build_tag_grobs: Build the leader / label / quantity / annotation gList for...

In eulerr: Area-Proportional Euler and Venn Diagrams

Build the leader / label / quantity / annotation gList for one tag.

Description

Shared between setup_tag() (initial construction in setup_grobs()) and makeContent.EulerTags() (draw-time re-placement on resize). Pure factory — no measurement; takes anchor + tether already in native units, plus the stashed text / gpar bundle. The label / quantity / annotation stack is centered vertically on ⁠(ax, ay)⁠ so the bbox center matches the anchor eunoia placed and leader endpoints land on the actual bbox edge.

Usage

build_tag_grobs(
  ax,
  ay,
  kind,
  tx,
  ty,
  lend_x,
  lend_y,
  label_text,
  quantity_text,
  annotation_text,
  has_label,
  has_quantity,
  has_annotation,
  label_gp,
  quantity_gp,
  annotation_gp,
  label_rot,
  quantity_rot,
  annotation_rot,
  number,
  leader_gp_list,
  padding,
  waypoints_x = numeric(0),
  waypoints_y = numeric(0),
  name_prefix = "tag"
)

Arguments

ax, ay	the tag anchor, in native units
kind	the placement kind eunoia returned (interior, exterior, ...)
tx, ty	the tether point on the shape, in native units
lend_x, lend_y	the leader endpoint on the tag bbox, in native units
label_text, quantity_text, annotation_text	the three text components
has_label, has_quantity, has_annotation	whether each component is drawn
label_gp, quantity_gp, annotation_gp	per-component grid::gpar()
label_rot, quantity_rot, annotation_rot	per-component rotation, in degrees
number	the diagram's region index, used to name the grobs
leader_gp_list	grid::gpar() for the leader line, or NULL for no leader
padding	vertical separation between components, as a grid::unit()
waypoints_x, waypoints_y	intermediate leader vertices, in native units
name_prefix	prefix for the generated grob names

eulerr documentation built on Aug. 22, 2026, 1:09 a.m.