Hi
Gustaf Rydevik wrote:
> Hi all,
>
> I'm trying to generate a plot containing a scatterplot, with marginal
> densityplots for x and y.
> However, when I try to generate a vertical densityplot, I get the
> message "warning: can't clip to rotated viewport", and nothing shows
> up. I'm probably misunderstanding how viewports are meant to be used,
> so if someone could give me a hint, I'd be most grateful.
> my system is R 2.5.0 (stuck, and can't upgrade for now) and windoms xp.
The warning says it all unfortunately; R only clips to rectangular
regions, so if you take a rectangle (viewport) and rotate it, and try to
clip to it, R can't cope (it's lattice that is trying to clip to some of
its viewports BTW).
Of course, R could be slightly smarter and check whether the rotated
rectangle is still a rectangle (aligned with the x- and y-axes). I will
look at a fix for this in the development version of R.
Unfortunately, there are still some problems with your example, because ...
pushViewport(viewport(layout.pos.row=2,layout.pos.col=2,angle=270))
... will not do what you want. The layout.pos.row/col mean that angle
(along with x, y, width, and height) is ignored. Instead you could try ...
pushViewport(viewport(layout.pos.row=2,layout.pos.col=2))
pushViewport(viewport(width=convertUnit(unit(1, "npc"),
"npc", "y", "dimension", "x"),
height=convertUnit(unit(1, "npc"),
"npc", "x", "dimension", "y"),
angle=270))
... (all that conversion is necessary because otherwise the rotated
viewport is NOT the size you probably want).
However, even then the result is not very nice because you have a lot of
work still to do to make the x- and y-scales on the three plots line up
(not just a matter of controlling the scales on each plot, but also a
matter of getting the plot margins the same size).
If it was me, I would be starting to think about writing something from
scratch in grid at this point ...
Paul
> many thanks in advance,
>
> Gustaf
>
> example:
> --------------------------
> library(lattice)
> library(grid)
> x<-rnorm(20)
> y<-rnorm(20)
> graph.layout<-grid.layout(nrow=2,ncol=2,widths=unit.c(unit(2,"null"),unit(1,"null")),heights=unit.c(unit(1,"null"),unit(2,"null")))
> graph.view<-viewport(layout=graph.layout,name="root")
> grid.newpage()
> pushViewport(gap.view)
> pushViewport(viewport(layout.pos.row=2,layout.pos.col=1))
> print(xyplot(x~y),newpage=FALSE)
> popViewport()
> pushViewport(viewport(layout.pos.row=1,layout.pos.col=1))
> print(densityplot(x),newpage=FALSE)
> popViewport()
> pushViewport(viewport(layout.pos.row=2,layout.pos.col=2,angle=270))
> print(densityplot(y),newpage=FALSE) ### I Get the warning message here.
> ----------------------------------
>
--
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
[EMAIL PROTECTED]
http://www.stat.auckland.ac.nz/~paul/
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