alpha should work on line geom_sf()

[yutannihilation]

library(ggplot2)
library(sf)
#> Linking to GEOS 3.7.2, GDAL 3.0.1, PROJ 6.2.0

d <- data.frame(x = 1:5, y = 1:5)

l <- st_linestring(as.matrix(d))
sf <- st_sf(geometry = st_sfc(l))

p1 <- ggplot(d, aes(x, y)) + geom_line(alpha = 0.1) + ggtitle("geom_line()")
p2 <- ggplot(sf) + geom_sf(alpha = 0.1) + ggtitle("geom_sf()")

patchwork::wrap_plots(p1, p2)

^{Created on 2019-10-27 by the reprex package (v0.3.0)}

[yutannihilation]

I'll fix this when #3546 gets merged. It would be easy as just adding | is_line here:

ggplot2/R/geom-sf.R

Line 152 in 6f5ffea

col[is_point] <- alpha(col[is_point], alpha[is_point])

[thomasp85]

yeah - that is an oversight on my part. Good catch, and your fix should work nicely

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