Guides for each scale can be set in call of scale_* with argument
guide, or in guides.
See also
Other guides:
guide_colourbar(),
guide_legend()
Examples
# \donttest{
# ggplot object
dat <- data.frame(x = 1:5, y = 1:5, p = 1:5, q = factor(1:5),
r = factor(1:5))
p <- ggplot(dat, aes(x, y, colour = p, size = q, shape = r)) + geom_point()
# without guide specification
p
#> Warning: Using size for a discrete variable is not advised.
# Show colorbar guide for colour.
# All these examples below have a same effect.
p + guides(colour = "colorbar", size = "legend", shape = "legend")
#> Warning: Using size for a discrete variable is not advised.
p + guides(colour = guide_colorbar(), size = guide_legend(),
shape = guide_legend())
#> Warning: Using size for a discrete variable is not advised.
p +
scale_colour_continuous(guide = "colorbar") +
scale_size_discrete(guide = "legend") +
scale_shape(guide = "legend")
#> Warning: Using size for a discrete variable is not advised.
# Remove some guides
p + guides(colour = "none")
#> Warning: Using size for a discrete variable is not advised.
p + guides(colour = "colorbar",size = "none")
#> Warning: Using size for a discrete variable is not advised.
# Guides are integrated where possible
p + guides(colour = guide_legend("title"), size = guide_legend("title"),
shape = guide_legend("title"))
#> Warning: Using size for a discrete variable is not advised.
# same as
g <- guide_legend("title")
p + guides(colour = g, size = g, shape = g)
#> Warning: Using size for a discrete variable is not advised.
p + theme(legend.position = "bottom")
#> Warning: Using size for a discrete variable is not advised.
# position of guides
p + theme(legend.position = "bottom", legend.box = "horizontal")
#> Warning: Using size for a discrete variable is not advised.
# Set order for multiple guides
ggplot(mpg, aes(displ, cty)) +
geom_point(aes(size = hwy, colour = cyl, shape = drv)) +
guides(
colour = guide_colourbar(order = 1),
shape = guide_legend(order = 2),
size = guide_legend(order = 3)
)
# }