FA-97639 / Knitting and sewing pattern grading / Member archive

Buttonhole row planner: one-based rows · case 04

The first buttonhole is placed one row too low.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Buttonholes run from bottom_offset to band_len - top_offset (cm), evenly spaced; a single buttonhole goes at the top position. Convert each position to a 1-based row: half-up of position*rows_per_10cm/10, plus 1. n < 1 -> "error: count"; top position below bottom -> "error: offsets".

Why this case matters

Cardigan button bands place buttonholes evenly between neck and hem offsets.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
five buttons	`[6, 41, 76, 111, 146]`	`[7, 42, 77, 112, 147]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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