把这个通达信的趋势线源码改为飞狐

编写要求：

n1:=20;AA1:=BACKSET(ISLASTBAR,PEAKBARS(1,N,1)+1);AA2:=AA1>REF(AA1,1);BB1:=BACKSET(ISLASTBAR,PEAKBARS(1,N,2)+1);BB2:=BB1>REF(BB1,1);CC1:=BACKSET(ISLASTBAR,PEAKBARS(1,N,3)+1);CC2:=CC1>REF(CC1,1);AA11:=BACKSET(ISLASTBAR,TROUGHBARS(2,N,1)+1);AA21:=AA11>REF(AA11,1);BB11:=BACKSET(ISLASTBAR,TROUGHBARS(2,N,2)+1);BB21:=BB11>REF(BB11,1);CC11:=BACKSET(ISLASTBAR,TROUGHBARS(2,N,3)+1);CC21:=CC11>REF(CC11,1);①:DRAWLINE(BB2,H,AA2,H,1),COLORBLUE;②:DRAWLINE(CC2,H,BB2,H,1),COLORCC6633;③:IF(AA1,PEAK(1,N,1),DRAWNULL),COLORFFAA00;④:DRAWLINE(CC2,H,AA2,H,1),COLORLIBLUE;⑤:DRAWLINE(BB21,L,AA21,L,1),COLORYELLOW;⑥:DRAWLINE(CC21,L,BB21,L,1),COLORFF00FF;⑦:DRAWLINE(CC21,L,AA21,L,1),COLORBROWN;⑧:IF(AA11,TROUGH(2,N,1),DRAWNULL),COLORRED;{N1：20；N2：10；N3：5}AA:=REF(H,N1)=HHV(H,2*N1+1);QY:=BACKSET(AA,N1+1);CC:=FILTER(QY,N1) AND H=HHV(H,N1+1);DDD:=BARSLAST(CC);GDTS:=IF(CC,CURRBARSCOUNT,0);DINGBU:=IF(DDD,REF(H,DDD),H);{顶部}DINGBUTS:=IF(DDD,REF(GDTS,DDD),GDTS);DINGBU1:=REF(DINGBU,DDD+1);GDCS1:=CONST(DINGBUTS);DINGBUTS1:=REF(DINGBUTS,DDD+1);GDCS2:=CONST(DINGBUTS1);DINGBU2:=REF(DINGBU1,DDD+1);MM:=IF(CURRBARSCOUNT>GDCS2,0,1);高点压力:DRAWLINE(CURRBARSCOUNT=GDCS2,H,CURRBARSCOUNT=GDCS1,H,1) COLORLIBLUE;DRAWLINE(CURRBARSCOUNT=GDCS2,H,ISLASTBAR,REF(H,GDCS2-1),1),COLOR0055FF,POINTDOT,LINETHICK2;DRAWLINE(CURRBARSCOUNT=GDCS1,H,ISLASTBAR,REF(H,GDCS1-1),1),COLORYELLOW,POINTDOT,LINETHICK2;AAA1:=REF(L,N1)=LLV(L,2*N1+1);QY1:=BACKSET(AAA1,N1+1);CCC1:=FILTER(QY1,N1) AND L=LLV(L,N1+1);DD1:=BARSLAST(CCC1);DDTS:=IF(CCC1,CURRBARSCOUNT,0);YDB:=IF(DD1,REF(L,DD1),L);DDTS1:=IF(DD1,REF(DDTS,DD1),DDTS);DDCS1:=CONST(DDTS1);ZDB:=REF(YDB,DD1+1);DDTS2:=REF(DDTS1,DD1+1);DDCS2:=CONST(DDTS2);低点支撑:DRAWLINE(CURRBARSCOUNT=DDCS2,L,CURRBARSCOUNT=DDCS1,L,1) COLORMAGENTA;DRAWLINE(CURRBARSCOUNT=DDCS2,L,ISLASTBAR,REF(L,DDCS2-1),1),COLOR0055FF,POINTDOT,LINETHICK2;DRAWLINE(CURRBARSCOUNT=DDCS1,L,ISLASTBAR,REF(L,DDCS1-1),1),COLORYELLOW,POINTDOT,LINETHICK2;

解答：

 n:=5;