f290e2614a
Add swipe.sx: a pure swipe_intent(layout, start, end) -> ?Swap that turns a touch drag into an optional adjacent-swap intent (A, B). A is the cell under the drag start (via BoardLayout.point_to_cell); B is its orthogonal neighbour along the drag's dominant axis (larger of |dx|,|dy|, ties horizontal). Returns null for sub-threshold drags (a tap, threshold = cell_size * 0.5), starts off the board, or neighbours off the board. No rendering, no model mutation. Lock the logic with tests/swipe_intent.sx (+ expected golden), feeding synthetic down/up positions for right/left/up/down, sub-threshold tap, diagonal→dominant (both axes), edge-outward off-board, and start-off-board. bash tools/run_tests.sh passes (13/13); sx build --target ios-sim main.sx compiles.
13 lines
290 B
Plaintext
13 lines
290 B
Plaintext
grid origin (100,0) cell 75 threshold 37
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right: (3,5)->(4,5)
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left: (3,5)->(2,5)
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up: (3,5)->(3,4)
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down: (3,5)->(3,6)
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short: none
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diag-horizontal: (3,5)->(4,5)
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diag-vertical: (3,5)->(3,4)
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offboard-right: none
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offboard-up: none
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start-offboard: none
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ok: swipe-intent mapping resolves all cases
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