Canaux de Keltner

//@version=6
indicator("Keltner Channels", overlay=true)
length  = input.int(20,  "EMA Length")
atrMult = input.float(1.5, "ATR Multiplier")
atrLen  = input.int(10,  "ATR Length")
mid   = ta.ema(close, length)
upper = mid + atrMult * ta.atr(atrLen)
lower = mid - atrMult * ta.atr(atrLen)
longSignal  = ta.crossover(close, upper)
shortSignal = ta.crossunder(close, mid)
plotshape(longSignal,  style=shape.triangleup,   location=location.belowbar, color=color.green, size=size.small)
plotshape(shortSignal, style=shape.triangledown, location=location.abovebar, color=color.red,   size=size.small)
p1 = plot(upper, "Upper KC", color=color.new(color.purple, 0))
p2 = plot(lower, "Lower KC", color=color.new(color.purple, 0))
plot(mid, "Mid KC", color=color.orange)
fill(p1, p2, color=color.new(color.purple, 90))

input length = 20;
input atrMult = 1.5;
def mid = ExpAverage(close, length);
def atrVal = ATR(length);
def upper = mid + atrMult * atrVal;
def lower = mid - atrMult * atrVal;
def buySignal = close crosses above upper;
def sellSignal = close crosses below mid;
AddOrder(OrderType.BUY_AUTO, buySignal, close, 1, Color.GREEN, Color.GREEN, "Keltner Buy");
AddOrder(OrderType.SELL_AUTO, sellSignal, close, 1, Color.RED, Color.RED, "Keltner Exit");
plot Mid = mid;
Mid.SetDefaultColor(Color.CYAN);
plot Upper = upper;
Upper.SetDefaultColor(Color.GREEN);
plot Lower = lower;
Lower.SetDefaultColor(Color.RED);