Graphics Reference
In-Depth Information
library(plyr)
# For the desc() function
ggplot(uspopage, aes(x
=
Year, y
=
Thousands, fill
=
AgeGroup, order
=
desc(AgeGroup)))
+
geom_area(colour
=
"black"
, size
=
.2
, alpha
=
.4
)
+
scale_fill_brewer(palette
=
"Blues"
)
Figure 4-22. Reversed stacking order
Since each filled area is drawn with a polygon, the outline includes the left and right sides. This
might be distracting or misleading. To get rid of it (
Figure 4-23
), first draw the stacked areas
withoutan outline (by leaving
colour
as the default
NA
value), and then add a
geom_line()
on
top:
ggplot(uspopage, aes(x
=
Year, y
=
Thousands, fill
=
AgeGroup, order
=
desc(AgeGroup)))
+
geom_area(colour
=
NNA
, alpha
=
.4
)
+
scale_fill_brewer(palette
=
"Blues"
)
+
geom_line(position
=
"stack"
, size
=
.2
)
