Displaying Good Volatility Pastie For Amibroker (AFL)

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_SECTION_BEGIN("Volatility 2");
// Just Re-share
// E.M.Pottasch, Jul 2010
// from Metastock formula, link: http://stocata.org/metastock/stop_trail_atr.html
// added separate parameters for upward and downward market environment
 
function vstop_func(trBull,trBear)
{
    trailArray[ 0 ] = C[ 0 ]; // initialize
    for( i = 1; i < BarCount; i++ )
    {
        prev = trailArray[ i - 1 ];
  
        if (C[ i ] > prev AND C[ i - 1 ] > prev)
        {
            trailArray[ i ] = Max(prev,C[ i ] - trBull[ i ]);
        }
        else if (C[ i ] < prev AND C[ i - 1 ] < prev)
        {
            trailArray[ i ] = Min(prev,C[ i ] + trBear[ i ]);
        }
        else if (C[ i ] > prev)
        {
            trailArray[ i ] = C[ i ] - trBull[ i ];
        }
        else
        {
            trailArray[ i ] = C[ i ] + trBear[ i ]; 
        }
    }
    return trailArray;
}
 
per = Param("per",20, 1, 150, 1);
multBull = Param("multBull",2, 1, 4, 0.05);
multBear = Param("multBear",2, 1, 4, 0.05);
 
trBull = multBull * ATR(per);
trBear = multBear * ATR(per);
 
trailArray = vstop_func(trBull,trBear);
 
SetChartBkColor( ParamColor("ColorBG", ColorRGB( 0, 0, 0 ) ) );
GraphXSpace = 5;
SetChartOptions(0, chartShowDates);
Plot(IIf(trailArray > C,trailArray,Null),"\ntrailShort",ParamColor("ColorTrailShort",ColorRGB(255,0,0)),styleStaircase);
Plot(IIf(trailArray < C,trailArray,Null),"\ntrailLong",ParamColor("ColorTrailLong",ColorRGB(0,255,0)),styleStaircase);
Plot( C, "\nCandle",colorWhite, styleCandle );
_SECTION_END();

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Good Volatility for Amibroker (AFL)