Saving animation of projectile motion

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Hi there
I'm struggling to find a way of saving three projectiles on the same graph as a video file. I have three for loops for each iteration that looks like this:
for i1=1:length(Y1(:,1))
addpoints(curve1,Y1(i1,1),Y1(i1,2));
drawnow
pause(0.1)
end
And then the code that actually saves only a piece of the animation so far is:
F(i2) = getframe(gcf);
video = VideoWriter('trajectories.avi', 'MPEG-4');
open(video)
writeVideo(video, F);
close(video)
Please help, it only saves the last trajectory.
Thanks!
  2 Comments
Christo van Rensburg
Christo van Rensburg on 7 Aug 2019
Hi, below is the entire script for the function:
function a = animatevid(Y1, Y2, Y3)
curve1 = animatedline('Color','r','Marker','o');
curve2 = animatedline('Color','b','Marker','^');
curve3 = animatedline('Color','g','Marker','*');
set(gca, 'XLim', [0 100], 'YLim', [-1 8]);
grid on, hold on
xlabel('Distance [m]'), ylabel('Height [m]')
title('Dart Trajectories'),
% --- FOR LOOP FOR ANGLE 1 --- %
for i1=1:length(Y1(:,1))
addpoints(curve1,Y1(i1,1),Y1(i1,2));
drawnow
pause(0.1)
end
pause(0.5)
% --- FOR LOOP FOR ANGLE 2 --- %
for i2=1:length(Y2(:,1))
addpoints(curve2,Y2(i2,1),Y2(i2,2));
drawnow
pause(0.1)
end
pause(0.5)
% --- FOR LOOP FOR ANGLE 3 --- %
for i3=1:length(Y3(:,1))
addpoints(curve3,Y3(i3,1),Y3(i3,2));
drawnow
pause(0.05)
end
legend('Angle 1', 'Angle 2', 'Angle 3')
end

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Answers (2)

KSSV
KSSV on 7 Aug 2019
  1 Comment
Christo van Rensburg
Christo van Rensburg on 7 Aug 2019
I can maybe see how this would help, but how do I apply that to three different for loops instead of one major for loop like in script?

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darova
darova on 7 Aug 2019
Am i correct?
video = VideoWriter('trajectories.avi', 'MPEG-4');
open(video)
for i1 = 1:n1
% draw something
F = getframe;
writeVideo(video, F);
pause(0.02);
end
for i2 = 1:n2
% draw something
F = getframe;
writeVideo(video, F);
pause(0.02);
end
for i3 = 1:n3
% draw something
F = getframe;
writeVideo(video, F);
pause(0.02);
end
close(video)
Or you want three curves drawing simultaneously?
  1 Comment
Christo van Rensburg
Christo van Rensburg on 7 Aug 2019
Hi
No the it plots the three trajectories after each other which is fine. I now get the following error and the mp4-file generated doesn't include the graph axis and legend which I assume has something to do with the error message displayed:
Warning: The video's width and height has been padded to be a multiple
of two as required by the H.264 codec.

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