{布林线收口变窄擒牛指标公式}
MTR:=MAX(MAX((H-L),ABS(REF(C,1)-H)),ABS(REF(C,1)-L));{真实波幅}
ATR:=MA(MTR,14);{平均真实波幅}
BOLL:MA(C,20);{布林线中轨}
UB:BOLL+2*STD(C,20);{布林线上轨}
LB:BOLL-2*STD(C,20);{布林线下轨}
HH:=HHV(H,30);{30日最高价}
LL:=LLV(L,30);{30日最低价}
LC:=(C-LL)/(HH-LL)<0.4;{收盘价在30日低位}
SK:=UB-BOLL<ATR;{上轨与中轨的距离小于ATR，表现为布林线收口}
KX:=C/REF(C,1)>1.01 AND C>MA(C,10) AND VOL>MA(VOL,5);{涨幅大于1%，收盘价大于10日均线，成交量大于5日均量}
A1:=KX AND LC AND BARSLAST(SK)<5;{满足KX条件，收盘价在低位，距离上次布林线收口小于5个周期}
DRAWICON(A1,L,1);{满足A1画红箭头}
STICKLINE(A1,H,L,0,0),COLORYELLOW;{满足A1画黄色K线}
STICKLINE(A1,O,C,3,0),COLORYELLOW;{满足A1画黄色K线};