Fix nullable LatLng? crash in ParticleWindView

MapLibre 13.0.1 types VisibleRegion corners as LatLng? (nullable).
Use listOfNotNull() in both onDraw() and scatter() to guard against
null corners — mirrors the same fix already applied to MainActivity.

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

1 files changed, 12 insertions, 8 deletions

diff --git a/android-app/app/src/main/kotlin/org/terst/nav/ui/map/ParticleWindView.kt b/android-app/app/src/main/kotlin/org/terst/nav/ui/map/ParticleWindView.kt
index d24d11c..f8122d9 100644
--- a/android-app/app/src/main/kotlin/org/terst/nav/ui/map/ParticleWindView.kt
+++ b/android-app/app/src/main/kotlin/org/terst/nav/ui/map/ParticleWindView.kt
@@ -74,10 +74,12 @@ class ParticleWindView @JvmOverloads constructor(
         lastFrameNs = now
 
         val r = m.projection.visibleRegion
-        val latSouth = minOf(r.nearLeft.latitude, r.nearRight.latitude, r.farLeft.latitude, r.farRight.latitude).toFloat()
-        val latNorth = maxOf(r.nearLeft.latitude, r.nearRight.latitude, r.farLeft.latitude, r.farRight.latitude).toFloat()
-        val lonWest  = minOf(r.nearLeft.longitude, r.nearRight.longitude, r.farLeft.longitude, r.farRight.longitude).toFloat()
-        val lonEast  = maxOf(r.nearLeft.longitude, r.nearRight.longitude, r.farLeft.longitude, r.farRight.longitude).toFloat()
+        val corners = listOfNotNull(r.nearLeft, r.nearRight, r.farLeft, r.farRight)
+        if (corners.size < 4) { postInvalidateOnAnimation(); return }
+        val latSouth = corners.minOf { it.latitude }.toFloat()
+        val latNorth = corners.maxOf { it.latitude }.toFloat()
+        val lonWest  = corners.minOf { it.longitude }.toFloat()
+        val lonEast  = corners.maxOf { it.longitude }.toFloat()
         val latRange = latNorth - latSouth
         val lonRange = lonEast  - lonWest
 
@@ -138,10 +140,12 @@ class ParticleWindView @JvmOverloads constructor(
 
     private fun scatter(m: MapLibreMap) {
         val r = m.projection.visibleRegion
-        val latSouth = minOf(r.nearLeft.latitude, r.nearRight.latitude, r.farLeft.latitude, r.farRight.latitude).toFloat()
-        val latNorth = maxOf(r.nearLeft.latitude, r.nearRight.latitude, r.farLeft.latitude, r.farRight.latitude).toFloat()
-        val lonWest  = minOf(r.nearLeft.longitude, r.nearRight.longitude, r.farLeft.longitude, r.farRight.longitude).toFloat()
-        val lonEast  = maxOf(r.nearLeft.longitude, r.nearRight.longitude, r.farLeft.longitude, r.farRight.longitude).toFloat()
+        val corners = listOfNotNull(r.nearLeft, r.nearRight, r.farLeft, r.farRight)
+        if (corners.size < 4) return
+        val latSouth = corners.minOf { it.latitude }.toFloat()
+        val latNorth = corners.maxOf { it.latitude }.toFloat()
+        val lonWest  = corners.minOf { it.longitude }.toFloat()
+        val lonEast  = corners.maxOf { it.longitude }.toFloat()
         val latRange = latNorth - latSouth
         val lonRange = lonEast  - lonWest
         for (i in 0 until N) {