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