I'm trying to create a layout with named viewports that I can use for
other functions. I create the viewport tree that I want, and a list
of grobs with the viewports describing where they should go.
library(grid)
vp <- vpTree(
viewport(layout=grid.layout(2,2), name="layout"),
children=vpList(
viewport(layout.pos.col = 1, layout.pos.row=1, name="tl"),
viewport(layout.pos.col = 2, layout.pos.row=2, name="br")
)
)
grobs <- gList(
rectGrob(vp="tl"),
textGrob("Top left", vp="tl"),
textGrob("Bottom right", vp="br")
)
I can draw the grobs using the following code:
grid.newpage()
pushViewport(vp)
upViewport(1)
grid.draw(grobs)
But I want a grob that represents those grobs drawn in the appropriate
viewports. I had hoped I could do something like:
grid.newpage()
grid.draw(gTree(vp=vp, children = grobs))
But I get:
Error in downViewport.vpPath(vp, strict = TRUE, recording = FALSE) :
Viewport 'tl' was not found
presumably because no equivalent of the upViewport(1) command is used.
What should I be doing here?
Thanks,
Hadley
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