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geom_tile with only one possible value is grey #907
Description
There seems to be a problem when a fill value in geom_tile only has one possible value.
Example below. You get grey instead of the color ggplot2 uses. This is an issue when you facet a geom_tile and one facet only contains one possible value. Then you get a completely grey tile instead of what color the value should have.
I'm guessing this has to do with scaling? Since you get NaN if you scale only identical values.
pp <- function (n,r=4) {
x <- seq(-r*pi, r*pi, len=n)
df <- expand.grid(x=x, y=x)
df$r <- sqrt(df$x^2 + df$y^2)
# df$z <- 1
df$z <- c(1,2)
df
}
p <- ggplot(pp(20), aes(x=x,y=y))
p <- p + geom_tile(aes(fill=z))
p
ggplotly(p)
ggplot:
plotly:
pp <- function (n,r=4) {
x <- seq(-r*pi, r*pi, len=n)
df <- expand.grid(x=x, y=x)
df$r <- sqrt(df$x^2 + df$y^2)
df$z <- 1
# df$z <- c(1,2)
df
}
p <- ggplot(pp(20), aes(x=x,y=y))
p <- p + geom_tile(aes(fill=z))
p
ggplotly(p)
ggplot:
plotly:
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