[R] package grid: mirror grob objects along an axis

[Thomas Zumbrunn]

Maybe my question was not concise enough. I was referring to objects created 
with the "package "grid" (also called "grobs"), not to the function "grid" 
from package "graphics". For instance, let's say I have a polygon createad 
with grid::polygonGrob and want to mirror it along a specified axis. Of course 
one could transform the polygon's coordinates, but I was hoping that there is 
some more generic way of doing this (and that this could e.g. also be done 
with text grobs).

Cheers
/thomas



On Tuesday 22 May 2012, Rui Barradas wrote:
> Hello,
> 
> Just flip 'xlim' or 'ylim'. Or both.
> Using the iris example in help("grid"), make the following changes:
> 
> 
> op <- par(mfcol = c(2,2))  # Two columns, first is the original, second
> flipped.
> 
> with(iris,
> 
>       [... etc ...]
>      # row 1, col 2: flip x axis
>      plot(Sepal.Length, Sepal.Width, col = as.integer(Species),
>           xlim = c(8, 4), ylim = c(2, 4.5), panel.first = grid(),
>           main = "with(iris,  plot(...., panel.first = grid(), ..) )")
>      # row 2, col 2: flip y axis
>      plot(Sepal.Length, Sepal.Width, col = as.integer(Species),
>           xlim = c(4, 8), ylim = c(4.5, 2),
>           panel.first = grid(3, lty=1,lwd=2),
>           main = "... panel.first = grid(3, lty=1,lwd=2), ..")
> 
>      [... etc ...]
> )
> par(op)
> 
> 
> Hope this helps,
> 
> Rui Barradas
> 
> Thomas Zumbrunn-3 wrote
> 
> > Hi everyone
> > 
> > I'd like to flip grobs (grid graphical objects) along an axis, e.g. flip
> > grobs
> > horizontally or vertically. I couldn't find any hints, neither in the
> > documentation nor by searching the web. Does anybody know how to achieve
> > this?
> > 
> > Cheers
> > /thomas
> > 
> > ______________________________________________
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> > and provide commented, minimal, self-contained, reproducible code.
> 
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-- 
Thomas Zumbrunn, PhD
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