MATLAB Answers

Variable horizontal alignment of cell array's strings in annotation

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giannit
giannit on 7 Apr 2020
Commented: Ameer Hamza on 29 Apr 2020
In the following example, I'm trying to center align the second string of arrcell while keeping the first and third strings aligned to the left
cases = 18;
percent = 0.3;
dim = [0.1 0.5 0.1 0.1];
arrcell = {['there are ',num2str(cases),' cases'],['- - - -'],['the percent is ',num2str(percent)]};
an = annotation('textbox',dim,'String',arrcell,'FitBoxToText','on');
set(an, {'HorizontalAlignment'}, {'left';'center';'left'});
but I get the error
Error using matlab.graphics.shape.TextBox/set
Value cell array handle dimension must match handle vector length.
What is wrong?
This is what I would like to obtain

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Answers (2)

Ameer Hamza
Ameer Hamza on 7 Apr 2020
Edited: Ameer Hamza on 7 Apr 2020
cases = 18;
percent = 0.3;
dim = [0.1 0.5 0.1 0.1];
arrcell = {['there are ',num2str(cases),' cases'],['- - - -'],['the percent is ',num2str(percent)]};
an1 = annotation('textbox',dim,'String',arrcell(3), 'FitBoxToText','on', ...
'Margin',0, 'EdgeColor', [0 0 0], 'HorizontalAlignment', 'left', ...
'EdgeColor', 'none');
an1.Position(1:2) = dim(1:2);
drawnow;
pos1 = an1.Position;
an2 = annotation('textbox',[pos1(1) pos1(2)+pos1(4) pos1(3) pos1(4)],'String',arrcell(2), ...
'Margin',0, 'EdgeColor', [0 0 0], 'HorizontalAlignment', 'center', ...
'EdgeColor', 'none');
drawnow;
pos2 = an2.Position;
an3 = annotation('textbox',[pos2(1) pos2(2)+pos2(4) pos2(3) pos2(4)],'String',arrcell(1), ...
'Margin',0, 'EdgeColor', [0 0 0], 'HorizontalAlignment', 'left', ...
'EdgeColor', 'none');
pos3 = an3.Position;
annotation('rectangle', [pos1([1 2 3]) pos1(4)*3]+[-0.01 -0.01 0.02 0.02]);

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Ameer Hamza
Ameer Hamza on 7 Apr 2020
Can you tell, which version of MATLAB are you using? When I run this code
cases = 18;
percent = 0.3;
arrcell1 = {['there are ',num2str(cases),' cases']};
arrcell2 = {[''],['- - - -']};
arrcell3 = {[''],[''],['the percent is ',num2str(percent)]};
annotation('textbox',[.1 .5 .24 .15],'String',arrcell1,'HorizontalAlignment','left');
annotation('textbox',[.1 .5 .24 .15],'String',arrcell2,'HorizontalAlignment','center');
annotation('textbox',[.1 .5 .24 .15],'String',arrcell3,'HorizontalAlignment','left');
I get this output
Ameer Hamza
Ameer Hamza on 29 Apr 2020
If it works for on your platform, then you should continue using this code. I tried on macOS using R2018b and R2020a, and in both cases, this code created extra space inside the box.

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KALYAN ACHARJYA
KALYAN ACHARJYA on 7 Apr 2020
Edited: KALYAN ACHARJYA on 7 Apr 2020
cases = 18;
percent = 0.3;
dim = [0.1 0.5 0.1 0.1];
arrcell = {['there are ',num2str(cases),' cases'],['- - - -'],['the percent is ',num2str(percent)]};
an = annotation('textbox',dim,'String',arrcell,'FitBoxToText','on');
set(an, {'HorizontalAlignment'}, {'center'});

  2 Comments

giannit
giannit on 7 Apr 2020
Thank you! Anyway, this is not exactly what I would like to obtain. Instead I would like
  • first string left aligned
  • second string center aligned
  • third string left aligned
This is why I tried with {'left';'center';'left'}` but, it doesn't work.
Any ideas?
Ameer Hamza
Ameer Hamza on 7 Apr 2020
Unfortunately, such a thing is not supported in MATLAB. The only workaround is to draw each component separately. Check the code in my answer. It is cumbersome, to say the least.

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