add working speed-o-meter

.gitignore

@@ -13,3 +13,4 @@
 .externalNativeBuild
 .cxx
 local.properties
+test-data

.idea/deploymentTargetSelector.xml

@@ -4,7 +4,7 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
-        <DropdownSelection timestamp="2026-01-19T17:27:16.298528612Z">
+        <DropdownSelection timestamp="2026-02-13T13:44:07.200825088Z">
           <Target type="DEFAULT_BOOT">
             <handle>
               <DeviceId pluginId="LocalEmulator" identifier="path=/home/lukas/.config/.android/avd/Medium_Phone_OSS.avd" />

app/src/main/java/org/pupes/mhdrunpathfinder/GTFSUtils.kt

@@ -14,33 +14,36 @@ import kotlinx.serialization.Serializable
 import okhttp3.OkHttpClient
 import okhttp3.Request
 import ovh.plrapps.mapcompose.api.addMarker
+import ovh.plrapps.mapcompose.api.removeMarker
+import ovh.plrapps.mapcompose.ui.state.markers.model.RenderingStrategy
 import java.net.URL
 
 @Serializable
 data class GTFSRoute(
-    val agency_id: String,
+    val agency_id: String?,
     val is_night: Boolean,
-    val route_color: String,
+    val route_color: String?,
     val route_desc: String? = null,
-    val route_id: String,
-    val route_long_name: String,
-    val route_short_name: String,
-    val route_text_color: String,
+    val route_id: String?,
+    val route_long_name: String?,
+    val route_short_name: String?,
+    val route_text_color: String?,
     val route_type: Int,
-    val route_url: String,
+    val route_url: String?,
     val is_regional: Boolean,
     val is_substitute_transport: Boolean
 )
 
 // Type alias for array of GTFS routes
-typealias GTFSRoutes = List<GTFSRoute>
+typealias GTFSRoutes = MutableList<GTFSRoute>
+
+var gtfsRoutes: GTFSRoutes = mutableListOf()
 
-var gtfsRoutes: GTFSRoutes? = null
 
 @Serializable
 data class GTFSStopGeometry(
     val coordinates: List<Double>,
-    val type: String
+    val type: String?
 )
 
 @Serializable
@@ -49,7 +52,7 @@ data class GTFSStopProperties(
     val parent_station: String? = null,
     val platform_code: String? = null,
     val stop_id: String,
-    val stop_name: String,
+    val stop_name: String?,
     val wheelchair_boarding: Int,
     val zone_id: String? = null,
     val level_id: String? = null
@@ -59,16 +62,16 @@ data class GTFSStopProperties(
 data class GTFSStop(
     val geometry: GTFSStopGeometry,
     val properties: GTFSStopProperties,
-    val type: String
+    val type: String?
 )
 
 @Serializable
 data class GTFSStops(
-    val features: List<GTFSStop>,
-    val type: String
+    val features: MutableList<GTFSStop>,
+    val type: String?
 )
 
-var gtfsStops: GTFSStops? = null
+var gtfsStops: GTFSStops = GTFSStops(mutableListOf<GTFSStop>(), "FeatureCollection")
 
 
 // OkHttpClient for making HTTP requests
@@ -104,34 +107,24 @@ private fun fetchGTFSPosition(gtfsUrl: URL,api_key: String, callee: Activity) {
     }
 }
 
+
 // Start the timer with a URL:
 fun startGTFSTracking(url: String, api_key: String, callee: Activity) {
     if (GTFSIsTracking) return
 
