geom_bin has white dots on the borders

[idavydov]

When creating geom_bin plot, white dots are introduced between the bins. Is it possible to get rid of those?

The same is reproduced in the current master (f84e315) & current cran (2.2.1) versions on the latest R (3.4.0).

library(ggplot2)
N=1000
d <- data.frame(x=rnorm(N), y=rnorm(N))
## png('hex.png')
ggplot(d, aes(x, y)) + geom_hex()
## dev.off()

[idavydov]

While this looks like a bug to me, it seems there's a workaround. You can add border of the same color:

library(ggplot2)
N=1000
d <- data.frame(x=rnorm(N), y=rnorm(N))
## png('hex.png')
ggplot(d, aes(x, y)) + geom_hex(col=..count..)
## dev.off()

[karawoo]

I can't reproduce the white dots. When I run the first example I get a consistent light border around all the hexagons:

[idavydov]

@karawoo I think it is OS and device specific.
It is reproduced on GNU/Linux with X11 or png device (two different machines, one with R 3.4.0, another with 3.2.3). But it cannot be reproduced if the pdf() device is used.

1. Could you try to reproduce this with GNU/Linux+X11?
2. If it is device specific, can this be an expected behavior for some devices?

[hadley]

Yeah, this is an issue with your graphics device so there's nothing ggplot2 can do about it.