I was pointed to the Cairo package for plotting PNG images on a
device. I've been playing around with it, but found that after I use
the rasterImage function, I can't add anything any more to the device,
eg :
img <- readPNG(system.file("img", "Rlogo.png", package="png"))
r = as.raster(img[,,1:3])
r[img[,,4] == 0] = "white"
CairoWin()
plot(1:2,1:2,type="l")
rasterImage(r,1,1,2,2)
points(seq(1,2,by=0.1),seq(2,1,by=-0.1),col="black")
The points are not plotted anymore.
If I use the normal plotting device, I see the points plotted on top
of the image.
Cheers
Joris
--
Joris Meys
Statistical consultant
Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control
tel : +32 9 264 59 87
joris.m...@ugent.be
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