ob_covariance: create double-headed arrow paths indicating variance

In ggdiagram: Object-Oriented Diagram Plots with 'ggplot2'

create double-headed arrow paths indicating variance

Description

create double-headed arrow paths indicating variance

Usage

ob_covariance(
  x,
  y,
  where = NULL,
  bend = 0,
  looseness = 1,
  arrow_head = the$arrow_head,
  length_head = 7,
  length_fins = 7,
  resect = 2,
  ...
)

Arguments

x	object
y	object
where	exit angle. Can be numeric (degrees), degree, radian, turn, or named direction (e.g., "northwest", "east", "below", "left")
bend	Angle by which the control points are rotated. Can be numeric (degrees), degree, radian, turn, or named direction (e.g., "northwest", "east", "below", "left"). Defaults to 0
looseness	distance of control points as a ratio of the distance to the object's center (e.g., in a circle of radius 1, looseness = 1.5 means that that the control points will be 1.5 units from the start and end points.)
arrow_head	A 2-column matrix of polygon points
length_head	Determines the size of the arrow head. Numeric values set the ornament size relative to the linewidth. A grid::unit value sets the ornament size in an absolute manner. From ggarrow.
length_fins	Determines the size of the arrow fins. Numeric values set the ornament size relative to the linewidth. A grid::unit value sets the ornament size in an absolute manner. From ggarrow.
resect	A numeric(1) denoting millimeters or grid::unit to shorten the arrow head and fins.
...	<dynamic-dots> properties passed to style

Value

An ob_bezier object

Examples

ggdiagram() +
  {x <- ob_circle(ob_point(c(-2, 2), 0))} +
  ob_covariance(x = x[1],
                y = x[2],
                label = ob_label("A"))

ggdiagram() +
  x +
  ob_covariance(x = x[1],
                y = x[2],
                label = ob_label("A"),
                where = -45,
                looseness = .75)

ggdiagram documentation built on Sept. 15, 2025, 1:07 a.m.