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annotate scripts/plot/clabel.m @ 11587:c792872f8942

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all script files: untabify and strip trailing whitespace
author John W. Eaton <jwe@octave.org>
date Thu, 20 Jan 2011 17:35:29 -0500
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1 ## Copyright (C) 2008-2011 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} {} clabel (@var{c}, @var{h})
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21 ## @deftypefnx {Function File} {} clabel (@var{c}, @var{h}, @var{v})
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22 ## @deftypefnx {Function File} {} clabel (@var{c}, @var{h}, "manual")
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23 ## @deftypefnx {Function File} {} clabel (@var{c})
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24 ## @deftypefnx {Function File} {} clabel (@var{c}, @var{h})
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25 ## @deftypefnx {Function File} {} clabel (@dots{}, @var{prop}, @var{val}, @dots{})
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26 ## @deftypefnx {Function File} {@var{h} =} clabel (@dots{})
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27 ## Adds labels to the contours of a contour plot. The contour plot is specified
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28 ## by the contour matrix @var{c} and optionally the contourgroup object @var{h}
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29 ## that are returned by @code{contour}, @code{contourf} and @code{contour3}.
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30 ## The contour labels are rotated and placed in the contour itself.
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31 ##
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32 ## By default, all contours are labeled. However, the contours to label can be
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33 ## specified by the vector @var{v}. If the "manual" argument is given then
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34 ## the contours to label can be selected with the mouse.
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35 ##
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36 ## Additional property/value pairs that are valid properties of text objects
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37 ## can be given and are passed to the underlying text objects. Additionally,
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38 ## the property "LabelSpacing" is available allowing the spacing between labels
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39 ## on a contour (in points) to be specified. The default is 144 points, or 2
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40 ## inches.
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41 ##
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42 ## The returned value @var{h} is the set of text object that represent the
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43 ## contour labels. The "userdata" property of the text objects contains the
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44 ## numerical value of the contour label.
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45 ##
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46 ## An example of the use of @code{clabel} is
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47 ##
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48 ## @example
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49 ## @group
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50 ## [c, h] = contour (peaks(), -4 : 6);
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51 ## clabel (c, h, -4 : 2 : 6, 'fontsize', 12);
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52 ## @end group
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53 ## @end example
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54 ##
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55 ## @seealso{contour, contourf, contour3, meshc, surfc, text}
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56 ## @end deftypefn
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57
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58 function retval = clabel (c, varargin)
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59 label_spacing = 2 * 72;
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60 have_hg = false;
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61 have_labelspacing = false;
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62
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63 if (nargin < 1)
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64 print_usage()
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65 elseif (nargin == 1)
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66 hparent = gca ();
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67 else
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68 arg = varargin{1};
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69 if (isscalar (arg) && ishandle(arg)
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70 && strcmp (get (arg, "type"), "hggroup"))
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71 obj = get (arg);
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72 if (! isfield (obj, "contourmatrix"))
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73 error ("clabel: expecting the handle to be a contour group");
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74 endif
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75 hg = arg;
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76 have_hg = true;
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77 varargin(1) = [];
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78 else
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79 hparent = gca ();
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80 endif
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81 endif
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82
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83 if (length(varargin) > 0 && isnumeric (varargin{1}))
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84 v = varargin{1}(:);
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85 varargin(1) = [];
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86 else
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87 v = [];
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88 endif
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89
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90 for i = 1 : length (varargin) - 1
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91 arg = varargin{i};
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92 if (strcmpi (arg, "labelspacing"))
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93 label_spacing = varargin{i+1};
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94 have_labelspacing = true;
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95 varargin(i:i+1) = [];
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96 break;
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97 endif
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98 endfor
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99
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100 for i = 1 : length (varargin)
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101 arg = varargin{i};
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102 if (strcmpi (arg, "manual"))
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103 error ("clabel: manual contouring mode not supported");
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104 endif
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105 endfor
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106
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107 if (have_hg)
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108 if (! isempty (v))
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109 if (have_labelspacing)
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110 set (hg, "textlistmode", "manual", "textlist", v,
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111 "labelspacing", label_spacing, "showtext", "on");
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112 else
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113 set (hg, "textlistmode", "manual", "textlist", v, "showtext", "on");
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114 endif
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115 else
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116 if (have_labelspacing)
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117 set (hg,"showtext", "on", "labelspacing", label_spacing);
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118 else
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119 set (hg,"showtext", "on");
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120 endif
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121 endif
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122 retval = findobj (hg, "type", "text");
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123 if (! isempty (varargin))
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124 set (retval, varargin {:});
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125 endif
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126 else
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127 retval = __clabel__ (c, v, hparent, label_spacing, [], varargin{:});
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128 endif
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129 endfunction
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130
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131 %!demo
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132 %! clf
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133 %! [c, h] = contour (peaks(), -4 : 6);
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134 %! clabel (c, h, -4 : 2 : 6, 'fontsize', 12);
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135
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136 %!demo
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137 %! clf
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138 %! [c, h] = contourf (peaks(), -7 : 6);
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139 %! clabel (c, h, -6 : 2 : 6, 'fontsize', 12);