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main.js
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"use strict";
// Azgaar ([email protected]). Minsk, 2017-2023. MIT License
// https://github.com/Azgaar/Fantasy-Map-Generator
// set debug options
const PRODUCTION = location.hostname && location.hostname !== "localhost" && location.hostname !== "127.0.0.1";
const DEBUG = localStorage.getItem("debug");
const INFO = true;
const TIME = true;
const WARN = true;
const ERROR = true;
// detect device
const MOBILE = window.innerWidth < 600 || navigator.userAgentData?.mobile;
// typed arrays max values
const UINT8_MAX = 255;
const UINT16_MAX = 65535;
const UINT32_MAX = 4294967295;
if (PRODUCTION && "serviceWorker" in navigator) {
window.addEventListener("load", () => {
navigator.serviceWorker.register("./sw.js").catch(err => {
console.error("ServiceWorker registration failed: ", err);
});
});
window.addEventListener(
"beforeinstallprompt",
async event => {
event.preventDefault();
const Installation = await import("./modules/dynamic/installation.js?v=1.89.19");
Installation.init(event);
},
{once: true}
);
}
// append svg layers (in default order)
let svg = d3.select("#map");
let defs = svg.select("#deftemp");
let viewbox = svg.select("#viewbox");
let scaleBar = svg.select("#scaleBar");
let legend = svg.append("g").attr("id", "legend");
let ocean = viewbox.append("g").attr("id", "ocean");
let oceanLayers = ocean.append("g").attr("id", "oceanLayers");
let oceanPattern = ocean.append("g").attr("id", "oceanPattern");
let lakes = viewbox.append("g").attr("id", "lakes");
let landmass = viewbox.append("g").attr("id", "landmass");
let texture = viewbox.append("g").attr("id", "texture");
let terrs = viewbox.append("g").attr("id", "terrs");
let biomes = viewbox.append("g").attr("id", "biomes");
let cells = viewbox.append("g").attr("id", "cells");
let gridOverlay = viewbox.append("g").attr("id", "gridOverlay");
let coordinates = viewbox.append("g").attr("id", "coordinates");
let compass = viewbox.append("g").attr("id", "compass").style("display", "none");
let rivers = viewbox.append("g").attr("id", "rivers");
let terrain = viewbox.append("g").attr("id", "terrain");
let relig = viewbox.append("g").attr("id", "relig");
let cults = viewbox.append("g").attr("id", "cults");
let regions = viewbox.append("g").attr("id", "regions");
let statesBody = regions.append("g").attr("id", "statesBody");
let statesHalo = regions.append("g").attr("id", "statesHalo");
let provs = viewbox.append("g").attr("id", "provs");
let zones = viewbox.append("g").attr("id", "zones").style("display", "none");
let borders = viewbox.append("g").attr("id", "borders");
let stateBorders = borders.append("g").attr("id", "stateBorders");
let provinceBorders = borders.append("g").attr("id", "provinceBorders");
let routes = viewbox.append("g").attr("id", "routes");
let roads = routes.append("g").attr("id", "roads");
let trails = routes.append("g").attr("id", "trails");
let searoutes = routes.append("g").attr("id", "searoutes");
let temperature = viewbox.append("g").attr("id", "temperature");
let coastline = viewbox.append("g").attr("id", "coastline");
let ice = viewbox.append("g").attr("id", "ice").style("display", "none");
let prec = viewbox.append("g").attr("id", "prec").style("display", "none");
let population = viewbox.append("g").attr("id", "population");
let emblems = viewbox.append("g").attr("id", "emblems").style("display", "none");
let labels = viewbox.append("g").attr("id", "labels");
let icons = viewbox.append("g").attr("id", "icons");
let burgIcons = icons.append("g").attr("id", "burgIcons");
let anchors = icons.append("g").attr("id", "anchors");
let armies = viewbox.append("g").attr("id", "armies").style("display", "none");
let markers = viewbox.append("g").attr("id", "markers");
let fogging = viewbox
.append("g")
.attr("id", "fogging-cont")
.attr("mask", "url(#fog)")
.append("g")
.attr("id", "fogging")
.style("display", "none");
let ruler = viewbox.append("g").attr("id", "ruler").style("display", "none");
let debug = viewbox.append("g").attr("id", "debug");
lakes.append("g").attr("id", "freshwater");
lakes.append("g").attr("id", "salt");
lakes.append("g").attr("id", "sinkhole");
