MetaStock Indicator - Gann High Low

Gann High Low
MetaStock Indicator

HLd:=If(CLOSE>Ref(Mov(H,3,S),-1),
{then}1,
{else}If(CLOSE<Ref(Mov(L,3,S),-1),
{then}-1,
{else}0));
HLv:=ValueWhen(1,HLd<>0,HLd);
HiLo:=If(HLv=-1,
{then}Mov(H,3,S),
{else}Mov(L,3,S));
HiLo;