How to show math symbols like theta

Question

I'm trying to find a way to show math symbols such as \theta, \phi, \dot{\theta}, ..., etc. I couldn't find a way to show these letters in my plot. Does qcustomplot support math symbols? I've tried the following line but very few letters show up but the rest doesn't.

ui->customPlot1->graph(0)->setName(QString("\u0024"));

You need to create a QString properly. http://doc.qt.io/qt-4.8/qstring.html#fromUtf8 http://doc.qt.io/qt-4.8/qstring.html#fromUtf16 — n. m. could be an AI, Apr 17 '16 at 07:34
The correct name for these symbols is greek. Greek symbols are available in some encodings. UTF8 is one of them. As n.m. noticed you just need to properly create a QString from unicode string. — Teivaz, Apr 17 '16 at 10:50
@teivaz, I used theta as an example. Not all math symbols are Greek. — CroCo, Apr 17 '16 at 15:29
@CroCo If you're looking for analogue of LaTex than it seems that there is no support for it right now. — Teivaz, Apr 17 '16 at 15:52

score 4 · Answer 1 · answered Apr 17 '16 at 12:41

4

What you are looking for is:

ui->customPlot1->graph(0)->setName(QString::fromUtf8("\u03B8"));

This for example will give you the small letter theta. Use UTF-8 Encoding Table and Unicode Characters to get your desired letters code.

answered Apr 17 '16 at 12:41

A. Sarid

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This is exactly what I've done but didn't work. Your code shows me a question mark in my plot. – CroCo Apr 17 '16 at 15:28
@CroCo If you can post more from your code and maybe some more information about that question mark so I will be able to look for the reason. I am currently also working on qcustomplot code and I just tried this on my plot and it worked. – A. Sarid Apr 17 '16 at 16:45
@CroCo what are your OS and compiler? – n. m. could be an AI Apr 18 '16 at 10:11
@n.m. Windows 7 and Qt. – CroCo Apr 18 '16 at 16:53
1

Windows doesn't particularly like utf8, you may have to type each individual byte in the `\xPQ` notation. Or try `fromUtf16` and a wide string. – n. m. could be an AI Apr 18 '16 at 18:22

CroCo · Accepted Answer · 2016-04-20T22:14:20.407

2

In my Qt GUI in Windows 7, the following line worked

 title->setText(QString::fromWCharArray(L"\u03B8\u2081(t) vs \u03B8\u2081\u1d48(t)"));

The result is

where \u03B8 is \theta, \u2081 is subscript one, and \u1d48 is subscript d. For the rest of charaters, see this link.

edited Apr 20 '16 at 22:14

answered Apr 20 '16 at 22:08

CroCo

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How to show math symbols like theta

2 Answers2