lakes.append("g").attr("id", "frozen");
lakes.append("g").attr("id", "lava");
lakes.append("g").attr("id", "dry");
coastline.append("g").attr("id", "sea_island");
coastline.append("g").attr("id", "lake_island");
terrs.append("g").attr("id", "oceanHeights");
terrs.append("g").attr("id", "landHeights");
labels.append("g").attr("id", "states");
labels.append("g").attr("id", "addedLabels");
let burgLabels = labels.append("g").attr("id", "burgLabels");
burgIcons.append("g").attr("id", "cities");
burgLabels.append("g").attr("id", "cities");
anchors.append("g").attr("id", "cities");
burgIcons.append("g").attr("id", "towns");
burgLabels.append("g").attr("id", "towns");
anchors.append("g").attr("id", "towns");
// population groups
population.append("g").attr("id", "rural");
population.append("g").attr("id", "urban");
// emblem groups
emblems.append("g").attr("id", "burgEmblems");
emblems.append("g").attr("id", "provinceEmblems");
emblems.append("g").attr("id", "stateEmblems");
// compass
compass.append("use").attr("xlink:href", "#defs-compass-rose");
// fogging
fogging.append("rect").attr("x", 0).attr("y", 0).attr("width", "100%").attr("height", "100%");
fogging
.append("rect")
.attr("x", 0)
.attr("y", 0)
.attr("width", "100%")
.attr("height", "100%")
.attr("fill", "#e8f0f6")
.attr("filter", "url(#splotch)");
// assign events separately as not a viewbox child
scaleBar.on("mousemove", () => tip("Click to open Units Editor")).on("click", () => editUnits());
legend
.on("mousemove", () => tip("Drag to change the position. Click to hide the legend"))
.on("click", () => clearLegend());
// main data variables
let grid = {}; // initial graph based on jittered square grid and data
let pack = {}; // packed graph and data
let seed;
let mapId;
let mapHistory = [];
let elSelected;
let modules = {};
let notes = [];
let rulers = new Rulers();
let customization = 0;
let biomesData = Biomes.getDefault();
let nameBases = Names.getNameBases(); // cultures-related data
let color = d3.scaleSequential(d3.interpolateSpectral); // default color scheme
const lineGen = d3.line().curve(d3.curveBasis); // d3 line generator with default curve interpolation
// d3 zoom behavior
let scale = 1;
let viewX = 0;
let viewY = 0;
function onZoom() {
const {k, x, y} = d3.event.transform;
const isScaleChanged = Boolean(scale - k);
const isPositionChanged = Boolean(viewX - x || viewY - y);
if (!isScaleChanged && !isPositionChanged) return;
scale = k;
viewX = x;
viewY = y;
handleZoom(isScaleChanged, isPositionChanged);
}
const onZoomDebouced = debounce(onZoom, 50);
const zoom = d3.zoom().scaleExtent([1, 20]).on("zoom", onZoomDebouced);
// default options, based on Earth data
let options = {
pinNotes: false,
winds: [225, 45, 225, 315, 135, 315],
temperatureEquator: 27,
temperatureNorthPole: -30,
temperatureSouthPole: -15,
stateLabelsMode: "auto",
showBurgPreview: true,
villageMaxPopulation: 2000
};
let mapCoordinates = {}; // map coordinates on globe
let populationRate = +byId("populationRateInput").value;
let distanceScale = +byId("distanceScaleInput").value;
let urbanization = +byId("urbanizationInput").value;
let urbanDensity = +byId("urbanDensityInput").value;
applyStoredOptions();
// voronoi graph extension, cannot be changed after generation
let graphWidth = +mapWidthInput.value;
let graphHeight = +mapHeightInput.value;
// svg canvas resolution, can be changed
let svgWidth = graphWidth;
let svgHeight = graphHeight;
landmass.append("rect").attr("x", 0).attr("y", 0).attr("width", graphWidth).attr("height", graphHeight);
oceanPattern
.append("rect")
.attr("fill", "url(#oceanic)")
.attr("x", 0)
.attr("y", 0)
.attr("width", graphWidth)
.attr("height", graphHeight);
oceanLayers
.append("rect")
.attr("id", "oceanBase")
.attr("x", 0)
.attr("y", 0)
.attr("width", graphWidth)
.attr("height", graphHeight);
document.addEventListener("DOMContentLoaded", async () => {
if (!location.hostname) {
const wiki = "https://github.com/Azgaar/Fantasy-Map-Generator/wiki/Run-FMG-locally";
alertMessage.innerHTML = /* html */ `Fantasy Map Generator cannot run serverless. Follow the <a href="${wiki}" target="_blank">instructions</a> on how you can easily run a local web-server`;
