plot(c(-5,5), c(-5,5), asp=1, type='n' )
ff=list()
ff$x=c(-4.850,-4.700,-3.934,-2.528, 0.603, 2.647, 3.861, 2.626)
ff$y=c(-4.045,-2.087,-0.710, 0.172, 1.291, 2.087,-0.753,-4.131)
G =getsplineG(ff$x, ff$y, kdiv=20)
g = PointsAlong(G$x, G$y, N=5)
lines(G)
perpen(g$x, g$y, 5, g$rot, col = "black", lwd = 1)
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