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;

n1:=20;