Modified ATR Trailing Stoploss - Amibroker AFL Code

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_SECTION_BEGIN("Chaloke Modified ATR Trailing Stop");
 ///Chaloke Modified ATR Trailing Stop/// 

Prev=Ref(HHV(H-2.5*ATR(5),10),-BarsSince(C>HHV(H-2.5*ATR(5),10) AND C>Ref(C,-1))); 
A=IIf( Cum(1)<16 , C, 
IIf( C > HHV(H-2.5*ATR(5),10) AND C > Ref(C,-1),HHV(H-2.5*ATR(5),10), 
Prev)); 
Plot(A,"Chaloke Modified ATR Trailing Stop",colorBlack,4); 
Color=IIf(C>A,colorBrightGreen,IIf(C<A,colorRed,colorBlack)); 
Plot(C,"",color,styleCandle); 
PlotShapes(shapeDownArrow*Cross(A,C),colorBlue,0,H,Offset=-24); 
GraphXSpace=3;
_SECTION_END();