cograph (version 1.5.2)

draw_curved_edge_base: Draw Curved Edge with xspline (qgraph-style)

Description

Renders a curved edge using xspline() with optional arrow. Uses qgraph-style curve calculation for smooth, natural-looking curves. Curve direction is normalized so positive curve always bends the same visual direction regardless of edge orientation.

Usage

draw_curved_edge_base(
  x1,
  y1,
  x2,
  y2,
  curve = 0.2,
  curvePivot = 0.5,
  col = "gray50",
  lwd = 1,
  lty = 1,
  arrow = TRUE,
  asize = 0.02,
  bidirectional = FALSE,
  start_lty = 1,
  start_fraction = 0,
  arrow_angle = pi/6
)

Arguments

x1, y1

Start point coordinates.

x2, y2

End point coordinates.

curve

Curvature amount (positive = clockwise, negative = counterclockwise when looking from source to target).

curvePivot

Position along edge for control point (0-1).

col

Edge color.

lwd

Line width.

lty

Line type.

arrow

Logical: draw arrow at target?

asize

Arrow size.

bidirectional

Logical: draw arrow at source too?

start_lty

Line type for start segment. 1=solid (default), 2=dashed, 3=dotted.

start_fraction

Fraction of edge length for start segment (0-0.5). Default 0.

arrow_angle

Arrow head angle in radians. Default pi/6 (30 degrees).