55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
import { fnv1a32, hash2u32, mulberry32 } from "../../public/src/rng.js";
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import { generatePlanet, formatPlanet } from "../../public/src/planetGeneration.js";
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const GRID_W = 100;
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const GRID_H = 100;
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const OUTER_RADIUS = 50;
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const INNER_RADIUS = 30;
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const PLANET_CHANCE = 0.1;
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export function cellCenter(x, y) {
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const cx = (GRID_W - 1) / 2;
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const cy = (GRID_H - 1) / 2;
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return { dx: x - cx, dy: y - cy };
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}
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export function isExploitable(x, y) {
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const { dx, dy } = cellCenter(x, y);
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const r = Math.hypot(dx, dy);
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return r <= OUTER_RADIUS - 0.5 && r >= INNER_RADIUS - 0.5;
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}
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export function hasPlanetAt(x, y, seedU32) {
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const h = hash2u32(x, y, seedU32);
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return h / 4294967296 < PLANET_CHANCE;
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}
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export function computeCell(seedStr, x, y) {
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const seedU32 = fnv1a32(seedStr);
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const exploitable = isExploitable(x, y);
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if (!exploitable) {
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return { x, y, exploitable: false, hasPlanet: false, planet: null, formatted: null };
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}
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const hp = hasPlanetAt(x, y, seedU32);
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if (!hp) {
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return { x, y, exploitable: true, hasPlanet: false, planet: null, formatted: null };
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}
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const h = hash2u32(x, y, seedU32 ^ 0xa5a5a5a5);
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const rng = mulberry32(h);
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const planet = generatePlanet(rng);
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return {
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x, y, exploitable: true, hasPlanet: true,
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planet, formatted: formatPlanet(planet),
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};
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}
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export function rowToCellPayload(row) {
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return {
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x: row.x,
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y: row.y,
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exploitable: row.exploitable,
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hasPlanet: row.has_planet,
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planet: row.planet_json ?? null,
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discoveredBy: row.discovered_by,
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};
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} |