2dbsplinecurve result 3 8 0. 4 0.13 1 0.28 1 0.47 1  0.62 1  0.75 1 0.89 1  1. 4  -19.5 -4.2 1 -18.9 -4.7 1  -17.3 5.0 1  -8.7 10.9  1  -0.018 1.27  1 0.38 -8.0  1 3.4 -16.3 1  11.0 -20.45 1  17.33 -15.42 1  17.7 -15 1
2dpmirror result 0 0 
set length 61.864387478917727