$("#alert").dialog({
resizable: false,
title: "Loading error",
width: "28em",
position: {my: "center center-4em", at: "center", of: "svg"},
buttons: {
OK: function () {
$(this).dialog("close");
}
}
});
} else {
hideLoading();
await checkLoadParameters();
}
restoreDefaultEvents(); // apply default viewbox events
initiateAutosave();
});
function hideLoading() {
d3.select("#loading").transition().duration(3000).style("opacity", 0);
d3.select("#optionsContainer").transition().duration(2000).style("opacity", 1);
d3.select("#tooltip").transition().duration(3000).style("opacity", 1);
}
function showLoading() {
d3.select("#loading").transition().duration(200).style("opacity", 1);
d3.select("#optionsContainer").transition().duration(100).style("opacity", 0);
d3.select("#tooltip").transition().duration(200).style("opacity", 0);
}
// decide which map should be loaded or generated on page load
async function checkLoadParameters() {
const url = new URL(window.location.href);
const params = url.searchParams;
// of there is a valid maplink, try to load .map/.gz file from URL
if (params.get("maplink")) {
WARN && console.warn("Load map from URL");
const maplink = params.get("maplink");
const pattern = /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/;
const valid = pattern.test(maplink);
if (valid) {
setTimeout(() => {
loadMapFromURL(maplink, 1);
}, 1000);
return;
} else showUploadErrorMessage("Map link is not a valid URL", maplink);
}
// if there is a seed (user of MFCG provided), generate map for it
if (params.get("seed")) {
WARN && console.warn("Generate map for seed");
await generateMapOnLoad();
return;
}
// check if there is a map saved to indexedDB
if (byId("onloadBehavior").value === "lastSaved") {
try {
const blob = await ldb.get("lastMap");
if (blob) {
WARN && console.warn("Loading last stored map");
uploadMap(blob);
return;
}
} catch (error) {
ERROR && console.error(error);
}
}
// else generate random map
WARN && console.warn("Generate random map");
generateMapOnLoad();
}
async function generateMapOnLoad() {
await applyStyleOnLoad(); // apply previously selected default or custom style
await generate(); // generate map
applyPreset(); // apply saved layers preset
fitMapToScreen();
focusOn(); // based on searchParams focus on point, cell or burg from MFCG
}
// focus on coordinates, cell or burg provided in searchParams
function focusOn() {
const url = new URL(window.location.href);
const params = url.searchParams;
const fromMGCG = params.get("from") === "MFCG" && document.referrer;
if (fromMGCG) {
if (params.get("seed").length === 13) {
// show back burg from MFCG
const burgSeed = params.get("seed").slice(-4);
params.set("burg", burgSeed);
} else {
// select burg for MFCG
findBurgForMFCG(params);
return;
}
}
const scaleParam = params.get("scale");
const cellParam = params.get("cell");
const burgParam = params.get("burg");
if (scaleParam || cellParam || burgParam) {
const scale = +scaleParam || 8;
if (cellParam) {
const cell = +params.get("cell");
const [x, y] = pack.cells.p[cell];
zoomTo(x, y, scale, 1600);
return;
}
if (burgParam) {
const burg = isNaN(+burgParam) ? pack.burgs.find(burg => burg.name === burgParam) : pack.burgs[+burgParam];
if (!burg) return;
const {x, y} = burg;
zoomTo(x, y, scale, 1600);
return;
}
const x = +params.get("x") || graphWidth / 2;
const y = +params.get("y") || graphHeight / 2;
zoomTo(x, y, scale, 1600);
}
}
// find burg for MFCG and focus on it
function findBurgForMFCG(params) {
const cells = pack.cells,
burgs = pack.burgs;
if (pack.burgs.length < 2) {
ERROR && console.error("Cannot select a burg for MFCG");
return;
}
// used for selection
const size = +params.get("size");
const coast = +params.get("coast");
const port = +params.get("port");
const river = +params.get("river");
let selection = defineSelection(coast, port, river);
if (!selection.length) selection = defineSelection(coast, !port, !river);
if (!selection.length) selection = defineSelection(!coast, 0, !river);
if (!selection.length) selection = [burgs[1]]; // select first if nothing is found
function defineSelection(coast, port, river) {
if (port && river) return burgs.filter(b => b.port && cells.r[b.cell]);
