Ask HN: Any of you summarize lectures with a laptop?

Hello.

I'm a student which try to summarize the course material in my laptop live during class.

I've already found many solutions to entering math formulas quickly. However, I have not found any good solution to enter simple and common graphics (at least in Computer Science). (Such as graphs, timelines, etc.)

Do you have any recommendations? As for now, I simply do not copy any graphical representation.

If nobody will find anything, it could be a fantastic mini application or office plugin to develop.