Skip to contents

Add or update curvature for a single edge

Source: R/dagify.R
curve_edge.Rd

curve_edge() sets the curvature for a single edge on a dagitty or tidy_dagitty object. Use set_curve_edges() to set multiple edges at once.

Usage

curve_edge(.dag, from, to, curvature = 0.3)

Arguments

.dag

A dagitty or tidy_dagitty object.

from

Character. The name of the source node.

to

Character. The name of the target node.

curvature

Numeric. The curvature value for the edge.

Value

The modified .dag object with updated curvature.

Curvature sign convention

The curvature value is passed directly to the active edge rendering engine. The ggraph engine (default) and ggarrow engine interpret the sign differently:

  • ggraph: positive curvature curves above (to the left of) a left-to-right edge.

  • ggarrow / grid: positive curvature curves below (to the right of) a left-to-right edge, following grid::curveGrob() convention.

This means the same curvature value will render as a mirror image depending on the engine. ggdag does not negate or transform the value; each engine uses its native convention.

Examples

dag <- dagify(y ~ x + m, m ~ x)
dag <- curve_edge(dag, from = "m", to = "y", curvature = 0.5)