平曲線坐標(biāo)、反算樁號(hào)計(jì)算程序
prog "PQX"
{mn}:M"X0":N"Y0":Defm 1:Z[1]=0
Lbl 1:{ABGHVWK}:K"JL":G"JX":H"JY":V"I0":W"J0":A"R":B"LS":Fixm
P=B^2/24/A:Q=B/2-B^3/240/A^2:T=(A+P)tan(Abs W/2)+Q:C=K-T:D=C+B:F=D+π*A*AbsW/180:E=F-B
w<0=>s=-1:≠=>s=1△
Lbl 2:{L}:L:L=0=>GOTO 1△
Lbl 6:L≤C=>O=K-L:R=G-OcosV:U=H-OsinV:Z=V:GOTO 3△
L≥F=>O=L-F+T:Z=V+W:R=G+OcosZ:U=H+OsinZ:GOTO 3△
L<D=>O=L-C:prog "XY":Z=V+SR:R=G+(I-T)cosV-SJsinV:U=H+(I-T)sinV+JScosV:GOTO 3△
L>E=>O=F-L:prog "XY":O=V+W:Z=O-SR:R=G+(T-I)cosO-SJsinO:U=H+(T-I)sinO+SJcosO:GOTO 3△
O=180(L-D+B/2)/π/A:I=AsinO+Q:J=P+A(1-cosO):Z=V+SO:R=G-(T-I)cosV-SJsinV:U=H-(T-I)sinV+SJcosV
Lbl 3:Z[1]=0.002=>GOTO 5:≠=>O=0△R"XL"◢U"YL"◢Z"ZL"◢
Lbl 4:{O}:O"YC":O=0=>GOTO 2△
O=-1=>GOTO 5△
X=R-OsinZ:Y=U+OcosZ:pol(X-M,Y-N:J<0=>J=J+360△
X"XZ"◢Y"YZ"◢J"A0"◢I"DD"◢GOTO 4
Lbl 5:{XY}:X"XF":X=-1=>Z[1]=0:GOTO 4△Y"YF":pol(X-R,Y-U:O=Icos(J-Z):AbsO≤0.001=>O"DL"◢L+O◢O=Isin(J-Z):O"YC"◢GOTO 5:≠=>Z[1]=0.002:L=L+O:GOTO 6△
prog "XY"
U=AB:I=O-O^5/40/U^2:J=O^3/6/U-O^7/336/U^3:R=90O^2/π/U
變量名稱說明：
M"X0":N"Y0"為測(cè)站點(diǎn)坐標(biāo)
K"JL":G"JX":H"JY":V"I0":W"J0":A"R":B"LS"分別為交點(diǎn)樁號(hào)、坐標(biāo)、起始方位角、轉(zhuǎn)角(左-右+)、半徑、緩長(zhǎng)
L、R"XL"、U"YL"、Z"ZL" 分別為輸入樁號(hào)、求出中樁坐標(biāo)、即時(shí)方位角
O"YC"：X"XZ"◢Y"YZ"◢J"A0"◢I"DD" 分別為輸入邊樁距離(左-右+)、求出邊樁坐標(biāo)、邊樁點(diǎn)到測(cè)站點(diǎn)的方位角和平距
O"YC"=0返回計(jì)算中樁坐標(biāo)
O"YC"=-1進(jìn)入計(jì)算樁號(hào)過程(輸入坐標(biāo)X"XF" 、Y"YF"分別為求出樁號(hào)L+O,及至中樁邊距O"YC"，O"DL"為樁號(hào)計(jì)算的誤差距)
O"YC"=約0.00001可求中樁點(diǎn)到測(cè)站點(diǎn)方位角和平距
X"XF"=-1返回計(jì)算坐標(biāo)過程
計(jì)算樁號(hào)過程時(shí)，需多次確認(rèn)輸入的坐標(biāo)X"XF"、Y"YF"直到出現(xiàn)O"DL"樁號(hào)誤差距較小時(shí)即可得出準(zhǔn)確的樁號(hào)
=>前不用冒號(hào)
≠=>前有冒號(hào)
△前后不用冒號(hào)
