VT indicator change to MT4

Hello

This is the VT indicator, hoped that the master help me changes MT4

Thanks for any reply in advance...



HLd:=If(C>Ref(Mov(H,20,Simple),-1),1,If(C<Ref(Mov(L,20,Simple),-1),-1,0));
HLv:=ValueWhen(1,HLd<>0,HLd);
HiLo:=If(HLv=-1,Mov(H,20,Simple),Mov(L,20,Simple));


function explanation :
ref (DATA ARRAY,PERIOD)
References a previous or subsequent element in a DATA ARRAY. A positive PERIOD references "n" periods in the future; a negative PERIOD references "n" periods ago.


mov(DATA ARRAY,PERIODS,METHOD)
Calculates a PERIODS moving average of DATA ARRAY using METHOD calculation method.


ValueWhen(Nth,EXPRESSION, DATA ARRAY )
Returns the value of the DATA ARRAY when the EXPRESSION was true on the Nth most recent occurrence. This includes all data loaded in the chart.