Improved GetHeightsMul algorithm

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

@@ -33,6 +33,7 @@ import com.mirenkov.ktheightmap.Config.Companion.MAP_START_OFFSET_X
 import com.mirenkov.ktheightmap.Config.Companion.MAP_START_OFFSET_Y
 import com.mirenkov.ktheightmap.parser.KhmParser
 import kotlin.math.absoluteValue
+import kotlin.math.ceil
 import kotlin.math.floor
 import kotlin.math.min
 import kotlin.math.pow
@@ -257,7 +258,7 @@ fun DrawScope.drawPointInfo(
     val latDiff = lat - pointLat
     val lonDiff = lon - pointLon
     val distance = sqrt((latDiff).pow(2) + (lonDiff).pow(2))
-    val valuesCount = min(floor(distance / valueDistance).toInt(),1000)
+    val valuesCount = min(ceil(distance / valueDistance).toInt(), 1000)
     val array: Array<Pair<Float, Float>> = Array(valuesCount) { step ->
         val interCoef = 1F - step.toFloat() / valuesCount
         Pair(lon - lonDiff * interCoef, lat - latDiff * interCoef)

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

@@ -1,5 +1,6 @@
 package com.mirenkov.ktheightmap
 
+import android.annotation.SuppressLint
 import android.app.Application
 import android.os.Bundle
 import android.widget.Toast
@@ -8,16 +9,27 @@ import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.activity.result.ActivityResultLauncher
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.safeDrawingPadding
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.Button
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.buildAnnotatedString
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.withStyle
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
 import androidx.lifecycle.viewmodel.compose.LocalViewModelStoreOwner
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.mirenkov.ktheightmap.parser.KhmParser
@@ -49,41 +61,76 @@ class SettingsActivity : ComponentActivity() {
     }
 }
 
+@SuppressLint("ShowToast")
 @Composable
 fun SettingsMain(vm: TileViewModel, launcher: ActivityResultLauncher<DocumentFilePickerConfig?>) {
+
     val coroutineScope = rememberCoroutineScope()
     val filePath by remember { FileLoader.filePath }
     val ctx = LocalContext.current
-    val toast = Toast.makeText(ctx, "File parsed.", Toast.LENGTH_LONG)
+    val loadToast = Toast.makeText(ctx, "File successfully loaded.", Toast.LENGTH_LONG)
+    val clearTilesToast = Toast.makeText(ctx, "Tiles removed from database.", Toast.LENGTH_LONG)
+    val clearHeightToast = Toast.makeText(ctx, "Height data removed.", Toast.LENGTH_LONG)
+    val fileSelectorRow = @Composable () {
+            Row(Modifier.fillMaxWidth()) {
+                Button({ launcher.launch(null) }) { Text("Select") }
+                Text("Selected file: none", Modifier.padding(8.dp, 0.dp).align(Alignment.CenterVertically))
+            }
+    }
     KtHeightMapTheme {
-        Column(Modifier.fillMaxSize()
-            .safeDrawingPadding()) {
-            Button({ launcher.launch(null) }) { Text("Select file") }
-            Button({
-                    filePath?.let {
+        Scaffold { paddingValues ->
+            Column(Modifier.padding(paddingValues)) {
+                LabeledSection("Select file:", Modifier.padding(24.dp, 8.dp)) {
+                    fileSelectorRow()
+                }
+                LabeledSection("Load file as...", Modifier.padding(24.dp, 8.dp)) {
+                    Button({ filePath?.let {
                         coroutineScope.launch(Dispatchers.IO) {
                             SasSQLiteParser.processZip(it, vm.repository, ctx)
-                            coroutineScope.launch(Dispatchers.Main) { toast.show() }
+                            coroutineScope.launch(Dispatchers.Main) { loadToast.show() }
                         }
-                    } }
-            ) { Text("Load SQLite") }
-            Button({
-                    filePath?.let {
+                    } }) { Text("SQLite (.zip)") }
+                    Button({ filePath?.let {
                         coroutineScope.launch(Dispatchers.IO) {
                             SasJPEGParser.processZip(it, vm.repository)
-                            coroutineScope.launch(Dispatchers.Main) { toast.show() }
+                            coroutineScope.launch(Dispatchers.Main) { loadToast.show() }
                         }
-                    }
-                },
-            ) { Text("Load JPEG") }
-            Button({
-                    filePath?.let {
+                    } }) { Text("JPEG (.zip)") }
+                    Button({ filePath?.let {
                         KhmParser.load(it, ctx)
-                        toast.show()
-                    } },
-            ) { Text("Load KHM") }
-            Button({ coroutineScope.launch { vm.repository.clearTiles() } }) { Text("Clear tiles") }
-            Button({ KhmParser.clear(ctx) }) { Text("Clear KHM") }
+                        loadToast.show()
+                    } }) { Text("Height data (.khm)") }
+                }
+                LabeledSection("Clear...", Modifier.padding(24.dp, 8.dp)) {
+                    Button({ coroutineScope.launch {
+                        vm.repository.clearTiles()
+                        clearTilesToast.show()
+                    } }) { Text("Tile data") }
+                    Button({
+                        KhmParser.clear(ctx)
+                        clearHeightToast.show()
+                    }) { Text("Height data") }
                 }
             }
         }
+    }
+}
+
+fun labelString(text: String): AnnotatedString {
+    return buildAnnotatedString {
+        withStyle(SpanStyle(fontWeight = FontWeight.Bold, fontSize = 24.sp)) {
+            append(text)
+        }
+    }
+}
+
+@Composable
+fun LabeledSection(text: String, modifier: Modifier = Modifier, content: @Composable () -> Unit) {
+    Column(modifier) {
+        Text(labelString(text))
+        HorizontalDivider()
+        Column(
+            modifier = modifier.fillMaxWidth()
+        ) { content() }
+    }
+}

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

@@ -122,10 +122,14 @@ class KhmParser {
 
                 return Pair(
                     UShortArray(coords.size) { i ->
-                    if (cutOffsets[i] > 0) {
+                    when {
+                        (cutOffsets[i] > 0) -> {
                             dis.skipBytes(cutOffsets[i])
                             dis.readUnsignedShort().toUShort()
-                    } else 0u },
+                        }
+                        (cutOffsets[i] == 0) -> {dis.readUnsignedShort().toUShort()}
+                        else -> 0u
+                    }  },
                     if (reversed) coords else coords.reversed().toTypedArray())
             }
         }