Dropdown menu and almost proper debugging

.idea/deploymentTargetSelector.xml

@@ -4,7 +4,7 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
-        <DropdownSelection timestamp="2025-08-25T12:35:44.992136184Z">
+        <DropdownSelection timestamp="2025-08-26T11:06:03.805342749Z">
           <Target type="DEFAULT_BOOT">
             <handle>
               <DeviceId pluginId="LocalEmulator" identifier="path=/home/secondbeam/.config/.android/avd/Virtual_Pixel_3.avd" />

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

@@ -15,6 +15,8 @@ import androidx.compose.foundation.layout.safeDrawingPadding
 import androidx.compose.foundation.layout.size
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Build
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
 import androidx.compose.material3.FloatingActionButton
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme.colorScheme
@@ -22,9 +24,13 @@ import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Slider
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.rotate
@@ -73,6 +79,8 @@ class MainActivity : ComponentActivity() {
 @Composable
 fun Main(vm: TileViewModel = viewModel()) {
     val sliderValue = rememberSaveable { mutableFloatStateOf(1F) }
+    val canvasOffsetX = rememberSaveable { mutableFloatStateOf(-652.0647F) }
+    val canvasOffsetY = rememberSaveable { mutableFloatStateOf(-1145.693F) }
     val coroutineScope = rememberCoroutineScope()
     val tileContainer = TileContainer(vm, coroutineScope)
     KtHeightMapTheme {
@@ -81,13 +89,16 @@ fun Main(vm: TileViewModel = viewModel()) {
                 modifier = Modifier.fillMaxSize()
                     .safeDrawingPadding()
                     .align(Alignment.Center),
-                floatingActionButton = { ToolButton() }
+                floatingActionButton = { ToolButton(vm) }
             ) { innerPadding ->
                 MapCanvas(
+                    viewModel = vm,
                     gridColor = colorScheme.primary,
                     backColor = colorScheme.background,
                     scale = sliderValue,
                     tileContainer = tileContainer,
+                    offsetX = canvasOffsetX,
+                    offsetY = canvasOffsetY,
                     modifier = Modifier.padding(innerPadding),
                 )
             }
@@ -100,7 +111,7 @@ fun Main(vm: TileViewModel = viewModel()) {
                 Slider(
                     value = sliderValue.floatValue,
                     onValueChange = { sliderValue.floatValue = it },
-                    valueRange = 2F..14F,
+                    valueRange = 1F..14F,
                     modifier = Modifier.align(Alignment.CenterStart)
                 )
             }
@@ -109,33 +120,38 @@ fun Main(vm: TileViewModel = viewModel()) {
 }
 
 @Composable
-fun ToolButton() {
+fun ToolButton(viewModel: TileViewModel) {
     val context = LocalContext.current
+    var expanded by remember{ mutableStateOf(false) }
     FloatingActionButton(
+        onClick = {
+            expanded = !expanded
+        }
+    ) {
+        Icon(Icons.Filled.Build, contentDescription = "Tools")
+        DropdownMenu(
+            expanded = expanded,
+            onDismissRequest = { expanded = false }
+        ) {
+            DropdownMenuItem(
+                text = { Text("Toggle debug") },
+                onClick = { viewModel.debug = !viewModel.debug }
+            )
+            DropdownMenuItem(
+                text = { Text("Log") },
+                onClick = { viewModel.logRequested = true }
+            )
+            DropdownMenuItem(
+                text = { Text("Set location") },
+                onClick = {}
+            )
+            DropdownMenuItem(
+                text = { Text("Settings") },
                 onClick = {
                     val intent = Intent(context, SettingsActivity::class.java)
                     context.startActivity(intent)
                 }
-    ) { Icon(Icons.Filled.Build, contentDescription = "Tools") }
-}
-
-@Preview(showBackground = true)
-@Composable
-fun MainPreview() {
-    KtHeightMapTheme {
-        Scaffold(
-            modifier = Modifier.safeDrawingPadding(),
-            floatingActionButton = { ToolButton() }
-        ) { innerPadding ->
-            Box(
-                modifier = Modifier.padding(innerPadding)
-                    .fillMaxSize(),
-                contentAlignment = Alignment.Center
-            ) {
-                Text(
-                    text = "Gryadki"
             )
         }
     }
 }
-}

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

@@ -1,6 +1,8 @@
 package com.mirenkov.ktheightmap
 
+import android.util.Log
 import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.gestures.detectDragGestures
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.runtime.Composable
@@ -28,14 +30,18 @@ import kotlin.math.absoluteValue
 
