MACD Three MA Lines Crossover System - Amibroker AFL Code

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_SECTION_BEGIN("macd HLCby3");

pivot = (H +L+C)/3; 
piv1 = EMA (pivot,Param("short ema",5,1,20,1));
piv2 = EMA (pivot,Param("med ema",12,1,20,1));
piv3 = EMA (pivot,Param("fast ema",34,1,50,1));

diff1 = piv2-piv3 ;
diff2 = piv1-piv2 ;
diff3 = piv1-piv3 ;

diff1_col = IIf (diff1 > Ref(diff1,-1),colorBlue,colorRed);
diff2_col = IIf (diff2 > Ref(diff2,-1),colorBlue,colorRed);
diff3_col = IIf (diff3 > Ref(diff3,-1),colorBlue,colorRed);


//Plot(diff1, "diff1", diff1_col, styleThick);
//Plot(diff2, "diff2", diff2_col, styleThick);
Plot (diff3, "diff3", diff3_col, styleThick);
Plot(0,"",colorGrey40);

Plot( BBandTop( diff3, 5, 0.5 ), "BBTop", colorYellow, styleDashed ); 
Plot( BBandBot( diff3, 5, 0.5 ), "BBBot", colorYellow, styleDashed ); 
_SECTION_END();