Hey there,
I found out a Kwin Effect called "Mouse Mark" (it's integrated in KDE by default). It allows me to draw to the screen using my mouse. It works pretty fine, I mean the drawings are directly on the screen and I can click through them which is nice.

I wonder if I can to draw lines using this method but via terminal command. For example:
#drawline width x1 y1 x2 y2 color alpha
and this command to draw line with same method which is used in Mouse mark extension.

And if I want to clear all draws to enter #drawline clear for example

Is there anything like that which I can use or is it hard to do that commands myself? Thanks.