Add a synthetic viewport-association fixture

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A hand-written DXF small enough to read: one layout viewport at a 1:2
paper-per-model scale, one line, circle, arc, bulged lightweight
polyline, spline and block instance in model space, and one associative
aligned dimension per feature drawn on the sheet through the viewport.

Each association exercises a different part of the chain and feature
resolution: endpoints on a line, quadrants on a circle, endpoints on an
arc, an endpoint and a bulge segment on a polyline, a tangent-to-spline
reference (the 115448 shape), a viewport -> insert -> line chain through
a block instance, and an intersection with a second object chain. Every
association is marked trans_space, so all of them fail on the pre-PR3
resolver and all of them are expected to resolve now.

The expected values are checkable by hand: the viewport maps model
(x, y) to paper (150 + (x - 150)/2, 100 + (y - 150)/2), so a 100-unit
model length is 50 paper units and must still display as 100.

Verification tests come in the next pass; the fixture is committed now
so they have something to read.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

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Christopher OverbeckandClaude Fable 5.1 committed 2026-09-15 12:46:04 -05:00

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tests/fixtures/dim_assoc/viewport_associations.dxf

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