     GTFSIsTracking = true
     GTFSTrackingThread = Thread {
-        var gtfsUrl = URL(url);
+        val gtfsUrl = URL(url);
         try {
-                if(gtfsRoutes == null) {
-                val request = Request.Builder()
-                    .url("${gtfsUrl.protocol}://${gtfsUrl.host}${callee.getString(R.string.routes_path)}")
-                    .header(
-                        "User-Agent",
-                        "${BuildConfig.APPLICATION_ID}/${BuildConfig.VERSION_NAME} (Android)"
-                    )
-                    .header("X-Access-Token", api_key).build();
+            if(gtfsRoutes.isEmpty()) {
+                GTFSMainHandler.post {
+                    Toast.makeText(callee, "Fetching routes...", Toast.LENGTH_SHORT).show()}
 
-                gtfshttpClient.newCall(request).execute().use { response ->
-                    var message = if (response.isSuccessful) {
-                        response.body?.string() ?: "Empty response"
-                    } else {
-                        "Error: ${response.code} ${response.message}"
-                    }
-                    gtfsRoutes = json.decodeFromString<GTFSRoutes>(message)
-                }}
-                if(gtfsStops == null) {
+                var messageParsed: GTFSRoutes;
+                var offset = 0;
+                do {
                     val request = Request.Builder()
-                        .url("${gtfsUrl.protocol}://${gtfsUrl.host}${callee.getString(R.string.stops_path)}")
+                        .url("${gtfsUrl.protocol}://${gtfsUrl.host}${callee.getString(R.string.routes_path)}?offset=${offset}")
                         .header(
                             "User-Agent",
                             "${BuildConfig.APPLICATION_ID}/${BuildConfig.VERSION_NAME} (Android)"
@@ -144,27 +137,63 @@ fun startGTFSTracking(url: String, api_key: String, callee: Activity) {
                         } else {
                             "Error: ${response.code} ${response.message}"
                         }
-                        gtfsStops = json.decodeFromString<GTFSStops>(message)
+                        messageParsed = json.decodeFromString<GTFSRoutes>(message)
+                        gtfsRoutes.addAll(messageParsed)
+                        offset += messageParsed.size
+                    }} while (messageParsed.isNotEmpty())
+            }
+            if(gtfsStops.features.isEmpty()) {
+                GTFSMainHandler.post {
+                    Toast.makeText(callee, "Fetching stops...", Toast.LENGTH_SHORT).show()}
 
-                        // put all stops on the map
-                        for (stop in gtfsStops!!.features) {
-                            GTFSMainHandler.post {
-                                mapState.addMarker(stop.properties.stop_id, x = longitudeToXNormalized(stop.geometry.coordinates[0]), y = latitudeToYNormalized(stop.geometry.coordinates[0])) {
-                                    Icon(
-                                        painter = painterResource(id = R.drawable.outline_directions_bus_24),
-                                        contentDescription = null,
-                                        modifier = Modifier.size(17.dp),
-                                        tint = Color(0xFF0000FF)
-                                    )
-                                }
+                var messageParsed: GTFSStops;
+                var offset = 0;
+                do {
+                    val request = Request.Builder()
+                        .url("${gtfsUrl.protocol}://${gtfsUrl.host}${callee.getString(R.string.stops_path)}?offset=${offset}")
+                        .header(
+                            "User-Agent",
+                            "${BuildConfig.APPLICATION_ID}/${BuildConfig.VERSION_NAME} (Android)"
+                        )
+                        .header("X-Access-Token", api_key).build();
 
