MACD EMA Filter Strategy

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © Salih Emin (cerebrux)

//@version=5
strategy("MACD EMA filter strategy", shorttitle= "MACD / EMA filter", overlay=false)

// Variables that you can optimize based on the timeframe or underlining asset

fastLength = input(12)
slowlength = input(26)
MACDLength = input(9)
EMA = input(200)

// Calculation of MACD Components

MACD = ta.ema(close, fastLength) - ta.ema(close, slowlength)
signal = ta.ema(MACD, MACDLength)
deltaHistogram = MACD-signal

// ================ Strategy =============================================== 

// If there is a crossover of signal and MACD line and the price closed above the EMA, enter a long position
// Exit when a crossunder of signal and MACD line happens
if (ta.crossover(deltaHistogram, 0)) and close>ta.ema(close, EMA)
    strategy.entry("long",strategy.long, comment="Enter Long")
if (ta.crossunder(deltaHistogram, 0))
    strategy.close("long", comment="Exit Long")

// If there is a crossunder of signal and MACD line and the price closed bleow the EMA, enter a short position
// Exit when a crossover of signal and MACD line happens
if (ta.crossunder(deltaHistogram, 0)) and close<ta.ema(close, EMA)
    strategy.entry("short",strategy.short, comment="Enter Short")
if (ta.crossover(deltaHistogram, 0))
    strategy.close("short", comment="Exit Short")
//===========================================================================
// Display the MACD indicator components

plot(deltaHistogram,title="MACD histogram",style=plot.style_histogram,color=color.blue)
plot(MACD, title="MACD line",color=color.green)
plot(signal,title="signal line",color=color.red)