[RS]Average Variation Bands V0

//@version=2
study(title='[RS]Average Variation Bands V0', shorttitle='AVB', overlay=true)
src = input(close)
length = input(100)
dev1 = input(1, type=float)
dev2 = input(2, type=float)
dev3 = input(3, type=float)
ma = ema(src, length)

high_range = ema(max(ma, high) - ma, length)
low_range = ema(ma - min(ma, low), length)

plot(series=ma, title='', color=color(black, 0), linewidth=2)
plot(series=ma + high_range * dev1, title='', color=color(black, 0))
plot(series=ma + high_range * dev2, title='', color=color(black, 0))
plot(series=ma + high_range * dev3, title='', color=color(black, 0))
plot(series=ma - low_range * dev1, title='', color=color(black, 0))
plot(series=ma - low_range * dev2, title='', color=color(black, 0))
plot(series=ma - low_range * dev3, title='', color=color(black, 0))