This ProBuilder script is designed to generate visual trading signals on a chart by identifying crossovers between two moving averages (MA) with customizable settings. The settings allow for different types of moving averages and adjustments to the calculation method and shift.

FastMA=5
FastMAshift=0
FastMAMethod=2 //0 = SMA, 1 = EMA, 2 = WMA, 3 = Wilder, 4 = Triangular, 5 = End point, 6 = Time series, 7 = Hull (PRT v11 only), 8 = ZeroLag (PRT v11 only)
SlowMA=13
SlowMAshift=0
SlowMAMethod=2
iprice = customclose
atr = AverageTrueRange[20](close)/2
fast = average[FastMA,FastMaMethod](iprice)[FastMAShift]
slow = average[SlowMA,SlowMaMethod](iprice)[SlowMAShift]
if fast crosses over slow then
    drawarrowup(barindex,low-atr) coloured(0,255,255)
elsif fast crosses under slow then
    drawarrowdown(barindex,high+atr) coloured(255,0,0)
endif
return

This script is structured to facilitate the visualization of moving average crossovers, which are common trading signals. Below is a step-by-step explanation of the code:

• Initialization of Variables: The script starts by defining the parameters for two moving averages – a fast and a slow MA. These include the period (FastMA, SlowMA), the shift (FastMAshift, SlowMAshift), and the method of calculation (FastMAMethod, SlowMAMethod).
• Price and ATR Calculation: The price variable is set to customclose, which could be a user-defined closing price. The atr variable calculates the Average True Range (ATR) of the last 20 bars divided by 2, providing a dynamic offset for the signal arrows based on market volatility.
• Calculation of Moving Averages: The fast and slow variables compute the moving averages using the previously defined settings. The average function is used with the specified period, method, and shift.
• Conditional Statements for Crossover Detection: The script checks for crossover events. If the fast MA crosses over the slow MA, an upward arrow is drawn below the bar. Conversely, if the fast MA crosses under the slow MA, a downward arrow is drawn above the bar. The arrows are colored cyan for upward and red for downward movements.

This indicator is useful for traders who rely on moving average crossovers to make decisions, providing clear visual cues directly on the trading chart.