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doc: Clarify description of plot format. * scripts/plot/plot.m: Clarify description of plot format.
author Rik <rik@octave.org>
date Tue, 06 Aug 2013 21:23:38 -0700
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children bc924baa2c4e
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1 ## Copyright (C) 2008-2012 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} {} refreshdata ()
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21 ## @deftypefnx {Function File} {} refreshdata (@var{h})
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22 ## @deftypefnx {Function File} {} refreshdata (@var{h}, @var{workspace})
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23 ## Evaluate any @samp{datasource} properties of the current figure and update
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24 ## the plot if the corresponding data has changed.
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25 ##
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26 ## If the first argument @var{h} is a list of graphic handles, then operate
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27 ## on these objects rather than the current figure returned by @code{gcf}.
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28 ##
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29 ## The optional second argument @var{workspace} can take the following values:
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30 ##
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31 ## @table @asis
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32 ## @item "base"
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33 ## Evaluate the datasource properties in the base workspace. (default).
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34 ##
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35 ## @item "caller"
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36 ## Evaluate the datasource properties in the workspace of the function
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37 ## that called @code{refreshdata}.
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38 ## @end table
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39 ##
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40 ## An example of the use of @code{refreshdata} is:
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41 ##
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42 ## @example
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43 ## @group
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44 ## x = 0:0.1:10;
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45 ## y = sin (x);
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46 ## plot (x, y, "ydatasource", "y");
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47 ## for i = 1 : 100
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48 ## pause (0.1);
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49 ## y = sin (x + 0.1*i);
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50 ## refreshdata ();
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51 ## endfor
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52 ## @end group
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53 ## @end example
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54 ## @end deftypefn
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55
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56 function refreshdata (h, workspace)
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57
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58 if (nargin == 0)
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59 h = gcf ();
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60 workspace = "base";
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61 else
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62 if (iscell (h))
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63 h = [h{:}];
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64 endif
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65 if (! all (isfigure (h)))
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66 error ("refreshdata: H must be a list of figure handles");
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67 endif
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68 if (nargin == 1)
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69 workspace = "base";
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70 elseif (nargin == 2)
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71 if (! ischar (workspace)
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72 || ! any (strcmpi (workspace, {"base", "caller"})))
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73 error ('refreshdata: WORKSPACE must be "base" or "caller"');
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74 endif
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75 workspace = tolower (workspace);
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76 else
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77 print_usage ();
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78 endif
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79 endif
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80
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81 h = findall (h);
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82 objs = [];
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83 props = {};
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84
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85 for i = 1 : numel (h)
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86 obj = get (h(i));
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87 flds = fieldnames (obj);
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88 ## regexp() is proper way to do searching, but is 3X slower.
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89 ## Pretty unlikely that people are going to be adding datasource
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90 ## properties that are not, in fact, datasources.
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91 ## m = regexp (flds, '^.+datasource$');
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92 m = strfind (flds, "datasource");
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93 m = flds(!cellfun (@isempty, m));
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94 for j = 1 : numel (m)
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95 if (isempty (obj.(m{j})))
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96 continue; # datasource field doesn't point to anything
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97 endif
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98 expr = obj.(m{j}); # datasource field
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99 val = evalin (workspace, expr);
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100 pdname = m{j}(1:end-6); # property data name without "source"
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101 set (h(i), pdname, val);
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102 endfor
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103 endfor
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104 endfunction
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105
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106
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107 %!demo
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108 %! clf;
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109 %! x = 0:0.1:10;
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110 %! y = sin (x);
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111 %! plot (x, y, 'ydatasource', 'y');
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112 %! title ('refreshdata() showing moving sine curve');
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113 %! axis manual;
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114 %! for i = 1 : 100
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115 %! pause (0);
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116 %! y = sin (x + 0.1 * i);
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117 %! refreshdata (gcf, 'caller');
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118 %! end
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119