From 3443c1c65e9f1753e1e656b35d08416c1fa298f2 Mon Sep 17 00:00:00 2001
From: godosa <godosa@godosa.eu>
Date: Wed, 7 Oct 2026 00:14:38 +0200
Subject: worldmap-viewer: initial public history

---
 viewer/js/vents.js | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 viewer/js/vents.js

(limited to 'viewer/js/vents.js')

diff --git a/viewer/js/vents.js b/viewer/js/vents.js
new file mode 100644
index 0000000..34eedfc
--- /dev/null
+++ b/viewer/js/vents.js
@@ -0,0 +1,25 @@
+// vents.js — hydrothermal vents as map markers (pure): clusters on a lat/lon grid sized to ≈ px screen pixels
+import { R_KM } from './geo.js';
+
+const FLOW = ['weak flow', 'steady flow', 'strong flow'];
+
+export const zoomBucket = kmPerPx => Math.floor(Math.log(kmPerPx) / Math.log(1.5));
+
+export function clusterVents(vents, kmPerPx, px = 40) {
+  const deg = Math.max(1e-6, (kmPerPx * px * 180) / (Math.PI * R_KM));
+  const cells = new Map();
+  for (const v of vents) {
+    const key = `${Math.floor(v.lat / deg)}:${Math.floor(v.lon / deg)}`;
+    const c = cells.get(key);
+    if (c) {
+      c.lat += v.lat;
+      c.lon += v.lon;
+      c.n++;
+    } else cells.set(key, { lat: v.lat, lon: v.lon, n: 1, v });
+  }
+  return [...cells.values()].map(c => (c.n === 1 ? c : { lat: c.lat / c.n, lon: c.lon / c.n, n: c.n, v: null }));
+}
+
+export function ventText(v, types, minerals) {
+  return `${types[v.type] ?? 'vent'} · ${Math.round(v.temp_c)} °C · ${minerals[v.mineral] ?? '?'} · ${FLOW[v.flow] ?? ''}`;
+}
-- 
cgit