gf_text | R Documentation |
Text geoms are useful for labeling plots. They can be used by themselves as
scatterplots or in combination with other geoms, for example, for labeling
points or for annotating the height of bars. geom_text()
adds only text
to the plot. geom_label()
draws a rectangle behind the text, making it
easier to read.
gf_text(
object = NULL,
gformula = NULL,
data = NULL,
...,
label,
alpha,
angle,
color,
family,
fontface,
group,
hjust,
lineheight,
size,
vjust,
parse = FALSE,
nudge_x = 0,
nudge_y = 0,
check_overlap = FALSE,
xlab,
ylab,
title,
subtitle,
caption,
geom = "text",
stat = "identity",
position = "nudge",
show.legend = NA,
show.help = NULL,
inherit = TRUE,
environment = parent.frame()
)
gf_label(
object = NULL,
gformula = NULL,
data = NULL,
...,
label,
alpha,
angle,
color,
family,
fontface,
group,
hjust,
vjust,
lineheight,
size,
parse,
nudge_x = 0,
nudge_y = 0,
label.padding = unit(0.25, "lines"),
label.r = unit(0.15, "lines"),
label.size = 0.25,
xlab,
ylab,
title,
subtitle,
caption,
stat = "identity",
position = "nudge",
show.legend = NA,
show.help = NULL,
inherit = TRUE,
environment = parent.frame()
)
object |
When chaining, this holds an object produced in the earlier portions of the chain. Most users can safely ignore this argument. See details and examples. |
gformula |
A formula with shape |
data |
The data to be displayed in this layer. There are three options: If A A |
... |
Additional arguments. Typically these are
(a) ggplot2 aesthetics to be set with |
label |
The text to be displayed. |
alpha |
Opacity (0 = invisible, 1 = opaque). |
angle |
An angle for rotating the text. |
color |
A color or a formula used for mapping color. |
family |
A font family. |
fontface |
One of |
group |
Used for grouping. |
hjust, vjust |
Numbers between 0 and 1 indicating how to justify text relative the the specified location. |
lineheight |
Line height. |
size |
A numeric size or a formula used for mapping size. |
parse |
If |
nudge_x, nudge_y |
Horizontal and vertical adjustment to nudge labels by.
Useful for offsetting text from points, particularly on discrete scales.
Cannot be jointly specified with |
check_overlap |
If |
xlab |
Label for x-axis. See also |
ylab |
Label for y-axis. See also |
title, subtitle, caption |
Title, sub-title, and caption for the plot.
See also |
geom |
A character string naming the geom used to make the layer. |
stat |
The statistical transformation to use on the data for this
layer, either as a |
position |
Position adjustment, either as a string, or the result of
a call to a position adjustment function. Cannot be jointly specified with
|
show.legend |
logical. Should this layer be included in the legends?
|
show.help |
If |
inherit |
A logical indicating whether default attributes are inherited. |
environment |
An environment in which to look for variables not found in |
label.padding |
Amount of padding around label. Defaults to 0.25 lines. |
label.r |
Radius of rounded corners. Defaults to 0.15 lines. |
label.size |
Size of label border, in mm. |
a gg object
Positional attributes (a.k.a, aesthetics) are specified using the formula in gformula
.
Setting and mapping of additional attributes can be done through the
use of additional arguments.
Attributes can be set can be set using arguments of the form attribute = value
or
mapped using arguments of the form attribute = ~ expression
.
In formulas of the form A | B
, B
will be used to form facets using
facet_wrap()
or facet_grid()
.
This provides an alternative to
gf_facet_wrap()
and
gf_facet_grid()
that is terser and may feel more familiar to users
of lattice.
Evaluation of the ggplot2 code occurs in the environment of gformula
.
This will typically do the right thing when formulas are created on the fly, but might not
be the right thing if formulas created in one environment are used to create plots
in another.
ggplot2::geom_text()
data(penguins, package = "palmerpenguins")
gf_text(bill_length_mm ~ bill_depth_mm,
data = penguins,
label = ~species, color = ~species, size = 2, angle = 30
)
penguins |>
gf_point(bill_length_mm ~ bill_depth_mm, color = ~species, alpha = 0.5) |>
gf_text(bill_length_mm ~ bill_depth_mm,
label = ~species, color = ~species,
size = 2, angle = 0, hjust = 0, nudge_x = 0.1, nudge_y = 0.1
)
if (require(dplyr)) {
data(penguins, package = "palmerpenguins")
penguins_means <-
penguins |>
group_by(species) |>
summarise(bill_length_mm = mean(bill_length_mm), bill_depth_mm = mean(bill_depth_mm))
gf_point(bill_length_mm ~ bill_depth_mm, data = penguins, color = ~species) |>
gf_label(bill_length_mm ~ bill_depth_mm,
data = penguins_means,
label = ~species, color = ~species, size = 2, alpha = 0.7
)
}
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