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alternative grid generators

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GoteGuru 2022-06-08 01:10:13 +02:00
parent 8735ca8a3e
commit 3827a50bee
3 changed files with 70 additions and 8 deletions
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61
utils/graphUtils.js
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@ -2,7 +2,7 @@
// FMG utils related to graph
// check if new grid graph should be generated or we can use the existing one
function shouldRegenerateGrid(grid) {
function shouldRegenerateGrid(grid, method) {
const cellsDesired = +byId("pointsInput").dataset.cells;
if (cellsDesired !== grid.cellsDesired) return true;
@ -10,21 +10,22 @@ function shouldRegenerateGrid(grid) {
const newCellsX = Math.floor((graphWidth + 0.5 * newSpacing - 1e-10) / newSpacing);
const newCellsY = Math.floor((graphHeight + 0.5 * newSpacing - 1e-10) / newSpacing);
return grid.spacing !== newSpacing || grid.cellsX !== newCellsX || grid.cellsY !== newCellsY;
return grid.generator !== method || grid.spacing !== newSpacing || grid.cellsX !== newCellsX || grid.cellsY !== newCellsY;
}
function generateGrid() {
function generateGrid(generator = voronoiPoints) {
Math.random = aleaPRNG(seed); // reset PRNG
const {spacing, cellsDesired, boundary, points, cellsX, cellsY} = placePoints();
//const {spacing, cellsDesired, boundary, points, cellsX, cellsY} = placePoints();
const {spacing, cellsDesired, boundary, points, cellsX, cellsY} = generator();
const {cells, vertices} = calculateVoronoi(points, boundary);
return {spacing, cellsDesired, boundary, points, cellsX, cellsY, cells, vertices};
return {spacing, cellsDesired, boundary, points, cellsX, cellsY, cells, vertices, generator};
}
// place random points to calculate Voronoi diagram
function placePoints() {
function voronoiPoints() {
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 spacing = rn(Math.sqrt((graphWidth * graphHeight) / cellsDesired), 2); // spacing between points before jittering
const boundary = getBoundaryPoints(graphWidth, graphHeight, spacing);
const points = getJitteredGrid(graphWidth, graphHeight, spacing); // points of jittered square grid
@ -35,6 +36,52 @@ function placePoints() {
return {spacing, cellsDesired, boundary, points, cellsX, cellsY};
}
// alternatively generate hex-grid
function hexPoints() {
TIME && console.time("hexPoints");
const cellsDesired = +byId("pointsInput").dataset.cells;
const hexRatio = 0.86602540378;
const spacing = rn(Math.sqrt(graphWidth * graphHeight / hexRatio / cellsDesired), 2); // spacing between points
const lineOffset = spacing * hexRatio;
const boundary = getBoundaryPoints(graphWidth, graphHeight, spacing);
const cellsX = Math.floor((graphWidth + 0.5 * spacing - 1e-10) / spacing);
const cellsY = Math.floor((graphHeight + 0.5 * lineOffset - 1e-10) / lineOffset);
console.log('desired hexgrid:', cellsX, cellsY);
let points = [];
for (let y = lineOffset / 2, lc = 0 ; y < graphHeight; y += lineOffset, lc++) {
for (let x = lc % 2 ? 0 : spacing / 2; x < graphWidth; x += spacing) {
points.push([x, y]);
}
}
TIME && console.timeEnd("hexPoints");
return {spacing, cellsDesired, boundary, points, cellsX, cellsY};
}
// square grid
function squarePoints() {
TIME && console.time("squarePoints");
const cellsDesired = +byId("pointsInput").dataset.cells;
const spacing = rn(Math.sqrt((graphWidth * graphHeight) / cellsDesired), 2);
const boundary = getBoundaryPoints(graphWidth, graphHeight, spacing);
const cellsX = Math.floor((graphWidth + 0.5 * spacing - 1e-10) / spacing);
const cellsY = Math.floor((graphHeight + 0.5 * spacing - 1e-10) / spacing);
const radius = spacing / 2;
let points = [];
for (let y = radius; y < graphHeight; y += spacing)
for (let x = radius; x < graphWidth; x += spacing)
points.push([x, y]);
TIME && console.timeEnd("squarePoints");
return {spacing, cellsDesired, boundary, points, cellsX, cellsY};
}
// calculate Delaunay and then Voronoi diagram
function calculateVoronoi(points, boundary) {
TIME && console.time("calculateDelaunay");