A layer is a combination of data, stat and geom with a potential position
adjustment. Usually layers are created using geom_*
or stat_*
calls but it can also be created directly using this function.
layer(geom = NULL, stat = NULL, data = NULL, mapping = NULL, position = NULL, params = list(), inherit.aes = TRUE, check.aes = TRUE, check.param = TRUE, show.legend = NA, key_glyph = NULL, layer_class = Layer)
geom | The geometric object to use display the data |
---|---|
stat | The statistical transformation to use on the data for this layer, as a string. |
data | The data to be displayed in this layer. There are three options: If A A |
mapping | Set of aesthetic mappings created by |
position | Position adjustment, either as a string, or the result of a call to a position adjustment function. |
params | Additional parameters to the |
inherit.aes | If |
check.aes, check.param | If |
show.legend | logical. Should this layer be included in the legends?
|
key_glyph | A legend key drawing function or a string providing the
function name minus the |
layer_class | The type of layer object to be constructued. This is intended for ggplot2 internal use only. |
# shortcut for ggplot(mpg, aes(displ, hwy)) + layer(geom = "point", stat = "identity", position = "identity", params = list(na.rm = FALSE) )# use a function as data to plot a subset of global data ggplot(mpg, aes(displ, hwy)) + layer(geom = "point", stat = "identity", position = "identity", data = head, params = list(na.rm = FALSE) )