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Blending and compositing for ggplot2

Source: R/ggblend-package.R
ggblend-package.Rd

ggblend is an R package that adds support for R 4.2 blend modes (e.g. "multiply", "overlay", etc) to ggplot2.

Details

The primary support for blending is provided by the blend() function, which can be used to augment ggplot() layers/geoms or lists of layers/geoms in a ggplot() specification.

For example, one can replace something like this:

df |>
  ggplot(aes(x, y)) +
  geom_X(...) +
  geom_Y(...) +
  geom_Z(...)

With something like this:

df |>
  ggplot(aes(x, y)) +
  geom_X(...) +
  geom_Y(...) |> blend("multiply") +
  geom_Z(...)

In order to apply a "multiply" blend to the layer with geom_Y(...).

Package options

The following global options can be set using options() to modify the behavior of ggblend:

  • "ggblend.check_blend": If TRUE (default), blend() will warn if you attempt to use a blend mode not supported by the current graphics device, as reported by dev.capabilities()$compositing. Since this check can be unreliable on some devices (they will report not support a blend mode that they do support), you can disable this warning by setting this option to FALSE.

  • "ggblend.check_affine_transform": If TRUE (default), affine_transform() will warn if you attempt to use a blend mode not supported by the current graphics device, as reported by dev.capabilities()$transformation. Since this check can be unreliable on some devices (they will report not support a blend mode that they do support), you can disable this warning by setting this option to FALSE.