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Guide primitives: boxes

Source: R/primitive-box.R
primitive_box.Rd

This function constructs a boxes guide primitive.

Usage

primitive_box(
  key = "range_auto",
  angle = waiver(),
  oob = "squish",
  drop_zero = TRUE,
  pad_discrete = 0.4,
  min_size = NULL,
  levels_box = NULL,
  levels_text = NULL,
  theme = NULL,
  position = waiver()
)

Arguments

key

A range key specification. See more information in the linked topic.

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.

oob

A method for dealing with out-of-bounds (oob) ranges. Can be one of "squish", "censor" or "none".

drop_zero

A <logical[1]> whether to drop near-zero width ranges (TRUE, default) or preserve them (FALSE).

pad_discrete

A <numeric[1]> giving the amount ranges should be extended when given as a discrete variable. This is applied after the drop_zero setting.

min_size

A [<grid::unit[1]>][grid::unit] setting the minimal size of a box.

levels_box

A list of <element_rect> objects to customise how boxes appear at every level.

levels_text

A list of <element_text> objects to customise how text appears at every level.

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.

position

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

Value

A <PrimitiveBox> primitive guide that can be used inside other guides.

Styling options

Below are the theme options that determine the styling of this guide, which may differ depending on whether the guide is used in an axis or in a legend context.

Common to both types is the following:

  • legendry.box an <element_rect> for the boxes to draw.

As an axis guide

  • axis.text.{x/y}.{position} an <element_text> for the text inside the boxes.

As a legend guide

  • legend.text an <element_text> for the text inside the boxes.

See also

Other primitives: primitive_bracket(), primitive_fence(), primitive_labels(), primitive_line(), primitive_spacer(), primitive_ticks(), primitive_title()

Examples

# A standard plot
p <- ggplot(mpg, aes(interaction(drv, year), displ)) +
 geom_point()

key <- key_range_manual(c(2, 4), c(5, 6), c("A", "B"))

# Adding as secondary guides
p + guides(
  x.sec = primitive_box(),
  y.sec = primitive_box(key = key)
)