Fix invalid center point of BoundingBoxE6.NULL_BOX

Author: bailuk

aat-lib/src/main/java/ch/bailu/aat_lib/coordinates/BoundingBoxE6.kt

@@ -141,7 +141,11 @@ class BoundingBoxE6 {
     val longitudeSpanE6: Int
         get() = abs(lonWestE6 - lonEastE6)
     val center: LatLongE6
-        get() = LatLongE6(latSouthE6 + latitudeSpanE6 / 2, lonWestE6 + longitudeSpanE6 / 2)
+        get() {
+            val la = validate(latSouthE6 + latitudeSpanE6 / 2, MIN_LA, MAX_LA)
+            val lo = validate(lonWestE6 + longitudeSpanE6 / 2, MIN_LO, MAX_LO)
+            return LatLongE6(la, lo)
+        }
 
     private fun validate() {
         latNorthE6 = validate(latNorthE6, MIN_LA, MAX_LA)

aat-lib/src/main/java/ch/bailu/aat_lib/service/directory/GpxInformationDbSummary.kt

@@ -38,11 +38,7 @@ class GpxInformationDbSummary(private val directory: Foc, cursor: DbResultSet) :
     }
 
     private fun addEntryToList(entry: GpxInformation) {
-        val point = GpxPoint(
-            entry.getBoundingBox().center,
-            0f, entry.getTimeStamp()
-        )
-
+        val point = GpxPoint(entry.getBoundingBox().center, 0f, entry.getTimeStamp())
         list.appendToCurrentSegment(point, GpxAttributesNull.NULL)
         maxSpeed.add(entry.getSpeed())
     }

aat-lib/src/test/kotlin/ch/bailu/aat_lib/coordinates/BoundingE6Test.kt

@@ -20,5 +20,19 @@ class BoundingE6Test {
     fun nullBounding() {
         val boundingBoxE6 = BoundingBoxE6.NULL_BOX
         assertEquals(false, boundingBoxE6.hasBounding())
+
+        val center = boundingBoxE6.center
+        val boundingBox = boundingBoxE6.toBoundingBox()
+        val center1 = boundingBox.centerPoint
+        assertEquals(0, center1.latitudeE6)
+        assertEquals(0, center1.longitudeE6)
+        assertEquals(0.0, center1.latitude)
+        assertEquals(0.0, center1.longitude)
+
+        val center2 = center.toLatLong()
+        assertEquals(90000000, center2.latitudeE6)
+        assertEquals(180000000, center2.longitudeE6)
+        assertEquals(90.0, center2.latitude)
+        assertEquals(180.0, center2.longitude)
     }
 }