EFFECTIVE RSI

//@version=4
study(title="EFFECTIVE RSI", shorttitle="EFFECTIVE_RSI", format=format.price, precision=2, resolution="")
len = input(14, minval=1, title="Length")
src = input(close, "Source", type = input.source)
up = rma(max(change(src), 0), len)
down = rma(-min(change(src), 0), len)
rsi = down == 0 ? 100 : up == 0 ? 0 : 100 - (100 / (1 + up / down))
plot(rsi, "RSI", color=#8E1599, linewidth=2)
band1 = hline(60, "Upper Band", color=#C0C0C0)
band0 = hline(20, "Lower Band", color=#C0C0C0)
fill(band1, band0, color=color.red, transp=90, title="Background")

band3 = hline(80, "Upper Band", color=#C0C0C0)
band4 = hline(40, "Lower Band", color=#C0C0C0)
fill(band3, band4, color=color.green, transp=90, title="Background")



hline(50, title="Zero", color=color.black, linewidth=1, linestyle=hline.style_solid)

hline(80, title="Zero", color=color.green, linewidth=2, linestyle=hline.style_solid)
hline(60, title="Zero", color=color.red, linewidth=2, linestyle=hline.style_solid)
hline(40, title="Zero", color=color.green, linewidth=2, linestyle=hline.style_solid)
hline(20, title="Zero", color=color.red, linewidth=2, linestyle=hline.style_solid)