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CanisArtorus 2021-01-24 21:23:38 -07:00
parent da5a53f0ce
commit 0c7bd9f1ae
1 changed files with 54 additions and 54 deletions
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108
modules/river-generator.js
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@ -37,47 +37,68 @@
const land = cells.i.filter(i => h[i] >= 20).sort((a,b) => h[b] - h[a]);
const lakes = features.filter(f => f.type === "lake" && f.group === "freshwater");
const lakeHeights = lakes.map(l => l.height).sort((a,b) => b - a);
const used = [0];
const flowDown = function(min, iFlux, ri, wetCB = (iFlux, ri, nx, ny) => {}){
if (cells.r[min]) { // downhill cell already has river assigned
if (cells.fl[min] < iFlux) {
cells.conf[min] = cells.fl[min]; // mark confluence
if (h[min] >= 20) riversData.find(r => r.river === cells.r[min]).parent = ri; // min river is a tributary of current river
cells.r[min] = ri; // re-assign river if downhill part has less flux
} else {
cells.conf[min] += iFlux; // mark confluence
if (h[min] >= 20) riversData.find(r => r.river === ri).parent = cells.r[min]; // current river is a tributary of min river
}
} else cells.r[min] = ri; // assign the river to the downhill cell
const nx = p[min][0], ny = p[min][1];
if (h[min] < 20) {
wetCB(iFlux, ri, nx, ny);
} else {
cells.fl[min] += iFlux; // propagate flux
riversData.push({river: ri, cell: min, x: nx, y: ny}); // add next River segment
}
};
land.forEach(function(i) {
while (lakeHeights && h[i] <= lakeHeights[0]){ // drain lakes first
const lh = lakeHeights.shift();
const l = lakes.find(lk => lk.height === lh);
let min = 0;
let outlet = 0;
if (l.shoreline) {
min = l.shoreline[d3.scan(l.shoreline, (a,b) => h[a] - h[b])];
outlet = l.shoreline[d3.scan(l.shoreline, (a,b) => h[a] - h[b])];
} else {
WARN && console.warn('Re-scanning shoreline of a lake');
const shallows = cells.i.filter(i => cells.t[i] === -1 && cells.f[i] === l.i);
const shallows = cells.i.filter(j => cells.t[j] === -1 && cells.f[j] === l.i);
let shoreline = l.firstCell - 1;
shallows.map(w => cells.c[w]).forEach(cList => shoreline += cList);
min = shoreline[d3.scan(shoreline, (a,b) => h[a] - h[b])];
outlet = shoreline[d3.scan(shoreline, (a,b) => h[a] - h[b])];
}
min = min ? min : l.firstCell - 1; // existance guarentee
outlet = outlet ? outlet : l.firstCell - 1; // existance guarentee
let ri = l.river
const i = cells.haven[min];
if (l.totalFlux > l.flux * 2) {
ri = riverNext;
riverNext++;
if(l.cells > 1) {
const j = cells.haven[outlet];
// if (features[cells.f[i]].totalFlux > l.flux * 2) {
ri = ++riverNext;
// } else {
//TODO String the river along to the exit
// }
// assign river to come out of the lake
cells.r[j] = ri;
riversData.push({river: ri, cell: j, x: p[j][0], y: p[j][1]});
}
// assign river to come out of the lake
cells.r[i] = ri;
riversData.push({river: ri, cell: i, x: p[i][0], y: p[i][1]});
flowDown(outlet, features[l.i].totalFlux, ri);
// two segments, so it doesn't return-stub
// lowest land neighbour
let next = cells.c[outlet].filter(c => h[c] >= 20).sort((a,b) => h[a] - h[b])[0];
flowDown(next, cells.fl[outlet], cells.r[outlet]);
used.push(outlet); // is already done
if (cells.r[min]) { // outlet cell already has river assigned
if (cells.fl[min] < l.totalFlux) {
cells.conf[min] = cells.fl[min]; // mark confluence
if (h[min] >= 20) riversData.find(r => r.river === cells.r[min]).parent = ri; // min river is a tributary of current river
cells.r[min] = ri; // re-assign river if downhill part has less flux
} else {
cells.conf[min] += l.totalFlux; // mark confluence
if (h[min] >= 20) riversData.find(r => r.river === ri).parent = cells.r[min]; // current river is a tributary of min river
}
} else cells.r[min] = ri; // assign the river to the downhill cell
cells.fl[min] += l.totalFlux;
riversData.push({river: ri, cell: min, x: p[min][0], y: p[min][1]});
lakes.forEach(l => delete l.shoreline); // cleanup temp passed data
delete l.shoreline; // cleanup temp passed data
}
if (used.includes(i)) { return; }
cells.fl[i] += grid.cells.prec[cells.g[i]]; // flux from precipitation
const x = p[i][0], y = p[i][1];
@ -98,12 +119,6 @@
//const min = cells.c[i][d3.scan(cells.c[i], (a, b) => h[a] - h[b])]; // downhill cell
let min = cells.c[i][d3.scan(cells.c[i], (a, b) => h[a] - h[b])]; // downhill cell
// allow only one river can flow through a lake
// const cf = features[cells.f[i]]; // current cell feature
// if (cf.river && cf.river !== cells.r[i]) {
// cells.fl[i] = 0;
// }
if (cells.fl[i] < 30) {
if (h[min] >= 20) cells.fl[min] += cells.fl[i];
return; // flux is too small to operate as river
@ -116,33 +131,18 @@
riverNext++;
}
if (cells.r[min]) { // downhill cell already has river assigned
if (cells.fl[min] < cells.fl[i]) {
cells.conf[min] = cells.fl[min]; // mark confluence
if (h[min] >= 20) riversData.find(r => r.river === cells.r[min]).parent = cells.r[i]; // min river is a tributary of current river
cells.r[min] = cells.r[i]; // re-assign river if downhill part has less flux
} else {
cells.conf[min] += cells.fl[i]; // mark confluence
if (h[min] >= 20) riversData.find(r => r.river === cells.r[i]).parent = cells.r[min]; // current river is a tributary of min river
}
} else cells.r[min] = cells.r[i]; // assign the river to the downhill cell
const nx = p[min][0], ny = p[min][1];
if (h[min] < 20) {
flowDown(min, cells.fl[i], cells.r[i], (iFlux, ri, nx, ny) => {
// pour water to the sea haven
riversData.push({river: cells.r[i], cell: cells.haven[i], x: nx, y: ny});
riversData.push({river: ri, cell: cells.haven[i], x: nx, y: ny});
const mf = features[cells.f[min]]; // feature of min cell
if (mf.type === "lake") {
if (!mf.river || cells.fl[i] > mf.flux) {
mf.river = cells.r[i]; // pour water to temporaly elevated lake
mf.flux = cells.fl[i]; // entering flux
if (!mf.river || iFlux > mf.flux) {
mf.river = ri; // pour water to temporaly elevated lake
mf.flux = iFlux; // entering flux
}
mf.totalFlux += cells.fl[i];
mf.totalFlux += iFlux;
}
} else {
cells.fl[min] += cells.fl[i]; // propagate flux
riversData.push({river: cells.r[i], cell: min, x: nx, y: ny}); // add next River segment
}
});
});
}()