-                            }
+                    gtfshttpClient.newCall(request).execute().use { response ->
+                        var message = if (response.isSuccessful) {
+                            response.body?.string() ?: "Empty response"
+                        } else {
+                            "Error: ${response.code} ${response.message}"
                         }
+                        messageParsed = json.decodeFromString<GTFSStops>(message)
+                        gtfsStops.features.addAll(messageParsed.features)
+                    }
+
+                    offset += messageParsed.features.size;
+                }while(messageParsed.features.isNotEmpty())
+            }
+            // put all stops on the map
+            GTFSMainHandler.post {
+                Toast.makeText(callee, "Drawing stops...", Toast.LENGTH_SHORT).show()}
+            for (stop in gtfsStops!!.features) {
+
+                if (stop.properties.parent_station == null) {
+                    mapState.addMarker(stop.properties.stop_id, x = longitudeToXNormalized(stop.geometry.coordinates[0]), y = latitudeToYNormalized(stop.geometry.coordinates[1]), renderingStrategy = RenderingStrategy.LazyLoading("default")) {
+                        Icon(
+                            painter = painterResource(id = R.drawable.outline_directions_bus_24),
+                            contentDescription = null,
+                            modifier = Modifier.size(12.dp),
+                            tint = Color(0xFF0000FF)
+                        )
                     }}
-            } catch(e: Exception) {
+            }
+            GTFSMainHandler.post {
+                Toast.makeText(callee, "Done drawing ${gtfsStops.features.size} stops", Toast.LENGTH_SHORT).show()}
+
+        } catch(e: Exception) {
+            GTFSMainHandler.post {
                 Toast.makeText(callee, e.message ?: "Unknown error", Toast.LENGTH_SHORT).show()
-                GTFSMainHandler.post { stopGTFSTracking() }
-                return@Thread
+            }
+            GTFSMainHandler.post { stopGTFSTracking() }
+            return@Thread
         }
         while (GTFSIsTracking) {
             fetchGTFSPosition(gtfsUrl,api_key, callee)
@@ -179,6 +208,11 @@ fun startGTFSTracking(url: String, api_key: String, callee: Activity) {
 
 fun stopGTFSTracking() {
     GTFSIsTracking = false
+    for (stop in gtfsStops!!.features) {
+        if (stop.properties.parent_station == null) {
+            mapState.removeMarker(stop.properties.stop_id);
+        }
+    }
     GTFSTrackingThread?.interrupt()
     GTFSTrackingThread = null
 }

app/src/main/java/org/pupes/mhdrunpathfinder/HaukUtils.kt

@@ -49,15 +49,38 @@ private fun fetchHaukPosition(haukUrl: String, callee: Activity) {
 
             message = "{" + message.substringAfter("{");
             val hauk_response = json.decodeFromString<HaukResponse>(message)
-
-            val lat = hauk_response.points.last()?.getOrNull(0)
-            val lon = hauk_response.points.last()?.getOrNull(1)
+            val lat = hauk_response.points.last().getOrNull(0)
+            val lon = hauk_response.points.last().getOrNull(1)
             if (lat != null && lon != null) {
-            HaukMainHandler.post {
-                mapState.moveMarker("target_position", x = longitudeToXNormalized(lon), y = latitudeToYNormalized(lat))
-            }
+
+                val lastlat = hauk_response.points.getOrNull(hauk_response.points.size - 2)?.getOrNull(0)
+                val lastlon = hauk_response.points.getOrNull(hauk_response.points.size - 2)?.getOrNull(1)
+                val newspeed =
+                    if (lastlat != null && lastlon != null) {
+                        var fulldistance: Double = 0.0
+                        for (i in 1 until hauk_response.points.size -1) {
+                            try{
+                                fulldistance += haversineDistance(hauk_response.points[i-1][0]!!, hauk_response.points[i-1][1]!!, hauk_response.points[i][0]!!, hauk_response.points[i][1]!!)
+                            } catch (e: Exception) {
+                            // Ignore
+                            }
+                        }
+                        (fulldistance / (hauk_response.interval * hauk_response.points.size)*3600)
+                    } else {
+                        0.0
+                    }
+                HaukMainHandler.post {
+                    try {
+                        mapState.moveMarker("target_position", x = longitudeToXNormalized(lon), y = latitudeToYNormalized(lat))
+                        target_speed = "${"%.1f".format(newspeed)}km/h"
+                    } catch (e: Exception) {
+                        // Marker might not exist yet, ignore
+                    }
+                }
             } else {
-                Toast.makeText(callee, "TARGET LOCATION NOT AVAILABLE", Toast.LENGTH_SHORT).show()
+                HaukMainHandler.post {
+                    Toast.makeText(callee, "TARGET LOCATION NOT AVAILABLE", Toast.LENGTH_SHORT).show()
+                }
             }}
     } catch (e: Exception) {
         // Post UI update to main thread

