求教 tick里当卖一挂单量大于买一挂单量时，上面卖一就划红线，下面买一就不画线，反之 (文华财经WH6赢顺V6.7)

 参考：

DRAWSL1(ASK1VOL>BID1VOL,ASK1,0,1,0),COLORRED;
DRAWSL1(ASK1VOL<BID1VOL,BID1,0,1,0),COLORGREEN;