Create custom scales / aesthetics for lineribbons

[mjskay]

including:

• [ ] make alpha only apply to ribbons by default (? - might need to remove duplicate lines)
• [ ] make aesthetics to target alpha on ribbon versus line separately
• [ ] outline color on ribbons

[ASKurz]

Just ran into this problem. I'd like to set ribbon fill, but not the line, semitransparent. Is there a current workaround for this?

[mjskay]

The simplest workaround would probably be to disable the line (color = NA) and then draw the line as a separate geom. That, or you could try assigning a fill color that has an alpha component to it (not 100% sure that would work)

[ASKurz]

Got it. After playing around, this works:

data %>% 
  ggplot(aes(x = x, y = Estimate, ymin = Q2.5, ymax = Q97.5,
             fill = condition, color = condition)) +
  geom_lineribbon() +
  scale_fill_viridis_d(alpha = 1/2) +
  scale_color_viridis_d()

[mjskay]

Awesome! Had no idea the color scales had an alpha argument, that's very useful!