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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.
This commit is contained in:
callebtc 2026-07-29 20:21:12 +02:00
parent 79bf154ce3
commit 03de6f3519
1 changed files with 9 additions and 2 deletions
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11
app/src/main/java/com/bitchat/android/ui/globe/GlobeState.kt
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@ -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)