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1 ## Copyright (C) 2008 Ben Abbott |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2 of the License, or |
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6 ## (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with Octave; see the file COPYING. If not, see |
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15 ## <http://www.gnu.org/licenses/>. |
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16 |
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17 ## -*- texinfo -*- |
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18 ## @deftypefn {Function File} {} comet (@var{y}) |
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19 ## @deftypefnx {Function File} {} comet (@var{x}, @var{y}) |
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20 ## @deftypefnx {Function File} {} comet (@var{x}, @var{y}, @var{p}) |
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21 ## @deftypefnx {Function File} {} comet (@var{ax}, @dots{}) |
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22 ## Produce a simple comet style animation along the trajectory provided by |
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23 ## the input coordinate vecors (@var{x}, @var{y}), where @var{x} will default |
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24 ## to the indices of @var{y}. |
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25 ## |
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26 ## The speed of the comet may be controlled by @var{p}, which represents the |
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27 ## time which passes as the animation passes from one point to the next. The |
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28 ## default for @var{p} is 0.1 seconds. |
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29 ## |
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30 ## If @var{ax} is specified the animition is produced in that axis rather than |
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31 ## the @code{gca}. |
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32 ## |
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33 ## @seealso{comet3} |
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34 ## @end deftypefn |
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35 |
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36 ## Author: Ben Abbott bpabbott@mac.com |
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37 ## Created: 2008-09-21 |
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38 |
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39 function comet (varargin) |
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40 |
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41 if (nargin == 0) |
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42 print_usage (); |
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43 elseif (numel (varargin{1}) == 1 && ishandle (varargin{1})) |
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44 axes (varargin{1}); |
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45 varargin = varargin(2:end); |
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46 numargin = nargin - 1; |
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47 else |
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48 numargin = nargin; |
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49 endif |
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50 |
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51 p = 0.1; |
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52 if (numargin == 1) |
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53 y = varargin{1}; |
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54 x = 1:numel(y); |
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55 elseif (numargin == 2) |
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56 x = varargin{1}; |
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57 y = varargin{2}; |
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58 elseif (numargin == 3) |
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59 x = varargin{1}; |
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60 y = varargin{2}; |
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61 p = varargin{3}; |
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62 else |
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63 print_usage (); |
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64 endif |
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65 |
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66 theaxis = [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 for n = 1:(num+dn); |
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70 m = n - dn; |
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71 m = max ([m, 1]); |
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72 k = min ([n, num]); |
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73 h = plot (x(1:m), y(1:m), "r", x(m:k), y(m:k), "g", x(k), y(k), "ob"); |
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74 axis (theaxis); |
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75 drawnow (); |
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76 pause (p); |
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77 endfor |
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78 |
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79 endfunction |
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80 |
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81 %!demo |
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82 %! close all; |
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83 %! t = 0:.1:2*pi; |
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84 %! x = cos(2*t).*(cos(t).^2); |
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85 %! y = sin(2*t).*(sin(t).^2); |
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86 %! comet(x,y) |
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87 |
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88 |
