E01 · F01 · EN-007 — Path data with arcs

Write segments and circular arcs as path data with A commands (radius, flags, end point).

Acceptance criteria

Sources: REF-SVG2-PATHS §9.3.8–9.3.9, REF-SVG2-IMPLNOTE B.2.1, DERIV-fillet-arc steps 4–5 (SP-001).

• Given an arc of radius 10 in the positive direction ending at (100, 10), when written, then the command is A10 10 0 0 1 100 10 (no rotation, small arc, sweep 1).
• Given an arc in the negative direction, when written, then its sweep flag is 0.
• Given the 100 × 50 rectangle with radius 10, when written, then the path data is M10 0 L90 0 A10 10 0 0 1 100 10 L100 40 A10 10 0 0 1 90 50 L10 50 A10 10 0 0 1 0 40 L0 10 A10 10 0 0 1 10 0 Z.
• Given the 100 × 100 square with radius 50, when written, then the path data is M50 0 A50 50 0 0 1 100 50 A50 50 0 0 1 50 100 A50 50 0 0 1 0 50 A50 50 0 0 1 50 0 Z and every number follows EN-001.

Tasks

One task = one commit, referenced as EN-007.Tn.

• T1 — Coordinate pair as a shared format function (out of contourToPathData), and the arc command A (REF-SVG2-PATHS §9.3.8) with its tests (1 h)
• T2 — Path data of a closed sequence of segments and arcs (format) with the cases above (2 h)