geom_daynight {ggdaynight}

Add Day/Night Pattern to ggplot

Description

Adds a day/night pattern to a ggplot object. Daytime is represented by rectangles filled with the specified 'day_fill' color and nighttime by rectangles filled with the specified 'night_fill' color. The pattern is created along the x-axis, which must be a datetime variable.

Usage

geom_daynight(
  mapping = NULL,
  data = NULL,
  stat = "identity",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  day_fill = "white",
  night_fill = "grey30",
  sunrise = 6,
  sunset = 18,
  ...
)

Arguments

mapping

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 mapping.

data

The data to be displayed in this layer. There are three options:

If NULL, the default, the data is inherited from the plot data as specified in the call to ggplot().

A 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.

A function will be called with a single argument, the plot data. The return value must be a data.frame, and will be used as the layer data. A function can be created from a formula (e.g. ~ head(.x, 10)).

stat

The statistical transformation to use on the data for this layer. When using a ⁠geom_*()⁠ function to construct a layer, the stat argument can be used the override the default coupling between geoms and stats. The stat argument accepts the following:

• A Stat ggproto subclass, for example StatCount.

• A string naming the stat. To give the stat as a string, strip the function name of the stat_ prefix. For example, to use stat_count(), give the stat as "count".

• For more information and other ways to specify the stat, see the layer stat documentation.

position

A position adjustment to use on the data for this layer. This can be used in various ways, including to prevent overplotting and improving the display. The position argument accepts the following:

• The result of calling a position function, such as position_jitter(). This method allows for passing extra arguments to the position.

• A string naming the position adjustment. To give the position as a string, strip the function name of the position_ prefix. For example, to use position_jitter(), give the position as "jitter".

• For more information and other ways to specify the position, see the layer position documentation.

na.rm

If FALSE, the default, missing values are removed with a warning. If TRUE, missing values are silently removed.

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. It can also be a named logical vector to finely select the aesthetics to display.

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().

day_fill

The fill color for daytime rectangles. Defaults to "white".

night_fill

The fill color for nighttime rectangles. Defaults to "grey30".

sunrise

The hour at which daytime starts. Defaults to 6 (6 AM).

sunset

The hour at which nighttime starts. Defaults to 18 (6 PM).

...

Additional arguments passed to 'geom_rect'.

Value

A ggplot2 layer representing the day/night pattern.

Examples

# Basic usage with default parameters
library(ggplot2)
ggplot(daynight_temperature, aes(datetime, temperature)) +
  geom_daynight() +
  geom_point()

# Basic usage with faceting by sensor
ggplot(daynight_temperature, aes(datetime, temperature)) +
  geom_daynight() +
  geom_point() +
  facet_wrap(vars(sensor))

# Usage with lines and color by sensor
ggplot(daynight_temperature, aes(datetime, temperature, color = sensor)) +
  geom_daynight() +
  geom_line()

# Custom day and night fill colors, custom sunrise and sunset times, and adjusted alpha
ggplot(daynight_temperature, aes(datetime, temperature, color = sensor)) +
  geom_daynight(
    day_fill = "yellow", night_fill = "blue",
    sunrise = 5, sunset = 20, alpha = 0.5
  ) +
  geom_line(linewidth = 1)