[R] grid: clipping points to viewport?

[M.Kondrin]

Why command
grid.points(c(0,1,1.1),c(0,1,1.1),vp=viewport(w=0.5,h=0.5,x=0.5,y=0.5,clip=TRUE))
does not clip points (point (1.1,1.1) is still visible), although there
is no problem with grid.lines(...)?
And one more question - how can I swap direction of tick marks on
grid.x(y)axis to turn it inside plot?

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