app/src/main/java/org/pupes/mhdrunpathfinder/Helpers.kt

@@ -4,6 +4,27 @@ import kotlinx.serialization.json.Json
 import kotlin.math.PI
 import kotlin.math.ln
 import kotlin.math.tan
+import kotlin.math.*
+
+fun haversineDistance(
+    lat1: Double,
+    lon1: Double,
+    lat2: Double,
+    lon2: Double
+): Double {
+    val R = 6371.0 // Earth radius in kilometers
+
+    val phi1 = lat1 * PI / 180
+    val phi2 = lat2 * PI / 180
+    val deltaPhi = (lat2 - lat1) * PI / 180
+    val deltaLambda = (lon2 - lon1) * PI / 180
+
+    val a = sin(deltaPhi / 2).pow(2) +
+            cos(phi1) * cos(phi2) * sin(deltaLambda / 2).pow(2)
+    val c = 2 * atan2(sqrt(a), sqrt(1 - a))
+
+    return R * c
+}
 
 val json = Json {
     coerceInputValues = true // Coerce nulls to default values if applicable

app/src/main/java/org/pupes/mhdrunpathfinder/MainActivity.kt

@@ -2,7 +2,6 @@ package org.pupes.mhdrunpathfinder
 
 import android.app.Activity
 import android.content.Context
-import android.content.SharedPreferences
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
@@ -30,8 +29,10 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
+import kotlinx.coroutines.launch
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.RectangleShape
@@ -40,12 +41,20 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.core.content.edit
 import ovh.plrapps.mapcompose.api.addLayer
+import ovh.plrapps.mapcompose.api.addLazyLoader
 import ovh.plrapps.mapcompose.api.addMarker
 import ovh.plrapps.mapcompose.api.scrollTo
 import ovh.plrapps.mapcompose.core.TileStreamProvider
 import ovh.plrapps.mapcompose.ui.MapUI
 import ovh.plrapps.mapcompose.ui.state.MapState
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileOutputStream
 import java.net.URL
+import android.os.StrictMode
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.unit.sp
+import ovh.plrapps.mapcompose.api.getMarkerInfo
 
 
 // MapState configuration for OpenStreetMap
@@ -58,14 +67,84 @@ val mapState = MapState(
     fullHeight = 67108864,
     tileSize = 256
 )
+var target_speed by mutableStateOf("0.0km/h");
 
+/**
+ * Creates a cached tile stream provider for OpenStreetMap tiles
+ * Tiles are cached in the app's cache directory for offline access and faster loading
+ * Cache expires after 30 days to ensure map updates are fetched
+ */
+fun createCachedTileStreamProvider(context: Context, cacheExpiryDays: Int = 30): TileStreamProvider {
+    val cacheDir = File(context.cacheDir, "map_tiles")
+    if (!cacheDir.exists()) {
+        cacheDir.mkdirs()
+    }
 