if (!port && coast && river) return burgs.filter(b => !b.port && cells.t[b.cell] === 1 && cells.r[b.cell]);
if (!coast && !river) return burgs.filter(b => cells.t[b.cell] !== 1 && !cells.r[b.cell]);
if (!coast && river) return burgs.filter(b => cells.t[b.cell] !== 1 && cells.r[b.cell]);
if (coast && river) return burgs.filter(b => cells.t[b.cell] === 1 && cells.r[b.cell]);
return [];
}
// select a burg with closest population from selection
const selected = d3.scan(selection, (a, b) => Math.abs(a.population - size) - Math.abs(b.population - size));
const burgId = selection[selected].i;
if (!burgId) {
ERROR && console.error("Cannot select a burg for MFCG");
return;
}
const b = burgs[burgId];
const referrer = new URL(document.referrer);
for (let p of referrer.searchParams) {
if (p[0] === "name") b.name = p[1];
else if (p[0] === "size") b.population = +p[1];
else if (p[0] === "seed") b.MFCG = +p[1];
else if (p[0] === "shantytown") b.shanty = +p[1];
else b[p[0]] = +p[1]; // other parameters
}
if (params.get("name") && params.get("name") != "null") b.name = params.get("name");
const label = burgLabels.select("[data-id='" + burgId + "']");
if (label.size()) {
label
.text(b.name)
.classed("drag", true)
.on("mouseover", function () {
d3.select(this).classed("drag", false);
label.on("mouseover", null);
});
}
zoomTo(b.x, b.y, 8, 1600);
invokeActiveZooming();
tip("Here stands the glorious city of " + b.name, true, "success", 15000);
}
function handleZoom(isScaleChanged, isPositionChanged) {
viewbox.attr("transform", `translate(${viewX} ${viewY}) scale(${scale})`);
if (isPositionChanged) drawCoordinates();
if (isScaleChanged) {
invokeActiveZooming();
drawScaleBar(scaleBar, scale);
fitScaleBar(scaleBar, svgWidth, svgHeight);
}
// zoom image converter overlay
if (customization === 1) {
const canvas = byId("canvas");
if (!canvas || canvas.style.opacity === "0") return;
const img = byId("imageToConvert");
if (!img) return;
const ctx = canvas.getContext("2d");
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.setTransform(scale, 0, 0, scale, viewX, viewY);
ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
}
}
// Zoom to a specific point
function zoomTo(x, y, z = 8, d = 2000) {
const transform = d3.zoomIdentity.translate(x * -z + svgWidth / 2, y * -z + svgHeight / 2).scale(z);
svg.transition().duration(d).call(zoom.transform, transform);
}
// Reset zoom to initial
function resetZoom(d = 1000) {
svg.transition().duration(d).call(zoom.transform, d3.zoomIdentity);
}
// calculate x y extreme points of viewBox
function getViewBoxExtent() {
return [
[Math.abs(viewX / scale), Math.abs(viewY / scale)],
[Math.abs(viewX / scale) + graphWidth / scale, Math.abs(viewY / scale) + graphHeight / scale]
];
}
// active zooming feature
function invokeActiveZooming() {
const isOptimized = shapeRendering.value === "optimizeSpeed";
if (coastline.select("#sea_island").size() && +coastline.select("#sea_island").attr("auto-filter")) {
// toggle shade/blur filter for coatline on zoom
const filter = scale > 1.5 && scale <= 2.6 ? null : scale > 2.6 ? "url(#blurFilter)" : "url(#dropShadow)";
coastline.select("#sea_island").attr("filter", filter);
}
// rescale labels on zoom
if (labels.style("display") !== "none") {
labels.selectAll("g").each(function () {
if (this.id === "burgLabels") return;
const desired = +this.dataset.size;
const relative = Math.max(rn((desired + desired / scale) / 2, 2), 1);
if (rescaleLabels.checked) this.setAttribute("font-size", relative);
const hidden = hideLabels.checked && (relative * scale < 6 || relative * scale > 60);
if (hidden) this.classList.add("hidden");
else this.classList.remove("hidden");
});
}
// rescale emblems on zoom
if (emblems.style("display") !== "none") {
emblems.selectAll("g").each(function () {
const size = this.getAttribute("font-size") * scale;
const hidden = hideEmblems.checked && (size < 25 || size > 300);
if (hidden) this.classList.add("hidden");
else this.classList.remove("hidden");
if (!hidden && window.COArenderer && this.children.length && !this.children[0].getAttribute("href"))
renderGroupCOAs(this);
});
}
// turn off ocean pattern if scale is big (improves performance)
oceanPattern
.select("rect")
.attr("fill", scale > 10 ? "#fff" : "url(#oceanic)")
