Graphics Reference
In-Depth Information
1900
25 - 34
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1900
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The default order of legend items is the opposite of the stacking order. The legend can be re-
versed by setting the breaks in the scale. This version of the chart ( Figure 4-21 ) reverses the le-
gend order, changes the palette to a range of blues, and adds thin ( size=.2 ) lines between each
area. It also makes the filled areas semitransparent ( alpha=.4 ), so that it is possible to see the
grid lines through them:
ggplot(uspopage, aes(x = Year, y = Thousands, fill = AgeGroup)) +
geom_area(colour = "black" , size = .2 , alpha = .4 ) +
scale_fill_brewer(palette = "Blues" , breaks = rev(levels(uspopage$AgeGroup)))
Figure 4-21. Reversed legend order, lines, and a different palette
To reverse the stacking order, we'll put order=desc(AgeGroup) inside of aes() ( Figure 4-22 ):
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