[RS]ADR channel V0

study("[RS]ADR channel V0", overlay=true)
tf = input(title='Timeframe:', type=string, defval='D')
window = input(title='Time Window:', type=integer, defval=30)
USE_AVGCENTER = input(title='Use Average Center or Open:', type=bool, defval=false)

adr = security(tickerid, tf, sma(tr, window))

middle = security(tickerid, tf, USE_AVGCENTER ? avg(high, low) : open)
upper = middle + adr
lower = middle - adr

plot(middle, title='middle line', color=change(middle)!=0?na:black, linewidth=1)
plot(upper, title='upper line', color=change(upper)!=0?na:black, linewidth=1)
plot(lower, title='lower line', color=change(lower)!=0?na:black, linewidth=1)