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fix southern wind

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Azgaar 2021-08-24 18:07:38 +03:00
parent 6a9ba5109e
commit e4fd3a6186
1 changed files with 28 additions and 22 deletions
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50
main.js
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@ -960,41 +960,36 @@ function generatePrecipitation() {
const {cells, cellsX, cellsY} = grid;
cells.prec = new Uint8Array(cells.i.length); // precipitation array
const modifier = precInput.value / 100; // user's input
const {winds} = options;
const MAX_PASSABLE_ELEVATION = 85;
const westerly = [];
const easterly = [];
let southerly = 0;
let northerly = 0;
let westerly = [],
easterly = [],
southerly = 0,
northerly = 0;
const isWest = tier => winds[tier] > 40 && winds[tier] < 140;
const isEast = tier => winds[tier] > 220 && winds[tier] < 320;
const isSouth = tier => winds[tier] > 100 && winds[tier] < 260;
const isNorth = tier => winds[tier] > 280 && winds[tier] < 80;
// latitude bands info
// precipitation modifier per latitude band
// x4 = 0-5 latitude: wet through the year (rising zone)
// x2 = 5-20 latitude: wet summer (rising zone), dry winter (sinking zone)
// x1 = 20-30 latitude: dry all year (sinking zone)
// x2 = 30-50 latitude: wet winter (rising zone), dry summer (sinking zone)
// x3 = 50-60 latitude: wet all year (rising zone)
// x2 = 60-70 latitude: wet summer (rising zone), dry winter (sinking zone)
// x1 = 70-90 latitude: dry all year (sinking zone)
// x1 = 70-85 latitude: dry all year (sinking zone)
// x0.5 = 85-90 latitude: dry all year (sinking zone)
const lalitudeModifier = [4, 2, 2, 2, 1, 1, 2, 2, 2, 2, 3, 3, 2, 2, 1, 1, 1, 0.5];
const MAX_PASSABLE_ELEVATION = 85;
// difine wind directions based on cells latitude and prevailing winds there
// define wind directions based on cells latitude and prevailing winds there
d3.range(0, cells.i.length, cellsX).forEach(function (c, i) {
const lat = mapCoordinates.latN - (i / cellsY) * mapCoordinates.latT;
const band = ((Math.abs(lat) - 1) / 5) | 0;
const latMod = lalitudeModifier[band];
const tier = (Math.abs(lat - 89) / 30) | 0; // 30d tiers from 0 to 5 from N to S
const latBand = ((Math.abs(lat) - 1) / 5) | 0;
const latMod = lalitudeModifier[latBand];
const windTier = (Math.abs(lat - 89) / 30) | 0; // 30d tiers from 0 to 5 from N to S
const {isWest, isEast, isNorth, isSouth} = getWindDirections(windTier);
if (isWest(tier)) westerly.push([c, latMod, tier]);
else if (isEast(tier)) easterly.push([c + cellsX - 1, latMod, tier]);
if (isSouth(tier)) northerly++;
if (isNorth(tier)) southerly++;
if (isWest) westerly.push([c, latMod, windTier]);
if (isEast) easterly.push([c + cellsX - 1, latMod, windTier]);
if (isNorth) northerly++;
if (isSouth) southerly++;
});
// distribute winds by direction
@ -1016,6 +1011,17 @@ function generatePrecipitation() {
passWind(d3.range(cells.i.length - cellsX, cells.i.length, 1), maxPrecS, -cellsX, cellsY);
}
function getWindDirections(tier) {
const angle = options.winds[tier];
const isWest = angle > 40 && angle < 140;
const isEast = angle > 220 && angle < 320;
const isNorth = angle > 100 && angle < 260;
const isSouth = angle > 280 || angle < 80;
return {isWest, isEast, isNorth, isSouth};
}
function passWind(source, maxPrec, next, steps) {
const maxPrecInit = maxPrec;