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river type - memoize what is small size for river

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Azgaar 2021-07-23 20:48:38 +03:00
parent 50f497c62a
commit 4902a321ea
2 changed files with 15 additions and 11 deletions
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23
modules/river-generator.js
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@ -388,14 +388,11 @@
const specify = function () {
const rivers = pack.rivers;
if (!rivers.length) return;
Math.random = aleaPRNG(seed);
const thresholdElement = Math.ceil(rivers.length * 0.15);
const smallLength = rivers.map(r => r.length || 0).sort((a, b) => a - b)[thresholdElement];
for (const r of rivers) {
r.basin = getBasin(r.i);
r.name = getName(r.mouth);
r.type = getType(r, r.length < smallLength);
for (const river of rivers) {
river.basin = getBasin(river.i);
river.name = getName(river.mouth);
river.type = getType(river);
}
};
@ -414,8 +411,16 @@
small: {Branch: 1}
}
};
const getType = function (river, isSmall) {
const isFork = each(3)(river.i) && river.parent && river.parent !== river.i;
let smallLength = null;
const getType = function ({i, length, parent}) {
if (smallLength === null) {
const threshold = Math.ceil(pack.rivers.length * 0.15);
smallLength = pack.rivers.map(r => r.length || 0).sort((a, b) => a - b)[threshold];
}
const isSmall = length < smallLength;
const isFork = each(3)(i) && parent && parent !== i;
return rw(riverTypes[isFork ? "fork" : "main"][isSmall ? "small" : "big"]);
};