annotate_angle_layout — ANNOTATE paper op

• Data kinds: none → table (an op determined by its arguments alone — it takes no image or data input)

• Call: import fullseye as fs; fs.ledger.annotate_angle_layout(a, vertex, b, radius=30.0, text_gap=12.0) (to call the implementation directly, import annotate; annotate.annotate_angle_layout(a, vertex, b, radius=30.0, text_gap=12.0); from the registry, opsannotate.get("annotate_angle_layout"))

Usage

Returns a table (dict): the arc and text position for the (smaller) angle at a, vertex, b.

Angles come from atan2 in screen coordinates (x right, y down), so start_deg/end_deg are degrees "clockwise from the x axis", the same as arc.

Returns

dict

{"vertex","angle_deg","start_deg","end_deg","radius","text_xy", "bisector_deg"}.

Raises

ValueError

a or b coincides with vertex, non-finite values, or radius is not positive.

Detailed usage guide

• figure_annotation family guide

Background guides (the physics and conventions behind this op)

• dataset_conventions — Training-dataset conventions — COCO / YOLO / VOC and pitfalls in visual inspection

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)

• paper_figure — py -3.11 examples/paper_figure.py

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

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Same category (paper)

annotate_leader_layout · annotate_leader · annotate_markers · annotate_legend · annotate_dimension_layout · annotate_dimension · annotate_angle · annotate_scale_bar_layout

*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.