 @Composable
 fun MapCanvas(
+    viewModel: TileViewModel,
     backColor: Color,
     gridColor: Color,
     scale: MutableFloatState,
+    offsetX: MutableFloatState,
+    offsetY: MutableFloatState,
     tileContainer: TileContainer,
     modifier: Modifier = Modifier
 ) {
-    var offsetX by rememberSaveable { mutableFloatStateOf(-TILE_SIZE) }
+    var offsetX by rememberSaveable { offsetX }
-    var offsetY by rememberSaveable { mutableFloatStateOf(-TILE_SIZE) }
+    var offsetY by rememberSaveable { offsetY }
+    val scale by rememberSaveable { scale }
     val textMeasurer = rememberTextMeasurer()
     Canvas(
         modifier = modifier.fillMaxSize()
@@ -50,8 +56,14 @@ fun MapCanvas(
             color = backColor,
             size = size
         )
+
+        if (viewModel.logRequested) {
+            Log.i(TAG, "Offset: %.6f, %.6f".format(offsetX, offsetY))
+            viewModel.logRequested = false
+        }
+
         val oldLevel = tileContainer.getLevel()
-        val level = scale.floatValue.toInt()
+        val level = scale.toInt()
         val levelDiff = level - oldLevel
 
         if (levelDiff < 0) {
@@ -72,6 +84,9 @@ fun MapCanvas(
         val tileOffsetX = (offsetX / TILE_SIZE).toInt()
         val tileOffsetY = (offsetY / TILE_SIZE).toInt()
 
+        val centerTileX = (1 + (offsetX + size.width / 2) / TILE_SIZE).toDouble()
+        val centerTileY = (1 + (offsetY + size.height / 2) / TILE_SIZE).toDouble()
+
         val strippedOffsetX = offsetX % TILE_SIZE
         val strippedOffsetY = offsetY % TILE_SIZE
 
@@ -86,6 +101,10 @@ fun MapCanvas(
 
         val crossRadius = 24F
 
+        val additionalSize = if (viewModel.debug) 96F else 0F
+        val latLonSize = Size(196F, 96F + additionalSize)
+        val latLonOffset = Offset(16F, 16F)
+
         for (cellX in 0 .. gridWidth + 2) {
             val tileX = tileOffsetX + cellX
             val localOffsetX = TILE_SIZE * (cellX - 1)
@@ -105,6 +124,7 @@ fun MapCanvas(
                     )
                 }
 
+                if (viewModel.debug) {
                     drawRect(
                         color = gridColor,
                         size = Size(TILE_SIZE, TILE_SIZE),
@@ -126,6 +146,7 @@ fun MapCanvas(
                         topLeft = totalOffset,
                         size = Size(TILE_SIZE, TILE_SIZE)
                     )
+                }
 
                 val path = Path()
                 path.moveTo(size.width / 2 - crossRadius, size.height / 2)
@@ -139,6 +160,30 @@ fun MapCanvas(
                     Color.White,
                     style = Stroke(width = 6F)
                 )
+
+                drawRect(
+                    color = backColor,
+                    size = latLonSize,
+                    topLeft = latLonOffset
+                )
+
+                drawText(
+                    textMeasurer = textMeasurer,
+                    text = buildAnnotatedString {
+                        withStyle(ParagraphStyle(textAlign = TextAlign.Center)) {
+                            withStyle(SpanStyle(color = gridColor)) {
+                                val lon = SphereMercator.mercateX(centerTileX, level)
+                                val lat = SphereMercator.mercateY(centerTileY, level)
+                                append("%.6f\n%.6f".format(lon, lat))
+                                if (viewModel.debug) {
+                                    append("\n%.0f\n%.0f".format(offsetX, offsetY))
+                                }
+                            }
+                        }
+                    },
+                    size = latLonSize,
+                    topLeft = latLonOffset
+                )
             }
         }
     }

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

@@ -48,5 +48,9 @@ class SphereMercator {
         fun lat2sy(latitude: Double, level: Int): Double {
             return lat2y(latitude) / scaledMetersPerPixel(level)
         }
+
+        fun mercateX(x: Double, level: Int): Double = sx2lon((x * TILE_SIZE), level) - 180.0
+
+        fun mercateY(y: Double, level: Int): Double = -sy2lat((y - ((1 shl (level - 1)).toDouble() / 2.0)) * TILE_SIZE, level - 1)
     }
 }

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

@@ -47,7 +47,7 @@ class Tile {
         return bitmap
     }
 
-    fun mercateX(): Double = SphereMercator.sx2lon((x * TILE_SIZE).toDouble(), level) - 180.0
+    fun mercateX(): Double = SphereMercator.mercateX(x.toDouble(), level)
 
-    fun mercateY(): Double = -SphereMercator.sy2lat((y.toDouble() - ((1 shl (level - 1)).toDouble() / 2.0)) * TILE_SIZE, level - 1)
+    fun mercateY(): Double = SphereMercator.mercateY(y.toDouble(), level)
 }

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

@@ -12,14 +12,12 @@ class TileRepository(private val tileDao: TileDao) {
     fun pushTile(tile: Tile) {
         coroutineScope.launch(Dispatchers.IO) { tileDao.pushTile(tile) }
     }
-
     fun getTile(x: Int, y: Int, level: Int): Tile? {
         val tileFuture = coroutineScope.future(Dispatchers.IO) {
             tileDao.getTile(x, y, level)
         }
         return tileFuture.join()
     }
-
     fun clearTiles() {
         coroutineScope.launch(Dispatchers.IO) { tileDao.clearTiles() }
     }

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

@@ -6,6 +6,8 @@ import androidx.lifecycle.ViewModel
 
 class TileViewModel(application: Application): ViewModel() {
     val repository: TileRepository
+    var debug = false
+    var logRequested = false
 
     init {
         val tileDb = TileDB.getInstance(application)