Legend helper for geom_pop/geom_icon_point legends

A convenience function to set appropriate legend key sizes for icon-based legends. This is equivalent to using theme(legend.key.size = ...) but provides sensible defaults for population icon plots.

Usage

scale_legend_icon(
  size = 10,
  unit = "mm",
  spacing = 0.2,
  size_multiplier = 2,
  ...
)

Arguments

size

Numeric. Legend key size in specified units (default 10).

unit

Character. Unit for legend key sizing (default "mm").

spacing

Numeric. Spacing between legend items as fraction of size (default 0.2).

size_multiplier

Numeric. Multiplier to apply to the size for spacing calculations (default 2).

...

Additional theme arguments.

Value

A ggplot2 theme object that can be added to a plot.

Examples

# \donttest{
library(ggplot2)
df <- data.frame(
  type = rep(c("A", "B"), each = 10),
  icon = rep(c("circle", "square"), each = 10)
)
ggplot(df, aes(icon = icon, color = type)) +
  geom_pop() +
  scale_legend_icon(size = 20)

# }