Orkuncakilkaya
07e5a20c0e
Grid.* operates on the Map tilemap (Map.size/Map.row): a cell is passable unless
it is out of bounds or holds the caller's `wall` tile (a char code, e.g. '#'), so
any impassable glyph works. Everything is integer and deterministic.
- Grid.line(x0,y0,x1,y1) -> []Cell Bresenham line cells (LOS/raycast base)
- Grid.blocked(x,y,wall) -> bool the shared passability test
- Grid.line_of_sight(x0,y0,x1,y1,wall) unobstructed straight line?
- Grid.flood(x,y,wall) -> []Cell 4-connected reachable region (BFS)
- Grid.a_star(x0,y0,x1,y1,wall) -> []Cell shortest 4-connected path (A*,
Manhattan heuristic), empty if unreachable
The engine (runtime/native/grid.ludic, ~150 lines of Ludic, C-free) is spliced
into a game via core.ludic since it reads the tilemap runtime; returned Cell
slices are ordinary Ludic slices (`len` / `[i]`; each cell has `.x` `.y`).
Pathfinding lives under Grid rather than a `Path` namespace — that name is
already the filesystem-paths library (#10).
Verified against Python references: a 1500-case fuzzer over random maps agrees
exactly on A* path length (optimal, == BFS), flood-fill count, and line-of-sight.
examples/library/grid.ludic asserts the behaviour and is wired into `x test`
(now 61 passed); docs: a Grid section + 5 per-symbol pages, inventory/coverage
green. Seed reseeded; the C-free bootstrap fixpoint holds.
Scope: this lands the Grid.*/pathfinding half of #24. The ECS Query.* helpers
(count/first, and nearest/within which want a runtime spatial index) remain the
tracked follow-up the issue calls out as blocked.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
26 lines
612 B
Markdown
26 lines
612 B
Markdown
---
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id: grid-blocked
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name: Grid.blocked
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category: grid
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kind: namespace-method
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tokens: Grid.blocked
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sig: Grid.blocked(x, y, wall) -> bool
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tip: True if the cell is out of bounds or holds the wall tile.
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order: 2
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ns: Grid
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member: blocked
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---
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Whether <code>(x, y)</code> blocks movement — <code>true</code> if it is out of bounds or its tile equals <code>wall</code>. The passability test the other Grid functions share.
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Parameters:
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- `x`, `y` — the cell
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- `wall` — the impassable tile char, e.g. `'#'`
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```ludic
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program Demo {
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handler H phase Update {
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if Grid.blocked(0, 0, '#') { print(1) }
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}
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}
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```
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