//@version=5
// Bollinger Bands: Realitycheck777 : 14/SEP/2014 11:07 : 2.0
// This displays the traditional Bollinger Bands, the difference is 
// that the 1st and 2nd StdDev are outlined with two colors and two
// different levels, one for each Standard Deviation

strategy(shorttitle='MBB', title='Bollinger Bands', overlay=true, currency=currency.NONE, initial_capital = 100000, default_qty_type = strategy.percent_of_equity, default_qty_value = 100)
src = input(close)
length = input.int(34, minval=1)
mult = input.float(2.0, minval=0.001, maxval=50)

basis = ta.sma(src, length)
dev = ta.stdev(src, length)
dev2 = mult * dev

upper = basis + dev2
lower = basis - dev2

upper1 = basis + dev
lower1 = basis - dev

colorBasis = src >= basis ? color.blue : color.orange

pBasis = plot(basis, linewidth=2, color=colorBasis)
pUpper1 = plot(upper1, color=color.new(color.blue, 0), style=plot.style_circles)
pLower1 = plot(lower1, color=color.new(color.orange, 0), style=plot.style_circles)

fill(pBasis, upper, color=color.new(color.blue, 80))
fill(pUpper1, upper, color=color.new(color.blue, 80))
fill(pBasis, lower, color=color.new(color.orange, 80))
fill(pLower1, lower, color=color.new(color.orange, 80))

longCondition = close > upper
shortCondition = close < lower

if longCondition
    strategy.entry("Long", strategy.long)

if shortCondition
    strategy.entry("Short", strategy.short)

if shortCondition and strategy.position_size > 0
    strategy.close("Long")

if longCondition and strategy.position_size < 0
    strategy.close("Short")