//@version=5
indicator("Bollinger Bands with Candlestick Patterns", overlay=true)
// Input parameters
length = input.int(20, title="Bollinger Bands Length")
src = input(close, title="Source")
mult = input.float(2.0, title="Bollinger Bands Multiplier")
showCandlestickPatterns = input.bool(true, title="Enable Candlestick Patterns")
// Bollinger Bands calculation
basis = ta.sma(src, length)
dev = mult * ta.stdev(src, length)
upper = basis + dev
lower = basis - dev
// Plot Bollinger Bands
plot(basis, color=color.blue, title="Basis")
p1 = plot(upper, color=color.green, title="Upper Band")
p2 = plot(lower, color=color.red, title="Lower Band")
fill(p1, p2, color=color.new(color.green, 90))
// Candlestick patterns
bullishEngulfing = ta.crossover(close, open[1]) and close > open and open <
close[1]
bearishEngulfing = ta.crossunder(close, open[1]) and close < open and open >
close[1]
doji = math.abs(open - close) / (high - low) < 0.1
// Buy and sell signals
buySignal = bullishEngulfing and close < lower
sellSignal = bearishEngulfing and close > upper
// Highlight candlestick patterns
if (showCandlestickPatterns)
bgcolor(bullishEngulfing ? color.new(color.green, 80) : na, title="Bullish
Engulfing Highlight")
bgcolor(bearishEngulfing ? color.new(color.red, 80) : na, title="Bearish
Engulfing Highlight")
bgcolor(doji ? color.new(color.orange, 80) : na, title="Doji Highlight")
// Plot buy and sell signals
plotshape(buySignal, style=shape.labelup, location=location.belowbar,
color=color.new(color.green, 0), size=size.small, title="Buy Signal", text="BUY")
plotshape(sellSignal, style=shape.labeldown, location=location.abovebar,
color=color.new(color.red, 0), size=size.small, title="Sell Signal", text="SELL")