.attr("opacity", scale > 10 ? 0.2 : null);
// change states halo width
if (!customization && !isOptimized) {
const desired = +statesHalo.attr("data-width");
const haloSize = rn(desired / scale ** 0.8, 2);
statesHalo.attr("stroke-width", haloSize).style("display", haloSize > 0.1 ? "block" : "none");
}
// rescale map markers
+markers.attr("rescale") &&
pack.markers?.forEach(marker => {
const {i, x, y, size = 30, hidden} = marker;
const el = !hidden && byId(`marker${i}`);
if (!el) return;
const zoomedSize = Math.max(rn(size / 5 + 24 / scale, 2), 1);
el.setAttribute("width", zoomedSize);
el.setAttribute("height", zoomedSize);
el.setAttribute("x", rn(x - zoomedSize / 2, 1));
el.setAttribute("y", rn(y - zoomedSize, 1));
});
// rescale rulers to have always the same size
if (ruler.style("display") !== "none") {
const size = rn((10 / scale ** 0.3) * 2, 2);
ruler.selectAll("text").attr("font-size", size);
}
}
async function renderGroupCOAs(g) {
const [group, type] =
g.id === "burgEmblems"
? [pack.burgs, "burg"]
: g.id === "provinceEmblems"
? [pack.provinces, "province"]
: [pack.states, "state"];
for (let use of g.children) {
const i = +use.dataset.i;
const id = type + "COA" + i;
COArenderer.trigger(id, group[i].coa);
use.setAttribute("href", "#" + id);
}
}
// add drag to upload logic, pull request from @evyatron
void (function addDragToUpload() {
document.addEventListener("dragover", function (e) {
e.stopPropagation();
e.preventDefault();
byId("mapOverlay").style.display = null;
});
document.addEventListener("dragleave", function (e) {
byId("mapOverlay").style.display = "none";
});
document.addEventListener("drop", function (e) {
e.stopPropagation();
e.preventDefault();
const overlay = byId("mapOverlay");
overlay.style.display = "none";
if (e.dataTransfer.items == null || e.dataTransfer.items.length !== 1) return; // no files or more than one
const file = e.dataTransfer.items[0].getAsFile();
if (!file.name.endsWith(".map") && !file.name.endsWith(".gz")) {
alertMessage.innerHTML =
"Please upload a map file (<i>.map</i> or <i>.gz</i> formats) you have previously downloaded";
$("#alert").dialog({
resizable: false,
title: "Invalid file format",
position: {my: "center", at: "center", of: "svg"},
buttons: {
Close: function () {
$(this).dialog("close");
}
}
});
return;
}
// all good - show uploading text and load the map
overlay.style.display = null;
overlay.innerHTML = "Uploading<span>.</span><span>.</span><span>.</span>";
if (closeDialogs) closeDialogs();
uploadMap(file, () => {
overlay.style.display = "none";
overlay.innerHTML = "Drop a map file to open";
});
});
})();
async function generate(options) {
try {
const timeStart = performance.now();
const {seed: precreatedSeed, graph: precreatedGraph} = options || {};
invokeActiveZooming();
setSeed(precreatedSeed);
INFO && console.group("Generated Map " + seed);
applyGraphSize();
randomizeOptions();
if (shouldRegenerateGrid(grid, precreatedSeed)) grid = precreatedGraph || generateGrid();
else delete grid.cells.h;
grid.cells.h = await HeightmapGenerator.generate(grid);
pack = {}; // reset pack
markFeatures();
markupGridOcean();
addLakesInDeepDepressions();
openNearSeaLakes();
OceanLayers();
defineMapSize();
calculateMapCoordinates();
calculateTemperatures();
generatePrecipitation();
reGraph();
drawCoastline();
Rivers.generate();
drawRivers();
Lakes.defineGroup();
Biomes.define();
rankCells();
Cultures.generate();
Cultures.expand();
BurgsAndStates.generate();
Routes.generate();
Religions.generate();
BurgsAndStates.defineStateForms();
BurgsAndStates.generateProvinces();
BurgsAndStates.defineBurgFeatures();
drawStates();
drawBorders();
drawStateLabels();
Rivers.specify();
Lakes.generateName();
Military.generate();
Markers.generate();
addZones();
drawScaleBar(scaleBar, scale);
Names.getMapName();
WARN && console.warn(`TOTAL: ${rn((performance.now() - timeStart) / 1000, 2)}s`);
showStatistics();
INFO && console.groupEnd("Generated Map " + seed);
} catch (error) {
ERROR && console.error(error);
const parsedError = parseError(error);
clearMainTip();
alertMessage.innerHTML = /* html */ `An error has occurred on map generation. Please retry. <br />If error is critical, clear the stored data and try again.
