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refactor: grid generation

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Azgaar 2022-07-11 01:38:55 +03:00
parent d18636eb8f
commit e59b536e83
15 changed files with 157 additions and 105 deletions
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18
src/modules/precipitation.js
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@ -5,11 +5,12 @@ import {minmax} from "utils/numberUtils";
import {rand} from "utils/probabilityUtils";
// simplest precipitation model
export function generatePrecipitation() {
export function generatePrecipitation(grid) {
TIME && console.time("generatePrecipitation");
prec.selectAll("*").remove();
const {cells, cellsX, cellsY} = grid;
cells.prec = new Uint8Array(cells.i.length); // precipitation array
const precipitation = new Uint8Array(cells.i.length); // precipitation array
const cellsNumberModifier = (pointsInput.dataset.cells / 10000) ** 0.25;
const precInputModifier = precInput.value / 100;
@ -94,20 +95,20 @@ export function generatePrecipitation() {
if (cells.h[current] < 20) {
// water cell
if (cells.h[current + next] >= 20) {
cells.prec[current + next] += Math.max(humidity / rand(10, 20), 1); // coastal precipitation
precipitation[current + next] += Math.max(humidity / rand(10, 20), 1); // coastal precipitation
} else {
humidity = Math.min(humidity + 5 * modifier, maxPrec); // wind gets more humidity passing water cell
cells.prec[current] += 5 * modifier; // water cells precipitation (need to correctly pour water through lakes)
precipitation[current] += 5 * modifier; // water cells precipitation (need to correctly pour water through lakes)
}
continue;
}
// land cell
const isPassable = cells.h[current + next] <= MAX_PASSABLE_ELEVATION;
const precipitation = isPassable ? getPrecipitation(humidity, current, next) : humidity;
cells.prec[current] += precipitation;
const evaporation = precipitation > 1.5 ? 1 : 0; // some humidity evaporates back to the atmosphere
humidity = isPassable ? minmax(humidity - precipitation + evaporation, 0, maxPrec) : 0;
const cellPrec = isPassable ? getPrecipitation(humidity, current, next) : humidity;
precipitation[current] += cellPrec;
const evaporation = cellPrec > 1.5 ? 1 : 0; // some humidity evaporates back to the atmosphere
humidity = isPassable ? minmax(humidity - cellPrec + evaporation, 0, maxPrec) : 0;
}
}
}
@ -162,4 +163,5 @@ export function generatePrecipitation() {
})();
TIME && console.timeEnd("generatePrecipitation");
return precipitation;
}