Nothing
`thrust` <-
function(x,y, h=1, N=1, REV=FALSE, endtol=.1, col='black', ...)
{
if(missing(N)) N = 1
if(missing(REV)) REV=FALSE
if(missing(h)) { h=1 }
if(missing(col)) { col='black' }
if(missing(endtol)) { endtol=.1 }
if(REV){ x= rev(x); y = rev(y) }
pin = par("pin")
u = par('usr')
## h = 1 mm
## r =0.875 mm
## uinch = (u[4]-u[3])/pin[2]
### 2.54 cn per inch
umm = (u[4]-u[3])/pin[2]/25.4
### 2.54 cn per inch
###25.4 mm/inch
stickh = h*umm
g = PointsAlong(x, y, N=N, endtol=endtol)
### vperp = list(x=-rot$sn, y=rot$cs)
### plot(c(-1,1), c(-1,1), type='n', asp=TRUE)
lines(x,y, col=col, ...)
rot=list(cs = g$rot$cs , sn = g$rot$sn)
### rot=list(cs = g$rot$cs , sn = g$rot$sn )
teeth(g$x, g$y, stickh, g$rot, col=col)
}
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