有谁能看懂这段程序------vt 的

有哪位大侠能指点，不胜感激！！！

一个很好交易系统，想做一下修改，但看不懂程序不知道命令怎么用？




VT-Fractal Trading System

以下是程序：

{Up and Down Level Fractal}

F1:=ValueWhen(1,H<Ref(H,-2) AND Ref(H,-1)<Ref(H,-2) AND Ref(H,-3)<Ref(H,-2) AND Ref(H,-4)<Ref(H,-2),Ref(H,-2));

F2:=ValueWhen(1,L>Ref(L,-2) AND Ref(L,-1)>Ref(L,-2) AND Ref(L,-3)>Ref(L,-2) AND Ref(L,-4)>Ref(L,-2),Ref(L,-2));

{Cross Up and Down Level Fractal}

a:=Cross(H,F1);
b:=Cross(F2,L);

state:=BarsSince(a)<BarsSince(b);

{Signal Long and Short}

ShortSignal:= state < Ref(state,-1);
LongSignal:= state > Ref(state,-1);

{Trend Up and Down}

UpTrend:=state>0;
DownTrend:=state<1;

{OpenBuy and CloseBuy}

OpenBuy:=LongSignal and (eventCount('OpenBuy')= eventCount('CloseBuy'));
CloseBuy:= ShortSignal and (eventCount('OpenBuy')>eventCount('CloseBuy'));

{OpenSell and CloseSell}

OpenSell:=  ShortSignal and (eventCount('OpenSell')= eventCount('CloseSell'));
CloseSell:=  LongSignal and (eventCount('OpenSell')>eventCount('CloseSell'));

呵呵，不懂也来关税