fcf5d04727
Replaces the stub with the real sim per lanes/LANE-SIM.md round 1. - grid + placement/remove/rotate/setRecipe, footprint rotation, bounds - belts: 2 items/tile, 0.45 spacing enforced across the tile seam, back-pressure, merges, belt<->machine handoff - crafting: recipe buffers (2x in, stall at 4x out), edge-triggered jams - bandwidth v1: gen vs draw, compression generates, brownout = gen/draw scaling both craft progress and belt movement - shipping + commission tracking - output routing ranks belts by tracing the chain to its terminal machine, so the demuxer's three outputs reach three different consumers without splitters (see NOTES - biggest judgement call of the round) 18 tests. Measured 3,500 entities + 6,820 belt items at 0.42ms/tick (80x realtime). Full M1 chain ships MELT at tick 1149 in both node and browser. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
27 lines
879 B
TypeScript
27 lines
879 B
TypeScript
/** Grid math. Origin at world center, +x east, +y south, Dir 0..3 = N,E,S,W clockwise. */
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import type { Dir, Vec2 } from '../contracts';
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export const DIR_VEC: ReadonlyArray<Vec2> = [
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{ x: 0, y: -1 }, // 0 N
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{ x: 1, y: 0 }, // 1 E
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{ x: 0, y: 1 }, // 2 S
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{ x: -1, y: 0 }, // 3 W
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];
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export const GRID_MIN = -32;
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export const GRID_MAX = 31;
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/** Packs a tile into a unique number so occupancy can live in a flat Map. */
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export function tileKey(x: number, y: number): number {
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return (x + 32768) * 65536 + (y + 32768);
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}
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export function inBounds(x: number, y: number): boolean {
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return x >= GRID_MIN && x <= GRID_MAX && y >= GRID_MIN && y <= GRID_MAX;
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}
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/** Footprint after rotation — facing E or W swaps width and height. */
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export function footprintOf(fp: Vec2, dir: Dir): Vec2 {
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return dir === 1 || dir === 3 ? { x: fp.y, y: fp.x } : { x: fp.x, y: fp.y };
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}
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