hexbin is broken

[mgrabovsky]

It looks like since at least the latest release (3.4.0) geom_hex is broken in some way. For an example, see the documentation:

(Current state on left, expected output on the right.)

[yutannihilation]

Thanks, confirmed. I'm yet to figure out what's happening here, but it seems #4671 makes this difference.

[micans]

I experienced the same, with very large artefacts -- high density called where density is in fact very low for my actual data of interest.

Applying geom_hex to a simple uniform object shows big differences between version 3.4.0 and 3.3.5:

v <- expand.grid(1:100,1:100)
myscale2 <- scale_fill_gradientn(name = "count",
              trans = "log",
                values=c(0.0,0.4,0.6,0.8,1.0),
                  colors=c("darkblue", "lightblue", "yellow", "orange", "red"),
                    breaks=c(2,4,8,16), labels=c(2,4,8,16))
mybins <- 20
pdf("ggplot340sq100bin20hex.pdf")
ggplot(v, aes(Var1,Var2)) + ggplot2::geom_hex(bins=mybins) + myscale2 + ggtitle("hex")
dev.off()

yields

Whereas for version 335 this gives