fix(example): updated marker stress test to use more stressful markers

example/lib/pages/many_circles.dart

@@ -6,7 +6,7 @@ import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_map_example/misc/tile_providers.dart';
 import 'package:flutter_map_example/widgets/drawer/menu_drawer.dart';
 import 'package:flutter_map_example/widgets/number_of_items_slider.dart';
-import 'package:flutter_map_example/widgets/show_no_web_perf_overlay_snackbar.dart';
+import 'package:flutter_map_example/widgets/perf_overlay.dart';
 import 'package:latlong2/latlong.dart';
 
 const _maxCirclesCount = 30000;
@@ -28,8 +28,28 @@ class _ManyCirclesPageState extends State<ManyCirclesPage> {
   static double doubleInRange(Random source, num start, num end) =>
       source.nextDouble() * (end - start) + start;
 
-  int numOfCircles = _maxCirclesCount ~/ 10;
-  List<CircleMarker> allCircles = [];
+  final randomGenerator = Random();
+  late List<CircleMarker> allCircles = List.generate(
+    _maxCirclesCount,
+    (i) => CircleMarker(
+      point: LatLng(
+        doubleInRange(randomGenerator, 37, 55),
+        doubleInRange(randomGenerator, -9, 30),
+      ),
+      color: HSLColor.fromAHSL(
+        1,
+        i % 360,
+        1,
+        doubleInRange(randomGenerator, 0.3, 0.7),
+      ).toColor(),
+      radius: 5,
+      useRadiusInMeter: false,
+      borderStrokeWidth: 0,
+      borderColor: Colors.black,
+    ),
+    growable: false,
+  );
+  int displayedCirclesCount = _maxCirclesCount ~/ 10;
 
   bool useBorders = false;
   bool useRadiusInMeters = false;
@@ -38,26 +58,7 @@ class _ManyCirclesPageState extends State<ManyCirclesPage> {
   @override
   void initState() {
     super.initState();
-
-    showNoWebPerfOverlaySnackbar(context);
-
-    Future.microtask(() {
-      final r = Random();
-      for (double x = 0; x < _maxCirclesCount; x++) {
-        allCircles.add(
-          CircleMarker(
-            point: LatLng(doubleInRange(r, 37, 55), doubleInRange(r, -9, 30)),
-            color: HSLColor.fromAHSL(1, x % 360, 1, doubleInRange(r, 0.3, 0.7))
-                .toColor(),
-            radius: 5,
-            useRadiusInMeter: false,
-            borderStrokeWidth: 0,
-            borderColor: Colors.black,
-          ),
-        );
-      }
-      setState(() {});
-    });
+    PerfOverlay.showWebUnavailable(context);
   }
 
   @override
@@ -85,7 +86,9 @@ class _ManyCirclesPageState extends State<ManyCirclesPage> {
             children: [
               openStreetMapTileLayer,
               CircleLayer(
-                circles: allCircles.take(numOfCircles).toList(growable: false),
+                circles: allCircles
+                    .take(displayedCirclesCount)
+                    .toList(growable: false),
                 optimizeRadiusInMeters: optimizeRadiusInMeters,
               ),
             ],
@@ -98,8 +101,8 @@ class _ManyCirclesPageState extends State<ManyCirclesPage> {
               child: Column(
                 children: [
                   NumberOfItemsSlider(
-                    number: numOfCircles,
-                    onChanged: (v) => setState(() => numOfCircles = v),
+                    number: displayedCirclesCount,
+                    onChanged: (v) => setState(() => displayedCirclesCount = v),
                     maxNumber: _maxCirclesCount,
                     itemDescription: 'Circle',
                   ),
@@ -187,11 +190,11 @@ class _ManyCirclesPageState extends State<ManyCirclesPage> {
             ),
           ),
           if (!kIsWeb)
-            Positioned(
-              bottom: 16,
+            const Positioned(
+              bottom: 8,
               left: 0,
               right: 0,
-              child: PerformanceOverlay.allEnabled(),
+              child: PerfOverlay(),
             ),
         ],
       ),

example/lib/pages/many_markers.dart

@@ -6,15 +6,19 @@ import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_map_example/misc/tile_providers.dart';
 import 'package:flutter_map_example/widgets/drawer/menu_drawer.dart';
 import 'package:flutter_map_example/widgets/number_of_items_slider.dart';
-import 'package:flutter_map_example/widgets/show_no_web_perf_overlay_snackbar.dart';
+import 'package:flutter_map_example/widgets/perf_overlay.dart';
 import 'package:latlong2/latlong.dart';
 
 const _maxMarkersCount = 20000;
+const _londonOrigin = LatLng(51.5074, -0.1278);
 