<p id="errorBox">${parsedError}</p>`;
$("#alert").dialog({
resizable: false,
title: "Generation error",
width: "32em",
buttons: {
"Clear data": function () {
localStorage.clear();
localStorage.setItem("version", version);
},
Regenerate: function () {
regenerateMap("generation error");
$(this).dialog("close");
},
Ignore: function () {
$(this).dialog("close");
}
},
position: {my: "center", at: "center", of: "svg"}
});
}
}
// set map seed (string!)
function setSeed(precreatedSeed) {
if (!precreatedSeed) {
const first = !mapHistory[0];
const params = new URL(window.location.href).searchParams;
const urlSeed = params.get("seed");
if (first && params.get("from") === "MFCG" && urlSeed.length === 13) seed = urlSeed.slice(0, -4);
else if (first && urlSeed) seed = urlSeed;
else seed = generateSeed();
} else {
seed = precreatedSeed;
}
byId("optionsSeed").value = seed;
Math.random = aleaPRNG(seed);
}
// Mark features (ocean, lakes, islands) and calculate distance field
function markFeatures() {
TIME && console.time("markFeatures");
Math.random = aleaPRNG(seed); // get the same result on heightmap edit in Erase mode
const cells = grid.cells;
const heights = grid.cells.h;
cells.f = new Uint16Array(cells.i.length); // cell feature number
cells.t = new Int8Array(cells.i.length); // cell type: 1 = land coast; -1 = water near coast
grid.features = [0];
for (let i = 1, queue = [0]; queue[0] !== -1; i++) {
cells.f[queue[0]] = i; // feature number
const land = heights[queue[0]] >= 20;
let border = false; // true if feature touches map border
while (queue.length) {
const q = queue.pop();
if (cells.b[q]) border = true;
cells.c[q].forEach(c => {
const cLand = heights[c] >= 20;
if (land === cLand && !cells.f[c]) {
cells.f[c] = i;
queue.push(c);
} else if (land && !cLand) {
cells.t[q] = 1;
cells.t[c] = -1;
}
});
}
const type = land ? "island" : border ? "ocean" : "lake";
grid.features.push({i, land, border, type});
queue[0] = cells.f.findIndex(f => !f); // find unmarked cell
}
TIME && console.timeEnd("markFeatures");
}
function markupGridOcean() {
TIME && console.time("markupGridOcean");
markup(grid.cells, -2, -1, -10);
TIME && console.timeEnd("markupGridOcean");
}
// Calculate cell-distance to coast for every cell
function markup(cells, start, increment, limit) {
for (let t = start, count = Infinity; count > 0 && t > limit; t += increment) {
count = 0;
const prevT = t - increment;
for (let i = 0; i < cells.i.length; i++) {
if (cells.t[i] !== prevT) continue;
for (const c of cells.c[i]) {
if (cells.t[c]) continue;
cells.t[c] = t;
count++;
}
}
}
}
function addLakesInDeepDepressions() {
TIME && console.time("addLakesInDeepDepressions");
const {cells, features} = grid;
const {c, h, b} = cells;
const ELEVATION_LIMIT = +byId("lakeElevationLimitOutput").value;
if (ELEVATION_LIMIT === 80) return;
for (const i of cells.i) {
if (b[i] || h[i] < 20) continue;
const minHeight = d3.min(c[i].map(c => h[c]));
if (h[i] > minHeight) continue;
let deep = true;
const threshold = h[i] + ELEVATION_LIMIT;
const queue = [i];
const checked = [];
checked[i] = true;
// check if elevated cell can potentially pour to water
while (deep && queue.length) {
const q = queue.pop();
for (const n of c[q]) {
if (checked[n]) continue;
if (h[n] >= threshold) continue;
if (h[n] < 20) {
deep = false;
break;
}
checked[n] = true;
queue.push(n);
}
}
// if not, add a lake
if (deep) {
const lakeCells = [i].concat(c[i].filter(n => h[n] === h[i]));
addLake(lakeCells);
}
}
function addLake(lakeCells) {
const f = features.length;
