Polish earth login animation

lib/features/mapflow/presentation/mapflow_shell.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:convert';
 import 'dart:math' as math;
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_svg/flutter_svg.dart';
@@ -328,6 +329,8 @@ class _MapboxMapLayer extends StatefulWidget {
 }
 
 class _MapboxMapLayerState extends State<_MapboxMapLayer> {
+  static const _worldCenter = LatLng(8.0, 32.0);
+
   mbx.MapboxMap? _mapboxMap;
   var _mapLoaded = false;
   var _didInitialFlyIn = false;
@@ -351,12 +354,19 @@ class _MapboxMapLayerState extends State<_MapboxMapLayer> {
         mbx.MapWidget(
           styleUri: _mapboxStyleUri,
           viewport: mbx.CameraViewportState(
-            center: _mapboxPoint(widget.initialCenter),
-            zoom: _didInitialFlyIn ? 14.8 : 1.25,
-            bearing: _didInitialFlyIn ? -16 : 0,
+            center: _mapboxPoint(
+              _didInitialFlyIn ? widget.initialCenter : _worldCenter,
+            ),
+            zoom: _didInitialFlyIn ? 14.8 : 0.58,
+            bearing: _didInitialFlyIn ? -16 : -24,
             pitch: _didInitialFlyIn ? 62 : 0,
           ),
           onMapCreated: _onMapCreated,
+          onStyleLoadedListener: (_) {
+            if (!kIsWeb) {
+              unawaited(_enableGlobeProjection());
+            }
+          },
           onMapLoadedListener: (_) {
             _mapLoaded = true;
             _updateCameraForFocus();
@@ -392,6 +402,16 @@ class _MapboxMapLayerState extends State<_MapboxMapLayer> {
     _mapboxMap = mapboxMap;
   }
 
+  Future<void> _enableGlobeProjection() async {
+    final mapboxMap = _mapboxMap;
+    if (mapboxMap == null) {
+      return;
+    }
+    await mapboxMap.style.setProjection(
+      mbx.StyleProjection(name: mbx.StyleProjectionName.globe),
+    );
+  }
+
   void _updateCameraForFocus() {
     final mapboxMap = _mapboxMap;
     final focusCenter = widget.focusCenter;
@@ -417,7 +437,12 @@ class _MapboxMapLayerState extends State<_MapboxMapLayer> {
     }
 
     _didInitialFlyIn = true;
-    unawaited(mapboxMap.flyTo(camera, mbx.MapAnimationOptions(duration: 2600)));
+    unawaited(
+      mapboxMap.flyTo(
+        camera,
+        mbx.MapAnimationOptions(duration: 4200, startDelay: 350),
+      ),
+    );
   }
 
   Future<void> _projectMarkers() async {
@@ -968,40 +993,467 @@ class _TelegramLoginScreenState extends State<_TelegramLoginScreen> {
 
   @override
   Widget build(BuildContext context) {
+    final tokens = context.mapflowTokens;
+
     return Scaffold(
-      body: SafeArea(
-        child: Center(
-          child: SizedBox(
-            width: 320,
-            child: Column(
-              mainAxisSize: MainAxisSize.min,
-              children: [
-                Text(
-                  'MapFlow',
-                  style: Theme.of(context).textTheme.headlineMedium?.copyWith(
-                    fontWeight: FontWeight.w900,
-                    letterSpacing: 0,
-                  ),
+      backgroundColor: tokens.darkSurface,
+      body: Stack(
+        children: [
+          const Positioned.fill(child: _AnimatedEarthBackdrop()),
+          SafeArea(
+            child: Center(
+              child: SizedBox(
+                width: 320,
+                child: Column(
+                  mainAxisSize: MainAxisSize.min,
+                  children: [
+                    Text(
+                      'MapFlow',
+                      style: Theme.of(context).textTheme.headlineMedium
+                          ?.copyWith(
+                            color: tokens.onDark,
+                            fontWeight: FontWeight.w900,
+                            letterSpacing: 0,
+                          ),
+                    ),
+                    const SizedBox(height: 24),
+                    TelegramLoginButton(
+                      onPressed: _startLogin,
+                      loading: _loading,
+                    ),
+                    if (_message.isNotEmpty) ...[
+                      const SizedBox(height: 14),
+                      Text(
+                        _message,
