Modified 3 Ways EMA Crossover System - Amibroker AFL Code

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_SECTION_BEGIN("Price");
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("ema");

fast = Optimize("fast ema", 3,2,15,1);
med = Optimize("med ema", 30,5,35,1);
Long = Optimize("long ema", 43,15,89,1);

Plot( MA( Close, fast ),"fast ema", colorYellow, styleThick ); 
Plot( EMA( Close, med ),"med ema", colorRed, styleThick ); 
Plot( EMA( Close, Long ),"long ema", colorBlue, styleThick ); 

Buy = Cross (MA( Close, fast ), EMA( Close, Long )) OR Cross (MA( Close, fast ), EMA( Close, med )) ;
Short=Cross (EMA( Close, Long ), MA( Close, fast )) OR Cross (EMA( Close, med ), MA( Close, fast ));
Sell = Cross (MA( Close, med ), EMA( Close, fast ));
Cover = Cross (MA( Close, fast ), EMA( Close, med ));
 
PlotShapes (Buy*shapeUpTriangle,colorGreen);
PlotShapes (Short*shapeDownTriangle,colorRed);