在Matlab GUI中将动画另存为gif

I think I found the problem:

f = handles.axes_threeDOF gets the handle of the axes instead of getting the handle of the figure.

Since I don't know the name of your figure, I can't give a perfect solution.
You may try the following options:

1.Find the name of the figure, and use something like: f = handles.figure_threeDOF;
2. Use f = gcf();, assuming there is only one figure.
3. Use f = handles.axes_threeDOF.Parent; assuming the figure is the "Parent" of the axes.

Update:

After im = frame2im(frame);, you need to crop the relevant part of the image:
Something like: im = im(36:884, 928:1800, :);

与使用固定索引相比，有更健壮的解决方案，但它需要一些有关图形内部结构的知识。

这是重现该问题的代码（而不是图形手柄，而是f轴手柄）：

numpoints = 500;
x = linspace(0,4*pi,numpoints);
y = square(x);
y2 = 3 +square(x+1);
f = figure;
h = animatedline('Color','b','LineWidth',2);
h2 = animatedline('Color','r','LineWidth',2);
grid on;
axis([0,12,-3,+6])

for k = 1:numpoints
    addpoints(h,x(k),y(k))
    addpoints(h2,x(k),y2(k))
    drawnow

    %%% Test %%%
    %The following code demonstrates the problem.
    %f = gca(), returns a handle to the axes, instead of the figure.
    %You should remove the following line for the code to work properly... 
    f = gca();
    %%% Test %%%

    % Capture the plot as an image
    frame = getframe(f);
    im = frame2im(frame);
    [imind,cm] = rgb2ind(im,256);

    % Write to the GIF File
    if k == 1
        imwrite(imind,cm,'test.gif','gif', 'Loopcount',inf); 
    else
        imwrite(imind,cm,'test.gif','gif','WriteMode','append'); 
    end
end

正确代码的结果（无f = gca();）：

错误代码的结果（带有f = gca();）-获取轴手柄而不是图形手柄：