+                        textAlign: TextAlign.center,
+                        style: Theme.of(
+                          context,
+                        ).textTheme.bodyMedium?.copyWith(color: tokens.onDark),
+                      ),
+                    ],
+                  ],
                 ),
-                const SizedBox(height: 24),
-                TelegramLoginButton(onPressed: _startLogin, loading: _loading),
-                if (_message.isNotEmpty) ...[
-                  const SizedBox(height: 14),
-                  Text(
-                    _message,
-                    textAlign: TextAlign.center,
-                    style: Theme.of(context).textTheme.bodyMedium,
-                  ),
-                ],
-              ],
+              ),
             ),
           ),
-        ),
+        ],
       ),
     );
   }
 }
 
+class _AnimatedEarthBackdrop extends StatefulWidget {
+  const _AnimatedEarthBackdrop({this.compact = false});
+
+  final bool compact;
+
+  @override
+  State<_AnimatedEarthBackdrop> createState() => _AnimatedEarthBackdropState();
+}
+
+class _AnimatedEarthBackdropState extends State<_AnimatedEarthBackdrop>
+    with SingleTickerProviderStateMixin {
+  late final AnimationController _controller;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = AnimationController(
+      vsync: this,
+      duration: const Duration(seconds: 18),
+    )..repeat();
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return RepaintBoundary(
+      child: AnimatedBuilder(
+        animation: _controller,
+        builder: (context, _) {
+          return CustomPaint(
+            painter: _EarthBackdropPainter(
+              progress: _controller.value,
+              tokens: context.mapflowTokens,
+              compact: widget.compact,
+            ),
+            child: const SizedBox.expand(),
+          );
+        },
+      ),
+    );
+  }
+}
+
+class _EarthBackdropPainter extends CustomPainter {
+  const _EarthBackdropPainter({
+    required this.progress,
+    required this.tokens,
+    required this.compact,
+  });
+
+  final double progress;
+  final MapflowThemeTokens tokens;
+  final bool compact;
+
+  static const _landMasses = <({double lon, double lat, double sx, double sy})>[
+    (lon: -106, lat: 42, sx: 0.30, sy: 0.18),
+    (lon: -82, lat: 18, sx: 0.20, sy: 0.14),
+    (lon: -62, lat: -14, sx: 0.22, sy: 0.25),
+    (lon: 16, lat: 8, sx: 0.23, sy: 0.31),
+    (lon: 46, lat: 48, sx: 0.34, sy: 0.18),
+    (lon: 78, lat: 25, sx: 0.32, sy: 0.20),
+    (lon: 116, lat: -23, sx: 0.19, sy: 0.13),
+    (lon: 137, lat: 36, sx: 0.10, sy: 0.07),
+    (lon: -42, lat: 73, sx: 0.16, sy: 0.08),
+  ];
+
+  static const _routes =
+      <({double fromLon, double fromLat, double toLon, double toLat})>[
+        (fromLon: -74, fromLat: 41, toLon: 2, toLat: 49),
+        (fromLon: 2, fromLat: 49, toLon: 105, toLat: 16),
+        (fromLon: 139, fromLat: 35, toLon: 105, toLat: 16),
+        (fromLon: -122, fromLat: 37, toLon: 139, toLat: 35),
+      ];
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    _paintSpace(canvas, size);
+    _paintOrbits(canvas, size);
+    _paintEarth(canvas, size);
+  }
+
+  void _paintSpace(Canvas canvas, Size size) {
+    final rect = Offset.zero & size;
+    canvas.drawRect(
+      rect,
+      Paint()
+        ..shader = LinearGradient(
+          begin: Alignment.topLeft,
+          end: Alignment.bottomRight,
+          colors: [
+            tokens.darkSurface,
+            const Color(0xFF07151B),
+            const Color(0xFF150918),
+            tokens.darkSurface,
+          ],
+        ).createShader(rect),
+    );
+
+    final glowCenter = Offset(size.width * 0.77, size.height * 0.18);
+    canvas.drawCircle(
+      glowCenter,
+      math.max(size.width, size.height) * 0.48,
+      Paint()
+        ..shader =
+            RadialGradient(
+              colors: [
+                const Color(0xFFFFB86B).withValues(alpha: 0.20),
+                tokens.voiceAccent.withValues(alpha: 0.08),
+                Colors.transparent,
+              ],
+              stops: const [0, 0.34, 1],
+            ).createShader(
