求通達信變色均線的代碼？當均線開始上翹變彩色，當均線開始下拐變綠色！

VAR2:MA(C,21),COLORRED,LINETHICK4;

上翹:IF(VAR2>REF(VAR2,1),VAR2,DRAWNULL),COLORRED,LINETHICK4;

下拐:IF(VAR2<REF(VAR2,1),VAR2,DRAWNULL),COLOR227700,LINETHICK4;