How to make the whole area of plot gradient?

Question

There is a plot in excel like depth plot. From top to down it has a gradient color. It has nothing to do with line or data. How can I do that in R?

I simple use plot(x, y, type="l"), I could not find any method to make the area of the whole plot gradient.

Can you show a picture of such a plot? Also add sample data to work with. — NelsonGon, Aug 07 '19 at 13:08
Gradient as the background of the plot? [Like this?](https://stackoverflow.com/q/30136725/903061) — Gregor Thomas, Aug 07 '19 at 13:17
I found this thread: https://stackoverflow.com/questions/30136725/plot-background-colour-in-gradient — , Aug 08 '19 at 04:07

score 0 · Accepted Answer · answered Aug 14 '20 at 16:12

You can use a solution proposed by B. Auguie using grid.raster or rasterImage:

library(grid)
g <- rasterGrob(blues9, width=unit(1,"npc"), height = unit(1,"npc"),
interpolate = TRUE)
# grid.draw(g)

library(ggplot2)
ggplot(mtcars, aes(factor(cyl))) + # add gradient background
   annotation_custom(g, xmin=-Inf, xmax=Inf, ymin=-Inf, ymax=Inf) +
   geom_bar() # add data layer

How to make the whole area of plot gradient?

1 Answers1