FA-97579 / Knitting and sewing pattern grading / Member archive

Cutting layout fabric length: layout sort order · case 04

Short pieces open rows that tall pieces then extend, wasting fabric.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Pieces [w, h, qty] (cm; w across the fabric). A piece wider than the fabric is rotated if the fabric is not directional and its height fits, else "error: piece too wide". Expand qty, sort by (height, width) descending, then shelf-pack: start a new row when the row width plus the piece would exceed the fabric width; each row is as tall as its tallest piece. Return [length_cm, eighths_of_a_yard] with eighths = ceiling(length/91.44*8).

Why this case matters

Pattern envelopes and cutting planners estimate yardage from piece layouts and nap direction.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: layout sort order	`[195, 18]`	`[180, 16]`	Failed

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