study("DNV with lines", shorttitle="DNV", precision=0)

val = close * volume 
L0 = input(title="L0", type=integer, defval=0)
L1 = input(title="L1", type=integer, defval=1000000)
L2 = input(title="L2", type=integer, defval=5000000)
L3 = input(title="L3", type=integer, defval=20000000)

x0 = hline(0, color=white, linestyle=solid)
x1 = hline(L1, color=white, linestyle=solid)
x2 = hline(L2, color=white, linestyle=solid)
x3 = hline(L3, color=white, linestyle=solid)

volcolor = close > open ? lime:red
plot(val, title='Volume', color=volcolor, transp=0, linewidth=0, style=columns)

dnvma = sma(val,50)
plot(dnvma, title="DNV MA", style=line, color=orange, transp=0)

fill(hline1=x0, hline2=x1, color=red, transp=80)
fill(hline1=x1, hline2=x2, color=yellow, transp=80)
fill(hline1=x2, hline2=x3, color=green, transp=80)