mark_rule: Add a rule (reference line) mark

In glyph: A Grammar of Interactive Graphics

Add a rule (reference line) mark

Description

Add a rule (reference line) mark

Usage

mark_rule(
  spec,
  ...,
  data = NULL,
  style = list(),
  x_intercept = NULL,
  y_intercept = NULL
)

Arguments

spec	A glyph_spec
...	Aesthetic mappings (x, y, color, size, shape, alpha, tooltip)
data	Optional per-mark data override
style	Named list of fixed visual properties
x_intercept	Fixed x position for vertical rule
y_intercept	Fixed y position for horizontal rule

Value

Modified glyph_spec object with the rule mark added

glyph documentation built on Oct. 21, 2026, 5:12 p.m.