here is the code for the abvoe AFL
_SECTION_BEGIN("MACD");
SetChartBkColor( ParamColor("background",colorBlack) );
A1=EMA(C,12)-EMA(C,26);
BBtop=BBandTop(A1,10,1);
BBbot=BBandBot(A1,10,1);
Color=IIf(a1<0 AND a1>Ref(a1,-1), colorLime,IIf(a1>0 AND a1>Ref(a1,-1),colorBrightGreen,IIf(a1>0 AND a1<Ref(a1,-1),colorCustom12,colorRed)));
Plot(a1,"MACD",color,styleDots+styleLine);
Plot(BBtop,"BBtop",colorGreen,styleDashed);
Plot(BBbot,"BBbot",colorRed,styleDashed);
Plot(0,"",31,1);
_SECTION_END();
vidyasagar