Display Value in Text Box

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Allison Bushman
Allison Bushman 2019-3-5
评论： Rik 2019-3-5
I am trying to display the value of a in a text box.
a=trapz(cP6-cP7);
str='Area Swept: %d';
annotation('textbox',[0.3 0.5 0.3 0.3],'String',str,'FitBoxToText','on');

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Rik
Rik 2019-3-5
You need to transform your value to text using either sprintf or num2str:
a=trapz(cP6-cP7);
str=sprintf('Area Swept: %d',a);
annotation('textbox',[0.3 0.5 0.3 0.3],'String',str,'FitBoxToText','on');
  2 个评论
Allison Bushman
Allison Bushman 2019-3-5
Thank you. How would I update the value as a point moves?
Rik
Rik 2019-3-5
You can store a handle to the annotation object in a variable, after which you can modifiy the properties as you need to.
%example:
a=10;
figure(1),clf(1)%clear figure (use only for debugging)
str=sprintf('Area Swept: %d',a);
h_annot=annotation(...
'textbox',[0.3 0.5 0.3 0.3],...
'String',str,...
'FitBoxToText','on');
for n=1:10
%move it around randomly
set(h_annot,...
'position',[0.1+rand/5 0.4+rand/5 0.3 0.3],...
'FitBoxToText','on')
pause(1/3)
end
If my answer solved your problem, please consider marking it as accepted answer.

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