flat", "cdata", clev)]; |
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62 else |
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63 h = [h; patch(ax, p(1,:), p(2,:), clev * ones (1, columns (p)), |
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64 "facecolor", "none", "edgecolor", "flat", "cdata", clev)]; |
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65 endif |
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66 i1 += clen+1; |
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67 endwhile |
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68 |
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69 endfunction |