 /// On this page, [_maxMarkersCount] markers are randomly generated
-/// across europe, and then you can limit them with a slider
+/// across London, and then you can limit them with a slider
 ///
 /// This way, you can test how map performs under a lot of markers
+///
+/// The markers are quite expensive - an `Icon` is expensive itself, and adding
+/// a `GestureDetector` makes things much slower.
 class ManyMarkersPage extends StatefulWidget {
   static const String route = '/many_markers';
 
@@ -25,32 +29,56 @@ class ManyMarkersPage extends StatefulWidget {
 }
 
 class ManyMarkersPageState extends State<ManyMarkersPage> {
-  double doubleInRange(Random source, num start, num end) =>
-      source.nextDouble() * (end - start) + start;
-  List<Marker> allMarkers = [];
+  final randomGenerator = Random(10);
+  late final allMarkers = List.generate(
+    _maxMarkersCount,
+    (_) {
+      final angle = randomGenerator.nextDouble() * 2 * pi;
+      final distance = randomGenerator.nextDouble() * 0.5;
+      final latOffset =
+          distance * sin(angle) * (0.7 + randomGenerator.nextDouble() * 0.6);
+      final lngOffset =
+          distance * cos(angle) * (0.7 + randomGenerator.nextDouble() * 0.6);
+      final position = LatLng(
+        _londonOrigin.latitude + latOffset,
+        _londonOrigin.longitude + lngOffset,
+      );
 
-  int numOfMarkers = _maxMarkersCount ~/ 10;
+      return Marker(
+        point: position,
+        width: 30,
+        height: 30,
+        child: GestureDetector(
+          onTap: () => ScaffoldMessenger.of(context).showSnackBar(
+            SnackBar(
+              content: Text(
+                'Tapped existing marker (${position.latitude}, '
+                '${position.longitude})',
+              ),
+              duration: const Duration(seconds: 1),
+              showCloseIcon: true,
+            ),
+          ),
+          child: Icon(
+            Icons.location_pin,
+            size: 30,
+            color: Color.fromARGB(
+              255,
+              randomGenerator.nextInt(256),
+              randomGenerator.nextInt(256),
+              randomGenerator.nextInt(256),
+            ),
+          ),
+        ),
+      );
+    },
+  );
+  int displayedMarkersCount = _maxMarkersCount ~/ 10;
 
   @override
   void initState() {
     super.initState();
-
-    showNoWebPerfOverlaySnackbar(context);
-
-    Future.microtask(() {
-      final r = Random();
-      for (var x = 0; x < _maxMarkersCount; x++) {
-        allMarkers.add(
-          Marker(
-            point: LatLng(doubleInRange(r, 37, 55), doubleInRange(r, -9, 30)),
-            height: 12,
-            width: 12,
-            child: ColoredBox(color: Colors.blue[900]!),
-          ),
-        );
-      }
-      setState(() {});
-    });
+    PerfOverlay.showWebUnavailable(context);
   }
 
   @override
@@ -64,39 +92,37 @@ class ManyMarkersPageState extends State<ManyMarkersPage> {
             options: MapOptions(
               initialCameraFit: CameraFit.bounds(
                 bounds: LatLngBounds(
-                  const LatLng(55, -9),
-                  const LatLng(37, 30),
-                ),
-                padding: const EdgeInsets.only(
-                  left: 16,
-                  right: 16,
-                  top: 88,
-                  bottom: 192,
+                  const LatLng(50, -0.5),
+                  const LatLng(53, 0.3),
                 ),
               ),
             ),
             children: [
               openStreetMapTileLayer,
-              MarkerLayer(markers: allMarkers.take(numOfMarkers).toList()),
+              MarkerLayer(
+                markers: allMarkers
+                    .take(displayedMarkersCount)
+                    .toList(growable: false),
+              ),
             ],
           ),
           Positioned(
             left: 16,
             top: 16,
             right: 16,
             child: NumberOfItemsSlider(
-              number: numOfMarkers,
-              onChanged: (v) => setState(() => numOfMarkers = v),
+              number: displayedMarkersCount,
+              onChanged: (v) => setState(() => displayedMarkersCount = v),
               maxNumber: _maxMarkersCount,
               itemDescription: 'Marker',
             ),
           ),
           if (!kIsWeb)
-            Positioned(
-              bottom: 16,
+            const Positioned(
+              bottom: 8,
               left: 0,
               right: 0,
-              child: PerformanceOverlay.allEnabled(),
+              child: PerfOverlay(),
             ),
         ],
       ),

