Ryan Malloy
accec686f8
Add diagonal_win.dsn: a 45-degree pin-to-pin net with a keepout placed inside the diagonal's bounding box but clear of the true thin copper. Orthogonal routing connects it with a Manhattan-length staircase (1600000); diagonal routing replaces that with a single 45-degree trace at the ideal hypotenuse length (1131371) -- a 29% reduction -- DRC-clean via the search tree and via an independent reconstruction of the emitted 45-degree copper's clearance octagon. test_exact_clearance_is_load_bearing shows the keepout overlaps the coarse bounding box but not the exact octagon, so the exact clearance (not the box) is what lets the diagonal route. Determinism, endpoints-on-pads, valid SES, and diagonal-off-equals-orthogonal (additive, over four fixtures) are covered.
DSN test fixtures
Hand-crafted minimal Specctra DSN files, written to exercise the parser. They
are modeled on the real fixtures shipped in the upstream FreeRouting repo
(fixtures/empty_board.dsn and fixtures/SMD-routing-issue-demo.dsn) so the
grammar and formatting match what kicad-cli pcb export specctra-dsn and
FreeRouting itself produce, but they were typed fresh here (no upstream file is
copied into this tree).
empty_board.dsn— the smallest valid board: parser, resolution, unit, and a structure with two signal layers and apcbboundary path. Modeled on FreeRoutingfixtures/empty_board.dsn.smd_demo.dsn— a fuller board exercising every scope the parser handles: quoted board/padstack/image names,via, defaultrule(width + clearance with a(type smd_smd)pair), akeepout, padstacks (rect and circle pads), images with pins, placement withfront/rotation, nets withComp-Pinreferences, and aclasswithcircuit/use_viaand arule. Modeled on FreeRoutingfixtures/SMD-routing-issue-demo.dsn.