Overlays

Optional skyplothelper-backed compass, beam, and scale-bar helpers (pip install multicolorfits[overlays]).

overlays_available

True when the optional skyplothelper overlays extra is installed.

add_compass	Add a WCS-aware north/east compass (delegates to skyplothelper).
add_beam	Add a FITS-beam marker from BMAJ / BMIN / BPA in header.
add_scale_bar	Add an arcsecond scale bar (delegates to skyplothelper add_sizebar_asec).
apply_overlays	Apply selected skyplothelper overlays to an existing axes.
apply_compose_overlays	Apply overlay toggles from a ComposeState.
offset_coord_wcs	Build a locally linear offset WCS centred on center (skyplothelper).
make_offset_figure	One-call offset field figure (delegates to skyplothelper offset_figure).
require_overlays	Import and return the skyplothelper module.