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prototype for ice seperation

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StempunkDev 2026-01-12 20:47:03 +01:00
parent f30ffd812e
commit 7f99323d22
9 changed files with 322 additions and 106 deletions
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57
public/modules/ui/layers.js
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@ -420,42 +420,31 @@ function toggleIce(event) {
function drawIce() {
TIME && console.time("drawIce");
const {cells, features} = grid;
const {temp, h} = cells;
Math.random = aleaPRNG(seed);
// Clear existing ice SVG
ice.selectAll("*").remove();
const ICEBERG_MAX_TEMP = 0;
const GLACIER_MAX_TEMP = -8;
const minMaxTemp = d3.min(temp);
// Draw glaciers
pack.ice.glaciers.forEach((glacier, index) => {
ice
.append("polygon")
.attr("points", glacier.points)
.attr("type", "iceShield")
.attr("data-index", index)
.attr("class", "glacier")
.attr("transform", glacier.offset ? `translate(${glacier.offset[0]},${glacier.offset[1]})` : null);
});
// cold land: draw glaciers
{
const type = "iceShield";
const getType = cellId => (h[cellId] >= 20 && temp[cellId] <= GLACIER_MAX_TEMP ? type : null);
const isolines = getIsolines(grid, getType, {polygons: true});
isolines[type]?.polygons?.forEach(points => {
const clipped = clipPoly(points);
ice.append("polygon").attr("points", clipped).attr("type", type);
});
}
// cold water: draw icebergs
for (const cellId of grid.cells.i) {
const t = temp[cellId];
if (h[cellId] >= 20) continue; // no icebergs on land
if (t > ICEBERG_MAX_TEMP) continue; // too warm: no icebergs
if (features[cells.f[cellId]].type === "lake") continue; // no icebers on lakes
if (P(0.8)) continue; // skip most of eligible cells
const randomFactor = 0.8 + rand() * 0.4; // random size factor
let baseSize = (1 - normalize(t, minMaxTemp, 1)) * 0.8; // size: 0 = zero size, 1 = full size
if (cells.t[cellId] === -1) baseSize /= 1.3; // coasline: smaller icebergs
const size = minmax(rn(baseSize * randomFactor, 2), 0.1, 1);
const [cx, cy] = grid.points[cellId];
const points = getGridPolygon(cellId).map(([x, y]) => [rn(lerp(cx, x, size), 2), rn(lerp(cy, y, size), 2)]);
ice.append("polygon").attr("points", points).attr("cell", cellId).attr("size", size);
}
// Draw icebergs
pack.ice.icebergs.forEach((iceberg, index) => {
ice
.append("polygon")
.attr("points", iceberg.points)
.attr("cell", iceberg.cellId)
.attr("size", iceberg.size)
.attr("data-index", index)
.attr("class", "iceberg")
.attr("transform", iceberg.offset ? `translate(${iceberg.offset[0]},${iceberg.offset[1]})` : null);
});
TIME && console.timeEnd("drawIce");
}