MACD Strategy With Histogram drew102

//@version=3
strategy("MACD", calc_on_order_fills=true, currency=currency.USD, default_qty_type=strategy.percent_of_equity, default_qty_value=100, commission_value=0.0675)

// Getting inputs
fastLength = input(title="Fast Length", type=integer, defval=12)
slowlength = input(title="Slow Length", type=integer, defval=26)
signalLength = input(title="Signal Smoothing", type=integer, minval = 1, maxval = 50, defval = 9)

// Calculating
macd = ema(close, fastLength) - ema(close, slowlength)
signal = ema(macd, signalLength)
delta = macd - signal

// Plot colors
col_grow_above = #26A69A
col_grow_below = #FFCDD2
col_fall_above = #B2DFDB
col_fall_below = #EF5350
col_macd = #0094ff
col_signal = #ff6a00

// Plot histogram
plot(delta, title="Histogram", style=columns, color=(delta>=0 ? (delta[1] < delta ? col_grow_above : col_fall_above) : (delta[1] < delta ? col_grow_below : col_fall_below) ), transp=0 )
plot(macd, title="MACD", color=col_macd, transp=0)
plot(signal, title="Signal", color=col_signal, transp=0)

// Plot orders
if (crossover(delta, 0))
    strategy.entry("buy", strategy.long)
if (crossunder(delta, 0))
    strategy.entry("sell", strategy.short)