//@version=3
study("My Script", overlay=true)
cond = rising(volume,1) and falling(volume[1],1)
hilevel = 0.
hilevel := cond? high[1]:hilevel[1]
lolevel = 0.
lolevel := cond? low[1]:lolevel[1]
plot(hilevel, color=lime, style=stepline)
plot(lolevel, color=red, style=stepline)