ডায়নামিক ATR স্টপ লস সেন্টারলাইন কৌশল

/*backtest
start: 2023-01-01 00:00:00
end: 2023-06-24 00:00:00
period: 4h
basePeriod: 15m
exchanges: [{"eid":"Futures_Binance","currency":"BTC_USDT"}]
*/

//@version=4
// Thanks to HPotter for the original code for Center of Gravity Backtest
strategy("Center of Gravity BF 🚀", overlay=true, initial_capital=10000, default_qty_type=strategy.percent_of_equity, default_qty_value=100, commission_type=strategy.commission.percent, commission_value=0.15)

/////////////// Time Frame ///////////////
testStartYear = input(2017, "Backtest Start Year") 
testStartMonth = input(1, "Backtest Start Month")
testStartDay = input(1, "Backtest Start Day")
testPeriodStart = timestamp(testStartYear,testStartMonth,testStartDay, 0, 0)

testStopYear = input(2019, "Backtest Stop Year")
testStopMonth = input(12, "Backtest Stop Month")
testStopDay = input(31, "Backtest Stop Day")
testPeriodStop = timestamp(testStopYear,testStopMonth,testStopDay, 0, 0)

testPeriod() => true

///////////// Center of Gravity /////////////
Length = input(25, minval=1)
m = input(5, minval=0)
Percent = input(6, minval=0, title="COG %")

xLG = linreg(close, Length, m)
xLG1r = xLG + ((close * Percent) / 100)
xLG1s = xLG - ((close * Percent) / 100)

pos = 0.0
pos := iff(close > xLG1r, 1, iff(close < xLG1s, -1, nz(pos[1], 0))) 
possig = iff(pos == 1, 1, iff(pos == -1, -1, pos))

/////////////// Srategy ///////////////
long = possig == 1 
short = possig == -1 

last_long = 0.0
last_short = 0.0
last_long := long ? time : nz(last_long[1])
last_short := short ? time : nz(last_short[1])

long_signal = crossover(last_long, last_short)
short_signal = crossover(last_short, last_long)

last_open_long_signal = 0.0
last_open_short_signal = 0.0
last_open_long_signal := long_signal ? open : nz(last_open_long_signal[1])
last_open_short_signal := short_signal ? open : nz(last_open_short_signal[1])

last_long_signal = 0.0
last_short_signal = 0.0
last_long_signal := long_signal ? time : nz(last_long_signal[1])
last_short_signal := short_signal ? time : nz(last_short_signal[1])

in_long_signal = last_long_signal > last_short_signal
in_short_signal = last_short_signal > last_long_signal

last_high = 0.0
last_low = 0.0
last_high := not in_long_signal ? na : in_long_signal and (na(last_high[1]) or high > nz(last_high[1])) ? high : nz(last_high[1])
last_low := not in_short_signal ? na : in_short_signal and (na(last_low[1]) or low < nz(last_low[1])) ? low : nz(last_low[1])

since_longEntry = barssince(last_open_long_signal != last_open_long_signal[1]) 
since_shortEntry = barssince(last_open_short_signal != last_open_short_signal[1]) 

/////////////// Dynamic ATR Stop Losses ///////////////
atrLkb = input(1, minval=1, title='ATR Stop Period')
atrMult = input(2, step=0.25, title='ATR Stop Multiplier') 
atr1 = atr(atrLkb)

longStop = 0.0
longStop :=  short_signal ? na : long_signal ? close - (atr1 * atrMult) : longStop[1]
shortStop = 0.0
shortStop := long_signal ? na : short_signal ? close + (atr1 * atrMult) : shortStop[1]

/////////////// Execution ///////////////
if testPeriod()
    strategy.entry("Long",  strategy.long, when=long)
    strategy.entry("Short", strategy.short, when=short)
    strategy.exit("Long SL", "Long", stop=longStop, when=since_longEntry > 0)
    strategy.exit("Short SL", "Short", stop=shortStop, when=since_shortEntry > 0)

/////////////// Plotting ///////////////
plot(xLG1r, color=color.lime, title="LG1r")
plot(xLG1s, color=color.red, title="LG1s")
plot(strategy.position_size <= 0 ? na : longStop, title="Long Stop Loss", color=color.yellow, style=plot.style_circles, linewidth=1)
plot(strategy.position_size >= 0 ? na : shortStop, title="Short Stop Loss", color=color.orange, style=plot.style_circles, linewidth=1)
bgcolor(strategy.position_size > 0 ? color.lime : strategy.position_size < 0 ? color.red : color.white, transp=90)
bgcolor(long_signal ? color.lime : short_signal ? color.red : na, transp=60)