How to Define this function

Hoummad Elkraima 2022.12.29 18:05

// Input parameters
input int   Period = 14;        // Number of bars to consider
input int   Range  = 20;        // Range of the volume profile in points
input double   SetChartWindow = 0; 


// Global variables
double      VolumeProfile[];    // Array to store volume profile values

// Calculate the volume profile for the given period and range
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
{
    // Check if the period is valid
    if (Period < 1 || Period > rates_total)
        return -1;

    // Initialize the volume profile array
    ArraySetAsSeries(VolumeProfile, false);
    ArrayResize(VolumeProfile, Range * 2 + 1);

    // Calculate the volume profile
    for (int i = 0; i < Range * 2 + 1; i++)
    {
        double volumeSum = 0;
        for (int j = 0; j < Period; j++)
        {
            if (low[j] <= (i - Range) && high[j] >= (i - Range))
                volumeSum += volume[j];
        }
        VolumeProfile[i] = volumeSum;
    }

    // Return the number of bars calculated
    return Period;
}

// Plot the volume profile on the chart
void OnDraw()
{
    // Set the chart window and draw the volume profile
    
     
      SetChartWindow(0);
    for (int i = 0; i < Range * 2 + 1; i++)
         Plot(VolumeProfile[i], "Volume Profile", DeepSkyBlue, STYLE_SOLID, 0, i - Range);
}