R help - Feb 2003 - grid: clipping points to viewport?

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?

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?

Hi


M.Kondrin wrote:
> 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(...)?


What version/device is this happening on?
This works for me (R 1.6.2, X11/postscript)

> And one more question - how can I swap direction of tick marks on 
> grid.x(y)axis to turn it inside plot?


If I understand what you mean, there is no argument to grid.x(y)axis 
that will do what you want.  This is something that should probably be 
added at some piont.  For now, it is pretty straightforward to do 
something by hand.  The following may help ...

push.viewport(viewport(w=0.5,h=0.5,x=0.5,y=0.5))
x <- rnorm(10)
y <- rnorm(10)
push.viewport(dataViewport(x, y))
grid.rect(gp=gpar(col="grey"))
grid.points(x, y)
tick.loc <- grid.pretty(range(x))
grid.segments(unit(tick.loc, "native"),
               0,
               unit(tick.loc, "native"),
               unit(0.5, "lines"))
grid.lines(unit(range(tick.loc), "native"), 0)
grid.text(tick.loc, unit(tick.loc, "native"),
           unit(-0.5, "lines"))
pop.viewport(2)


Paul
-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
paul at stat.auckland.ac.nz

Paul Murrell wrote:
> Hi
>
>
> M.Kondrin wrote:
>
>> 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(...)?
>
>
>
>
> What version/device is this happening on?
> This works for me (R 1.6.2, X11/postscript) 
Paul -thank you very much!
Problem with clipping happens when I use gtk() device from Omegahat 
RGtkDevice (R ver. 1.6.1). I think I should address this question to them.