Pixel Filters for 'ggplot2' and 'grid'

Provides a range of filters that can be applied to layers from the 'ggplot2' package and its extensions, along with other graphic elements such as guides and theme elements. The filters are applied at render time and thus uses the exact pixel dimensions needed.

ggfx

ggfx is a (currently experimantal) package that allows the use of various filters and shaders on ggplot2 layers.

Installation

You can install ggfx from CRAN in the usual manner (install.packages('ggfx')) or you can grab the development version directly from github using the devtools package:

# install.packages('devtools')
devtools::install_github('thomasp85/ggfx')

Example

The basic API of ggfx is to provide a range of with_*() modifier functions instead of special versions of common geoms. This means that ggfx will work with any geom from ggplot2 and the extension packages (I think…). An example showing some of the different functionalities are given below. Note that the output is produced with regular geoms.

library(ggplot2)
library(ggfx)
ggplot() +
  as_reference(
    geom_polygon(aes(c(0, 1, 1), c(0, 0, 1)), colour = NA, fill = 'magenta'),
    id = "displace_map"
  ) +
  with_displacement(
    geom_text(aes(0.5, 0.5, label = 'ggfx-ggfx'), size = 25, fontface = 'bold'),
    x_map = ch_red("displace_map"),
    y_map = ch_blue("displace_map"),
    x_scale = unit(0.025, 'npc'),
    id = "text"
  ) +
  with_blend(
    geom_density_2d_filled(aes(rnorm(1e4, 0.5, 0.2), rnorm(1e4, 0.5, 0.2)),
                           show.legend = FALSE),
    bg_layer = "text",
    blend_type = "in",
    id = "blended"
  ) +
  with_shadow("blended", sigma = 3) +
  coord_cartesian(xlim = c(0, 1), ylim = c(0, 1), clip = 'off') +
  labs(x = NULL, y = NULL)