This must be very simple, but I didn't find how to do this. I have an important value on x-axis that I would like to draw attention with a vertical line, how can I do this?
This must be very simple, but I didn't find how to do this. I have an important value on x-axis that I would like to draw attention with a vertical line, how can I do this?
I suggest using either QCPItemLine or QCPItemStraightLine. Have a look at the item demo and the website tutorial for items.