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new found love for ggplot2

From http://wiki.stdout.org/rcookbook/Graphs/Colors%20(ggplot2)/

Mapping variable values to colors

Instead of changing colors globally, you can map variables to colors — in other words, make the color conditional on a variable, by putting it inside an aes() statement

# Bars: x and fill both depend on cond2
ggplot(df, aes(x=cond, y=yval, fill=cond)) + geom_bar()

# Bars with other dataset; fill depends on cond2
ggplot(df2, aes(x=cond1, y=yval)) + 
    geom_bar(aes(fill=cond2),   # fill depends on cond2
             colour="black",    # Black outline for all
             position=position_dodge()) # Put bars side-by-side instead of stacked

# Lines and points; colour depends on cond2
ggplot(df2, aes(x=cond1, y=yval)) + 
    geom_line(aes(colour=cond2, group=cond2)) + # colour, group both depend on cond2
    geom_point(aes(colour=cond2),               # colour depends on cond2
               size=3)                          # larger points, different shape
# Equivalent to above; but move "colour=cond2" into the global aes() mapping
ggplot(df2, aes(x=cond1, y=yval, colour=cond2)) + 
    geom_line(aes(group=cond2)) +
    geom_point(size=3)
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