Create visual scripting editor

[Niagarer]

Hey community,
what I want to do is easy (the concept is easy, the implementation, I dont know).
I want to make a visual scripting editor and it should look a bit like Blueprints in the Unreal Engine 4 (no, it will never look as good as UE4 Blueprints, but I want to try to make something useful anyway).
The question is: What should I use for the Graph Editor (it should also be possible to add some handwritten notes in the editor, because maybe one day, I want to bring it to touchscreen devices, such as tablets) and what would you recommend me how to start?
I am familiar with and OpenGl (GLUT) (but I dont like it) and OOP-Languages such as C++, Python, Java etc. I thought, maybe I could use sth like the HTML5 canvas?
And here I would be really happy about some suggentions by you

Thanks for all answers !

[A Former User]

Hi! Maybe you want to study the venerable Diagram Scene Example as a starting point.

[Niagarer]

This post is deleted!

[Niagarer]

@Wieland It looks good for what I want to do, I will read a bit about it, thanks!