+              Rect.fromCircle(
+                center: glowCenter,
+                radius: math.max(size.width, size.height) * 0.48,
+              ),
+            ),
+    );
+
+    final stars = Paint()..color = Colors.white;
+    for (var index = 0; index < 96; index++) {
+      final xSeed = math.sin(index * 12.9898) * 43758.5453;
+      final ySeed = math.sin(index * 78.233) * 24634.6345;
+      final x = (xSeed - xSeed.floor()) * size.width;
+      final y = (ySeed - ySeed.floor()) * size.height;
+      final twinkle = 0.35 + 0.65 * math.sin(progress * math.pi * 2 + index);
+      stars.color = Colors.white.withValues(alpha: 0.10 + twinkle * 0.28);
+      canvas.drawCircle(Offset(x, y), 0.7 + (index % 3) * 0.35, stars);
+    }
+  }
+
+  void _paintOrbits(Canvas canvas, Size size) {
+    final center = _earthCenter(size);
+    final radius = _earthRadius(size);
+    final orbitPaint = Paint()
+      ..style = PaintingStyle.stroke
+      ..strokeWidth = 1.1
+      ..color = const Color(0xFF5BE7C4).withValues(alpha: 0.15);
+
+    for (final scale in const [1.28, 1.48, 1.72]) {
+      canvas.save();
+      canvas.translate(center.dx, center.dy);
+      canvas.rotate(-0.46 + progress * math.pi * 0.18);
+      canvas.scale(1, 0.34);
+      canvas.drawCircle(Offset.zero, radius * scale, orbitPaint);
+      canvas.restore();
+    }
+
+    final satelliteAngle = progress * math.pi * 2;
+    final satellite = Offset(
+      center.dx + math.cos(satelliteAngle) * radius * 1.72,
+      center.dy + math.sin(satelliteAngle) * radius * 0.58,
+    );
+    canvas.drawCircle(
+      satellite,
+      3.6,
+      Paint()..color = const Color(0xFFFFD38A).withValues(alpha: 0.92),
+    );
+  }
+
+  void _paintEarth(Canvas canvas, Size size) {
+    final center = _earthCenter(size);
+    final radius = _earthRadius(size);
+    final sphere = Rect.fromCircle(center: center, radius: radius);
+
+    canvas.drawCircle(
+      center.translate(radius * 0.10, radius * 0.12),
+      radius * 1.06,
+      Paint()
+        ..shader = RadialGradient(
+          colors: [Colors.black.withValues(alpha: 0.46), Colors.transparent],
+        ).createShader(sphere.inflate(radius * 0.18)),
+    );
+
+    canvas.drawCircle(
+      center,
+      radius * 1.02,
+      Paint()
+        ..shader = RadialGradient(
+          center: const Alignment(-0.48, -0.62),
+          colors: [
+            const Color(0xFF8AF8FF).withValues(alpha: 0.32),
+            const Color(0xFF124968).withValues(alpha: 0.72),
+            Colors.transparent,
+          ],
+          stops: const [0, 0.64, 1],
+        ).createShader(sphere.inflate(radius * 0.18)),
+    );
+
+    canvas.save();
+    canvas.clipPath(Path()..addOval(sphere));
+    canvas.drawOval(
+      sphere,
+      Paint()
+        ..shader = RadialGradient(
+          center: const Alignment(-0.42, -0.50),
+          radius: 1.08,
+          colors: const [
+            Color(0xFF7AF6FF),
+            Color(0xFF1589B0),
+            Color(0xFF073456),
+            Color(0xFF030A1A),
+          ],
+          stops: [0, 0.34, 0.72, 1],
+        ).createShader(sphere),
+    );
+
+    _paintGrid(canvas, center, radius);
+    _paintLand(canvas, center, radius);
+    _paintRoutes(canvas, center, radius);
+    _paintTerminator(canvas, center, radius, sphere);
+    canvas.restore();
+
+    canvas.drawOval(
+      sphere,
+      Paint()
+        ..style = PaintingStyle.stroke
+        ..strokeWidth = 1.5
+        ..color = const Color(0xFFB7FFF5).withValues(alpha: 0.36),
+    );
+  }
+
+  void _paintGrid(Canvas canvas, Offset center, double radius) {
+    final paint = Paint()
+      ..style = PaintingStyle.stroke
+      ..strokeWidth = 0.8
+      ..color = Colors.white.withValues(alpha: 0.11);
+
+    for (final lat in const [-60, -30, 0, 30, 60]) {
+      final y = center.dy - math.sin(_radians(lat.toDouble())) * radius * 0.72;
+      final width = math.cos(_radians(lat.toDouble())) * radius;
+      canvas.drawOval(
+        Rect.fromCenter(
+          center: Offset(center.dx, y),
+          width: width * 2,
+          height: width * 0.38,
+        ),
+        paint,
