FA-97528 / Knitting and sewing pattern grading / Member archive

Sewing pattern grade rule stepper: quarter panel split · case 03

Each quarter panel receives half the circumference.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Sizes 6..22 in steps of 2 (others -> "error: size"). Grading one size step between sizes s and s+2 changes the circumference by `small` cm if the lower size s < brk, else `large`. Going down subtracts the same step amounts. Return [circumference, per quarter-panel = circumference/4], both half-up to 0.1.

Why this case matters

Sewing pattern grading applies different increments above a size break and distributes them across front and back pieces.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
down across the break	`[93.0, 46.5]`	`[93.0, 23.3]`	Failed

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