Theta and Alpha Symbols In QLabel

Question

I'm a student programmer and I'm using Qt to create a Gui that gets input from users for a simulation. I am trying to use the theta and alpha symbol in a QLabel. I have looked over Qt's QLabel Documentation and found that QLabel does support Unicode. I tried using this unicode(U+0398)for my theta and this Unicode (U+03B1) for my alpha. The problem is I'm not to sure where this unicode should go in the ui. Qt doesn't say anything about it; so its either overlooked or something I should have already known. I tried to put it in the text field. That didn't work.

This is the latest code I tried:

QString alpha;
QString theta;
alpha.setUnicode(U+03B1);
theta.setUnicode(U+0398);
ui->labelExpansionAngle1->setText(alpha);
ui->labelExpansionAngle2->setText(alpha);
ui->labelOrientationAngle->setText(theta);

Then I tried:

ui->labelExpansionAngle1->setText("\u03B1");
ui->labelExpansionAngle2->setText("\u03B1");
ui->labelOrientationAngle->setText("\u0398");

I even tried using some of the other codes from the web pages I posted here. I was hoping that someone could shed some light on how this data needs to be put together. Thanks in advance for any help.

"I tried to put it in the text field." You'll have to include code so we know what you mean by this. — S.Lott, Jan 09 '12 at 20:37

score 5 · Accepted Answer · answered Jan 09 '12 at 21:31

5

Try with:

theta = QChar(0x98, 0x03);
alpha = QChar(0xb1, 0x03);

answered Jan 09 '12 at 21:31

Frank Osterfeld

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That worked great! can I ask where you found this information? – Wylie Coyote SG. Jan 09 '12 at 23:01
1

I was able to solve this by using HTML tagging. For Theta I used: q_E2 For Alpha I used: q_E2 – Wylie Coyote SG. Jan 09 '12 at 23:02
By reading QChar apidocs and having done similar things before. It's the QChar(uchar cell, uchar row) constructor. HTML of course also works if you need it for a QLabel only, the unicode characters are more generic. – Frank Osterfeld Jan 10 '12 at 07:39

score 1 · Answer 2 · answered Aug 23 '20 at 15:19

For those using PyQt5, you can directly set the unicode text to a QLabel through its constructor:

alpha_label = QLabel('\u03b1')

or setText:

alpha_label.setText('\u03b1')

If you need the unicode characters for any other greek letter have a look at:

https://unicode.org/charts/PDF/U0370.pdf

score 0 · Answer 3 · answered Nov 22 '22 at 10:57

0

For those using QT on C++

QString alpha = QChar(0x03B1);
QString theta = QChar(0x03B8);

Use 0x followed by unicode character value. One can find all official unicode characters as mentioned @Pablo Guerrero in the above link

answered Nov 22 '22 at 10:57

Material Coder

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Theta and Alpha Symbols In QLabel

3 Answers3