文档介绍：N:=7;A1:=REF(H,N)=HHV(H,2*N+1);B1:=FILTER(A1,N);C1:=BACKSET(B1,N+1);D1:=FILTER(C1,N);A2:=REF(L,N)=LLV(L,2*N+1);B2:=FILTER(A2,N);C2:=BACKSET(B2,N+1);D2:=FILTER(C2,N);E1:=(REF(LLV(L,2*N),1)+REF(HHV(H,2*N),1))/2;E2:=(H+L)/2;H1:=(D1ANDNOT(D2ANDE1>=E2));L1:=(D2ANDNOT(D1ANDE1<E2));H2:=D1ANDNOT(D2ANDE1>=E2);X1:=REF(BARSLAST(H1),1)+1;F1:=BACKSET(H1ANDCOUNT(L1,X1)>0,LLVBARS(IF(L1,L,1000000),X1)+1);G1:=F1>REF(F1,1);I1:=BACKSET(G1,1);LD:=I1>REF(I1,1);L2:=LDORISLASTBARORBARSCOUNT(C)=1;X2:=REF(BARSLAST(L2),1)+1;F2:=BACKSET(L2ANDCOUNT(H2,X2)>0,HHVBARS(IF(H2,H,0),X2)+1);G2:=F2>REF(F2,1);I2:=BACKSET(G2,1);HD:=I2>REF(I2,1);R1:=BACKSET(ISLASTBAR,BARSLAST(HD)+1);S1:=R1>REF(R1,1);T1:=BACKSET(ISLASTBAR,BARSLAST(LD)+1);U1:=T1>REF(T1,1);R2:=BACKSET(S1,SUMBARS(HD,2));S2:=R2>REF(R2,1);T2:=BACKSET(U1,SUMBARS(LD,2));U2:=T2>REF(T2,1);DRAWLINE1(S2,H,S1,H,1),HICK2,COLORRED;DRAWLINE1(U2,L,U1,L,1),HICK2,REEN;