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feat: alternative point samplers WIP

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Azgaar 2024-07-15 22:21:04 +02:00
parent df4d80bb86
commit 62fa8d517b
7 changed files with 200 additions and 79 deletions
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63
utils/graphUtils.js
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@ -8,6 +8,9 @@ function shouldRegenerateGrid(grid, expectedSeed) {
const cellsDesired = +byId("pointsInput").dataset.cells;
if (cellsDesired !== grid.cellsDesired) return true;
const gridType = byId("gridType").value;
if (gridType !== grid.type) return true;
const newSpacing = rn(Math.sqrt((graphWidth * graphHeight) / cellsDesired), 2);
const newCellsX = Math.floor((graphWidth + 0.5 * newSpacing - 1e-10) / newSpacing);
const newCellsY = Math.floor((graphHeight + 0.5 * newSpacing - 1e-10) / newSpacing);
@ -17,24 +20,9 @@ function shouldRegenerateGrid(grid, expectedSeed) {
function generateGrid() {
Math.random = aleaPRNG(seed); // reset PRNG
const {spacing, cellsDesired, boundary, points, cellsX, cellsY} = placePoints();
const {spacing, cellsDesired, type, boundary, points, cellsX, cellsY} = generatePoints();
const {cells, vertices} = calculateVoronoi(points, boundary);
return {spacing, cellsDesired, boundary, points, cellsX, cellsY, cells, vertices, seed};
}
// place random points to calculate Voronoi diagram
function placePoints() {
TIME && console.time("placePoints");
const cellsDesired = +byId("pointsInput").dataset.cells;
const spacing = rn(Math.sqrt((graphWidth * graphHeight) / cellsDesired), 2); // spacing between points before jirrering
const boundary = getBoundaryPoints(graphWidth, graphHeight, spacing);
const points = getJitteredGrid(graphWidth, graphHeight, spacing); // points of jittered square grid
const cellsX = Math.floor((graphWidth + 0.5 * spacing - 1e-10) / spacing);
const cellsY = Math.floor((graphHeight + 0.5 * spacing - 1e-10) / spacing);
TIME && console.timeEnd("placePoints");
return {spacing, cellsDesired, boundary, points, cellsX, cellsY};
return {spacing, cellsDesired, type, boundary, points, cellsX, cellsY, cells, vertices, seed};
}
// calculate Delaunay and then Voronoi diagram
@ -55,47 +43,6 @@ function calculateVoronoi(points, boundary) {
return {cells, vertices};
}
// add points along map edge to pseudo-clip voronoi cells
function getBoundaryPoints(width, height, spacing) {
const offset = rn(-1 * spacing);
const bSpacing = spacing * 2;
const w = width - offset * 2;
const h = height - offset * 2;
const numberX = Math.ceil(w / bSpacing) - 1;
const numberY = Math.ceil(h / bSpacing) - 1;
const points = [];
for (let i = 0.5; i < numberX; i++) {
let x = Math.ceil((w * i) / numberX + offset);
points.push([x, offset], [x, h + offset]);
}
for (let i = 0.5; i < numberY; i++) {
let y = Math.ceil((h * i) / numberY + offset);
points.push([offset, y], [w + offset, y]);
}
return points;
}
// get points on a regular square grid and jitter them a bit
function getJitteredGrid(width, height, spacing) {
const radius = spacing / 2; // square radius
const jittering = radius * 0.9; // max deviation
const doubleJittering = jittering * 2;
const jitter = () => Math.random() * doubleJittering - jittering;
let points = [];
for (let y = radius; y < height; y += spacing) {
for (let x = radius; x < width; x += spacing) {
const xj = Math.min(rn(x + jitter(), 2), width);
const yj = Math.min(rn(y + jitter(), 2), height);
points.push([xj, yj]);
}
}
return points;
}
// return cell index on a regular square grid
function findGridCell(x, y, grid) {
return (