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annotate scripts/plot/__clabel__.m @ 8289:ac7f334d9652

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Add contour group objects and the clabel function
author David Bateman <dbateman@free.fr>
date Thu, 30 Oct 2008 00:13:05 +0100
parents
children cadc73247d65
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ac7f334d9652 Add contour group objects and the clabel function
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1 ## Copyright (C) 2008 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 h = __clabel__ (c, v, hparent, LabelSpacing, z, varargin)
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22 ## FIXME
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23 ## Assume that the plot size is 4 by 3 inches.
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24 lims = axis ();
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25 xspacing = 72 * 4 / abs(lims(1) - lims(2));
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26 yspacing = 72 * 3 / abs(lims(3) - lims(4));
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27
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28 if (isscalar (hparent) && ishandle(hparent) &&
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29 strcmp (get (hparent, "type"), "hggroup"))
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30 x = get (hparent, "xdata");
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31 xmin = min (x(:));
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32 xmax = max (x(:));
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33 y = get (hparent, "ydata");
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34 ymin = min (y(:));
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35 ymax = max (y(:));
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36 else
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37 i1 = 1;
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38 while (i1 < length (c))
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39 clev = c(1,i1);
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40 clen = c(2,i1);
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41 p = c(:, i1+1:i1+clen)
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42
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43 xmin = min (c(1,:));
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44 xmax = max (c(1,:));
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45 ymin = min (c(2,:));
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46 ymax = max (c(2,:));
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47
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48 i1 += clen+1;
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49 endwhile
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50 endif
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51
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52 ## Decode contourc output format and place labels.
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53 i1 = 1;
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54 h = [];
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55 while (i1 < length (c))
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56 clev = c(1,i1);
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57 clen = c(2,i1);
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58
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59 if (!isempty (v) && ! any (find (clev == v)))
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60 i1 += clen+1;
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61 continue;
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62 endif
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63
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64 p = c(:, i1+1:i1+clen) .* repmat ([xspacing; yspacing], 1, clen);
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65 d = sqrt (sumsq (diff (p, 1, 2)));
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66 cumd = cumsum (d);
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67 td = sum(d);
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68 ntag = ceil (td / LabelSpacing);
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69
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70 if (all (c(:,i1+1) == c(:,i1+clen)))
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71 Spacing = td / ntag;
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72 pos = Spacing / 2 + [0:ntag-1] * Spacing;
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73 else
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74 pos = zeros(1, ntag);
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75 pos(1) = (td - LabelSpacing * (ntag - 1)) ./ 2;
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76 pos(2:ntag) = pos(1) + [1:ntag-1] * LabelSpacing;
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77 endif
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78
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79 j1 = 2;
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80 tlabel = sprintf ("%g", clev);
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81 for i = 1 : ntag
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82 tagpos = pos(i);
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83
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84 while (j1 < clen && cumd(j1) < tagpos)
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85 j1++;
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86 endwhile
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87 tpos = sum(c(:,i1+j1-1:i1+j1), 2) ./ 2;
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88
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89 if (tpos(1) != xmin && tpos(1) != xmax &&
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90 tpos(2) != ymin && tpos(2) != ymax)
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91 trot = 180 / pi * atan2 (diff (c(2,i1+j1-1:i1+j1)),
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92 diff (c(1,i1+j1-1:i1+j1)));
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93
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94 if (ischar (z))
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95 ht = text (tpos(1), tpos(2), clev, tlabel, "rotation", trot,
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96 "parent", hparent, "horizontalalignment", "center",
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97 "userdata", clev, varargin{:});
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98 elseif (!isempty (z))
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99 ht = text (tpos(1), tpos(2), z, tlabel, "rotation", trot,
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100 "parent", hparent, "horizontalalignment", "center",
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101 "userdata", clev, varargin{:});
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102 else
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103 ht = text (tpos(1), tpos(2), tlabel, "rotation", trot,
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104 "parent", hparent, "horizontalalignment", "center",
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105 "userdata", clev, varargin{:});
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106 endif
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107 h = [h; ht];
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108 endif
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109 endfor
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110 i1 += clen+1;
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111 endwhile
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112 endfunction