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Catalin Mititiuc

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authorCatalin Mititiuc <webdevcat@proton.me>2024-06-16 22:53:55 -0700
committerCatalin Mititiuc <webdevcat@proton.me>2024-06-16 23:25:38 -0700
commit0a30f7c7efe31f84f7ac33435a6c5c52ac14579d (patch)
treeb04b529715e1f1f0a97e065639d714252f824056 /src/radial.js
parent07ab30fdecfce4ede25e2403fa66a07685eccd4e (diff)
WIP: radial hex grid
Diffstat (limited to 'src/radial.js')
-rw-r--r--src/radial.js96
1 files changed, 96 insertions, 0 deletions
diff --git a/src/radial.js b/src/radial.js
new file mode 100644
index 0000000..98ae53d
--- /dev/null
+++ b/src/radial.js
@@ -0,0 +1,96 @@
+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));
+});