example/lib/pages/polygon_perf_stress.dart

@@ -4,7 +4,7 @@ import 'package:flutter/services.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_map_example/misc/tile_providers.dart';
 import 'package:flutter_map_example/widgets/drawer/menu_drawer.dart';
-import 'package:flutter_map_example/widgets/show_no_web_perf_overlay_snackbar.dart';
+import 'package:flutter_map_example/widgets/perf_overlay.dart';
 import 'package:flutter_map_example/widgets/simplification_tolerance_slider.dart';
 import 'package:latlong2/latlong.dart';
 
@@ -40,7 +40,7 @@ class _PolygonPerfStressPageState extends State<PolygonPerfStressPage> {
   @override
   void initState() {
     super.initState();
-    showNoWebPerfOverlaySnackbar(context);
+    PerfOverlay.showWebUnavailable(context);
   }
 
   @override
@@ -193,11 +193,11 @@ class _PolygonPerfStressPageState extends State<PolygonPerfStressPage> {
             ),
           ),
           if (!kIsWeb)
-            Positioned(
-              bottom: 16,
+            const Positioned(
+              bottom: 8,
               left: 0,
               right: 0,
-              child: PerformanceOverlay.allEnabled(),
+              child: PerfOverlay(),
             ),
         ],
       ),

example/lib/pages/polyline_perf_stress.dart

@@ -5,7 +5,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_map_example/misc/tile_providers.dart';
 import 'package:flutter_map_example/widgets/drawer/menu_drawer.dart';
-import 'package:flutter_map_example/widgets/show_no_web_perf_overlay_snackbar.dart';
+import 'package:flutter_map_example/widgets/perf_overlay.dart';
 import 'package:flutter_map_example/widgets/simplification_tolerance_slider.dart';
 import 'package:latlong2/latlong.dart';
 
@@ -27,7 +27,7 @@ class _PolylinePerfStressPageState extends State<PolylinePerfStressPage> {
   void initState() {
     super.initState();
 
-    showNoWebPerfOverlaySnackbar(context);
+    PerfOverlay.showWebUnavailable(context);
 
     final random = Random(1234);
     for (int i = 1; i < 300000; i++) {
@@ -85,11 +85,11 @@ class _PolylinePerfStressPageState extends State<PolylinePerfStressPage> {
             ),
           ),
           if (!kIsWeb)
-            Positioned(
-              bottom: 16,
+            const Positioned(
+              bottom: 8,
               left: 0,
               right: 0,
-              child: PerformanceOverlay.allEnabled(),
+              child: PerfOverlay(),
             ),
         ],
       ),

example/lib/widgets/perf_overlay.dart

@@ -0,0 +1,50 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+class PerfOverlay extends StatefulWidget {
+  const PerfOverlay({super.key});
+
+  static void showWebUnavailable(BuildContext context) {
+    if (kIsWeb) {
+      WidgetsBinding.instance.addPostFrameCallback(
+        (_) => ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(
+            content: Text('Cannot show performance graph overlay on web'),
+          ),
+        ),
+      );
+    }
+  }
+
+  @override
+  State<PerfOverlay> createState() => _PerfOverlayState();
+}
+
+class _PerfOverlayState extends State<PerfOverlay> {
+  bool showPerformanceChart = false;
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.end,
+      children: [
+        Padding(
+          padding: const EdgeInsets.only(right: 8),
+          child: IconButton.outlined(
+            onPressed: () => setState(
+              () => showPerformanceChart = !showPerformanceChart,
+            ),
+            icon: const Icon(Icons.troubleshoot),
+            isSelected: showPerformanceChart,
+            tooltip: 'Show Performance Overlay',
+          ),
+        ),
+        if (showPerformanceChart)
+          Padding(
+            padding: const EdgeInsets.symmetric(vertical: 8),
+            child: PerformanceOverlay.allEnabled(),
+          ),
+      ],
+    );
+  }
+}