This guide is a version of the guide_legend()
guide for binned scales. It
differs in that it places ticks correctly between the keys, and sports a
small axis to better show the binning. Like guide_legend()
it can be used
for all non-position aesthetics though colour and fill defaults to
guide_coloursteps()
, and it will merge aesthetics together into the same
guide if they are mapped in the same way.
guide_bins(
title = waiver(),
title.position = NULL,
title.theme = NULL,
title.hjust = NULL,
title.vjust = NULL,
label = TRUE,
label.position = NULL,
label.theme = NULL,
label.hjust = NULL,
label.vjust = NULL,
keywidth = NULL,
keyheight = NULL,
axis = TRUE,
axis.colour = "black",
axis.linewidth = 0.5,
axis.arrow = NULL,
direction = NULL,
default.unit = "line",
override.aes = list(),
reverse = FALSE,
order = 0,
show.limits = NULL,
...
)
A character string indicating the position of a title. One of "top" (default for a vertical guide), "bottom", "left" (default for a horizontal guide), or "right."
A theme object for rendering the title text. Usually the
object of element_text()
is expected. By default, the theme is
specified by legend.title
in theme()
or theme.
A number specifying horizontal justification of the title text.
A number specifying vertical justification of the title text.
logical. If TRUE
then the labels are drawn. If
FALSE
then the labels are invisible.
A character string indicating the position of a label. One of "top", "bottom" (default for horizontal guide), "left", or "right" (default for vertical guide).
A theme object for rendering the label text. Usually the
object of element_text()
is expected. By default, the theme is
specified by legend.text
in theme()
.
A numeric specifying horizontal justification of the label text.
A numeric specifying vertical justification of the label text.
A numeric or a grid::unit()
object specifying
the width of the legend key. Default value is legend.key.width
or
legend.key.size
in theme()
.
A numeric or a grid::unit()
object specifying
the height of the legend key. Default value is legend.key.height
or
legend.key.size
in theme()
.
Logical. Should a small axis be drawn along the guide
Graphic specifications for the look of the axis.
A call to arrow()
to specify arrows at the end of the
axis line, thus showing an open interval.
A character string indicating the direction of the guide. One of "horizontal" or "vertical."
A character string indicating grid::unit()
for keywidth
and keyheight
.
A list specifying aesthetic parameters of legend key. See details and examples.
logical. If TRUE
the order of legends is reversed.
positive integer less than 99 that specifies the order of this guide among multiple guides. This controls the order in which multiple guides are displayed, not the contents of the guide itself. If 0 (default), the order is determined by a secret algorithm.
Logical. Should the limits of the scale be shown with labels and ticks.
ignored.
A guide object
This guide is intended to show binned data and work together with ggplot2's
binning scales. However, it is sometimes desirable to perform the binning in
a separate step, either as part of a stat (e.g. stat_contour_filled()
) or
prior to the visualisation. If you want to use this guide for discrete data
the levels must follow the naming scheme implemented by base::cut()
. This
means that a bin must be encoded as "(<lower>, <upper>]"
with <lower>
giving the lower bound of the bin and <upper>
giving the upper bound
("[<lower>, <upper>)"
is also accepted). If you use base::cut()
to
perform the binning everything should work as expected, if not, some recoding
may be needed.
Other guides:
guide_colourbar()
,
guide_coloursteps()
,
guide_legend()
,
guides()
# NOT RUN {
p <- ggplot(mtcars) +
geom_point(aes(disp, mpg, size = hp)) +
scale_size_binned()
# Standard look
p
# Remove the axis or style it
p + guides(size = guide_bins(axis = FALSE))
p + guides(size = guide_bins(show.limits = TRUE))
p + guides(size = guide_bins(
axis.arrow = arrow(length = unit(1.5, 'mm'), ends = 'both')
))
# Guides are merged together if possible
ggplot(mtcars) +
geom_point(aes(disp, mpg, size = hp, colour = hp)) +
scale_size_binned() +
scale_colour_binned(guide = "bins")
# }
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