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annotate scripts/plot/appearance/__clabel__.m @ 20830:b65888ec820e draft default tip gccjit

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dmalcom gcc jit import
author Stefan Mahr <dac922@gmx.de>
date Fri, 27 Feb 2015 16:59:36 +0100
parents 4197fc428c7d
children
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rev   line source
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1 ## Copyright (C) 2008-2015 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 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {@var{h} =} __clabel__ (@var{c}, @var{v}, @var{hparent}, @var{label_spacing}, @var{z}, @var{varargin})
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21 ## Undocumented internal function.
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22 ## @end deftypefn
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23
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24 function h = __clabel__ (c, v, hparent, label_spacing, z, varargin)
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25
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26 hax = ancestor (hparent, "axes");
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27 units = get (hax, "units");
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28 set (hax, "units", "points");
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29 axpos = get (hax, "position");
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30 set (hax, "units", units);
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31 lims = axis ();
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32 xspacing = axpos(3) / (lims(2) - lims (1));
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33 yspacing = axpos(4) / (lims(4) - lims (3));
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34
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35 if (isscalar (hparent) && ishandle (hparent)
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36 && strcmp (get (hparent, "type"), "hggroup"))
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37 x = get (hparent, "xdata");
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38 xmin = min (x(:));
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39 xmax = max (x(:));
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40 y = get (hparent, "ydata");
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41 ymin = min (y(:));
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42 ymax = max (y(:));
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43 else
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44 xmin = xmax = ymin = ymax = NaN;
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45 i = 1;
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46 while (i < length (c))
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47 clen = c(2,i);
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48 data = c(:, i+(1:clen));
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49
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50 xmin = min ([xmin, data(1,:)]);
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51 xmax = max ([xmax, data(1,:)]);
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52 ymin = min ([ymin, data(2,:)]);
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53 ymax = max ([ymax, data(2,:)]);
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54
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55 i += clen+1;
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56 endwhile
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57 endif
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58
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59 ## Decode contourc output format and place labels.
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60 h = [];
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61 i = 1;
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62 while (i < length (c))
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63 clev = c(1,i);
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64 clen = c(2,i);
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65
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66 if (! isempty (v) && ! any (v == clev))
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67 i += clen+1;
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68 continue;
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69 endif
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70
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71 p = bsxfun (@times, c(:, i+(1:clen)), [xspacing; yspacing]);
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72 d = sqrt (sumsq (diff (p, 1, 2)));
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73 cumd = cumsum (d);
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74 td = cumd(end);
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75 ntag = ceil (td / label_spacing);
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76
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77 if (all (c(:,i+1) == c(:,i+clen)))
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78 ## Closed contour
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79 ## FIXME: This spreads the tags uniformly around the contour which
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80 ## looks nice, but it does not respect the label_spacing attribute.
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81 ## Should we follow user input, which can result in two labels being
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82 ## quite close to each other?
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83 spacing = td / ntag;
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84 pos = spacing/2 + spacing*[0:ntag-1];
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85 else
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86 ## Open contour
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87 pos = zeros (1, ntag);
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88 pos(1) = (td - label_spacing*(ntag - 1)) / 2;
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89 pos(2:ntag) = pos(1) + label_spacing*[1:ntag-1];
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90 endif
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91
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92 tlabel = sprintf ("%.5g", clev);
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93
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94 for tagpos = pos
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95
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96 j = find (cumd > tagpos, 1);
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97 if (isempty (j))
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98 j = clen;
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99 endif
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100 tpos = sum (c(:,i+j-1:i+j), 2) / 2;
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101
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102 if ( tpos(1) != xmin && tpos(1) != xmax
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103 && tpos(2) != ymin && tpos(2) != ymax)
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104 trot = 180 / pi * atan2 (diff (c(2,i+j-1:i+j)),
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105 diff (c(1,i+j-1:i+j)));
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106 if (abs (trot) > 90)
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107 trot += 180;
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108 endif
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109 if (ischar (z))
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110 ht = text (tpos(1), tpos(2), clev, tlabel, "rotation", trot,
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111 "horizontalalignment", "center", "userdata", clev,
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112 "parent", hparent, varargin{:});
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113 elseif (! isempty (z))
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114 ht = text (tpos(1), tpos(2), z, tlabel, "rotation", trot,
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115 "horizontalalignment", "center", "userdata", clev,
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116 "parent", hparent, varargin{:});
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117 else
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118 ht = text (tpos(1), tpos(2), tlabel, "rotation", trot,
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119 "horizontalalignment", "center", "userdata", clev,
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120 "parent", hparent, varargin{:});
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121 endif
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122 h = [h; ht];
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123 endif
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124 endfor
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125 i += clen+1;
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126 endwhile
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127
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128 endfunction
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129
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130
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131 ## No test needed for internal helper function.
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132 %!assert (1)
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133