Mercurial > hg > octave-nkf
annotate scripts/plot/draw/comet.m @ 17744:d63878346099
maint: Update copyright notices for release.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 23 Oct 2013 22:09:27 -0400 |
parents | 7bb76a22cde1 |
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1 ## Copyright (C) 2008-2013 Ben Abbott |
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2 ## |
11104 | 3 ## This file is part of Octave. |
4 ## | |
5 ## Octave is free software; you can redistribute it and/or modify it | |
6 ## under the terms of the GNU General Public License as published by | |
7 ## the Free Software Foundation; either version 3 of the License, or (at | |
8 ## your option) any later version. | |
9 ## | |
10 ## Octave is distributed in the hope that it will be useful, but | |
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 ## General Public License for more details. | |
14 ## | |
8126 | 15 ## You should have received a copy of the GNU General Public License |
16 ## along with Octave; see the file COPYING. If not, see | |
17 ## <http://www.gnu.org/licenses/>. | |
18 | |
19 ## -*- texinfo -*- | |
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20 ## @deftypefn {Function File} {} comet (@var{y}) |
8126 | 21 ## @deftypefnx {Function File} {} comet (@var{x}, @var{y}) |
22 ## @deftypefnx {Function File} {} comet (@var{x}, @var{y}, @var{p}) | |
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23 ## @deftypefnx {Function File} {} comet (@var{hax}, @dots{}) |
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24 ## Produce a simple comet style animation along the trajectory provided by |
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25 ## the input coordinate vectors (@var{x}, @var{y}). If @var{x} is not |
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26 ## specified it defaults to the indices of @var{y}. |
8126 | 27 ## |
28 ## The speed of the comet may be controlled by @var{p}, which represents the | |
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29 ## time each point is displayed before moving to the next one. The default for |
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30 ## @var{p} is 0.1 seconds. |
8126 | 31 ## |
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32 ## If the first argument @var{hax} is an axes handle, then plot into this axis, |
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33 ## rather than the current axes returned by @code{gca}. |
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34 ## @seealso{comet3} |
8126 | 35 ## @end deftypefn |
36 | |
37 ## Author: Ben Abbott bpabbott@mac.com | |
38 ## Created: 2008-09-21 | |
39 | |
40 function comet (varargin) | |
41 | |
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42 [hax, varargin, nargin] = __plt_get_axis_arg__ ("comet", varargin{:}); |
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43 |
8126 | 44 if (nargin == 0) |
45 print_usage (); | |
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46 elseif (nargin == 1) |
8126 | 47 y = varargin{1}; |
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48 x = 1:numel (y); |
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49 p = 0.1; |
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50 elseif (nargin == 2) |
8126 | 51 x = varargin{1}; |
52 y = varargin{2}; | |
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53 p = 0.1; |
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54 elseif (nargin == 3) |
8126 | 55 x = varargin{1}; |
56 y = varargin{2}; | |
57 p = varargin{3}; | |
58 endif | |
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59 |
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60 oldfig = []; |
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61 if (! isempty (hax)) |
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62 oldfig = get (0, "currentfigure"); |
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63 endif |
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64 unwind_protect |
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65 hax = newplot (hax); |
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66 limits = [min(x), max(x), min(y), max(y)]; |
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67 num = numel (y); |
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68 dn = round (num/10); |
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69 |
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70 hl = plot (x(1), y(1), "color", "r", "marker", "none", |
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71 x(1), y(1), "color", "g", "marker", "none", |
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72 x(1), y(1), "color", "b", "marker", "o"); |
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73 axis (limits); # set manual limits to speed up plotting |
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74 |
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75 for n = 2:(num+dn); |
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76 m = n - dn; |
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77 m = max ([m, 1]); |
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78 k = min ([n, num]); |
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79 set (hl(1), "xdata", x(1:m), "ydata", y(1:m)); |
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80 set (hl(2), "xdata", x(m:k), "ydata", y(m:k)); |
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81 set (hl(3), "xdata", x(k), "ydata", y(k)); |
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82 drawnow (); |
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83 pause (p); |
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84 endfor |
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85 |
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86 unwind_protect_cleanup |
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87 if (! isempty (oldfig)) |
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88 set (0, "currentfigure", oldfig); |
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89 endif |
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90 end_unwind_protect |
8126 | 91 |
92 endfunction | |
93 | |
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94 |
8126 | 95 %!demo |
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96 %! clf; |
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97 %! title ('comet() animation'); |
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98 %! hold on; |
8126 | 99 %! t = 0:.1:2*pi; |
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100 %! x = cos (2*t) .* (cos (t).^2); |
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101 %! y = sin (2*t) .* (sin (t).^2); |
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102 %! comet (x, y, 0.05); |
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103 %! hold off; |
8126 | 104 |