策略：
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由最高價和最低價的之字轉向，確定高低點連線
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源碼：
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ZH:=ZIGZAG(HIGH,100,0);
ZL:=ZIGZAG(LOW,100,0);
CONH:=ZH>REF(ZH,1)&&ZH>REFX(ZH,1);
CONL:=ZL<REF(ZL,1)&&ZL<REFX(ZL,1);
N:=BARSLAST(CONL)+1;
M:=BARSLAST(CONH)+1;//www.weiqiv.net.cn
LX:=BACKSET(M=1&&REF(EXIST(N=1,M),1),REF(LLVBARS(LOW,M),1)+2);
HX:=BACKSET(N=1&&REF(EXIST(M=1,N),1),REF(HHVBARS(HIGH,N),1)+2);
DRAWLINE1(CROSS(LX=1,0.5),L,CROSS(HX=1,0.5),H,0),LINETHICK3,COLORRED;
DRAWLINE1(CROSS(HX=1,0.5),H,CROSS(LX=1,0.5),L,0),LINETHICK3,COLORGREEN;
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