I am planning on using Qwt to plot 2D line plots, which will
consist of real time floating point data as a function of time.
I anticipate having two data streams, with separate Y axis
content and a common x axis representing time.
This requirement seems to be fulfilled with Qwt line plots.

However, I have one sort of unique requirement. I need to
have plotted colored vertical lines for the entire range of
Y as various points in the x-axis timeline. These vertical
lines demarcate segments in time. The number of vertical
lines representing the maximum number of segments is no more
than 10 over the entire range of x (time).

Anyone ever attempt this? Any recommendations on the best
way to implement such a thing? Can I achieve this with a separate
data set at a particular value of x?