Compose guides on top of one another

This guide can place place other guides on top of one another.

Usage

compose_ontop(
  ...,
  args = list(),
  key = NULL,
  title = waiver(),
  angle = waiver(),
  theme = NULL,
  order = 0,
  position = waiver(),
  available_aes = NULL
)

Arguments

...

Guides to stack in composition. Each guide can be specified as one of the following:

• A <Guide> class object.

• A <function> that returns a <Guide> class object.

• A <character[1]> naming such a function, without the guide_ or primitive_ prefix.

args

A <list> of arguments to pass to guides that are given either as a function or as a string.

key

A standard key specification. The key is shared among all guides that have NULL keys themselves. See more information in the linked topic.

title

A <character[1]> or <expression[1]> indicating the title of the guide. If NULL, the title is not shown. The default, waiver(), takes the name of the scale object or the name specified in labs() as the title.

angle

A specification for the text angle. Compared to setting the angle argument in element_text(), this argument uses some heuristics to automatically pick the hjust and vjust that you probably want. Can be one of the following:

• NULL to take angles and justification settings directly from the theme.

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

• A <numeric[1]> between -360 and 360 for the text angle in degrees.

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.

order

A positive <integer[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 hashing indicative settings of a guide.

position

A <character[1]> giving the location of the guide. Can be one of "top", "bottom", "left" or "right".

available_aes

A <character> giving aesthetics that must match the the guides.

Value

A <ComposeOntop> composite guide object.

See also

Other composition: compose_crux(), compose_sandwich(), compose_stack(), guide-composition

Examples

# Using the ontop composition to get two types of ticks with different
# lengths
ggplot(mpg, aes(displ, hwy)) +
  geom_point() +
  guides(x = compose_ontop(
    guide_axis_custom(
      key_manual(c(2, 4, 6)),
      theme = theme(
        axis.ticks = element_line(colour = "limegreen"),
        axis.ticks.length = unit(11, "pt")
      )
    ),
    guide_axis_custom(
      key_manual(c(3, 5, 7)),
      theme = theme(
        axis.ticks = element_line(colour = "tomato"),
        axis.ticks.length = unit(5.5, "pt")
      )
    )
  ))