+    val cacheExpiryMillis = cacheExpiryDays * 24 * 60 * 60 * 1000L
+
+    return TileStreamProvider { row, col, zoomLvl ->
+        try {
+            val tileFile = File(cacheDir, "tile_${zoomLvl}_${col}_${row}.png")
+
+            val shouldUseCache = tileFile.exists() &&
+                    (System.currentTimeMillis() - tileFile.lastModified()) < cacheExpiryMillis
+
+            if (shouldUseCache) {
+                return@TileStreamProvider FileInputStream(tileFile)
+            }
+
+            // Since mapcompose runs this on a background thread, we can do networking here.
+            try {
+                val url = URL("https://tile.openstreetmap.org/$zoomLvl/$col/$row.png")
+                val connection = url.openConnection()
+                // Set User-Agent header as required by OSM tile usage policy
+                val userAgent = "${BuildConfig.APPLICATION_ID}/${BuildConfig.VERSION_NAME} (Android) (Contact: poliecho@pupes.org)"
+                connection.setRequestProperty("User-Agent", userAgent)
+                connection.connectTimeout = 5000
+                connection.readTimeout = 10000
+
+                connection.getInputStream().use { inputStream ->
+                    FileOutputStream(tileFile).use { outputStream ->
+                        inputStream.copyTo(outputStream)
+                    }
+                }
+                FileInputStream(tileFile)
+            } catch (e: Exception) {
+                e.printStackTrace()
+                // If download fails, try to use an expired cached tile if it exists
+                if (tileFile.exists()) {
+                    FileInputStream(tileFile)
+                } else {
+                    null
+                }
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+            null
+        }
+    }
+}
 
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
+        // Configure StrictMode to detect threading violations (debug mode only)
+        if (BuildConfig.DEBUG) {
+            StrictMode.setThreadPolicy(
+                StrictMode.ThreadPolicy.Builder()
+                    .detectAll()
+                    .penaltyLog()  // Log violations instead of crashing
+                    .build()
+            )
+            StrictMode.setVmPolicy(
+                StrictMode.VmPolicy.Builder()
+                    .detectAll()
+                    .penaltyLog()
+                    .build()
+            )
+        }
 
         setContent {
             MaterialTheme {
@@ -91,25 +170,55 @@ class MainActivity : ComponentActivity() {
 @Composable
 fun MainScreen(callee: Activity) {
     val sharedPreferences = remember { callee.getSharedPreferences("PREFERENCES", Context.MODE_PRIVATE) }
+    val coroutineScope = rememberCoroutineScope()
     var showSettings by remember { mutableStateOf(false) }
     var haukUrl by remember { mutableStateOf("") }
     var golemioAPIkey by remember { mutableStateOf(sharedPreferences.getString("golemioAPIkey", "")?: "" ) }
     var haukState by remember { mutableStateOf(false) }
-    var golemioState by remember { mutableStateOf(false)}
+    var golemioState by remember { mutableStateOf(golemioAPIkey.isNotEmpty())}
 
-    if (golemioAPIkey.isNotEmpty()) {
-        golemioState = true
-        startGTFSTracking(callee.getString(R.string.golemio_base_url), golemioAPIkey, callee);
+    LaunchedEffect(Unit) {
+        if (golemioState) {
+            startGTFSTracking(callee.getString(R.string.golemio_base_url), golemioAPIkey, callee)
+        }
     }
 
     Box(modifier = Modifier.fillMaxSize()) {
-        OpenStreetMapScreen()
-        SettingsButton(
+        OpenStreetMapScreen(callee)
+        IconButton( // settings button
             onClick = { showSettings = true },
             modifier = Modifier
                 .align(Alignment.TopEnd)
-                .padding(end = 5.dp, bottom = 5.dp)
+                .padding(end = 5.dp, bottom = 5.dp),
+            IconID = R.drawable.baseline_settings_24
         )
+        Column(modifier = Modifier.align(Alignment.TopStart)) {
+        IconButton( // look at target button
+            onClick = {
+                coroutineScope.launch {
+                    mapState.getMarkerInfo("target_position")?.let { marker ->
+                        mapState.scrollTo(marker.x, marker.y, destScale = 0.1)
+                    }
+                }
+            },
+            modifier = Modifier
+                .padding(start = 5.dp, bottom = 5.dp),
+            IconID = R.drawable.target
+        )
+        IconButton( // look at my location button
+                onClick = {
+                    coroutineScope.launch {
+                        mapState.getMarkerInfo("current_position")?.let { marker ->
+                            mapState.scrollTo(marker.x, marker.y, destScale = 0.1)
+                        }
+                    }
+                },
+                modifier = Modifier
+                    .padding(start = 5.dp, bottom = 5.dp),
+                IconID = R.drawable.user_location
+            )
+        }
+
         if (showSettings) {
             ShowSettingsMenu(
                 onDismiss = { showSettings = false },
@@ -168,7 +277,7 @@ fun MainScreen(callee: Activity) {
 @Composable
 // When a composable with parameters is used with @Preview,
 // a default value must be provided for the preview to render.
-fun SettingsButton(modifier: Modifier = Modifier, onClick: () -> Unit = {}) {
+fun IconButton(modifier: Modifier = Modifier, onClick: () -> Unit = {}, IconID: Int = R.drawable.baseline_settings_24) {
     Button(
         onClick = { onClick() },
         colors = ButtonDefaults.buttonColors(containerColor = Color(0xCFFFFFFF)),
@@ -176,7 +285,7 @@ fun SettingsButton(modifier: Modifier = Modifier, onClick: () -> Unit = {}) {
 
