FA-97613 / Knitting and sewing pattern grading / Member archive

Quilt binding strip planner: strip count loop · case 03

An exact fit plans one more strip than needed.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Usable strip length = fabric_width - 2*selvage. Joining n strips with diagonal seams loses strip_width per join (n-1 joins). Need perimeter + tail. n is the smallest count with n*usable - (n-1)*strip_width >= need. Return [n, fabric cut length n*strip_width, surplus]; usable <= strip_width -> "error: fabric too narrow".

Why this case matters

Quilters cut width-of-fabric strips and join them diagonally to bind the quilt edge.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: strip count loop	`[4, 20, 145]`	`[3, 15, 0]`	Failed

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