STEP1:=1/100;
MVALUE1:=20/100;
SARLINE:SAR(3,STEP1,MVALUE1),CIRCLEDOT,NODRAW;//N个周期的抛物转向，步长为STEP1，极限值为MVALUE1.
IF(SARLINE>0,SARLINE,NULL),COLORRED,CIRCLEDOT;
IF(SARLINE<0,ABS(SARLINE),NULL),COLORCYAN,CIRCLEDOT;
BU:=CROSS(HIGH,ABS(SARLINE));
SEL:=CROSS(ABS(SARLINE),LOW);
DRAWTEXT(BU,LOW,'B'),COLORYELLOW,LINETHICK2;
DRAWTEXT(SEL,*HIGH,'S'),COLORGREEN,LINETHICK2;
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