     ) {
         Icon(
-            painter = painterResource(id = R.drawable.baseline_settings_24),
+            painter = painterResource(id = IconID),
             contentDescription = null,
             modifier = Modifier.size(24.dp),
             tint = Color(0xFF000000)
@@ -211,6 +320,7 @@ fun ShowSettingsMenu(
                     value = haukUrl,
                     onValueChange = onHaukUrlChange,
                     label = { Text("Target Hauk URL") },
+                    singleLine = true,
                     modifier = Modifier
                         .width(250.dp)
                 )
@@ -224,6 +334,7 @@ fun ShowSettingsMenu(
                     onCheckedChange = { onGolemioStateChange(it) }
                 )
                 TextField(value = golemioAPIkey, onValueChange = onGolemioAPIChange, label = { Text("Golemio API Key") },
+                    singleLine = true,
                     modifier = Modifier
                         .width(250.dp));
                 ElevatedButton(onClick = onGolemioApply, modifier = Modifier.padding(start = 5.dp), shape = RectangleShape) {
@@ -235,56 +346,86 @@ fun ShowSettingsMenu(
 
 @Preview
 @Composable
-fun OpenStreetMapScreen() {
-    // Create tile stream provider for OpenStreetMap with User-Agent
-    val tileStreamProvider = TileStreamProvider { row, col, zoomLvl ->
-        try {
-            val url = URL("https://tile.openstreetmap.org/$zoomLvl/$col/$row.png")
-            val connection = url.openConnection()
-            // Set User-Agent header as required by OSM tile usage policy
-            // Format: AppId/Version (Platform) (Contact: email)
-            val userAgent = "${BuildConfig.APPLICATION_ID}/${BuildConfig.VERSION_NAME} (Android) (Contact: poliecho@pupes.org)"
-            connection.setRequestProperty("User-Agent", userAgent)
-            connection.getInputStream()
-        } catch (e: Exception) {
-            e.printStackTrace()
-            null
+fun OpenStreetMapScreen(context: Context? = null) {
+    // Create tile stream provider for OpenStreetMap with caching
+    val tileStreamProvider = remember(context) {
+        context?.let {
+            createCachedTileStreamProvider(it)
+        } ?: TileStreamProvider { row, col, zoomLvl ->
+            // Fallback for preview mode without context
+            try {
+                val url = URL("https://tile.openstreetmap.org/$zoomLvl/$col/$row.png")
+                val connection = url.openConnection()
+                val userAgent = "MHDrunPathfinder/Preview (Android)"
+                connection.setRequestProperty("User-Agent", userAgent)
+                connection.getInputStream()
+            } catch (e: Exception) {
+                e.printStackTrace()
+                null
+            }
         }
     }
 
+    // Track if map has been initialized to prevent duplicate operations
+    var mapInitialized by remember { mutableStateOf(false) }
 
