//@version=4
study("My Script", overlay=true)

ema1=ema(close, 100)
plot(ema1)

ema2=ema(close, 50)
plot(ema2, color=color.red)

enter=crossover(close, ema1)
plotshape(enter, style=shape.triangleup,size=size.small, color=color.lime, location=location.belowbar, text="enter")

exit=crossover(ema2, ema1)
plotshape(exit, style=shape.diamond,size=size.small, color=color.yellow, location=location.abovebar, text="exit")


aaa=barssince(enter)
plot(aaa)

bbb=barssince(exit)
plot(bbb)

long=aaa>bbb

qqq=valuewhen(long,close,0)
col=qqq==qqq[1]?color.yellow:na
plot(qqq, color=col)