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Tommaso Bianchi
a63bba2d55
Port of snaporca 9fa304c77a. Parity OK: 17 files identical, 8 diverging at their expected counts. The everyday dimension in SolidWorks and Onshape, and this kernel had no form of it. Distance constrains the straight-line gap; LockX/LockY pin one point's ABSOLUTE coordinate. Neither relates two points along an axis. DistanceX/DistanceY emit SLVS_C_PROJ_PT_DISTANCE against two unit direction lines built in the solver's G_FIXED group, so they add no degrees of freedom. THE DIRECTION IS SIGNED, and getting it backwards is silent. libslvs defines a LINE_SEGMENT's direction as point[0] - point[1] (entity.cpp) and PROJ_PT_DISTANCE constrains (pB - pA).dot(dir) (constrainteq.cpp:234), so the reference lines are built head-first to mean +X and +Y. The same signedness was a real defect in the GUI: the inline editor was pre-filled with |delta|, so when the closest endpoint pair ran right-to-left, opening the dimension and accepting the number shown would flip the point to the other side of its anchor. Opening a dimension and accepting its own value must be a no-op. The refs are now ordered so the shown value is positive. On the CAD-1000-hours corpus, dimensioning and constraining is 31.9% of all observed CAD time -- the largest single class, 7.6x feature operations. This is the item in the constraint epic that lands most directly on it. VERIFICATION LIMIT, as with the previous commit: this fork's kernel suite still cannot run (find_package(assimp) fails at configure time, snaporca-w80c). The shared sources are byte-identical to snaporca's, where kernel is 2603 assertions / 200 cases and ALL LADDERS HELD across all seven rungs.