//@version=4
strategy(title="Prove it", shorttitle="DPO", format=format.price, precision=2)
period_ = input(350, title="Period", minval=1)
slow_ema = input(100, title="Short EMA", minval=1)
long_ema = input(125, title="Long EMA", minval=1)
barsback = period_/2 + 1
ma = sma(close, period_)
dpo = close - ma[barsback]
// plot(dpo, offset = 0, title="DPO", color=color.olive)
hline(0, title="Zero")


plot(ema(dpo, slow_ema), color=color.green)
plot(ema(dpo, long_ema), color=color.red)

ema1 = ema(dpo, slow_ema)
ema2 = ema(dpo, long_ema)

long = crossunder(ema2, ema1)
short = crossunder(ema1, ema2)

if long
    strategy.entry("Long", strategy.long, comment="Long")

if short
    strategy.entry("Short", strategy.short, comment="Short")