How to plot triangle inductor current by having series array

Hi Masters.

There are having the known series of Ipk(t), Ton(t) and Toff(t).

I would like to draw a positive slope of straight-line which connects between the origin and Ipk(t) in Ton(t)

and a negative slop one which connects between Ipk(t) and the end of period.    

How to plot the inductor current by those series? Is the way of using coordinate series?

tks