简单实用（趋势布林极限）副图

N:=20;P:=2;   
顶:1,COLORYELLOW;
底:0,COLORRED;
VAR1:=MA(CLOSE,N);
VAR2:=VAR1+P*STD(CLOSE,N);
VAR3:=VAR1-P*STD(CLOSE,N);
布林趋势: (CLOSE-VAR3)/(VAR2-VAR3);
DRAWICON(CROSS(布林趋势,0),0,1);
DRAWICON(CROSS(1,布林趋势),1,2);

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