MA EMA Average Price Crossover System - Amibroker AFL Code

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_SECTION_BEGIN("Lagless_MA");
prd=Param("Periods",21,1,250,1);
x=2*EMA(C,prd)-EMA(EMA(C,prd),prd);
Plot(x,"Lagless MA",colorWhite,styleThick,1);
Plot(Close, "Close", colorYellow , styleThick);
Buy=Cover= Cross(C,X);
Sell=Short=Cross(X,C);
PlotShapes( shapeUpArrow* Buy, colorDarkGreen, 0, L,-5 );
PlotShapes( shapeDownArrow* Sell, colorDarkRed, 0, H,-5 );