+      );
+    }
+
+    for (var meridian = 0; meridian < 6; meridian++) {
+      canvas.save();
+      canvas.translate(center.dx, center.dy);
+      canvas.rotate((meridian / 6) * math.pi + progress * math.pi * 2);
+      canvas.scale(0.20, 1);
+      canvas.drawCircle(Offset.zero, radius, paint);
+      canvas.restore();
+    }
+  }
+
+  void _paintLand(Canvas canvas, Offset center, double radius) {
+    final landPaint = Paint()
+      ..color = const Color(0xFF4EDC9B).withValues(alpha: 0.86);
+    final highlightPaint = Paint()
+      ..color = const Color(0xFFFFD38A).withValues(alpha: 0.34);
+
+    for (final land in _landMasses) {
+      final projected = _project(land.lon, land.lat, center, radius);
+      if (projected == null) {
+        continue;
+      }
+      final (:point, :depth) = projected;
+      final alpha = (0.30 + depth * 0.70).clamp(0.0, 1.0);
+      landPaint.color = const Color(0xFF4EDC9B).withValues(alpha: alpha * 0.88);
+      highlightPaint.color = const Color(
+        0xFFFFD38A,
+      ).withValues(alpha: alpha * 0.26);
+      final landRect = Rect.fromCenter(
+        center: point,
+        width: radius * land.sx * (0.62 + depth * 0.58),
+        height: radius * land.sy * (0.56 + depth * 0.36),
+      );
+      canvas.save();
+      canvas.translate(point.dx, point.dy);
+      canvas.rotate(math.sin(land.lon) * 0.65);
+      canvas.translate(-point.dx, -point.dy);
+      canvas.drawOval(landRect, landPaint);
+      canvas.drawOval(landRect.deflate(radius * 0.018), highlightPaint);
+      canvas.restore();
+    }
+  }
+
+  void _paintRoutes(Canvas canvas, Offset center, double radius) {
+    final paint = Paint()
+      ..style = PaintingStyle.stroke
+      ..strokeCap = StrokeCap.round
+      ..strokeWidth = 1.4
+      ..color = tokens.voiceAccentSoft.withValues(alpha: 0.38);
+    final pulsePaint = Paint()
+      ..style = PaintingStyle.stroke
+      ..strokeCap = StrokeCap.round
+      ..strokeWidth = 2.8
+      ..color = tokens.voiceAccent.withValues(alpha: 0.44);
+
+    for (var index = 0; index < _routes.length; index++) {
+      final route = _routes[index];
+      final from = _project(route.fromLon, route.fromLat, center, radius);
+      final to = _project(route.toLon, route.toLat, center, radius);
+      if (from == null || to == null) {
+        continue;
+      }
+      final path = Path()
+        ..moveTo(from.point.dx, from.point.dy)
+        ..quadraticBezierTo(
+          (from.point.dx + to.point.dx) / 2,
+          math.min(from.point.dy, to.point.dy) - radius * (0.18 + index * 0.03),
+          to.point.dx,
+          to.point.dy,
+        );
+      canvas.drawPath(path, paint);
+      final metric = path.computeMetrics().first;
+      final head = ((progress + index * 0.19) % 1) * metric.length;
+      final segment = metric.extractPath(
+        math.max(0, head - metric.length * 0.12),
+        head,
+      );
+      canvas.drawPath(segment, pulsePaint);
+    }
+  }
+
+  void _paintTerminator(
+    Canvas canvas,
+    Offset center,
+    double radius,
+    Rect sphere,
+  ) {
+    canvas.drawOval(
+      sphere.shift(Offset(radius * 0.22, radius * 0.06)),
+      Paint()
+        ..shader = LinearGradient(
+          begin: Alignment.centerLeft,
+          end: Alignment.centerRight,
+          colors: [
+            Colors.transparent,
+            Colors.black.withValues(alpha: 0.18),
+            Colors.black.withValues(alpha: 0.68),
+          ],
+          stops: const [0, 0.52, 1],
+        ).createShader(sphere),
+    );
+    canvas.drawCircle(
+      center.translate(-radius * 0.28, -radius * 0.30),
+      radius * 0.22,
+      Paint()
+        ..shader =
+            RadialGradient(
+              colors: [
+                Colors.white.withValues(alpha: 0.22),
+                Colors.transparent,
+              ],
+            ).createShader(
+              Rect.fromCircle(
+                center: center.translate(-radius * 0.28, -radius * 0.30),
+                radius: radius * 0.22,
+              ),
+            ),
+    );
+  }
+
+  ({Offset point, double depth})? _project(
+    double lon,
+    double lat,
