feat: move biomes code to a separate module, reduce deserts amount

main.js

@@ -159,7 +159,7 @@ let notes = [];
 let rulers = new Rulers();
 let customization = 0;
 
-let biomesData = applyDefaultBiomesSystem();
+let biomesData = Biomes.getDefault();
 let nameBases = Names.getNameBases(); // cultures-related data
 
 let color = d3.scaleSequential(d3.interpolateSpectral); // default color scheme
@@ -425,79 +425,6 @@ function findBurgForMFCG(params) {
   tip("Here stands the glorious city of " + b.name, true, "success", 15000);
 }
 
-// apply default biomes data
-function applyDefaultBiomesSystem() {
-  const name = [
-    "Marine",
-    "Hot desert",
-    "Cold desert",
-    "Savanna",
-    "Grassland",
-    "Tropical seasonal forest",
-    "Temperate deciduous forest",
-    "Tropical rainforest",
-    "Temperate rainforest",
-    "Taiga",
-    "Tundra",
-    "Glacier",
-    "Wetland"
-  ];
-  const color = [
-    "#466eab",
-    "#fbe79f",
-    "#b5b887",
-    "#d2d082",
-    "#c8d68f",
-    "#b6d95d",
-    "#29bc56",
-    "#7dcb35",
-    "#409c43",
-    "#4b6b32",
-    "#96784b",
-    "#d5e7eb",
-    "#0b9131"
-  ];
-  const habitability = [0, 4, 10, 22, 30, 50, 100, 80, 90, 12, 4, 0, 12];
-  const iconsDensity = [0, 3, 2, 120, 120, 120, 120, 150, 150, 100, 5, 0, 150];
-  const icons = [
-    {},
-    {dune: 3, cactus: 6, deadTree: 1},
-    {dune: 9, deadTree: 1},
-    {acacia: 1, grass: 9},
-    {grass: 1},
-    {acacia: 8, palm: 1},
-    {deciduous: 1},
-    {acacia: 5, palm: 3, deciduous: 1, swamp: 1},
-    {deciduous: 6, swamp: 1},
-    {conifer: 1},
-    {grass: 1},
-    {},
-    {swamp: 1}
-  ];
-  const cost = [10, 200, 150, 60, 50, 70, 70, 80, 90, 200, 1000, 5000, 150]; // biome movement cost
-  const biomesMartix = [
-    // hot ↔ cold [>19°C; <-4°C]; dry ↕ wet
-    new Uint8Array([1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 10]),
-    new Uint8Array([1, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 9, 9, 9, 9, 10, 10, 10]),
-    new Uint8Array([5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 9, 9, 9, 9, 9, 10, 10, 10]),
-    new Uint8Array([5, 6, 6, 6, 6, 6, 6, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10]),
-    new Uint8Array([7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 10, 10])
-  ];
-
-  // parse icons weighted array into a simple array
-  for (let i = 0; i < icons.length; i++) {
-    const parsed = [];
-    for (const icon in icons[i]) {
-      for (let j = 0; j < icons[i][icon]; j++) {
-        parsed.push(icon);
-      }
-    }
-    icons[i] = parsed;
-  }
-
-  return {i: d3.range(0, name.length), name, color, biomesMartix, habitability, iconsDensity, icons, cost};
-}
-
 function handleZoom(isScaleChanged, isPositionChanged) {
   viewbox.attr("transform", `translate(${viewX} ${viewY}) scale(${scale})`);
 
@@ -708,7 +635,7 @@ async function generate(options) {
     Rivers.generate();
     drawRivers();
     Lakes.defineGroup();
-    defineBiomes();
+    Biomes.define();
 
     rankCells();
     Cultures.generate();
@@ -1499,45 +1426,6 @@ function isWetLand(moisture, temperature, height) {
   return false;
 }
 
-// assign biome id for each cell
-function defineBiomes() {
-  TIME && console.time("defineBiomes");
-  const {cells} = pack;
-  const {temp, prec} = grid.cells;
-  cells.biome = new Uint8Array(cells.i.length); // biomes array
-
-  for (const i of cells.i) {
-    const temperature = temp[cells.g[i]];
-    const height = cells.h[i];
-    const moisture = height < 20 ? 0 : calculateMoisture(i);
-    cells.biome[i] = getBiomeId(moisture, temperature, height);
-  }
-
-  function calculateMoisture(i) {
-    let moist = prec[cells.g[i]];
-    if (cells.r[i]) moist += Math.max(cells.fl[i] / 20, 2);
-
-    const n = cells.c[i]
-      .filter(isLand)
-      .map(c => prec[cells.g[c]])
-      .concat([moist]);
-    return rn(4 + d3.mean(n));
-  }
-
-  TIME && console.timeEnd("defineBiomes");
-}
-
-// assign biome id to a cell
-function getBiomeId(moisture, temperature, height) {
-  if (height < 20) return 0; // marine biome: all water cells
-  if (temperature < -5) return 11; // permafrost biome
-  if (isWetLand(moisture, temperature, height)) return 12; // wetland biome
-
-  const moistureBand = Math.min((moisture / 5) | 0, 4); // [0-4]
-  const temperatureBand = Math.min(Math.max(20 - temperature, 0), 25); // [0-25]
-  return biomesData.biomesMartix[moistureBand][temperatureBand];
-}
-
 // assess cells suitability to calculate population and rand cells for culture center and burgs placement
 function rankCells() {
   TIME && console.time("rankCells");