Search code examples
matlabanimationmatlab-figure

Scale the output of movie() before playing the movie

I'm trying to create a movie() of a flickering checkerboard in matlab. I'm using the following code to create the frames:

close all;

n=80; % length of checkerboard squares in pixels
p=5; % number of checkerboard rows
q=6; % number of checkerboard columns
loops=100;

A=zeros(p*n,q*n,2);
my_checkerboard=logical(checkerboard(n,p,q));
A(:,:,1)=double(my_checkerboard(1:p*n,1:q*n));
A(:,:,2)=ones(p*n,q*n);
%A(:,:,2)=double(~my_checkerboard(1:p*n,1:q*n));
F(loops)=struct('cdata',[],'colormap',[]);

h=figure;
for ii=1:1000
    figure(h);
    imshow(A(:,:,mod(ii,2)+1));
    drawnow;
    F(ii)=getframe;
end

Now if I'm playing the movie like this

close all;
h=figure;
movie(h,F,1,10)

I will be able to scale the movie by drawing the corners of the figure. But if I'm scaling the figure before like this

close all;
h=figure('Position',[2640,280,960,800]);
movie(h,F,1,10)

the movie won't be scaled with the figure. Instead the movie will be played in the bottom left corner of the figure.
I got the feeling that this can be done by scaling not just the figure but also the axis, but I couldn't figure out, how to do it.

EDIT: I would also be happy, if someone could link me some resources on a gif generator or something, that can easily create a scalable flickering checkerboard with customizable numbers of tiles.

Solution

  • I think there is a bug in MATLAB movie...

    Following code works in most cases: 

    close all;

n=80; % length of checkerboard squares in pixels
p=5; % number of checkerboard rows
q=6; % number of checkerboard columns
loops=100;

A=zeros(p*n,q*n,2);
my_checkerboard=logical(checkerboard(n,p,q));
A(:,:,1)=double(my_checkerboard(1:p*n,1:q*n));
A(:,:,2)=ones(p*n,q*n);
%A(:,:,2)=double(~my_checkerboard(1:p*n,1:q*n));
F(loops)=struct('cdata',[],'colormap',[]);

h=figure;
for ii=1:10
    figure(h);
    %imshow(A(:,:,mod(ii,2)+1));
    imshow(A(:,:,mod(ii,2)+1), 'Border', 'tight'); %Show image without borders
    drawnow;
    F(ii)=getframe;
end

savefig(h, 'h.fig') %Save the figure to a file, (not the best solution).

%Playing the movie
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
close all;
h = openfig('h.fig'); %Load the figure

% h=figure;
movie(h,F,1,10)

    Saving and loading the figure, is just a simple way for keeping the dimensions of the original figure.