Pattern Plasma - Parameters and Examples

suppressPackageStartupMessages({
  library(ggplot2)
  library(ggpattern)
})

plasma - Filling with noise

Array-based patterns allow the user to specify an RGBA that should be displayed in the geom.

Imagemagick (magick) has the ability to generate some fractal noise arrays, and for this pattern, these arrays are coloured and used to fill the geom.

plasma options

Aesthetic	Description	Default
pattern_fill	Noise colour	‘grey80’
pattern_scale	Extra scaling	1
pattern_alpha	Alpha	NA
pattern_aspect_ratio	Override aspect ratio	NA
pattern_key_scale_factor	Additional scale factor for legend	1

Example Data

df1 <- data.frame(
  trt     = c("a", "b", "c"), 
  outcome = c(2.3, 1.9, 3.2)
)

Example: pattern = 'plasma' - With pattern_alpha

ggplot(df1, aes(trt, outcome)) +
  geom_col_pattern(
    aes(
      fill         = trt,
      pattern_fill = trt
    ),
    fill          = NA,
    pattern       = 'plasma',
    pattern_alpha = 1,
    pattern_scale = 2,
    colour        = 'black'
  ) +
  theme_bw(15) +
  labs(
    title    = "ggpattern::geom_col_pattern()",
    subtitle = "pattern='plasma'"
  ) +
  theme(legend.key.size = unit(1.5, 'cm')) +
  coord_fixed(ratio = 1/2)

Example: pattern = 'plasma' - With pattern_alpha

ggplot(mtcars) +
  geom_density_pattern(
    aes(
      x             = mpg,
      pattern_fill  = as.factor(cyl)
    ),
    pattern      = 'plasma',
    pattern_alpha = 0.7
  ) +
  theme_bw(15) +
  theme(legend.position = 'none') +
  labs(
    title    = "ggpattern::geom_density_pattern()",
    subtitle = "pattern='plasma'"
  ) +
  coord_fixed(ratio = 80)