MA Based Trading Specialist - Amibroker AFL Code

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_SECTION_BEGIN("Background");
SetChartBkGradientFill(ParamColor("Top", colorTeal), ParamColor("Bottom", colorLightGrey), ParamColor("Title", colorTeal));
SetChartBkColor(ParamColor("Chart Background", colorWhite));
_SECTION_END();

_SECTION_BEGIN("Didi Index Indicator");
function DidiIndex( Curta, Media, Longa )
{
 global DidiLonga, DidiCurta;
 DidiLonga = MA( Close, Longa ) - MA( Close, Media );
 DidiCurta = MA( Close, Curta ) - MA( Close, Media );
 
 return IIf(DidiCurta > 0 AND DidiLonga < 0, 1,IIf(DidiCurta<0 AND DidiLonga>0, -1,0));
}

MAFast = Optimize("Curta",Param("MA Curta",3,1,5 ),1,5,1);
MAMid  = Optimize("Media",Param("MA Media",8,6,12),6,12,1);
MASlow = Optimize("Longa",Param("MA Longa",20,15,34),15,34,1);

Trend = DidiIndex(MAFast, MAMid, MASlow);
Buy = Cross(Trend,0) AND ADX()>MDI();
Sell = Cross(0,Trend);
Buy = ExRem(Buy,Sell); Sell = ExRem(Sell,Buy);

TrendColor = IIf(DidiCurta>0,colorLime,colorRed);

Plot( DidiCurta, _DEFAULT_NAME(), TrendColor, ParamStyle("Histogram style", styleThick | styleHistogram | styleNoLabel, maskHistogram ));
Plot(0,"", colorBrown ,styleLine);

Plot(DidiLonga,"",IIf(DidiLonga<0,colorGreen,colorRed),styleLine | styleThick);

Plot(DidiCurta,"",IIf(DidiCurta>0,colorGreen,colorRed),styleLine | styleThick);

//Normal Buy and Sell Signal
PlotShapes(Buy*shapeUpTriangle,colorBlue,0,-0.5);
PlotShapes(Sell*shapeDownTriangle,colorPink,0,0.5);

// The Best Signal: Didi Needleful
PlotShapes((Cross(DidiCurta,0) AND Cross(0,DidiLonga)) * shapeHollowCircle, colorYellow,0,0.25);
_SECTION_END();