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

Question

Mark 2023-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/2043552-how-to-make-a-video-from-comet-x-y-command

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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Answer 1

Walter Roberson 2024-1-2

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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.

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Answer 2

Balaji 2023-11-7

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https://ww2.mathworks.cn/matlabcentral/answers/2043552-how-to-make-a-video-from-comet-x-y-command#answer_1347857

在 MATLAB Online 中打开

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);