Add a GPU Text / Symbol Label Layer (add_labels)

Renders crisp halo-outlined text labels anchored to sf points, polygon centroids, or data.frame coordinates.

Usage

add_labels(
  map,
  data = NULL,
  text,
  lon = NULL,
  lat = NULL,
  size = 12,
  color = "#f8fafc",
  halo_color = "#0f172a",
  id = NULL,
  group = NULL
)

Arguments

map: A glmap widget or glmap_proxy.
data: An sf, sfc, or data.frame object.
text: Formula (~name), column name string, or character vector of label texts.
lon: Optional longitude column name or formula (~lon).
lat: Optional latitude column name or formula (~lat).
size: Font size in pixels (default 12).
color: Text color (default "#f8fafc").
halo_color: Halo outline color for contrast (default "#0f172a").
id: Layer ID.
group: Layer group name.