Fixed reversing

app/src/main/java/com/mirenkov/ktheightmap/KhmParser.kt

@@ -20,9 +20,6 @@ class KhmParser {
         private var header: HeightInfo? = null
         const val HEIGHT_FILE: String = "height.khm"
 
-        @OptIn(ExperimentalUnsignedTypes::class)
-        var cachedHeights: Pair<UShortArray, Array<Pair<Float, Float>>>? = null
-
         fun load(filePath: String, ctx: Context) {
             if (ctx.getFileStreamPath(HEIGHT_FILE).exists()) {
                 return
@@ -84,11 +81,12 @@ class KhmParser {
         @OptIn(ExperimentalUnsignedTypes::class)
         fun getHeightsMul(ctx: Context, coords: Array<Pair<Float, Float>>): Pair<UShortArray, Array<Pair<Float, Float>>> {
             if (coords.isEmpty()) return Pair(ushortArrayOf(), coords)
-            if (cachedHeights != null) return cachedHeights!!
             val dis = DataInputStream(ctx.openFileInput(HEIGHT_FILE))
             dis.use {
                 val header = readHeader(dis)
 
+                val reversed = coords[0].first < coords[coords.size - 1].first
+
                 val glist: MutableMap<Pair<Float, Float>, Int> = mutableMapOf()
 
                 for (coord in coords) {
@@ -113,13 +111,13 @@ class KhmParser {
                     } else break
                 }
 
-                cachedHeights = Pair(UShortArray(coords.size) { i ->
+                return Pair(
+                    UShortArray(coords.size) { i ->
                     if (cutOffsets[i] > 0) {
                         dis.skipBytes(cutOffsets[i])
                         dis.readUnsignedShort().toUShort()
-                    } else 0u
-                }, coords)
-                return cachedHeights!!
+                    } else 0u },
+                    if (reversed) coords else coords.reversed().toTypedArray())
             }
         }
 

app/src/main/java/com/mirenkov/ktheightmap/MapCanvas.kt

@@ -54,11 +54,9 @@ fun MapCanvas(
             .pointerInput(Unit) {
                 detectDragGestures (
                     onDragEnd = {
-                        KhmParser.cachedHeights = null
                         invokeHeightCalc = true
                     },
                     onDragCancel = {
-                        KhmParser.cachedHeights = null
                         invokeHeightCalc = true
                     }
                 ) { _, distance ->
@@ -223,7 +221,8 @@ fun MapCanvas(
                 }
                 val heightPair = KhmParser.getHeightsMul(ctx, array)
                 val heights = heightPair.first
-                val coords = heightPair.second.reversed()
+                val coords = heightPair.second
+
                 for (step in 0 until coords.size) {
                     val stepLat = coords[step].second
                     val stepLon = coords[step].first