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1 ## Copyright (C) 1998, 2000, 2004, 2005, 2007 |
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2 ## Auburn University. All rights reserved. |
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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} {} axis2dlim (@var{axdata}) |
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22 ## Determine axis limits for 2-D data (column vectors); leaves a 10% |
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23 ## margin around the plots. |
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24 ## Inserts margins of +/- 0.1 if data is one-dimensional |
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25 ## (or a single point). |
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26 ## |
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27 ## @strong{Input} |
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28 ## @table @var |
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29 ## @item axdata |
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30 ## @var{n} by 2 matrix of data [@var{x}, @var{y}]. |
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31 ## @end table |
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32 ## |
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33 ## @strong{Output} |
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34 ## @table @var |
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35 ## @item axvec |
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36 ## Vector of axis limits appropriate for call to @command{axis} function. |
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37 ## @end table |
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38 ## @end deftypefn |
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39 |
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40 function axvec = axis2dlim (axdata) |
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41 |
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42 if(isempty(axdata)) |
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43 axdata = 0; |
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44 endif |
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45 |
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46 ## compute axis limits |
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47 minv = min(axdata); |
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48 maxv = max(axdata); |
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49 delv = (maxv-minv)/2; # breadth of the plot |
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50 midv = (minv + maxv)/2; # midpoint of the plot |
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51 axmid = [midv(1), midv(1), midv(2), midv(2)]; |
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52 axdel = [-0.1, 0.1,-0.1,0.1]; # default plot width (if less than 2-d data) |
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53 if(max(delv) == 0) |
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54 if(midv(1) != 0) |
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55 axdel(1:2) = [-0.1*midv(1),0.1*midv(1)]; |
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56 endif |
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57 if(midv(2) != 0) |
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58 axdel(3:4) = [-0.1*midv(2),0.1*midv(2)]; |
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59 endif |
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60 else |
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61 ## they're at least one-dimensional |
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62 tolv = max(1e-8, 1e-8*abs(midv)); |
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63 if(abs(delv(1)) >= tolv(1)) |
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64 axdel(1:2) = 1.1*[-delv(1),delv(1)]; |
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65 endif |
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66 if(abs(delv(2)) >= tolv(2)) |
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67 axdel(3:4) = 1.1*[-delv(2),delv(2)]; |
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68 endif |
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69 endif |
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70 axvec = axmid + axdel; |
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71 endfunction |
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72 |
