StochRSI with Volatility Bands [LazyBear]

//
// @author LazyBear
// List of all my indicators: https://www.tradingview.com/v/4IneGo8h/
//
study(title="Stochastic RSI with Volatility Bands [LazyBear]", shorttitle="StochRSIBB_LB")
source = close
lengthRSI = input(14, minval=1), lengthStoch = input(14, minval=1)
smoothK = input(3, minval=1), smoothD = input(3, minval=1)
rsi1 = rsi(source, lengthRSI)
k = sma(stoch(rsi1, rsi1, rsi1, lengthStoch), smoothK)
d = sma(k, smoothD)
plot(k, color=blue)
plot(d, color=orange)
h0 = hline(80)
h1 = hline(20)
fill(h0, h1, color=purple, transp=80)

// Calc volatility bands
length=input(20, title="BB Length"), mult=input(2.0, title="BB stdev multiplier")
x=k
srcx=x
basisx=sma(srcx, length)
devx = (mult * stdev(srcx, length))
ulx = (basisx + devx)
llx = (basisx - devx)
plot(x>=ulx? x : na, color=blue, style=cross, linewidth=3 )
plot(x<=llx? x : na, color=blue, style=cross, linewidth=3 )