Shading with geom_rect

Use geom_rect() with the min/max set to -Inf and Inf to add a pleasant shading to your facets.

For example by passing it a data frame with the faceting variables and a column to use for the color (green if positive, red if negative) we can make facets behave like cells in a heatmap!

# > tp2
# # A tibble: 23 x 5
#    Condition   Trace             Time  Change StimId
#    <fct>       <chr>             <chr>  <dbl> <chr> 
#  1 PS.0.orig   170623b_0007.abf  60         1 a     
#  2 PS.45.orig  170825a_0008.abf  60        -1 c     

ggplot(df)+
  geom_rect(data = tp2, aes(fill = Change),xmin = -Inf,xmax = Inf, ymin = -Inf,ymax = Inf,alpha = 0.3) +
  geom_hline(yintercept = 0, color = "cornflowerblue")+
  geom_pointline(aes(x = Time, y = rc, group = Experiment), shape = 1, color = "black")+
  ylim(-2, 3.5)+
  scale_fill_gradientn(colors = c("Red", "Grey", "Green"))+
  theme_base()+
  theme(legend.position = "")

image (5).png