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Deleted double-post in English Forum!

... but I'm repeating myself:
https://qelectrotech.org/forum/viewtopi … 443#p19443

English is not my native language, too, but French would be even worse!

Ich würde auch lieber auf Deutsch antworten, aber das verstehen hier auch nur wenige...

So we stick to English! (I guess, you know how to use online-translators?)

As I wrote in the first few words in first answer:

To be neutral:
It's the Operating-System!
The one you use, changes standard-fonts from version to version, from country to country, from...!

Install the same font you used on the other system and keep your fingers crossed, that this is the solution!

On the other hand, you can use a text-editor to change the font and font-size in the qet-file as the other user suggested in the thread I linked above.

@RedBaron:
Depends on what you modify:
Read the linked thread!
Generally speaking: yes.
But be sure to have a backup!

Do you have information, which fonts are really free to use and re-distributable by an Open-Source-Project, elevatormind?

As we do not speak of DTP or Text-Processing – we still speak of a schematic editor!
I would see a maximum (!) of three fonts: Sans Serif (as default), Monospace and Serif.

Just found these:
https://github.com/liberationfonts/liberation-fonts

Here is a font specifically for CAD
https://github.com/hikikomori82/osifont
and an alternative
https://www.peter-wiegel.de/TGL.html

@plc-user
In my "liberation-fonts" branch, the liberation fonts is directly usable in QET (on all OS, without any extra action needed), but it is not supplied to the OS. But is that really necessary if that is what you mean? I haven't looked at it, but the font should be able to be embedded when you export to PDF for example.
It should definitely be the default font in QET as you say though, otherwise people will probably not use it.

The osi-font could be supplied as well, for those who like it I've actually tried it but personally don't like it and think "regular" fonts look better, but I can imagine there might be some customer somewhere demanding it. It will still be your own choice to use it, so it wouldn't hurt to supply it as well

Osifont und auch die TGL sind TrueType Schriftarten in Anlehnung an die ISO 3098. Diese Norm definiert Schriften wie sie in technischen Zeichnungen genutzt werden. Im deutschen wird sie auch als Normschrift bezeichnet. Alle Cad-Systeme haben entsprechende Schriftarten implementiert, sind aber natürlich nicht frei. Die von von mir verlinkten Schriftarten sind frei verfügbar.
Ich denke eine Schrift nach Norm gehört zu einem Program wie QElectroTech dazu.
Osifont nutze ich problemlos unter Windows und Linux.
Unter linux habe ich jedoch noch kein PDF Export gemacht, das teste ich heute Abend.

With translator:

Osifont and TGL are TrueType fonts based on ISO 3098. This standard defines fonts used in technical drawings. In German, it's also called a standard font. All CAD systems have implemented corresponding fonts, but of course, they aren't free. The fonts I've linked to are freely available.
I think a standardized font is a must for a program like QElectroTech.
I use Osifont without any problems under Windows and Linux.
However, I haven't exported to PDF under Linux yet, I'll test that tonight.

@elevatormind:

Based on your “liberation-fonts” branch including osifont, I have implemented the setting of the default font to "Liberation Sans, 9, Regular"in QET.
As I believe this is inseparable from each other, I am providing the patch here for you to integrate it.

diff --git a/sources/qetapp.cpp b/sources/qetapp.cpp
--- a/sources/qetapp.cpp    2025-03-13 22:43:33.000000000 +0100
+++ b/sources/qetapp.cpp    2025-03-14 16:41:05.253397571 +0100
@@ -1236,7 +1236,7 @@
 /**
     @brief QETApp::diagramTextsFont
     The font to use
-    By default the font is "sans Serif" and size 9.
+    By default the font is "Liberation Sans" and size 9.
     @param size : the size of font
     @return the font to use
 */
@@ -1246,7 +1246,7 @@
 
     //Font to use
     QString diagram_texts_family = settings.value("diagramfont",
-                              "Sans Serif").toString();
+                              "Liberation Sans").toString();
     qreal diagram_texts_size     = settings.value("diagramsize",
                               9.0).toDouble();
 
@@ -1272,14 +1272,14 @@
 
     //Font to use
     QString diagram_texts_item_family = settings.value("diagramitemfont",
-                               "Sans Serif").toString();
+                               "Liberation Sans").toString();
     qreal diagram_texts_item_size     = settings.value("diagramitemsize",
                                9.0).toDouble();
     auto diagram_texts_item_weight =
             static_cast<QFont::Weight>(
                 settings.value("diagramitemweight", QFont::Normal).toInt());
     QString diagram_texts_item_style  = settings.value("diagramitemstyle",
-                               "normal").toString();
+                               "Regular").toString();
 
     if (size != -1.0) {
         diagram_texts_item_size = size;
diff -r -u a/sources/ui/configpage/generalconfigurationpage.cpp b/sources/ui/configpage/generalconfigurationpage.cpp
--- a/sources/ui/configpage/generalconfigurationpage.cpp    2025-03-13 22:43:33.000000000 +0100
+++ b/sources/ui/configpage/generalconfigurationpage.cpp    2025-03-14 17:26:10.217643923 +0100
@@ -86,13 +86,11 @@
     ui->m_border_0->setChecked(settings.value("border-columns_0", false).toBool());
     ui->m_autosave_sb->setValue(settings.value("diagrameditor/autosave-interval", 0).toInt());
     