-
-    /* Add a marker at the center of the map */
-    mapState.addMarker("target_position", x = longitudeToXNormalized(14.4058031), y = latitudeToYNormalized(50.0756083)) {
-        Icon(
-            painter = painterResource(id = R.drawable.target),
-            contentDescription = null,
-            modifier = Modifier.size(20.dp),
-            tint = Color(0xFFFF0000)
-        )
-    }
-
-    /* Add a marker for current position */
-    mapState.addMarker("current_position", x = longitudeToXNormalized(14.4378), y = latitudeToYNormalized(50.0755)) {
-        Icon(
-            painter = painterResource(id = R.drawable.user_location),
-            contentDescription = null,
-            modifier = Modifier.size(20.dp),
-            tint = Color(0xFF0000FF) // Blue color for current position
-        )
-    }
-
-    // Add the tile layer and set initial position
+    // Add the tile layer, markers, and set initial position - all in LaunchedEffect to avoid blocking main thread
     LaunchedEffect(Unit) {
-        mapState.addLayer(tileStreamProvider)
+        if (!mapInitialized) {
+            // Add lazy loader first
+            mapState.addLazyLoader("default")
 
-        // Scroll to Prague, Czech Republic
-        // Prague coordinates: latitude 50.0755, longitude 14.4378
-        val normalizedX = longitudeToXNormalized(14.4378)
-        val normalizedY = latitudeToYNormalized(50.0755)
+            // Add tile layer
+            mapState.addLayer(tileStreamProvider)
 
-        // Use a higher scale to zoom in more (closer to 1.0 = more zoomed in)
-        mapState.scrollTo(normalizedX, normalizedY, destScale = 0.8)
+            // Add a marker for target position
+            mapState.addMarker("target_position", x = longitudeToXNormalized(14.0), y = latitudeToYNormalized(50.0), Offset(-0.5f,-0.25f)) {
+                Column(horizontalAlignment = Alignment.CenterHorizontally) {
+                    Icon(
+                        painter = painterResource(id = R.drawable.target),
+                        contentDescription = null,
+                        modifier = Modifier.size(24.dp),
+                        tint = Color(0xFFFF0000)
+                    )
+                    Surface(
+                        color = Color.Red,
+                        shadowElevation = 4.dp,
+                        shape = MaterialTheme.shapes.small,
+                        modifier = Modifier.padding(1.dp)
+                    ) {
+                        Text(
+                            text = target_speed,
+                            modifier = Modifier.padding(1.dp),
+                            style = MaterialTheme.typography.bodyMedium,
+                            fontSize = 8.sp,
+                            color = Color.Blue
+                        )
+                    }
+                }
+            }
+
+            /* Add a marker for current position */
+            mapState.addMarker("current_position", x = longitudeToXNormalized(14.0), y = latitudeToYNormalized(50.0),
+                Offset(-0.5f,-0.5f)
+            ) {
+                Icon(
+                    painter = painterResource(id = R.drawable.user_location),
+                    contentDescription = null,
+                    modifier = Modifier.size(24.dp),
+                    tint = Color(0xFF004802)
+                )
+            }
+
+            // Scroll to Prague, Czech Republic
+            // Prague coordinates: latitude 50.0755, longitude 14.4378
+            val normalizedX = longitudeToXNormalized(14.4378)
+            val normalizedY = latitudeToYNormalized(50.0755)
+
+            // Use a higher scale to zoom in more (closer to 1.0 = more zoomed in)
+            mapState.scrollTo(normalizedX, normalizedY, destScale = 0.1)
+
+            mapInitialized = true
+        }
     }
 
     // Display the map

app/src/main/res/values/strings.xml

@@ -3,4 +3,5 @@
     <string name="routes_path">/v2/gtfs/routes</string>
     <string name="stops_path">/v2/gtfs/stops</string>
     <string name="golemio_base_url">https://api.golemio.cz</string>
+    <string name="golemio_realtime_path"></string>
 </resources>