geom_textcontour {geomtextpath} | R Documentation |
Produce labelled contour lines in ggplot2
Description
Contour lines are available already in ggplot2, but the
native geom_contour
does not allow the lines to
be labelled with the level of each contour. geom_textcontour
adds this
ability.
Usage
geom_textcontour(
mapping = NULL,
data = NULL,
stat = "textcontour",
position = "identity",
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE,
lineend = "butt",
linejoin = "round",
linemitre = 10,
bins = NULL,
binwidth = NULL,
breaks = NULL,
...
)
geom_labelcontour(
mapping = NULL,
data = NULL,
stat = "textcontour",
position = "identity",
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE,
...,
lineend = "butt",
linejoin = "round",
linemitre = 10,
bins = NULL,
binwidth = NULL,
breaks = NULL,
label.padding = unit(0.25, "lines"),
label.r = unit(0.15, "lines"),
arrow = NULL
)
stat_textcontour(
mapping = NULL,
data = NULL,
geom = "textcontour",
position = "identity",
...,
bins = NULL,
binwidth = NULL,
breaks = NULL,
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE
)
Arguments
mapping |
Set of aesthetic mappings created by aes() . If specified and
inherit.aes = TRUE (the default), it is combined with the default mapping
at the top level of the plot. You must supply mapping if there is no plot
mapping.
|
data |
The data to be displayed in this layer. There are three
options:
If NULL , the default, the data is inherited from the plot
data as specified in the call to ggplot() .
A data.frame , or other object, will override the plot
data. All objects will be fortified to produce a data frame. See
fortify() for which variables will be created.
A function will be called with a single argument,
the plot data. The return value must be a data.frame , and
will be used as the layer data. A function can be created
from a formula (e.g. ~ head(.x, 10) ).
|
stat |
The statistical transformation to use on the data for this
layer, either as a ggproto Geom subclass or as a string naming the
stat stripped of the stat_ prefix (e.g. "count" rather than
"stat_count" )
|
position |
Position adjustment, either as a string naming the adjustment
(e.g. "jitter" to use position_jitter ), or the result of a call to a
position adjustment function. Use the latter if you need to change the
settings of the adjustment.
|
na.rm |
If FALSE , the default, missing values are removed with
a warning. If TRUE , missing values are silently removed.
|
show.legend |
logical. Should this layer be included in the legends?
NA , the default, includes if any aesthetics are mapped.
FALSE never includes, and TRUE always includes.
It can also be a named logical vector to finely select the aesthetics to
display.
|
inherit.aes |
If FALSE , overrides the default aesthetics,
rather than combining with them. This is most useful for helper functions
that define both data and aesthetics and shouldn't inherit behaviour from
the default plot specification, e.g. borders() .
|
lineend |
Line end style (round, butt, square).
|
linejoin |
Line join style (round, mitre, bevel).
|
linemitre |
Line mitre limit (number greater than 1).
|
bins |
Number of contour bins. Overridden by breaks .
|
binwidth |
The width of the contour bins. Overridden by bins .
|
breaks |
One of:
Numeric vector to set the contour breaks
A function that takes the range of the data and binwidth as input
and returns breaks as output. A function can be created from a formula
(e.g. ~ fullseq(.x, .y)).
Overrides binwidth and bins . By default, this is a vector of length
ten with pretty() breaks.
|
... |
Other arguments passed on to layer . These are often aesthetics, used to set an aesthetic to a fixed value, like colour = "red" or size = 3 . These can also be the following text-path parameters:
text_only A logical(1) indicating whether the path part should be plotted along with the text (FALSE , the default). If TRUE , any parameters or aesthetics relating to the drawing of the path will be ignored.
gap A logical(1) which if TRUE , breaks the path into two sections with a gap on either side of the label. If FALSE , the path is plotted as a whole. Alternatively, if NA , the path will be broken if the string has a vjust between 0 and 1, and not otherwise. The default for the label variant is FALSE and for the text variant is NA .
upright A logical(1) which if TRUE (default), inverts any text where the majority of letters would upside down along the path, to improve legibility. If FALSE , the path decides the orientation of text.
halign A character(1) describing how multi-line text should be justified. Can either be "center" (default), "left" or "right" .
offset A unit object of length 1 to determine the offset of the text from the path. If this is NULL (default), the vjust parameter decides the offset. If not NULL , the offset argument overrules the vjust setting.
parse A logical(1) which if TRUE , will coerce the labels into expressions, allowing for plotmath syntax to be used.
straight A logical(1) which if TRUE , keeps the letters of a label on a straight baseline and if FALSE (default), lets individual letters follow the curve. This might be helpful for noisy paths.
padding A unit object of length 1 to determine the padding between the text and the path when the gap parameter trims the path.
text_smoothing a numeric(1) value between 0 and 100 that smooths the text without affecting the line portion of the geom. The default value of 0 means no smoothing is applied.
rich A logical(1) whether to interpret the text as html/markdown formatted rich text. Default: FALSE . See also the rich text section of the details in geom_textpath() .
remove_long if TRUE, labels that are longer than their associated path will be removed.
|
label.padding |
Amount of padding around label. Defaults to 0.25 lines.
|
label.r |
Radius of rounded corners. Defaults to 0.15 lines.
|
arrow |
Arrow specification, as created by grid::arrow() .
|
geom |
The geometric object to use display the data
|
Value
A Layer
ggproto object that can be added to a plot.
Aesthetics
geom_textcontour()
understands the following aesthetics (required aesthetics are in bold):
-
x
-
y
-
alpha
-
angle
-
colour
-
family
-
fontface
-
group
-
hjust
-
linecolour
-
lineheight
-
linetype
-
linewidth
-
size
-
spacing
-
textcolour
-
vjust
In addition to aforementioned aesthetics, geom_labelcontour()
also understands:
-
boxcolour
-
boxlinetype
-
boxlinewidth
-
fill
The spacing
aesthetic allows fine control of spacing
of text, which is called 'tracking' in typography.
The default is 0 and units are measured in 1/1000 em.
Numbers greater than zero increase the spacing,
whereas negative numbers decrease the spacing.
Learn more about setting these aesthetics
in vignette("ggplot2-specs")
.
Computed variables
The variable 'level' is a numeric or a factor
depending on whether lines or bands are calculated.
- 'level'
Height of contour. This is a numeric vector that
represents bin boundaries.
See Also
Other geom layers that place text on paths.
Examples
df <- expand.grid(x = seq(nrow(volcano)), y = seq(ncol(volcano)))
df$z <- as.vector(volcano)
ggplot(df, aes(x, y, z = z)) +
geom_contour_filled(bins = 6, alpha = 0.6) +
geom_textcontour(bins = 6, size = 2.5, padding = unit(0.05, "in")) +
scale_fill_manual(values = terrain.colors(11)) +
theme_classic() +
theme(legend.position = "none")
[Package
geomtextpath version 0.1.4
Index]