用房子线指标写一个预警公式

麻烦老师做一个出现红色买入箭头时的选股公式
DIF1:=EMA(DCLOSE,12)-EMA(DCLOSE,26);
DEA1:=EMA(DIF1,9);
{柱状线}
AAA1:=(DIF1-DEA1)*2*60;
AAA上:IF(AAA1>REF(AAA1,1),AAA1,DRAWNULL),
STICK,COLORRED,LINETHICK1;
AAA下:IF(AAA1<REF(AAA1,1),AAA1,DRAWNULL),STICK,COLORYELLOW,LINETHICK1;
买入线:7;
房子:AAA1-REF(AAA1,1),COLORRED;
DRAWICON(crOSS(房子,买入线),买入线,1);