Swing Trading System for Amibroker (AFL)

/*
 * Downloaded From www.investallig.com
 * Please do not remove this comment when pasting code on another site. Thank you.
*/
_SECTION_BEGIN("");
SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));
Plot( C, "Close", ParamColor("Color", colorBlack ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() ); 
_SECTION_END();

_SECTION_BEGIN("Swing Trading System");

InitStop = 20; //11; 
TRStop = EMA(Close,30);// 84; 

Buy = Cross( EMA( Close, 10 ), EMA( Close, 20 )) AND EMA(Close,10) > EMA(Close,20) AND EMA(Close,20) AND EMA(Close,30)-1;
Sell = Cross( EMA( Close, 30 ), EMA( Close, 20 )) AND EMA(Close,30) > EMA(Close,20) AND EMA(Close,10) AND EMA(Close,20)-1;
Short = Sell; 
Cover=Buy; 

BuyPrice		= ValueWhen(Buy, High);
ShortPrice		= ValueWhen(Short, Low);
CoverPrice		= ValueWhen(Cover, Close);
SellPrice		= ValueWhen(Sell, Close);


dist = 1.5*ATR(10); 

for( i = 0; i < BarCount; i++ ) 
{ 
if( Buy[i] ) PlotText( "Buy: > " + H[ i ], i, L[ i ] - dist[i], colorBrightGreen); // alteration - C instead of H/L 
if( Sell[i] ) PlotText( "Sell: < " + L[ i ], i, H[ i ] + dist[i], colorOrange); 
} 

PlotShapes(IIf(Sell==1, shapeDownArrow, shapeNone), colorRed, 0,High, Offset=-15);
PlotShapes(IIf(Buy==1, shapeUpArrow , shapeNone), colorGreen, 0,Low, Offset=-15);

Plot( EMA( Close,10),"MA10",colorRed,styleLine);
Plot( EMA( Close,20),"MA20",colorBlue,styleLine);
Plot( EMA( Close,30),"MA30",colorGreen,styleLine);

ApplyStop(stopTypeTrailing, stopModePoint, TRStop, 0, False, 0);
ApplyStop(stopTypeLoss, stopModePoint, InitStop, 0, False, 0);


_SECTION_END();

//Settings for Backtesting to keep lot size fixed // Need help here
SetOption("MaxOpenPositions",1);
RoundLotSize = 125;
SetOption("MinShares",RoundLotSize);
PositionSize = C*125*2;
//End of Backtesting Settings for Backtester