eulerr (version 8.1.0)

build_leader_grob: Build the polyline leader for an exterior tag, or grid::nullGrob() for interior / missing-tether placements.

Description

Draws the polyline tether → waypoints[1..] → leader_end. For straight leaders (raycast / force-directed) waypoints_* are empty, so the polyline collapses to the single tether → leader_end segment. For elbow leaders eunoia emits one knee waypoint, producing the orthogonal tether → knee → leader_end bend.

Usage

build_leader_grob(
  ax,
  ay,
  kind,
  tx,
  ty,
  lend_x,
  lend_y,
  waypoints_x = numeric(0),
  waypoints_y = numeric(0),
  leader_gp_list,
  fallback_gp,
  name
)

Details

Terminates at (lend_x, lend_y) — the point on the label box AABB edge supplied by eunoia (LabelPlacement::leader_end). Falls back to the anchor when the leader endpoint isn't finite so older / partial placement results still draw something sensible.