就是从近期的最低点的K线计算，不跌破此K线的最低价可持有、跌破卖出；有效突破此K线的最高价即可买入。

{股市红绿灯主图}

N:=20;

CC:=ZIG(3,N);

GT1:PEAKBARS(1,N,1),NODRAW;

DT1:=TROUGHBARS(2,N,1);

H1:DRAWLINE(CURRBARSCOUNT=CONST(GT1)+1,H,ISLASTBAR,REF(H,CONST(GT1)),0),DOTLINE,LINETHICK1,COLORWHITE;

L1:DRAWLINE(CURRBARSCOUNT=CONST(DT1)+1,L,ISLASTBAR,REF(L,CONST(DT1)),0),DOTLINE,LINETHICK1,COLORCYAN;

HX0:=IF(H/L>1.04 AND V>=HHV(V,BARSLAST(CURRBARSCOUNT=CONST(GT1)+1)+1) AND LLV(L,N)=L,L,99);

HXW:=CONST(LLV(L1,N))=L AND NOT(ISLASTBAR);

BW:=CURRBARSCOUNT=CONST(BARSLAST(HXW))+1;

YZX:REF(H,BARSLAST(BW))DOTLINE,COLORGREEN;

YZA:REF(L,BARSLAST(BW))DOTLINE,COLORYELLOW;

YZU:REF((H+L)/2,BARSLAST(BW))DOTLINE,COLORRED;

DRAWTEXT(BW,L*0.97,VAR2STR(L,2));

DRAWTEXT(ISLASTBAR,H1,'近期高点')COLORWHITE;

DRAWTEXT(HXW,L+0.151,'近期低点'),COLORYELLOW;

DRAWTEXT(ISLASTBAR,YZX,'突破就买')COLORGREEN;

DRAWTEXT(ISLASTBAR,(YZX+YZA)/2,'中线观望')COLORYELLOW;

DRAWTEXT(ISLASTBAR,YZA,'破线就卖')COLORRED;

DRAWICON(CROSS(C>YZX,0.5),H,1);

DRAWICON(CROSS(C<YZA,0.5),L,2);

IF(BW,H,DRAWNULL)COLORGREEN,CIRCLEDOT,LINETHICK3;

IF(BW,(H+L)/2,DRAWNULL)COLORYELLOW,CIRCLEDOT,LINETHICK3;

IF(BW,L,DRAWNULL)COLORRED,CIRCLEDOT,LINETHICK3;