How to make a video from comet(x, y) command?

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N/A
N/A 2023-11-6
回答： Walter Roberson 2024-1-2
I am trying to record a movie using the comet(x, y) command. To record a movie I use the following commands:
drawnow
movieVector(k) = getframe(gcf);
these are inside a lopp and:
v = VideoWriter('L3 Orbits', 'MPEG-4');
v.FrameRate = 100;
open(v);
writeVideo(v, movieVector)
close(v);
which are outside of the loop.
The issue is I need to capture more frames than just one frame per trajectory. I don't know how to do this.

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采纳的回答

Walter Roberson
Walter Roberson 2024-1-2
You cannot do this while using comet() . comet() does not return until all of the drawing is complete .
These days comet() is implemented in terms of animatedLine() and addpoints() and drawnow() . That is probably the same strategy you should use to create the movie.

更多回答（1 个）

Balaji
Balaji 2023-11-7
Hi Mark,
To capture more frames per trajectory when recording a movie using the `comet` command in MATLAB, you can modify your code as follows:
v = VideoWriter('L3 Orbits', 'MPEG-4');
v.FrameRate = 100;
open(v);
for k = 1:numTrajectories
comet(x, y);
numFramesPerTrajectory = 100;
movieVector = struct('cdata', cell(1, numFramesPerTrajectory), 'colormap', cell(1, numFramesPerTrajectory));
for frame = 1:numFramesPerTrajectory
drawnow;
movieVector(frame) = getframe(gcf);
end
writeVideo(v, movieVector);
end
close(v);
Thanks,
Balaji
  2 个评论
N/A
N/A 2023-11-7
I still do not get a video output.
I've attached the main script 'Comet_Plot.m' and the supporting function files: 'pcr3bp.m', 'trajGet3BP.m', and 'Rotation_Rot2Iner.m'.
Balaji
Balaji 2024-1-2
Please insert the following line of code after the `movie_vector` has finished updating, at line 109 in `Comet_Plot.m`:
writeVideo(v, movieVector);

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