Refresh annotate on figure in loop

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Tharon 2020-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/607676-refresh-annotate-on-figure-in-loop

评论： Tharon 2020-10-9

Hello.

I have read several other solutions that use various methods to replace an annotation with each figure refresh, but none of them seem to work for me. The annotations just keep stacking to the side of the first.

I've tried the solutions found here (to no avail):

https://www.mathworks.com/matlabcentral/answers/334288-how-do-i-delete-all-annotations-on-a-figure-but-not-do-clf

https://www.mathworks.com/matlabcentral/answers/423459-how-to-refresh-annotation-after-each-frame

https://www.mathworks.com/matlabcentral/answers/398319-anottations-are-overlapping-in-each-loop-interaction

figure;
a1 = [];
a2 = [];
for k = 1:K
    %compute indices for the current frame
    n = (1:N)+(N*(k-1));
    
    %signal 1
    x = s1(n);
    E_m1(k) = (x'*x)/N; %Normalized frame energy
    
    subplot(211);
    plot(n,s1(n),'b',n,e(n),'g:');
    
    %annotation stuff
    str1 = sprintf('NFE %d', E_m1);
    dim1 = [0.662 0.622 .3 .3];
    delete(a1);
    a1 = annotation('textbox',dim1,'string',str1,'FitBoxToText','on');
    
    %pause between frames, waiting for keypress
    pause(1)
    
end

Thanks for your time.

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回答（1 个）

Rik 2020-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/607676-refresh-annotate-on-figure-in-loop#answer_508606

Create the annotation object once, and update the String property inside your loop.

I would suggest drawnow to trigger the update of the graphics and to process any queued callbacks (e.g. those triggered by keypresses).

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Tharon 2020-10-8

Thank you, I will try this soon.

Tharon 2020-10-9

Thanks for all of your help so far Rik, but I am still having trouble. I implemented the changes you suggested. Now it seems that instead of stacking the new annotations to the right, it stacks them under the previous: