{Swing Direction}
Sd:= FmlVar("GANN-Swing","TD1") ;
{Swing Change High}
Sch:=If(Sd=1 AND Ref(sd,-1)=-1,
{then}1,
{else}0);
{Swing Change Low}
Scl:=If(Sd=-1 AND Ref(Sd,-1)=1,
{then}1,
{else}0);
{Peak Value}
Pv:=If(Scl=1,
{then}HighestSince(1,Sch=1,H),
{else}0);
{Trough Value}
Tv:=If(Sch=1,
{then}LowestSince(1,Scl=1,L),
{else}0);
{Trend Direction}

Td:=If(H>ValueWhen(1,Pv>0,Pv),
{then}1,
{else}If(L<ValueWhen(1,Tv>0,Tv),
{then}-1,
{else}0));
{UpTrend=1 DownTrend =-1}
Tdv:=ValueWhen(1,Td<>0,Td);
Tdv;