91 lines
3.8 KiB
JavaScript
91 lines
3.8 KiB
JavaScript
#!/usr/bin/env node
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/*
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* build-mini-graph.mjs — builds the committed mini-graph.bin fixture.
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* ----------------------------------------------------------------------
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* A MAINTAINER-TIME REPO TOOL: regenerates routing/test/fixtures/
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* mini-graph.bin — the A* correctness ground truth (plan 06-01) and the
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* snap/astar suites' shared fixture. NOT a runtime dependency; nothing in
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* bot/src/, web/src/, or routing/src/ imports it. Tests consume the
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* COMMITTED binary; only a deliberate fixture redesign re-runs this.
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*
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* PROVENANCE (Phase 8 plan 08-01): routing/test/fixtures/mini-graph-arg1.bin
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* holds the frozen ARG1-era bytes preserved expressly as the v1
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* decode-rejection vector consumed by the G-suite — it is NOT regenerated
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* by this script, ever.
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*
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* Usage: node routing/test/fixtures/build-mini-graph.mjs
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* Exit: 0 on write; throws on any invariant violation (never writes).
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*
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* Design (pinned by 06-01): a hand-built 5x5 grid in a ~0.002 deg x 0.002 deg
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* bbox near KL center (lat 3.1500–3.1520, lng 101.6900–101.6920):
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* - 25 nodes, 80 directed edge entries (20 H + 20 V segments, both ways)
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* - three named streets: "Jalan Mini 1" (interior E-W rows),
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* "Jalan Mini 2" (interior N-S columns), "Jalan Persiaran Mini" (perimeter)
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* - exactly ONE oneway pair: 2 -> 3 traversable, 3 -> 2 flagged bit0
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* - two speed classes: perimeter 60 km/h, interior 30 km/h
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* (weights = segment meters / (kmh / 3.6), meters via haversineM)
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*/
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import { writeFileSync } from "node:fs";
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import { encodeGraph } from "../../src/graph.ts";
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import { haversineM } from "../../src/geo.ts";
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const GRID = 5;
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const LAT0 = 3.15;
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const LNG0 = 101.69;
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const STEP_DEG = 0.0005;
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/** The single oneway pair (grid ids: row 0, cols 2->3). */
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const ONEWAY_U = 2;
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const ONEWAY_V = 3;
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const NAME_MINI_1 = 0; // interior E-W rows
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const NAME_MINI_2 = 1; // interior N-S columns
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const NAME_PERIMETER = 2;
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const names = ["Jalan Mini 1", "Jalan Mini 2", "Jalan Persiaran Mini"];
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const SPEED_PERIMETER_KMH = 60;
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const SPEED_INTERIOR_KMH = 30;
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const lat = [];
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const lng = [];
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for (let r = 0; r < GRID; r++) {
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for (let c = 0; c < GRID; c++) {
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// 1e-6 integer grid then divide — exact decimal coordinates (the codec's
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// grid law); naive `3.15 + r * 0.0005` accumulates float error.
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lat.push((3150000 + r * 500) / 1e6);
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lng.push((101690000 + c * 500) / 1e6);
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}
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}
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const id = (r, c) => r * GRID + c;
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const edges = [];
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function addEdge(u, v, nameId) {
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const kmh = nameId === NAME_PERIMETER ? SPEED_PERIMETER_KMH : SPEED_INTERIOR_KMH;
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const meters = haversineM({ lat: lat[u], lng: lng[u] }, { lat: lat[v], lng: lng[v] });
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edges.push({ from: u, to: v, seconds: meters / (kmh / 3.6), nameId });
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}
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for (let r = 0; r < GRID; r++) {
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for (let c = 0; c < GRID - 1; c++) {
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const nameId = r === 0 || r === GRID - 1 ? NAME_PERIMETER : NAME_MINI_1;
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addEdge(id(r, c), id(r, c + 1), nameId);
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addEdge(id(r, c + 1), id(r, c), nameId);
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}
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}
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for (let c = 0; c < GRID; c++) {
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for (let r = 0; r < GRID - 1; r++) {
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const nameId = c === 0 || c === GRID - 1 ? NAME_PERIMETER : NAME_MINI_2;
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addEdge(id(r, c), id(r + 1, c), nameId);
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addEdge(id(r + 1, c), id(r, c), nameId);
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}
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}
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// Exactly ONE oneway: the reverse mirror of U->V carries flags bit0.
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const reverse = edges.find((e) => e.from === ONEWAY_V && e.to === ONEWAY_U);
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if (!reverse) throw new Error("oneway reverse edge not found — grid invariant broken");
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reverse.flags = 1;
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if (edges.length !== 80) throw new Error(`expected 80 directed edges, built ${edges.length}`);
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const bin = encodeGraph({ lat, lng, edges, names, maxSpeedKmh: SPEED_PERIMETER_KMH });
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writeFileSync(new URL("./mini-graph.bin", import.meta.url), Buffer.from(bin));
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console.log(`mini-graph.bin: ${GRID * GRID} nodes, ${edges.length} edges, 3 names, ${bin.byteLength} B`);
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