Add time series event markers to a time series plot.

The x axis must be a date.

Usage

geom_events(
  events = i_events,
  event_label_size = 7,
  event_label_colour = "black",
  event_label_angle = -30,
  event_line_colour = "grey50",
  event_fill_colour = "grey50",
  hide_labels = FALSE,
  guide_axis = ggplot2::derive(),
  x_axis_style = c("date", "time_period"),
  ...
)

Arguments

events

Significant events or time spans - a dataframe with columns:

label (character) - the event label
start (date) - the start date, or the date of the event
end (date) - the end date or NA if a single event

Any grouping allowed.

A default value is defined.

event_label_size

how big to make the event label

event_label_colour

the event label colour

event_label_angle

the event label colour

event_line_colour

the event line colour

event_fill_colour

the event area fill

hide_labels

do not show labels at all

guide_axis

a guide axis configuration for the labels (see ggplot2::guide_axis and ggplot2::dup_axis). This can be used to specify a position amongst other things.

x_axis_style

should the x-axis be "date" or a count of "time_period"s since a start date (may be specified in ... or defaults from data)

...

Named arguments passed on to ggplot2::scale_x_date

name

The name of the scale. Used as the axis or legend title. If waiver(), the default, the name of the scale is taken from the first mapping used for that aesthetic. If NULL, the legend title will be omitted.

breaks

One of:

NULL for no breaks
waiver() for the breaks specified by date_breaks
A Date/POSIXct vector giving positions of breaks
A function that takes the limits as input and returns breaks as output

date_breaks

A string giving the distance between breaks like "2 weeks", or "10 years". If both breaks and date_breaks are specified, date_breaks wins. Valid specifications are 'sec', 'min', 'hour', 'day', 'week', 'month' or 'year', optionally followed by 's'.

labels

One of the options below. Please note that when labels is a vector, it is highly recommended to also set the breaks argument as a vector to protect against unintended mismatches.

NULL for no labels
waiver() for the default labels computed by the transformation object
A character vector giving labels (must be same length as breaks)
An expression vector (must be the same length as breaks). See ?plotmath for details.
A function that takes the breaks as input and returns labels as output. Also accepts rlang lambda function notation.

date_labels

A string giving the formatting specification for the labels. Codes are defined in strftime(). If both labels and date_labels are specified, date_labels wins.

minor_breaks

One of:

NULL for no breaks
waiver() for the breaks specified by date_minor_breaks
A Date/POSIXct vector giving positions of minor breaks
A function that takes the limits as input and returns minor breaks as output

date_minor_breaks

A string giving the distance between minor breaks like "2 weeks", or "10 years". If both minor_breaks and date_minor_breaks are specified, date_minor_breaks wins. Valid specifications are 'sec', 'min', 'hour', 'day', 'week', 'month' or 'year', optionally followed by 's'.

limits

One of:

NULL to use the default scale range
A numeric vector of length two providing limits of the scale. Use NA to refer to the existing minimum or maximum
A function that accepts the existing (automatic) limits and returns new limits. Also accepts rlang lambda function notation. Note that setting limits on positional scales will remove data outside of the limits. If the purpose is to zoom, use the limit argument in the coordinate system (see coord_cartesian()).

expand

For position scales, a vector of range expansion constants used to add some padding around the data to ensure that they are placed some distance away from the axes. Use the convenience function expansion() to generate the values for the expand argument. The defaults are to expand the scale by 5% on each side for continuous variables, and by 0.6 units on each side for discrete variables.

oob

One of:

Function that handles limits outside of the scale limits (out of bounds). Also accepts rlang lambda function notation.
The default (scales::censor()) replaces out of bounds values with NA.
scales::squish() for squishing out of bounds values into range.
scales::squish_infinite() for squishing infinite values into range.

guide

A function used to create a guide or its name. See guides() for more information.

position

For position scales, The position of the axis. left or right for y axes, top or bottom for x axes.

timezone

The timezone to use for display on the axes. The default (NULL) uses the timezone encoded in the data.

na.value

Missing values will be replaced with this value.

Named arguments passed on to as.time_period

unit: the length of one unit of time. This will be either a integer number of days, or a specification such as "1 week", or another time_period. If x is a time_period, and the unit is different to that of x this will return a rescaled time_period using the new units.
start_date: the zero time date as something that can be coerced to a date. If the x input is already a time_period and this is different to its start_date then x will be recalibrated to use the new start date.
anchor: only relevant if x is a vector of dates, this is a date, or "start" or "end" or a weekday name e.g. "mon". With the vector of dates in x it will use this anchor to find a reference date for the time-series. If not provided then the current defaults will be used. (see set_defaults())

Value

a set of geoms for a time series.