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annotate scripts/plot/feather.m @ 17462:177147bf7b55

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Overhaul use of __pltopt__.m to correctly check for cellstr, not just cell. * scripts/plot/private/__pltopt__.m: Use modern coding conventions. Eliminate unneeded input checking in subfunctions. Remove unused variables. * scripts/plot/contourf.m, scripts/plot/feather.m, scripts/plot/plotmatrix.m, scripts/plot/private/__bar__.m, scripts/plot/private/__quiver__.m, scripts/plot/private/__scatter__.m, scripts/plot/private/__stem__.m, scripts/plot/stairs.m: Use iscellstr, not iscell, to properly validate inputs to __pltopt__.
author Rik <rik@octave.org>
date Mon, 23 Sep 2013 08:55:19 -0700
parents 68bcac3c043a
children bddb9688e41c
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2007-2012 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} {} feather (@var{u}, @var{v})
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21 ## @deftypefnx {Function File} {} feather (@var{z})
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22 ## @deftypefnx {Function File} {} feather (@dots{}, @var{style})
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23 ## @deftypefnx {Function File} {} feather (@var{hax}, @dots{})
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24 ## @deftypefnx {Function File} {@var{h} =} feather (@dots{})
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25 ##
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26 ## Plot the @code{(@var{u}, @var{v})} components of a vector field emanating
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27 ## from equidistant points on the x-axis.
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28 ##
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29 ## If a single complex argument @var{z} is given, then
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30 ## @code{@var{u} = real (@var{z})} and @code{@var{v} = imag (@var{z})}.
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31 ##
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32 ## The style to use for the plot can be defined with a line style @var{style}
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33 ## of the same format as the @code{plot} command.
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34 ##
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35 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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36 ## rather than the current axes returned by @code{gca}.
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37 ##
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38 ## The optional return value @var{h} is a vector of graphics handles to the
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39 ## line objects representing the drawn vectors.
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40 ##
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41 ## @example
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42 ## @group
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43 ## phi = [0 : 15 : 360] * pi/180;
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44 ## feather (sin (phi), cos (phi));
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45 ## @end group
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46 ## @end example
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47 ##
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48 ## @seealso{plot, quiver, compass}
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49 ## @end deftypefn
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50
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51 function retval = feather (varargin)
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52
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53 [hax, varargin, nargin] = __plt_get_axis_arg__ ("feather", varargin{:});
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54
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55 arrowsize = 0.25;
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56
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57 if (nargin == 0)
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58 print_usage ();
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59 elseif (nargin == 1 || (nargin == 2 && ! isnumeric (varargin{2})))
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60 ioff = 2;
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61 z = varargin{1}(:).';
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62 u = real (z);
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63 v = imag (z);
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64 elseif (nargin > 1 && isnumeric (varargin{2}))
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65 ioff = 3;
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66 u = varargin{1}(:).';
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67 v = varargin{2}(:).';
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68 endif
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69
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70 line_spec = "b-";
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71 have_line_spec = false;
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72 while (ioff <= nargin)
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73 arg = varargin{ioff++};
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74 if ((ischar (arg) || iscellstr (arg)) && ! have_line_spec)
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75 [linespec, valid] = __pltopt__ ("feather", arg, false);
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76 if (valid)
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77 line_spec = arg;
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78 have_line_spec = false;
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79 break;
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80 else
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81 error ("feather: invalid linespec");
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82 endif
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83 else
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84 error ("feather: unrecognized argument");
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85 endif
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86 endwhile
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87
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88 ## Matlab draws feather plots, with the arrow head as one continous
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89 ## line, and each arrow separately. This is completely different than
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90 ## quiver and quite ugly.
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91 n = length (u);
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92 xend = [1 : n] + u;
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93 xtmp = [1 : n] + u .* (1 - arrowsize);
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94 yend = v;
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95 ytmp = v .* (1 - arrowsize);
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96 x = [[1 : n]; xend; xtmp - v * arrowsize; xend; ...
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97 xtmp + v * arrowsize];
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98 y = [zeros(1, n); yend; ytmp + u * arrowsize / 3; yend; ...
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99 ytmp - u * arrowsize / 3];
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100
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101 oldfig = [];
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102 if (! isempty (hax))
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103 oldfig = get (0, "currentfigure");
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104 endif
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105 unwind_protect
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106 hax = newplot (hax);
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107 hlist = plot (x, y, line_spec, [1, n], [0, 0], line_spec);
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108 unwind_protect_cleanup
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109 if (! isempty (oldfig))
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110 set (0, "currentfigure", oldfig);
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111 endif
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112 end_unwind_protect
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113
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114 if (nargout > 0)
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115 retval = hlist;
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116 endif
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117
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118 endfunction
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119
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120
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121 %!demo
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122 %! clf;
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123 %! phi = [0 : 15 : 360] * pi/180;
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124 %! feather (sin (phi), cos (phi));
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125 %! axis tight;
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126 %! title ('feather plot');
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127