Latex interpreter for "Edit field" label in App Designer

Hi everyone,

I'm currently developing a GUI by using Matlab R2021a App Designer. I need to have an "Edit field" label interpreted with latex whose fontsize should be 14. I alreay set the app.EditFiledLabel.fontsize = 14 property in the TEXT inspector and it works proprly. Unfortunately, every time the app is restared the label fontsize always comes back to 12 without any possibility to be modified. I tried to specify the app.EditFiledLabel.fontsize = 14 property at the startup and in some callbacks with no result.

Did anyone have the same issue? Are there suggentions to solve the problem?

Thank you all.

Filippo

[dpb]

I can't reproduce the FontSize behavior with R2019b; the create section of the code sets the FontSize = 14 and shows that way on the running app -- using debugger I can dynamically set the fontsize programmatically.

There's a TMW post that as or R2018b there is no 'Interpreter' property for the text label; that appears to also be true in R2019b; dunno about later release.

What does the creation code section for the control in question show? It's not user-editable in the app designer window, but should show the setting of the font size for the control.

[Filippo Ambrosino]

Hi,

the creation code is correct. I append it here below:

app.EccentricityeEditFieldLabel = uilabel(app.OrbitalparametersPanel);
app.EccentricityeEditFieldLabel.Interpreter = 'latex';
app.EccentricityeEditFieldLabel.FontSize = 14;
app.EccentricityeEditFieldLabel.Position = [2 251 124 22];
app.EccentricityeEditFieldLabel.Text = 'Eccentricity (e):';

The problem arises whenever I restart the app because the label fontsize is no longer 14 but 12 indeed. This happens only if I use the latex interpreter.

Cheers,

Filippo

[dpb]

Well, that would then seem to be a bug.

The suggestion in the TMW link I referred to above was that the workaround for lack of LaTeX interpreter would be to generate the string outside and put it into the field externally/manually. This is obviously limited to static text, of course.

Answer 1

[Mario Malic]

Hi Filippo,

It seems like a weird bug, but this code makes it work. If you add drawnow in startupFcn, the FontSize can be changed, but make sure that the font size is different from the number in the component browser, otherwise it won't be changed.

Credits to TMW Customer Service

function startupFcn(app)
    drawnow  
    app.EditFieldLabel.Text= '\[ x^n + y^n = z^n \]';
    app.EditFieldLabel.FontSize = 25;
end

[Filippo Ambrosino]

Hi,

yes, in Matlab App Designer R2021a the LaTex interpretation has been implemented (I think with bugs).

I use the correct keyword (app.EditFiledLabel.FontSize = 14) to change the fontsize but unfortunately nothing happened...

Cheers,

Filippo

[Mario Malic]

Okay,

I can confirm this on MATLAB Online. It looks like FontSize can't be set with StartupFcn when LaTeX interpreter is used. It can only be changed programmatically. Time for a bug report.

Edit: you can change it programmatically, but I wouldn't consider this as a workaround.

[Filippo Ambrosino]

Hi Mario,

I tried to change it programmatically, but it's still continuing not to work... The fontsize does not increase even though I use a button to change it.

Cheers,

Filippo

[Mario Malic]

Edit: I have updated the answer.

I guess there are some issues with the App Designer, as I've changed it from outside, using the command window.

I have reported this as a bug, so, probably will be fixed in the next update.

What you can also try is to write a function or a script that finds the app handle and changes the fontsize. Then call the script in StartupFcn. I'll try that later unless you do it first.

[Filippo Ambrosino]

Hi Mario,

thanks a lot, your workaround is working! However if you use the latex interpreter, I verified that each property of text label is affected by this weird bug (not only the fontsize).

Anyway, many thanks again.

Cheers,

Filippo