package grid: mirror grob objects along an axis
You can rotate the viewport to flip around the horizontal axis,
library(grid)
grid.text("Chiral")
grid.text("Chiral", vp=viewport(angle=180, y=unit(0.5,"npc")-unit(1,"line")))
HTH,
b.
On 23 May 2012 05:34, Thomas Zumbrunn <t.zumbrunn at unibas.ch> wrote:
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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