通达信红箭头买入指标公式附图

这个指标在通达信能用，而且看起来很准确，检测也没有未来函数，可惜飞狐上通不过，高手能否改成飞狐源码，谢谢。（此指标也来自本论坛，具体哪个贴子找不到了）

源码如下：
DRAWGBK(C 0, RGB(5,40,30),RGB(5,60,40),1,0,0);
DRAWTEXT_FIX(1,0,0.00,0,'★红箭头买入！'),COLORRED;
DRAWTEXT_FIX(1,0,0.5,0,'★绿箭头卖出！'),COLORGREEN;

{www.9m8.cn}进场}
P:=21;
WH1:=IF(L=LLV(L,P),L,DRAWNULL);
WH2:=CONST(BARSLAST(WH1!=DRAWNULL));
CURRBARSCOUNT =WH2+1 AND L=LLV(L,P),COLOR0000FF,LINETHICK2;
{www.9m8.cn}止盈}
H1:=IF(H=HHV(H,P),H,DRAWNULL);
H2:=CONST(BARSLAST(H1!=DRAWNULL));
CURRBARSCOUNT =H2+1 AND H=HHV(H,P),COLORGREEN, LINETHICK2;