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I am curious if it is possible to change the layout of the ggplot legend without having to rewrite the build_legend function?
For example:
I want a 2 * 2 layout
a b
c d
rather than the normal 1 * 4 or 4 * 1 layout.
a b c d
or
a
b
c
d
Many Thanks,
MK
291
You can place the legend literally anywhere. To put it around the chart, use the legend. position option and specify top , right , bottom , or left . To put it inside the plot area, specify a vector of length 2, both values going between 0 and 1 and giving the x and y coordinates.
You can use the following syntax to change the legend labels in ggplot2: p + scale_fill_discrete(labels=c('label1', 'label2', 'label3', ...))
You can use the following syntax to change the order of the items in a ggplot2 legend: scale_fill_discrete(breaks=c('item4', 'item2', 'item1', 'item3', ...) The following example shows how to use this syntax in practice.
I don't actually think this is possible with ggplot2, you really only have two options - horizontal or vertical. If you want to create something fancier, you'd have to do it yourself by creating a subplot with the same colour scheme, resizing and overlaying it onto your plot (I would envision something like a small facet_grid() placed wherever it may be appropriate).
... + opts(legend.direction="horizontal")
... + opts(legend.direction="vertical")
Kohske has posted the solution to the problem, although it will not be available until the next version of ggplot.
qplot(1:4, 1:4, colour = letters[1:4]) + guides(colour = guide_legend(nrow = 2, byrow = T))
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