Graphics Reference
In-Depth Information
# With a gradient between two colors
p
+
scale_colour_gradient(low
=
"black"
, high
=
"white"
)
# A gradient with a white midpoint
library(scales)
p
+
scale_colour_gradient2(low
=
muted(
"red"
), mid
=
"white"
, high
=
muted(
"blue"
),
midpoint
=
110
)
# A gradient of n colors
p
+
scale_colour_gradientn(colours
=
c(
"darkred"
,
"orange"
,
"yellow"
,
"white"
))
Figure 12-12. Clockwise from top left: default colors, two-color gradient with
scale_colour_gradient(), three-color gradient with midpoint with scale_colour_gradient2(), four-
color gradient with scale_colour_gradientn()
For fill scales, use
scale_fill_xxx()
versions instead, where
xxx
is one of
gradient
,
gradi-
ent2
, or
gradientn
.