+    Offset center,
+    double radius,
+  ) {
+    final longitude = _radians(lon + progress * 360);
+    final latitude = _radians(lat);
+    final x = math.cos(latitude) * math.sin(longitude);
+    final z = math.cos(latitude) * math.cos(longitude);
+    if (z < -0.18) {
+      return null;
+    }
+    final y = -math.sin(latitude) * 0.72;
+    final depthScale = 0.72 + z * 0.28;
+    return (
+      point: Offset(
+        center.dx + x * radius * depthScale,
+        center.dy + y * radius * depthScale,
+      ),
+      depth: ((z + 0.18) / 1.18).clamp(0.0, 1.0),
+    );
+  }
+
+  Offset _earthCenter(Size size) {
+    if (compact) {
+      return Offset(size.width * 0.50, size.height * 0.39);
+    }
+    return Offset(size.width * 0.50, size.height * 0.40);
+  }
+
+  double _earthRadius(Size size) {
+    final base = math.min(size.width, size.height);
+    final radius = base * (compact ? 0.18 : 0.31);
+    return radius.clamp(116.0, compact ? 180.0 : 310.0);
+  }
+
+  double _radians(double degrees) => degrees * math.pi / 180;
+
+  @override
+  bool shouldRepaint(covariant _EarthBackdropPainter oldDelegate) {
+    return oldDelegate.progress != progress ||
+        oldDelegate.tokens != tokens ||
+        oldDelegate.compact != compact;
+  }
+}
+
 class _MapLoading extends StatelessWidget {
   const _MapLoading();
 
@@ -1010,43 +1462,48 @@ class _MapLoading extends StatelessWidget {
     final tokens = context.mapflowTokens;
     return Scaffold(
       backgroundColor: tokens.darkSurface,
-      body: Center(
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            ClipRRect(
-              borderRadius: BorderRadius.circular(tokens.panelRadius),
-              child: Image.network(
-                'icons/Icon-192.png',
-                width: 64,
-                height: 64,
-                errorBuilder: (_, _, _) => Icon(
-                  Icons.map_outlined,
-                  color: tokens.voiceAccent,
-                  size: 56,
+      body: Stack(
+        children: [
+          const Positioned.fill(child: _AnimatedEarthBackdrop(compact: true)),
+          Center(
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                ClipRRect(
+                  borderRadius: BorderRadius.circular(tokens.panelRadius),
+                  child: Image.network(
+                    'icons/Icon-192.png',
+                    width: 64,
+                    height: 64,
+                    errorBuilder: (_, _, _) => Icon(
+                      Icons.map_outlined,
+                      color: tokens.voiceAccent,
+                      size: 56,
+                    ),
+                  ),
                 ),
-              ),
+                const SizedBox(height: 18),
+                Text(
+                  'MapFlow',
+                  style: Theme.of(context).textTheme.titleLarge?.copyWith(
+                    color: tokens.onDark,
+                    fontWeight: FontWeight.w900,
+                    letterSpacing: 0,
+                  ),
+                ),
+                const SizedBox(height: 18),
+                SizedBox(
+                  width: 96,
+                  child: LinearProgressIndicator(
+                    minHeight: 3,
+                    color: tokens.voiceAccent,
+                    backgroundColor: tokens.onDark.withValues(alpha: 0.12),
+                  ),
+                ),
+              ],
             ),
-            const SizedBox(height: 18),
-            Text(
-              'MapFlow',
-              style: Theme.of(context).textTheme.titleLarge?.copyWith(
-                color: tokens.onDark,
-                fontWeight: FontWeight.w900,
-                letterSpacing: 0,
-              ),
-            ),
-            const SizedBox(height: 18),
-            SizedBox(
-              width: 96,
-              child: LinearProgressIndicator(
-                minHeight: 3,
-                color: tokens.voiceAccent,
-                backgroundColor: tokens.onDark.withValues(alpha: 0.12),
-              ),
-            ),
-          ],
-        ),
+          ),
+        ],
       ),
     );
   }