Orders, strategies and alerts

// An alert condition: the settings panel lists it, and the alert fires on the bar where the fast average crosses above the slow one.
indicator "Cross alert"
    edition = 1
    display = price

input fast_length: int = 9, name = "Fast length", min = 1
input slow_length: int = 21, name = "Slow length", min = 2
let fast = tech.sma(close, fast_length)
let slow = tech.sma(close, slow_length)
plot(fast, name = "Fast", color = color.green)
plot(slow, name = "Slow", color = color.red)
alert.when(
    tech.crosses_above(fast, slow),
    name = "Fast above slow",
    message = "The fast average crossed above the slow one",
)

// A crossover strategy: buy when the fast average crosses above the slow one, sell the position when it crosses back.
// The tester fills the orders on the synthetic data; costs are set in the setup block.
strategy "Moving average crossover"
    edition = 1
    display = price

setup:
    capital = 10000
    size = sizing.lots(0.1)

input fast_length: int = 10, name = "Fast length", min = 1
input slow_length: int = 30, name = "Slow length", min = 2
let fast = tech.ema(close, fast_length)
let slow = tech.ema(close, slow_length)
if tech.crosses_above(fast, slow)
    orders.enter("Long", side.long)
if tech.crosses_below(fast, slow)
    orders.close("Long")
plot(fast, name = "Fast", color = color.green)
plot(slow, name = "Slow", color = color.red)

// Mean reversion: enter long when the RSI falls below the oversold level, leave when it recovers above the middle.
strategy "RSI reversion"
    edition = 1
    display = price

setup:
    capital = 10000
    size = sizing.lots(0.1)

input length: int = 14, name = "RSI length", min = 2
input oversold: float = 30, name = "Oversold"
input exit_level: float = 55, name = "Exit level"
let value = tech.rsi(close, length)
if tech.crosses_below(value, oversold)
    orders.enter("Long", side.long)
if value > exit_level
    orders.close("Long")
plot(close, name = "Close", color = color.gray)

// A channel breakout: a stop order one tick above the highest high of the last `length` bars, an exit under the lowest low of a shorter window.
strategy "Donchian breakout"
    edition = 1
    display = price

setup:
    capital = 10000
    size = sizing.lots(0.1)

input entry_length: int = 20, name = "Entry length", min = 2
input exit_length: int = 10, name = "Exit length", min = 2
let entry_level = tech.highest(high, entry_length)[1]
let exit_level = tech.lowest(low, exit_length)[1]
if bar.is_closed
    orders.enter("Breakout", side.long, stop = entry_level, expires = 1)
    orders.exit("Leave", "Breakout", stop = exit_level)
plot(entry_level, name = "Entry level", color = color.green)
plot(exit_level, name = "Exit level", color = color.red)

// A position with a protective stop and a target measured in multiples of the Average True Range at the time of entry.
strategy "ATR stop and target"
    edition = 1
    display = price

setup:
    capital = 10000
    size = sizing.lots(0.1)

input length: int = 14, name = "ATR length", min = 2
input stop_mult: float = 2.0, name = "Stop multiple", min = 0.5, step = 0.5
input target_mult: float = 3.0, name = "Target multiple", min = 0.5, step = 0.5
let range = tech.atr(length)
let trend_up = tech.ema(close, 20) > tech.ema(close, 50)
if tech.crosses_above(close, tech.ema(close, 20)) and trend_up and trades.open_count == 0
    orders.enter("Long", side.long)
    orders.exit(
        "Long exit",
        "Long",
        stop = close - stop_mult * range,
        limit = close + target_mult * range,
    )
plot(tech.ema(close, 20), name = "EMA 20", color = color.orange)

// Rules that stop trading when a limit is reached: no more than two entries a day, no new entries after three losing days in a row.
strategy "Risk guards"
    edition = 1
    display = price

setup:
    capital = 10000
    size = sizing.lots(0.1)

input length: int = 20, name = "Length", min = 2
risk.max_daily_orders(2)
risk.max_losing_days(3)
let basis = tech.sma(close, length)
if tech.crosses_above(close, basis)
    orders.enter("Long", side.long)
if tech.crosses_below(close, basis)
    orders.close("Long")
plot(basis, name = "Basis", color = color.orange)