Render text in extension plugin (C++) and others

Development
#1

Hi,

I search to render text (static, then dynamic) with a plugin of extension
type in C++. I do not find the same paint method as Python. Or how do I
handle a engine plugin by an extension plugin ?
(GLWidget->addEngine(myEngine) ?)

In some time, I would like to change the mouse icon by the atom located
below. How do I ?

Regards,
Mickaël Gadroy