Long Term Volatility Expert - Amibroker AFL Code

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//---- heikin ashi
HaClose = (O+H+L+C)/4; 
HaOpen = AMA( Ref( HaClose, -1 ), .40); 
HaHigh = Max( H, Max( HaClose, HaOpen ) ); 
HaLow = Min( L, Min( HaClose, HaOpen ) ); 
xDiff = (HaHigh - Halow) * IIf(StrFind(Name(),"JPY"),100,10000);
barcolor = IIf(HaClose >= HaOpen,colorGreen,colorRed);
PlotOHLC( HaOpen, HaHigh, HaLow, HaClose, "", barcolor, styleCandle ); 
// Plot(EMA(HaClose,9),"",colorWhite, styleLine);
// Plot(EMA(HaClose,18),"",colorBlack, styleLine);
_SECTION_BEGIN("KPL Swing");

no=Param( "Swing", 20, 1, 55 );
tsl_col=ParamColor( "Color", colorCycle );

res=HHV(H,no);
sup=LLV(L,no);
avd=IIf(C>Ref(res,-1),1,IIf(C<Ref(sup,-1),-1,0));
avn=ValueWhen(avd!=0,avd,1);
tsl=IIf(avn==1,sup,res);

Plot(tsl, _DEFAULT_NAME(), tsl_col, styleStaircase); // or styleaArea

Buy=Cross(C,tsl);
Sell=Cross(tsl,C);
shape=Buy*shapeUpArrow + Sell*shapeDownArrow;
PlotShapes(shape,IIf(Buy,tsl_col,tsl_col),0,IIf(Buy,Low,High));
_SECTION_END();