-    QString fontInfos = settings.value("diagramitemfont").toString() + " " +
-            settings.value("diagramitemsize").toString() + " (" +
-            settings.value("diagramitemstyle").toString() + ")";
+    QString fontInfos = settings.value("diagramitemfont", "Liberation Sans").toString() + " " +
+            settings.value("diagramitemsize", "9").toString() + " (" +
+            settings.value("diagramitemstyle", "Regular").toString() + ")";
     ui->m_font_pb->setText(fontInfos);
 
-    
-    
 
         //Dynamic element text item
     ui->m_dyn_text_rotation_sb->setValue(settings.value("diagrameditor/dynamic_text_rotation", 0).toInt());
@@ -106,7 +104,7 @@
                 QString::number(font.pointSize()) + " (" +
                 font.styleName() + ")";
         ui->m_dyn_text_font_pb->setText(fontInfos);
-    }
+    } else { ui->m_dyn_text_font_pb->setText("Liberation Sans 9 (Regular)"); }
 
         //Independent text item
     ui->m_indi_text_rotation_sb->setValue(settings.value("diagrameditor/independent_text_rotation",0).toInt());
@@ -119,7 +117,7 @@
                             QString::number(font.pointSize()) + " (" +
                             font.styleName() + ")";
         ui->m_indi_text_font_pb->setText(fontInfos);
-    }
+    } else { ui->m_indi_text_font_pb->setText("Liberation Sans 9 (Regular)"); }
     
     ui->m_highlight_integrated_elements->setChecked(settings.value("diagrameditor/highlight-integrated-elements", true).toBool());
     ui->m_default_elements_info->setPlainText(settings.value("elementeditor/default-informations", "").toString());
@@ -399,7 +397,9 @@
 {
     bool ok;
     QSettings settings;
-    QFont font = QFontDialog::getFont(&ok, QFont("Sans Serif", 9), this);
+    QString currentFont = settings.value("diagramitemfont", "Liberation Sans").toString();
+    int currentPointSize = settings.value("diagramitemsize", "9").toInt();
+    QFont font = QFontDialog::getFont(&ok, QFont(currentFont, currentPointSize), this);
     if (ok)
     {
         settings.setValue("diagramitemfont", font.family());
@@ -421,7 +421,9 @@
 {
     bool ok;
     QSettings settings;
-    QFont font = QFontDialog::getFont(&ok, QFont("Sans Serif", 9), this);
+    QFont curFont;
+    curFont.fromString(settings.value("diagrameditor/dynamic_text_font", "Liberation Sans,9,-1,5,50,0,0,0,0,0,Regular").toString());
+    QFont font = QFontDialog::getFont(&ok, QFont(curFont.family(), curFont.pointSize()), this);
     if (ok)
     {
         settings.setValue("diagrameditor/dynamic_text_font", font.toString());
@@ -510,7 +512,9 @@
 {
     bool ok;
     QSettings settings;
-    QFont font = QFontDialog::getFont(&ok, QFont("Sans Serif", 9), this);
+    QFont curFont;
+    curFont.fromString(settings.value("diagrameditor/independent_text_font", "Liberation Sans,9,-1,5,50,0,0,0,0,0,Regular").toString());
+    QFont font = QFontDialog::getFont(&ok, QFont(curFont.family(), curFont.pointSize()), this);
     if (ok)
     {
         settings.setValue("diagrameditor/independent_text_font", font.toString());

At the same time, this also corrects an unattractive feature: When setting the font, the font dialog did not scroll to the current font, but always displayed the default font.

EDIT:
About the licenses: Do you think it is possible to have only one "tab" for all licenses?
The QET-License should of course be the first to display, but I like the idea with the combobox to choose others to view.

EDIT again:
Already have a solution for only having one license tab in about-dialog.
Just waiting for your PR for including the fonts, elevatormind,

Do you think, we should include Symbol-Fonts, too, Laurent?
That would "blow-up" the binary of QET even more!

As already said: I would limit the number of fonts to three Liberation-Fonts (or four including osifont) to have the basic fonts available on all systems with the default set to one of these.
That will possibly be enough for 90% of our users, I think.

And with the possibility to enter/display unicode-signs even with Liberation we'll have many symbols "on board". Sample in screenshot.

There will be no limitation!
It is not so, that we only have the fonts available to use, which are coming with QET:
Still all fonts available on your system can be chosen to use with texts in QET.
So in this point there would be no change to the user!
And if the user is upgrading the QET-version and has set some font in Config-Page they wouldn't even notice a change!

There is no need to hurry, Laurent!

EDIT:

elevatormind already included the fonts in his "liberation-fonts"-Branch and I added a patch for setting default-font to "Liberation Sans" here. See above

But to repeat the reasons, why delivering a few fonts with QET is a good idea:

The user still has complete freedom to do whatever he wants!
If he wants to be compatible with different systems, it is suggested to use the fonts that QET provides.
If he wants to use other fonts, he can and may of course continue to do so!
He just needs to be aware that the particular font he has selected may not be available on other systems. This may even be the case if he re-installs his operating system.
That's why we supply a few fonts that can be used in addition to the fonts already available in the system!