Draws labels on contours built with ggplot2::stat_contour.
geom_label_contour( mapping = NULL, data = NULL, stat = "text_contour", position = "identity", ..., min.size = 5, skip = 1, label.placer = label_placer_flattest(), parse = FALSE, nudge_x = 0, nudge_y = 0, label.padding = grid::unit(0.25, "lines"), label.r = grid::unit(0.15, "lines"), label.size = 0.25, na.rm = FALSE, show.legend = NA, inherit.aes = TRUE ) geom_text_contour( mapping = NULL, data = NULL, stat = "text_contour", position = "identity", ..., min.size = 5, skip = 1, rotate = TRUE, label.placer = label_placer_flattest(), parse = FALSE, nudge_x = 0, nudge_y = 0, stroke = 0, check_overlap = FALSE, na.rm = FALSE, show.legend = NA, inherit.aes = TRUE )
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
The data to be displayed in this layer. There are three options:
NULL, the default, the data is inherited from the plot
data as specified in the call to
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.
function will be called with a single argument,
the plot data. The return value must be a
will be used as the layer data. A
function can be created
~ head(.x, 10)).
The statistical transformation to use on the data for this
layer, either as a
Geom subclass or as a string naming the
stat stripped of the
stat_ prefix (e.g.
"count" rather than
Position adjustment, either as a string, or the result of
a call to a position adjustment function. Cannot be jointy specified with
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. They may also be parameters
to the paired geom/stat.
minimum number of points for a contour to be labelled.
number of contours to skip
a label placer function. See
TRUE, the labels will be parsed into expressions and
displayed as described in
Horizontal and vertical adjustment to nudge labels by.
Useful for offsetting text from points, particularly on discrete scales.
Cannot be jointly specified with
Amount of padding around label. Defaults to 0.25 lines.
Radius of rounded corners. Defaults to 0.15 lines.
Size of label border, in mm.
FALSE, the default, missing values are removed with
a warning. If
TRUE, missing values are silently removed.
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
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.
logical indicating whether to rotate text following the contour.
numerical indicating width of stroke relative to the size of the text. Ignored if less than zero.
TRUE, text that overlaps previous text in the
same layer will not be plotted.
check_overlap happens at draw time and in
the order of the data. Therefore data should be arranged by the label
column before calling
geom_text(). Note that this argument is not
Is best used with a previous call to ggplot2::stat_contour with the same
parameters (e.g. the same
Note that while
geom_text_contour() can angle itself to follow the contour,
this is not the case with
geom_text_contour understands the following aesthetics (required aesthetics are in bold):
Other ggplot2 helpers:
data.table::setDTthreads(1) library(ggplot2) v <- reshape2::melt(volcano) g <- ggplot(v, aes(Var1, Var2)) + geom_contour(aes(z = value)) g + geom_text_contour(aes(z = value)) g + geom_text_contour(aes(z = value), stroke = 0.2) g + geom_text_contour(aes(z = value), stroke = 0.2, stroke.colour = "red") g + geom_text_contour(aes(z = value, stroke.colour = after_stat(level)), stroke = 0.2) + scale_colour_gradient(aesthetics = "stroke.colour", guide = "none") g + geom_text_contour(aes(z = value), rotate = FALSE) g + geom_text_contour(aes(z = value), label.placer = label_placer_random()) g + geom_text_contour(aes(z = value), label.placer = label_placer_n(3)) g + geom_text_contour(aes(z = value), label.placer = label_placer_flattest()) g + geom_text_contour(aes(z = value), label.placer = label_placer_flattest(ref_angle = 90))