FA-5862 / Planar geometry / Member archive

Reflection across vertical line · case 02

The reflection axis is forced to x equals zero.

Member previewVariant 2 · 3 implementations · 4 checks per implementation

Case contract

Integer coordinates and lengths, with exact arithmetic except for indicated division results. Lengths are nonnegative. Rectangles are (xmin,ymin,xmax,ymax) with ordered bounds; coordinate vectors have matching dimensions. Reflection across vertical line. Exact operational definition: (2*x-point[0],point[1])

Why this case matters

Small exact fixtures expose this error without platform timing, external services, or probabilistic observations. Planar geometry results depend on the stated convention.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fixture 1: ((2, 3), 1)	`[-2, 3]`	`[0, 3]`	Failed

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

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