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WIP: radial hex grid

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Catalin Constantin Mititiuc 2025-06-16 22:41:31 -07:00
parent 515323feaa
commit df21cd8271
2 changed files with 127 additions and 0 deletions
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31
public/radial.html Normal file
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<!DOCTYPE html>
<html>
<head>
<style>
polygon {
fill: none;
stroke: black;
stroke-width: 0.5px;
}
svg {
border: 1px solid slategray;
}
text {
font-size: 4px;
text-anchor: middle;
user-select: none;
font-family: sans-serif;
}
</style>
</head>
<body>
<svg viewBox="-150 -100 300 200" xmlns="http://www.w3.org/2000/svg">
<defs>
<polygon id="hex" points="0,10 8.66,5 8.66,-5 0,-10 -8.66,-5 -8.66,5"/>
</defs>
</svg>
<script src="radial.js"></script>
</body>
</html>

96
src/radial.js Normal file
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if (window.IS_DEV) {
const source = new EventSource('/esbuild');
source.addEventListener('change', () => location.reload());
}
function toKey(q, r, s) {
return `${[q, r, s]}`;
}
function getNeighbors(coords) {
const [q, r, s] = coords.split(',').map(n => +n);
return [
toKey(q + 1, r, s - 1),
toKey(q - 1, r, s + 1),
toKey(q + 1, r - 1, s),
toKey(q - 1, r + 1, s),
toKey(q, r + 1, s - 1),
toKey(q, r - 1, s + 1),
]
}
function generateRadialCoords({ q, r, s }, radius) {
const origin = toKey(q, r, s);
const list = new Set();
const neighbors = new Set();
let next = new Set();
list.add(origin);
next.add(origin);
for (let i = 0; i < radius; i++) {
next.forEach(coords => {
getNeighbors(coords).forEach(n => {
list.add(n);
neighbors.add(n);
});
});
next = new Set(neighbors);
neighbors.clear();
}
return list;
}
const hex = {
inradius: 8.66,
circumradius: 10,
}
const horzSpacing = hex.inradius;
const vertSpacing = hex.circumradius * 3 / 2;
const list = generateRadialCoords({ q: 0, r: 0, s: 0 }, 5);
const svg = document.querySelector('svg');
const xmlns = 'http://www.w3.org/2000/svg';
list.forEach(key => {
const [q, r, s] = key.split(',').map(n => +n);
let x;
if (q === s)
x = 0;
else if (q > -1 && s > -1 || q < 0 && s < 0)
x = Math.abs(q - s);
else
x = Math.abs(q) + Math.abs(s);
x = (q > s ? -1 : 1) * x * horzSpacing;
y = r * vertSpacing;
const use = document.createElementNS(xmlns, 'use');
use.setAttributeNS(null, 'href', '#hex');
use.setAttributeNS(null, 'x', x);
use.setAttributeNS(null, 'y', y);
const qText = document.createElementNS(xmlns, 'text');
qText.textContent = q;
qText.setAttributeNS(null, 'x', x - 3);
qText.setAttributeNS(null, 'y', y - 3);
const rText = document.createElementNS(xmlns, 'text');
rText.textContent = r;
rText.setAttributeNS(null, 'x', x + 5);
rText.setAttributeNS(null, 'y', y + 1.5);
const sText = document.createElementNS(xmlns, 'text');
sText.textContent = s;
sText.setAttributeNS(null, 'x', x - 3);
sText.setAttributeNS(null, 'y', y + 5);
[use, qText, rText, sText].forEach(el => svg.appendChild(el));
});