Does a plot use one or more geoms?

use_geoms tests whether a plot uses one or more geoms created using a geom. If checking for a layer that is created using a stat function, please use uses_stats instead.

Usage

uses_geoms(p, geoms, stats = NULL, exact = TRUE)

Arguments

p

A ggplot object

geoms

A vector of character strings. Each element should correspond to the suffix of a ggplot2 geom_ function, e.g. c("point", "line", "smooth").

stats

A character vector to optionally check for the stats corresponding to geoms e.g. c("identity", "smooth") if checking c("point", "smooth")

exact

A boolean to indicate whether to use exact matching

Value

TRUE or FALSE

Details

By default, the plot must have the exact geoms or geom/stat combinations and in the same order. However, if exact is set to FALSE, the plot geoms or geom/stat combinations do not have to be exact.

See also

Other functions for checking geoms: get_geoms_stats(), get_geoms(), ith_geom_is(), ith_geom_stat(), ith_geom()

Examples

require(ggplot2)
p <- ggplot(data = mpg, mapping = aes(x = displ, y = hwy)) +
  geom_point(mapping = aes(color = class)) +
  geom_smooth()
uses_geoms(p, geoms = "point")
#> [1] FALSE
uses_geoms(p, geoms = c("point", "smooth"), exact = TRUE)
#> [1] TRUE
uses_geoms(p, geoms = c("point", "smooth"), stats = c("identity", "smooth"))
#> [1] TRUE