Perfect Swing Trading Master System - Amibroker AFL Code

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_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();