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)
###
plot(c(-5,5), c(-5,5), asp=1, type='n' )
thrust(ff$x, ff$y, h=2, N=14, REV=FALSE)
########## reverse side:
plot(c(-5,5), c(-5,5), asp=1, type='n' )
thrust(ff$x, ff$y, h=2, N=14, REV=TRUE)
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