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1 ## Copyright (C) 2010-2011 Ben Abbott and John W. Eaton |
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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} {} comet3 (@var{z}) |
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21 ## @deftypefnx {Function File} {} comet3 (@var{x}, @var{y}, @var{z}, @var{p}) |
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22 ## @deftypefnx {Function File} {} comet3 (@var{ax}, @dots{}) |
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23 ## Produce a simple comet style animation along the trajectory provided by |
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24 ## the input coordinate vectors (@var{x}, @var{y}), where @var{x} will default |
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25 ## to the indices of @var{y}. |
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26 ## |
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27 ## The speed of the comet may be controlled by @var{p}, which represents the |
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28 ## time which passes as the animation passes from one point to the next. The |
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29 ## default for @var{p} is 0.1 seconds. |
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30 ## |
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31 ## If @var{ax} is specified the animation is produced in that axis rather than |
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32 ## the @code{gca}. |
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33 ## @end deftypefn |
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34 |
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35 ## Author: jwe |
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36 ## Created: 2010-12-17 |
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37 |
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38 function comet3 (varargin) |
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39 |
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40 [h, varargin, nargin] = __plt_get_axis_arg__ ("comet3", varargin{:}); |
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41 |
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42 if (nargin == 0 || nargin == 2 || nargin > 4) |
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43 print_usage (); |
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44 elseif (nargin == 1) |
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45 z = varargin{1}; |
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46 x = y = 1:numel(z); |
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47 p = 0.1; |
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48 elseif (nargin == 3) |
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49 x = varargin{1}; |
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50 y = varargin{2}; |
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51 z = varargin{3}; |
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52 p = 0.1; |
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53 elseif (nargin == 4) |
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54 x = varargin{1}; |
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55 y = varargin{2}; |
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56 z = varargin{3}; |
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57 p = varargin{4}; |
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58 endif |
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59 |
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60 oldh = gca (); |
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61 unwind_protect |
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62 axes (h); |
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63 newplot (); |
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64 theaxis = [min(x), max(x), min(y), max(y), min(z), max(z)]; |
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65 num = numel (y); |
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66 dn = round (num/10); |
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67 for n = 1:(num+dn); |
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68 m = n - dn; |
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69 m = max ([m, 1]); |
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70 k = min ([n, num]); |
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71 h = plot3 (x(1:m), y(1:m), z(1:m), "r", x(m:k), y(m:k), z(m:k), "g", |
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72 x(k), y(k), z(k), "ob"); |
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73 axis (theaxis); |
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74 drawnow (); |
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75 pause (p); |
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76 endfor |
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77 unwind_protect_cleanup |
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78 axes (oldh); |
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79 end_unwind_protect |
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80 |
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81 endfunction |
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82 |
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83 %!demo |
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84 %! clf |
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85 %! t = 0:pi/20:5*pi; |
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86 %! comet3 (cos(t), sin(t), t, 0.01); |
