ggrepel (version 0.7.0)

geom_label_repel: Repulsive textual annotations.

Description

geom_text_repel adds text directly to the plot. geom_label_repel draws a rectangle underneath the text, making it easier to read. The text labels repel away from each other and away from the data points.

Usage

geom_label_repel(mapping = NULL, data = NULL, stat = "identity",
  parse = FALSE, ..., box.padding = 0.25, label.padding = 0.25,
  point.padding = 1e-06, label.r = 0.15, label.size = 0.25,
  segment.colour = NULL, segment.color = NULL, segment.size = 0.5,
  segment.alpha = NULL, min.segment.length = 0.5, arrow = NULL,
  force = 1, max.iter = 2000, nudge_x = 0, nudge_y = 0, xlim = c(NA,
  NA), ylim = c(NA, NA), na.rm = FALSE, show.legend = NA,
  direction = c("both", "y", "x"), seed = NA, inherit.aes = TRUE)
geom_text_repel(mapping = NULL, data = NULL, stat = "identity",
  parse = FALSE, ..., box.padding = 0.25, point.padding = 1e-06,
  segment.colour = NULL, segment.color = NULL, segment.size = 0.5,
  segment.alpha = NULL, min.segment.length = 0.5, arrow = NULL,
  force = 1, max.iter = 2000, nudge_x = 0, nudge_y = 0, xlim = c(NA,
  NA), ylim = c(NA, NA), na.rm = FALSE, show.legend = NA,
  direction = c("both", "y", "x"), seed = NA, inherit.aes = TRUE)

Arguments

mapping

Set of aesthetic mappings created by aes or aes_. If specified and inherit.aes = TRUE (the default), is combined with the default mapping at the top level of the plot. You only need to supply mapping if there isn't a mapping defined for the plot.

data

A data frame. If specified, overrides the default data frame defined at the top level of the plot.

stat

The statistical transformation to use on the data for this layer, as a string.

parse

If TRUE, the labels will be parsed into expressions and displayed as described in ?plotmath

...

other arguments passed on to layer. There are three types of arguments you can use here:

• Aesthetics: to set an aesthetic to a fixed value, like colour = "red" or size = 3.

• Other arguments to the layer, for example you override the default stat associated with the layer.

• Other arguments passed on to the stat.

box.padding

Amount of padding around bounding box, as unit or number. Defaults to 0.25. (Default unit is lines, but other units can be specified by passing unit(x, "units")).

label.padding

Amount of padding around label, as unit or number. Defaults to 0.25. (Default unit is lines, but other units can be specified by passing unit(x, "units")).

point.padding

Amount of padding around labeled point, as unit or number. Defaults to 0. (Default unit is lines, but other units can be specified by passing unit(x, "units")).

label.r

Radius of rounded corners, as unit or number. Defaults to 0.15. (Default unit is lines, but other units can be specified by passing unit(x, "units")).

label.size

Size of label border, in mm.

segment.colour, segment.color

Colour of the line segment. Defaults to the same colour as the text. In the unlikely event you specify both US and UK spellings of colour, the US spelling will take precedence.

segment.size

Width of line segment connecting the data point to the text label, in mm.

segment.alpha

Transparency of the line segment. Defaults to the same transparency as the text.

min.segment.length

Skip drawing segments shorter than this, as unit or number. Defaults to 0.5. (Default unit is lines, but other units can be specified by passing unit(x, "units")).

arrow

specification for arrow heads, as created by arrow

force

Force of repulsion between overlapping text labels. Defaults to 1.

max.iter

Maximum number of iterations to try to resolve overlaps. Defaults to 2000.

nudge_x, nudge_y

Horizontal and vertical adjustments to nudge the starting position of each text label.

xlim, ylim

Limits for the x and y axes. Text labels will be constrained to these limits. By default, text labels are constrained to the entire plot area.

na.rm

If FALSE (the default), removes missing values with a warning. If TRUE silently removes missing values.

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.

direction

"both", "x", or "y" -- direction in which to adjust position of labels

seed

Random seed passed to set.seed. Defaults to NA, which means that set.seed will not be called.

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.

<code>geom_label_repel</code>

Currently geom_label_repel does not support the rot parameter and is considerably slower than geom_text_repel. The fill aesthetic controls the background colour of the label.

Alignment

The repulsive geoms reposition text labels to avoid overlap, so the following parameters are not supported:

• hjust

• vjust

• position

• check_overlap

Details

These geoms are based on geom_text and geom_label. See the documentation for those functions for more details. Differences from those functions are noted here.

Text labels have height and width, but they are physical units, not data units. The amount of space they occupy on that plot is not constant in data units: when you resize a plot, labels stay the same size, but the size of the axes changes. The text labels are repositioned after resizing a plot.

Examples

# NOT RUN {
p <- ggplot(mtcars,
  aes(wt, mpg, label = rownames(mtcars), colour = factor(cyl))) +
  geom_point()

# Avoid overlaps by repelling text labels
p + geom_text_repel()
# Labels with background
p + geom_label_repel()

# }
# NOT RUN {
p + geom_text_repel(family = "Times New Roman",
  box.padding = 0.5)

# Add aesthetic mappings
p + geom_text_repel(aes(alpha=wt, size=mpg))
p + geom_label_repel(aes(fill=factor(cyl)), colour="white", segment.colour="black")

# Draw all line segments
p + geom_text_repel(min.segment.length = 0)

# Omit short line segments (default behavior)
p + geom_text_repel(min.segment.length = 0.5)

# Omit all line segments
p + geom_text_repel(segment.colour = NA)

# Repel just the labels and totally ignore the data points
p + geom_text_repel(point.padding = NA)

# Hide some of the labels, but repel from all data points
mtcars$label <- rownames(mtcars)
mtcars$label[1:15] <- ""
p + geom_text_repel(data = mtcars, aes(wt, mpg, label = label))

# Nudge the starting positions
p + geom_text_repel(nudge_x = ifelse(mtcars$cyl == 6, 1, 0),
                    nudge_y = ifelse(mtcars$cyl == 6, 8, 0))

# Change the text size
p + geom_text_repel(aes(size = wt))
# Scale height of text, rather than sqrt(height)
p + geom_text_repel(aes(size = wt)) + scale_radius(range = c(3,6))

# You can display expressions by setting parse = TRUE.  The
# details of the display are described in ?plotmath, but note that
# geom_text_repel uses strings, not expressions.
p + geom_text_repel(aes(label = paste(wt, "^(", cyl, ")", sep = "")),
  parse = TRUE)

# Add a text annotation
p +
  geom_text_repel() +
  annotate(
    "text", label = "plot mpg vs. wt",
    x = 2, y = 15, size = 8, colour = "red"
  )

# Add arrows
p +
  geom_point(colour = "red") +
  geom_text_repel(
    arrow = arrow(length = unit(0.02, "npc")),
    box.padding = 1
  )

# }

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