coord_brain: Keep brain shapes undistorted

In ggseg: Plotting Tool for Brain Atlases

Keep brain shapes undistorted

Description

Fixes the aspect ratio so brains aren't stretched by the shape of the plotting window. [geom_brain()] adds 'coord_brain()' for you, so you rarely need to call it yourself – reach for it only to adjust the 'ratio' or 'clip' behaviour. You can safely add your own coord or stack several 'geom_brain()' layers; it steps aside cleanly.

Usage

coord_brain(ratio = 1, clip = "off", ...)

Arguments

ratio	Aspect ratio, expressed as 'y / x'. Defaults to '1', which keeps brain polygons undistorted.
clip	Should drawing be clipped to the panel extent ('"on"') or allowed to overflow ('"off"')? Defaults to '"off"' so region outlines at the panel edge are not cut.
...	Additional arguments passed to [ggplot2::coord_fixed()].

Value

A ggplot2 coordinate system that registers as a default.

Examples

library(ggplot2)
## Not run: 
poly <- ggseg.formats::as_polygon_atlas(dk())
# Equivalent to the default; shown explicitly:
ggplot() +
  geom_brain(atlas = poly) +
  coord_brain()

## End(Not run)

ggseg documentation built on June 22, 2026, 9:09 a.m.