Hello -
If I create multiple pieces of output in grid, and use grid.remove() to
try to remove the output from the graphics device, I cannot seem to
remove the final piece of output from the device until I 'refresh' the
graphics device by giving it focus. The function grid.remove() does
appear to remove the grob from the display list, however.
I noticed this when the example on page 200-201 in Paul Murrell's R
Graphics book did not work as expected when using
grid.remove("circles"). Can anyone replicate this?
## Example
library(grid)
## Create two circles
grid.circle(name = "redcircle", r = .20, gp = gpar(col = "red"))
grid.circle(name = "bluecircle", r = .25, gp = gpar(col = "blue"))
## removes the blue circle
grid.remove("bluecircle")
## the red circle will be deleted from the grid display list, but
## the graphics device will still show it until I 'refresh' the
## device by giving it focus via mouse or alt+tab, or producing
## more grid output
grid.remove("redcircle") ## still on my X11 device!
## more grid output
grid.text("Now the circle is gone!", name = "txt")
## But I can't get rid of this text on the device
## until I refresh device or do another grid call
grid.remove("txt") ## still on my X1 device!
> sessionInfo()
R version 2.6.2 (2008-02-08)
i686-pc-linux-gnu
locale:
LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=en_US.UTF-8;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFICATION=C
attached base packages:
[1] grid stats graphics grDevices utils datasets methods
[8] base
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