lakeCells.forEach(i => {
cells.h[i] = 19;
cells.t[i] = -1;
cells.f[i] = f;
c[i].forEach(n => !lakeCells.includes(n) && (cells.t[c] = 1));
});
features.push({i: f, land: false, border: false, type: "lake"});
}
TIME && console.timeEnd("addLakesInDeepDepressions");
}
// near sea lakes usually get a lot of water inflow, most of them should break threshold and flow out to sea (see Ancylus Lake)
function openNearSeaLakes() {
if (byId("templateInput").value === "Atoll") return; // no need for Atolls
const cells = grid.cells;
const features = grid.features;
if (!features.find(f => f.type === "lake")) return; // no lakes
TIME && console.time("openLakes");
const LIMIT = 22; // max height that can be breached by water
for (const i of cells.i) {
const lakeFeatureId = cells.f[i];
if (features[lakeFeatureId].type !== "lake") continue; // not a lake
check_neighbours: for (const c of cells.c[i]) {
if (cells.t[c] !== 1 || cells.h[c] > LIMIT) continue; // water cannot break this
for (const n of cells.c[c]) {
const ocean = cells.f[n];
if (features[ocean].type !== "ocean") continue; // not an ocean
removeLake(c, lakeFeatureId, ocean);
break check_neighbours;
}
}
}
function removeLake(thresholdCellId, lakeFeatureId, oceanFeatureId) {
cells.h[thresholdCellId] = 19;
cells.t[thresholdCellId] = -1;
cells.f[thresholdCellId] = oceanFeatureId;
cells.c[thresholdCellId].forEach(function (c) {
if (cells.h[c] >= 20) cells.t[c] = 1; // mark as coastline
});
cells.i.forEach(i => {
if (cells.f[i] === lakeFeatureId) cells.f[i] = oceanFeatureId;
});
features[lakeFeatureId].type = "ocean"; // mark former lake as ocean
}
TIME && console.timeEnd("openLakes");
}
// define map size and position based on template and random factor
function defineMapSize() {
const [size, latitude, longitude] = getSizeAndLatitude();
const randomize = new URL(window.location.href).searchParams.get("options") === "default"; // ignore stored options
if (randomize || !locked("mapSize")) mapSizeOutput.value = mapSizeInput.value = size;
if (randomize || !locked("latitude")) latitudeOutput.value = latitudeInput.value = latitude;
if (randomize || !locked("longitude")) longitudeOutput.value = longitudeInput.value = longitude;
function getSizeAndLatitude() {
const template = byId("templateInput").value; // heightmap template
if (template === "africa-centric") return [45, 53, 38];
if (template === "arabia") return [20, 35, 35];
if (template === "atlantics") return [42, 23, 65];
if (template === "britain") return [7, 20, 51.3];
if (template === "caribbean") return [15, 40, 74.8];
if (template === "east-asia") return [11, 28, 9.4];
if (template === "eurasia") return [38, 19, 27];
if (template === "europe") return [20, 16, 44.8];
if (template === "europe-accented") return [14, 22, 44.8];
if (template === "europe-and-central-asia") return [25, 10, 39.5];
if (template === "europe-central") return [11, 22, 46.4];
if (template === "europe-north") return [7, 18, 48.9];
if (template === "greenland") return [22, 7, 55.8];
if (template === "hellenica") return [8, 27, 43.5];
if (template === "iceland") return [2, 15, 55.3];
if (template === "indian-ocean") return [45, 55, 14];
if (template === "mediterranean-sea") return [10, 29, 45.8];
if (template === "middle-east") return [8, 31, 34.4];
if (template === "north-america") return [37, 17, 87];
if (template === "us-centric") return [66, 27, 100];
if (template === "us-mainland") return [16, 30, 77.5];
if (template === "world") return [78, 27, 40];
if (template === "world-from-pacific") return [75, 32, 30]; // longitude doesn't fit
