arc — ANNOTATE shape op

• Data kinds: image2d → image2d

• Call: import annotate; annotate.arc(img, center, radius, start_deg, end_deg, color='neutral', width=2, alpha=1.0, scheme='okabe_ito') (or opsannotate.get("arc"))

Usage

A circular arc. Angles are in degrees, clockwise from the screen x-axis (because row points down).

> The detailed description below is the original text — the summary and the headings are translated.

Raises

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ValueError

radius が非正、角度が非有限、start == end、alpha が [0,1] の外。

Detailed usage guide

• figure_annotation family guide

Background guides (the physics and conventions behind this op)

• dataset_conventions — 学習データセット規約の知識 — COCO / YOLO / VOC と外観検査での落とし穴

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

• The canonical algorithm (author, year) and its uses are named in the family usage guide above.

Runnable examples (verified samples that actually call this op)

• annotate_gallery — py -3.11 examples/annotate_gallery.py

Ops the type connects to (they accept image2d as input)

text_box · arrow · leader_line · label_points · crosshair · legend_box · color_bar · scale_bar

Same category (shape)

rounded_rect · filled_polygon · ellipse

*Provenance: annotate.py — ANNOTATE operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.