标题：求助写个指标

MACD底背离时候开多，顶背离时候开空

背离时候结合前面一个底部或是顶部情况，联动K线符合即可。

请详细说明

开多情况：K线行情较前面30根K线比较有创出新低后，此时MACD，diff高于这30根K线周期内diff最低值，在之后的10根K线周期内MACD若出现金叉则开多。

平多： 在开多之后第一次出现死叉则平多

开空情况：K线行情较前面30根K线比较有创出新高后，此时MACD，diff低于这30根K线周期内diff最高值，在之后的10根K线周期内MACD若出现死叉则开空。

平空： 在开空之后第一次出现金叉则平空

variable:flag=0;
hi30:=ref(hhv(h,30),1);
lo30:=ref(llv(l,30),1);
diff:=ema(close,12) - ema(close,26);
dea:=ema(diff,9);
sc:=cross(dea,diff);
jc:=cross(diff,dea);
hi30_diff:=ref(hhv(diff,30),1);
lo30_diff:=ref(llv(diff,30),1);

if flag<>-1 and h>hi30 and diff<hi30_diff then begin
 flag:=-1;
 kpos:=barpos;
end

if flag<>1 and l<lo30 and diff>lo30_diff then begin
 flag:=1;
 kpos:=barpos;
end

if holding>0 and cross(dea,diff) then begin
 sell(1,1,limitr,c);
 flag:=0;
end

if holding<0 and cross(diff,dea) then begin
 sellshort(1,1,limitr,c);
 flag:=0;
end

if flag=1 and holding=0 then begin
 if barpos-kpos<=10 and jc then begin
  buy(1,1,limitr,c);
 end
 if barpos-kpos=10 then flag:=0;
end

if flag=-1 and holding=0 then begin
 if barpos-kpos<=10 and sc then begin
  buyshort(1,1,limitr,c);
 end
 if barpos-kpos=10 then flag:=0;
end

zichan:asset,noaxis;
if barpos=1 then begin
 MaxAsset:=zichan;
 hc:=0; 
end
if zichan>MaxAsset then MaxAsset:=zichan;
if MaxAsset-zichan>hc then hc:=MaxAsset-zichan;
Maxhc:hc,linethick0;
交易次数:totaltrade,linethick0;
正确率:percentwin,linethick0;

你看看行不行

variable:b1=0,b2=0;
input:P(26,20,100,8),S(12,5,40,4),M(9,2,60,6);
DIFF := EMA(CLOSE,S) - EMA(CLOSE,P);
DEA  := EMA(DIFF,M);
MACD1 := 2*(DIFF-DEA), COLORSTICK;