guide_axis_theta {ggplot2}

Angle axis guide

Description

This is a specialised guide used in coord_radial() to represent the theta position scale.

Usage

guide_axis_theta(
  title = waiver(),
  theme = NULL,
  angle = waiver(),
  minor.ticks = FALSE,
  cap = "none",
  order = 0,
  position = waiver()
)

Arguments

title

A character string or expression indicating a title of guide. If NULL, the title is not shown. By default (waiver()), the name of the scale object or the name specified in labs() is used for the title.

theme

A theme object to style the guide individually or differently from the plot's theme settings. The theme argument in the guide overrides, and is combined with, the plot's theme.

angle

Compared to setting the angle in theme() / element_text(), this also uses some heuristics to automatically pick the hjust and vjust that you probably want. Can be one of the following:

• NULL to take the angles and hjust/vjust directly from the theme.

• waiver() to allow reasonable defaults in special cases.

• A number representing the text angle in degrees.

minor.ticks

Whether to draw the minor ticks (TRUE) or not draw minor ticks (FALSE, default).

cap

A character to cut the axis line back to the last breaks. Can be "none" (default) to draw the axis line along the whole panel, or "upper" and "lower" to draw the axis to the upper or lower break, or "both" to only draw the line in between the most extreme breaks. TRUE and FALSE are shorthand for "both" and "none" respectively.

order

A positive integer of length 1 that specifies the order of this guide among multiple guides. This controls in which order guides are merged if there are multiple guides for the same position. If 0 (default), the order is determined by a secret algorithm.

position

Where this guide should be drawn: one of top, bottom, left, or right.

Note

The axis labels in this guide are insensitive to hjust and vjust settings. The distance from the tick marks to the labels is determined by the largest margin size set in the theme.

Examples

# A plot using coord_radial
p <- ggplot(mtcars, aes(disp, mpg)) +
  geom_point() +
  coord_radial()

# The `angle` argument can be used to set relative angles
p + guides(theta = guide_axis_theta(angle = 0))