编写-BOLL 显示箭头 (文华财经)

 参考：

MID:MA(CLOSE,26);
TMP2:=STD(CLOSE,26);
TOP:MID+2*TMP2;
BOTTOM:MID-2*TMP2;

JC:=CROSS(C,MID);
SC:=CROSSDOWN(C,MID);

DRAWICON(JC,L,4),VALIGN0;
DRAWICON(SC,H,5),VALIGN2;