以下是通达信自动划线源码
A1:=REF(HIGH,3)=HHV(HIGH,2*3+1);
B1:=FILTER(A1,3);
C1:=BACKSET(B1,3+1);
D1:=FILTER(C1,3);{高点}
A2:=REF(LOW,3)=LLV(LOW,2*3+1);
B2:=FILTER(A2,3);
C2:=BACKSET(B2,3+1);
D2:=FILTER(C2,3);{低点}
E1:=(REF(LLV(LOW,2*3),1)+REF(HHV(HIGH,2*3),1))/2;
E2:=(HIGH+LOW)/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 ISLASTBAR OR BARSCOUNT(CLOSE)=1;
H2:=D1 AND NOT(D2 AND E1>=E2);
L1:=D2 AND NOT(D1 AND E1=E2);
X1:=REF(BARSLAST(H1),1)+1;
F1:=BACKSET(H1 AND COUNT(L1,X1)>0,LLVBARS(IF(L1,LOW,10000),X1));
G1:=F1>REF(F1,1);
I1:=BACKSET(G1,2);
LD:=I1>REF(I1,1);{过滤后低点}
L2:=LD OR ISLASTBAR OR BARSCOUNT(CLOSE)=1;
X2:=REF(BARSLAST(L2),1)+1;
F2:=BACKSET(L2 AND COUNT(H2,X2)>0,HHVBARS(IF(H2,HIGH,0),X2));
G2:=F2>REF(F2,1);
I2:=BACKSET(G2,2);
HD:=I2>REF(I2,1);{过滤后高点}
J1:=BACKSET(ISLASTBAR,MIN(BARSLAST(HD),BARSLAST(LD))+1);
J2:=J1>REF(J1,1);
A3:=H; B3:=REF(H,REF(BARSLAST(HD),1)+1)>REF(H,REF(BARSLAST(HD),1)+2+REF(BARSLAST(HD),REF(BARSLAST(HD),1)+2));
D3:=A3 AND B3 AND HD;
E3:=BACKSET(D3,REF(BARSLAST(HD),1)+2);
HH:=E3>REF(E3,1);{找出全部长期高点}
A4:=L>REF(L,REF(BARSLAST(LD),1)+1);
B4:=REF(L,REF(BARSLAST(LD),1)+1); D4:=A4 AND B4 AND LD; E4:=BACKSET(D4,REF(BARSLAST(LD),1)+2); LL:=E4>REF(E4,1);{找出全部长期低点}
DRAWICON(HH,H*1.01,8);
DRAWICON(LL,L*0.999,7);
H3:=HH OR ISLASTBAR OR BARSCOUNT(C)=1; {后面进行过滤，方法同前。只是不用考虑高低点出现在同一K线}
X3:=REF(BARSLAST(H3),1)+1;
F3:=BACKSET(H3 AND COUNT(LL,X3)>0,LLVBARS(IF(LL,L,POW(10,20)),X3));
G3:=F3>REF(F3,1);
I3:=BACKSET(G3,2);
LZ:=I3>REF(I3,1); {长期低点，也可供引用}
L4:=LZ OR ISLASTBAR OR BARSCOUNT(C)=1;
X4:=REF(BARSLAST(L4),1)+1;
F4:=BACKSET(L4 AND COUNT(HH,X4)>0,HHVBARS(IF(HH,H,-POW(10,20)),X4));
G4:=F4>REF(F4,1);
I4:=BACKSET(G4,2);
HZ:=I4>REF(I4,1);{长期高点，也可供引用}
K1:=BACKSET(ISLASTBAR,MIN(BARSLAST(HZ),BARSLAST(LZ))+1);
K2:=K1>REF(K1,1);
UU:=BACKSET(ISLASTBAR,BARSLAST(LD)+1);
VV:=UU>REF(UU,1);
WW:=BACKSET(VV,REF(BARSLAST(LD),1)+2);
XX:=WW>REF(WW,1);
UU2:=BACKSET(ISLASTBAR,BARSLAST(HD)+1);
VV2:=UU2>REF(UU2,1);
WW2:=BACKSET(VV2,REF(BARSLAST(HD),1)+2);
XX2:=WW2>REF(WW2,1);
前一低:REF(L,BARSLAST(VV)),COLOR99FF66,LINETHICK1;
前二低:REF(L,BARSLAST(XX)),COLOR99FF66,LINETHICK1;
前一高:REF(H,BARSLAST(VV2)),COLORCYAN,LINETHICK1;
前二高:REF(H,BARSLAST(XX2)),COLORCYAN,LINETHICK1;
DRAWLINE(XX,L,VV,L,1),COLORMAGENTA,LINETHICK1;
DRAWLINE(XX2,H,VV2,H,1),COLORMAGENTA,LINETHICK1;
DRAWTEXT(CURRBARSCOUNT=5,前一低*0.995,'前一低'),COLOR99FF66;
DRAWTEXT(CURRBARSCOUNT=5,前二低*0.995,'前二低'),COLOR99FF66;
DRAWTEXT(CURRBARSCOUNT=1,前一高*1.01,'前一高'),COLORCYAN;
DRAWTEXT(CURRBARSCOUNT=1,前二高*1.01,'前二高'),COLORCYAN;
涨家数:INDEXADV,COLOR0080FF,NODRAW;
跌家数:INDEXDEC,COLORGREEN,NODRAW;
