Animating a sine wave movie

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tyler brecht
tyler brecht 2014-10-23
评论： Image Analyst 2016-5-12
Hi guys I would like to know how to make a movie of a sine wave using handle graphics and for each frame a for loop with getframe
a = -1; z = 0:pi/1000:2*pi; y = a*sin(z)

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Image Analyst
Image Analyst 2014-10-23
See my attached demo. Just change the surf() call to plot() and it should work.

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Ced
Ced 2014-10-23
编辑：Ced 2014-10-23
Something like that? (reduced the number of frames)
clear all
clc
close all
a = -1;
z = 0:pi/100:2*pi;
y = a*sin(z);
Nz = length(z);
% Set up your plot environment
figure
h = plot(z(1),y(1));
xlim([z(1) z(end)])
ylim([min(y) max(y)])
xlabel('z')
ylabel('a*sin(z)')
legend('my sine function')
init_getframe = struct('cdata',[],'colormap',[]);
frames = repmat(init_getframe, Nz, 1 );
frames(1) = getframe;
% Get frames
for i = 2:Nz
set(h,'XData',z(1:i));
set(h,'YData',y(1:i));
drawnow
frames(i) = getframe;
end
% Play movie
movie(frames)
But from experience, I prefer to save each frame to a file (e.g. .png), and then combine the frames later into a movie.
*EDIT*: I was a bit too slow. Make sure to check out Image Analysts answer for some extra frame size settings etc.
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BHANESH BHADRECHA
BHANESH BHADRECHA 2016-5-12
What if i want to increase the speed of animation, i mean i want to show more data samples at a time.
please reply with an answer.
Image Analyst
Image Analyst 2016-5-12
Set the framerate property of the video writer.

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