const part = grid.features.some(f => f.land && f.border); // if land goes over map borders
const max = part ? 80 : 100; // max size
const lat = () => gauss(P(0.5) ? 40 : 60, 20, 25, 75); // latitude shift
if (!part) {
if (template === "pangea") return [100, 50, 50];
if (template === "shattered" && P(0.7)) return [100, 50, 50];
if (template === "continents" && P(0.5)) return [100, 50, 50];
if (template === "archipelago" && P(0.35)) return [100, 50, 50];
if (template === "highIsland" && P(0.25)) return [100, 50, 50];
if (template === "lowIsland" && P(0.1)) return [100, 50, 50];
}
if (template === "pangea") return [gauss(70, 20, 30, max), lat(), 50];
if (template === "volcano") return [gauss(20, 20, 10, max), lat(), 50];
if (template === "mediterranean") return [gauss(25, 30, 15, 80), lat(), 50];
if (template === "peninsula") return [gauss(15, 15, 5, 80), lat(), 50];
if (template === "isthmus") return [gauss(15, 20, 3, 80), lat(), 50];
if (template === "atoll") return [gauss(3, 2, 1, 5, 1), lat(), 50];
return [gauss(30, 20, 15, max), lat(), 50]; // Continents, Archipelago, High Island, Low Island
}
}
// calculate map position on globe
function calculateMapCoordinates() {
const sizeFraction = +byId("mapSizeOutput").value / 100;
const latShift = +byId("latitudeOutput").value / 100;
const lonShift = +byId("longitudeOutput").value / 100;
const latT = rn(sizeFraction * 180, 1);
const latN = rn(90 - (180 - latT) * latShift, 1);
const latS = rn(latN - latT, 1);
const lonT = rn(Math.min((graphWidth / graphHeight) * latT, 360), 1);
const lonE = rn(180 - (360 - lonT) * lonShift, 1);
const lonW = rn(lonE - lonT, 1);
mapCoordinates = {latT, latN, latS, lonT, lonW, lonE};
}
// temperature model, trying to follow real-world data
// based on http://www-das.uwyo.edu/~geerts/cwx/notes/chap16/Image64.gif
function calculateTemperatures() {
TIME && console.time("calculateTemperatures");
const cells = grid.cells;
cells.temp = new Int8Array(cells.i.length); // temperature array
const {temperatureEquator, temperatureNorthPole, temperatureSouthPole} = options;
const tropics = [16, -20]; // tropics zone
const tropicalGradient = 0.15;
const tempNorthTropic = temperatureEquator - tropics[0] * tropicalGradient;
const northernGradient = (tempNorthTropic - temperatureNorthPole) / (90 - tropics[0]);
const tempSouthTropic = temperatureEquator + tropics[1] * tropicalGradient;
const southernGradient = (tempSouthTropic - temperatureSouthPole) / (90 + tropics[1]);
const exponent = +heightExponentInput.value;
for (let rowCellId = 0; rowCellId < cells.i.length; rowCellId += grid.cellsX) {
const [, y] = grid.points[rowCellId];
const rowLatitude = mapCoordinates.latN - (y / graphHeight) * mapCoordinates.latT; // [90; -90]
const tempSeaLevel = calculateSeaLevelTemp(rowLatitude);
DEBUG && console.info(`${rn(rowLatitude)}° sea temperature: ${rn(tempSeaLevel)}°C`);
for (let cellId = rowCellId; cellId < rowCellId + grid.cellsX; cellId++) {
const tempAltitudeDrop = getAltitudeTemperatureDrop(cells.h[cellId]);
cells.temp[cellId] = minmax(tempSeaLevel - tempAltitudeDrop, -128, 127);
}
}
function calculateSeaLevelTemp(latitude) {
const isTropical = latitude <= 16 && latitude >= -20;
if (isTropical) return temperatureEquator - Math.abs(latitude) * tropicalGradient;
return latitude > 0
? tempNorthTropic - (latitude - tropics[0]) * northernGradient
: tempSouthTropic + (latitude - tropics[1]) * southernGradient;
}
// temperature drops by 6.5°C per 1km of altitude
function getAltitudeTemperatureDrop(h) {