箱体上轨画线公式

N:=10 ;
 A1:=ref(h,N)=hhv(h,2*N+1);
 B1:=filter(A1,N+1);
 C1:=backset(B1,N+1);
 D1:=filter(C1,n+1);{高点}
A2:=ref(l,N)=llv(l,2*N+1);
 B2:=filter(A2,N+1);
 C2:=backset(B2,N+1);
 D2:=filter(C2,N+1);{低点}
E1:=(ref(llv(l,2*N+1),1)+ref(hhv(h,2*N+1),1))/2;
 E2:=(h+l)/2;{高低点出现在同一K线上时可作取舍}
H1:=(D1 AND not(D2 AND E1>=E2)) OR barstatus=2 OR barscount(c)=1;
 L1:=(D2 AND not(D1 AND E1<E2)); 
 H2:=D1 AND not(D2 AND E1>=E2);
 X1:=ref(barslast(H1),1)+1;
 F1:=backset(H1 AND count(L1,X1)>0,llvbars(if(L1,l,10000),X1));
 G1:=F1>ref(F1,1);
 I1:=backset(G1,2);
 LD:=I1>ref(I1,1);{过滤后低点}
L2:=LD OR barstatus=2 OR barscount(c)=1;
 X2:=ref(barslast(L2),1)+1;
 F2:=backset(L2 AND count(H2,X2)>0,hhvbars(if(H2,h,0),X2));
 G2:=F2>ref(F2,1); I2:=backset(G2,2); HD:=I2>ref(I2,1);{过滤后高点}
R1:=backset(barstatus=2,barslast(HD)+1);
 S1:=R1>ref(R1,1); {前一高}
T1:=backset(barstatus=2,barslast(LD)+1);
 U1:=T1>ref(T1,1); {前一低}
R2:=backset(S1,ref(barslast(HD),1)+2);
 S2:=R2>ref(R2,1); {前二高}
T2:=backset(U1,ref(barslast(LD),1)+2);
 U2:=T2>ref(T2,1); {前二低}

短期压力:drawline(S2,h,S1,h,1),Colorred;
短期支撑:drawline(U2,l,U1,l,1),Colorgreen;

 HH1:=if(s2,H,ref(H,BARSLAST(s2)));
 HH2:=if(s1,H,ref(H,BARSLAST(s1)));
 LL1:=if(u2,l,ref(l,BARSLAST(u2)));
 LL2:=if(u1,l,ref(l,BARSLAST(u1)));

上线:HH1+(HH2-HH1)*BARSLAST(s2)/(BARSLAST(s2)-BARSLAST(s1));
下线:LL1+(LL2-LL1)*BARSLAST(U2)/(BARSLAST(U2)-BARSLAST(u1));

通达信指标源码：
QA:=REF(H,10)=HHV(H,2*10+1);
 QB:=BACKSET(QA,10+1);
 QC:=FILTER(QB,10) AND H=HHV(H,10+1);
 QD:=BARSLAST(QC);
 QE:=IF(QC,CURRBARSCOUNT,0);
 QF:=IF(QD,REF(QE,QD),QE);
 QG:=CONST(QF);
 QH:=REF(QF,QD+1);
 QW:=CONST(QH);

 QM:=INTPART(3*8/5);
 QR:=REF(H,QM)=HHV(H,2*QM+1);
 QT:=FILTER(QR,QM);
 QY:=BACKSET(QT,QM+1);
 QU:=FILTER(QY,QM);
 QI:=BACKSET(ISLASTBAR,BARSLAST(QU)+1);
 QP:=QI>REF(QI,1);
 DRAWLINE(QU,H,QP,H,1),COLORRED;