Use annotation function changing the string dinamycally

Question

Jose Martinez 2019-2-7

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/443735-use-annotation-function-changing-the-string-dinamycally

评论： Jose Martinez 2019-2-7

Hi,

I want to create a text in a figure but outside the axis, but it has to change with the time according to some pressure sensors. I am using "annotation" function:

loop:

steps=steps+1;
txt = ['Steps number: ' num2str(step_number) ' units'];  
annotation('textbox',[.9 .5 .1 .2],'String',txt,'EdgeColor','none');

The issue is that the value it's being overlapped each iteration. Could someone help please? Thanks

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Answer 1

Rik 2019-2-7

1
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https://ww2.mathworks.cn/matlabcentral/answers/443735-use-annotation-function-changing-the-string-dinamycally#answer_359969

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Create the annotation once, and then only change the string property inside the loop.

figure(1)
txt='';
h_annot=annotation('textbox',[.9 .5 .1 .2],'String',txt,'EdgeColor','none');
for steps=1:5
    step_number=steps;
    txt = sprintf('Steps number: %d units',step_number);
    set(h_annot,'String',txt)
    drawnow%force graphics update, pause(0.001) will work as well
    for k=1:1e6
        1+1;%have some calculation to simulate your actual processing time
    end
end
close(1)