通达信TRUE TREND（源码主图贴图）

DRAWKLINE(H,O,L,C);
 T1:=C/REF(C,3);
 T2:=C/REF(C,4);
 T3:=C/REF(C,5);
 T4:=C/REF(C,6);
 T5:=C/REF(C,7);
 T6:=C/REF(C,8);
 T7:=C/REF(C,9);
 T8:=C/REF(C,10);
 T9:=C/REF(C,11);
 T10:=C/REF(C,12);
 T11:=C/REF(C,13);
 B1:=MAX(MAX(T1,T2),MAX(T3,T4));
 B2:=MAX(MAX(T5,T6),MAX(T7,T8));
 B3:=MAX(T9,T10);
 UP0:=MAX(MAX(B1,B2),B3);

B4:=MIN(MIN(T1,T2),MIN(T3,T4));
 B5:=MIN(MIN(T5,T6),MIN(T7,T8));
 B6:=MIN(T9,T10);
 DN0:=MIN(MIN(B4,B5),B6);

UP:UP0*(C+O+L+H)/4.17;
 DN:DN0*(C+O+L+H)/4.17;