参考：
N:=8;
AA:=REF(H,N)=HHV(H,2*N+1);
AA1:=REF(L,N)=LLV(L,2*N+1);
QY:=BACKSET(AA,N+1);
QY1:=BACKSET(AA1,N+1);
CC:=FILTER(QY,N) AND H=HHV(H,N+1);
CC1:=FILTER(QY1,N) AND L=LLV(L,N+1);
DRAWTEXT(CC1,L,'多');
DRAWTEXT(CC,H,'空');
DDD:=BARSLAST(CC);
DD1:=BARSLAST(CC1);
GDTS:=IF(CC,DATACOUNT-BARPOS,0);
DDTS:=IF(CC1,DATACOUNT-BARPOS,0);
DINGBUTS:=IF(DDD,REF(GDTS,DDD),GDTS);
DDTS1:=IF(DD1,REF(DDTS,DD1),DDTS);
GDCS1:=DINGBUTS;
DDCS1:=DDTS1;
GDCS13:=REF(HIGH,GDCS1-1);
DDCS13:=REF(L,DDCS1-1);
DINGBUTS1:=REF(DINGBUTS,DDD+1);
DDTS2:=REF(DDTS1,DD1+1);
GDCS2:=DINGBUTS1;
DDCS2:=DDTS2;
GDCS23:=REF(HIGH,DINGBUTS1-1);
DDCS23:=REF(L,DDTS2-1);
DRAWSL1(ISLASTBAR,GDCS13,0,DDD,1),COLORRED;
DRAWSL1(ISLASTBAR,DDCS13,0,DD1,1),COLORGREEN;
DRAWSL1(ISLASTBAR,GDCS23,0,DINGBUTS1-1,1),COLORFF8080;
DRAWSL1(ISLASTBAR,DDCS23,0,DDTS2-1,1),COLORFFFF00;
DRAWNUMBER1(ISLASTBAR,GDCS13,GDCS13,0),COLORRED,ALIGN0;
DRAWNUMBER1(ISLASTBAR,DDCS13,DDCS13,0),COLORGREEN,ALIGN0;
DRAWNUMBER1(ISLASTBAR,GDCS23,GDCS23,0),COLORFF8080,ALIGN0;
DRAWNUMBER1(ISLASTBAR,DDCS23,DDCS23,0),COLORFFFF00,ALIGN0;
有未来函数BACKSET
在指标公式编辑器》插入函数，可以看到未来函数的分类，您可以学习一下
