47 lines
1.8 KiB
JavaScript
47 lines
1.8 KiB
JavaScript
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import { MAP_H, MAP_W, SIZE, clamp, indexOf } from "./mapUtils.js";
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import { influenceFromPoints } from "./mapGeneratorHelpers.js";
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export function buildSettlementDemandFields(ctx) {
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const {
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sea, agriculture, plain, basinField, coastalLowland, slope, ridgeField,
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modernCities, markets, commercialPorts, villages,
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} = ctx;
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const preliminaryUrbanInfluence = influenceFromPoints(modernCities, 18, (c) => clamp((c.population || 60000) / 260000, 0.55, 2.0));
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const preliminaryTownInfluence = influenceFromPoints([...markets, ...commercialPorts], 10, (p) => p.portClass === "major" ? 1.35 : clamp((p.population || 12000) / 36000, 0.42, 1.1));
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const preliminaryVillageInfluence = influenceFromPoints(villages, 7, (v) => clamp((v.population || 1800) / 5200, 0.22, 0.9));
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const settlementDemand = new Float32Array(SIZE);
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const urbanEdge = new Float32Array(SIZE);
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const logisticsPreSuitability = new Float32Array(SIZE);
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for (let y = 0; y < MAP_H; y++) {
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for (let x = 0; x < MAP_W; x++) {
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const i = indexOf(x, y);
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if (sea[i]) continue;
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const density = clamp(preliminaryUrbanInfluence[i] * 0.62 + preliminaryTownInfluence[i] * 0.34 + preliminaryVillageInfluence[i] * 0.16);
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settlementDemand[i] = density;
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urbanEdge[i] = clamp(1 - Math.abs(density - 0.46) / 0.32);
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logisticsPreSuitability[i] = clamp(
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agriculture[i] * 0.30 +
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plain[i] * 0.24 +
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basinField[i] * 0.14 +
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coastalLowland[i] * 0.12 +
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preliminaryTownInfluence[i] * 0.18 +
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urbanEdge[i] * 0.34 -
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preliminaryUrbanInfluence[i] * 0.20 -
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slope[i] * 0.50 -
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ridgeField[i] * 0.32
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);
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}
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}
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return {
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preliminaryUrbanInfluence,
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preliminaryTownInfluence,
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preliminaryVillageInfluence,
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settlementDemand,
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urbanEdge,
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logisticsPreSuitability,
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};
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}
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