Pass label to draw_key_text

[brianwdavis]

To override the default "a" in the label of a text legend: first check if data$label has anything in it; if not, use "a" as before. However, if the user sets a label within guide_legend(override.aes = list(label = "foo")), then use that label or vector of labels as the first arg of textGrob.

Motivation

This is a relatively common request on SO, to wit: https://stackoverflow.com/questions/48892982/change-key-letter-in-legend-of-ggplot

The problem

The current version of draw_key_text has a hardcoded "a" as the first arg of textGrob.

Example using the fix

ggplot(mtcars, aes(mpg, wt, color = factor(am), label = disp)) +
  geom_text() +
  guides(color = guide_legend(override.aes = list(label = c("a", "m"))))

[hadley]

Nice!

Can you please add a bullet to NEWS? It should briefly describe the change (starting with name of the function), and crediting yourself with (@yourname, #issuenumber).

[brianwdavis]

Added under the Scales section.

[hadley]

Thanks!

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