This filter applies the familiar drop-shadow effect on elements in a layer. It takes the outline of each shape, offsets it from its origin and applies a blur to it.
with_shadow(
x,
colour = "black",
x_offset = 10,
y_offset = 10,
sigma = 1,
stack = TRUE,
...
)Arguments
- x
A ggplot2 layer object, a ggplot, a grob, or a character string naming a filter
- colour
The colour of the shadow
- x_offset, y_offset
The offset of the shadow from the origin as numerics
- sigma
The standard deviation of the gaussian kernel. Increase it to apply more blurring. If a numeric it will be interpreted as given in pixels. If a unit object it will automatically be converted to pixels at rendering time
- stack
Should the original layer be placed on top?
- ...
Arguments to be passed on to methods. See the documentation of supported object for a description of object specific arguments.
Value
Depending on the input, either a grob, Layer, list of Layers,
guide, or element object. Assume the output can be used in the same
context as the input.
Examples
library(ggplot2)
ggplot(mtcars, aes(mpg, disp)) +
with_shadow(geom_point(colour = 'red', size = 3), sigma = 3)
