From 03de6f3519df77bcc7dca8cd3fd80f3be861a880 Mon Sep 17 00:00:00 2001
From: callebtc <93376500+callebtc@users.noreply.github.com>
Date: Wed, 29 Jul 2026 20:21:12 +0200
Subject: [PATCH] fix: allow targeting polar geohashes
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Relaxes the view-center clamp from ±80° to ±89°. Previously opening or
tapping a geohash above 80°N/S clamped the fly-in and syncSelection()
encoded the clamped center, silently returning a different cell than
the user picked. Verified with p2 (87°N) and p6 (85°S) cells: the view
now centers on the requested cell and selects it correctly.
---
 .../java/com/bitchat/android/ui/globe/GlobeState.kt   | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/app/src/main/java/com/bitchat/android/ui/globe/GlobeState.kt b/app/src/main/java/com/bitchat/android/ui/globe/GlobeState.kt
index f50a33ff..6908c716 100644
--- a/app/src/main/java/com/bitchat/android/ui/globe/GlobeState.kt
+++ b/app/src/main/java/com/bitchat/android/ui/globe/GlobeState.kt
@@ -76,7 +76,7 @@ class GlobeState(
         if (r <= 0f) return
         val degPerPx = 180.0 / (Math.PI * r)
         centerLon = GlobeMath.normalizeLon(centerLon - dxPx * degPerPx).toFloat()
-        centerLat = (centerLat + dyPx * degPerPx).toFloat().coerceIn(-80f, 80f)
+        centerLat = (centerLat + dyPx * degPerPx).toFloat().coerceIn(MIN_LAT, MAX_LAT)
         syncSelection()
     }
 
@@ -112,7 +112,7 @@ class GlobeState(
             val anim = Animatable(0f)
             anim.animateTo(1f, tween(durationMs, easing = FastOutSlowInEasing)) {
                 val t = value
-                centerLat = (startLat + (lat.toFloat() - startLat) * t).coerceIn(-80f, 80f)
+                centerLat = (startLat + (lat.toFloat() - startLat) * t).coerceIn(MIN_LAT, MAX_LAT)
                 centerLon = GlobeMath.normalizeLon(startLon + dLon * t).toFloat()
                 // exponential interpolation feels natural for zoom
                 zoom = startZoom * (endZoom / startZoom).pow(t)
@@ -170,6 +170,13 @@ class GlobeState(
         animJob?.cancel()
     }
 
+    private companion object {
+        // Close to the projection limit so polar geohash cells remain selectable;
+        // clamping tighter would make syncSelection() encode the wrong cell.
+        const val MIN_LAT = -89f
+        const val MAX_LAT = 89f
+    }
+
     private fun syncSelection() {
         if (baseRadiusPx <= 0f) return
         val gh = Geohash.encode(centerLat.toDouble(), centerLon.toDouble(), precision)