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| | import 'dart:math' as math;
| | import 'package:flutter/material.dart';
| |
| | /// PAILot animated splash screen.
| | ///
| | /// Phase 1 (~0-1500ms): The P logo reveals itself progressively from top to
| | /// bottom, as if being drawn by an invisible pen.
| | ///
| | /// Phase 2 (~1000-1700ms): A paper airplane flies in from the left, arcing
| | /// across the P.
| | ///
| | /// After animation completes the [onComplete] callback fires.
| | class SplashScreen extends StatefulWidget {
| | final VoidCallback onComplete;
| |
| | const SplashScreen({super.key, required this.onComplete});
| |
| | @override
| | State<SplashScreen> createState() => _SplashScreenState();
| | }
| |
| | class _SplashScreenState extends State<SplashScreen>
| | with TickerProviderStateMixin {
| | late final AnimationController _drawController;
| | late final AnimationController _planeController;
| | late final AnimationController _fadeController;
| |
| | static const Duration _drawDuration = Duration(milliseconds: 1500);
| | static const Duration _planeDuration = Duration(milliseconds: 700);
| | static const Duration _fadeDuration = Duration(milliseconds: 300);
| |
| | @override
| | void initState() {
| | super.initState();
| |
| | _drawController =
| | AnimationController(vsync: this, duration: _drawDuration);
| | _planeController =
| | AnimationController(vsync: this, duration: _planeDuration);
| | _fadeController =
| | AnimationController(vsync: this, duration: _fadeDuration);
| |
| | _startSequence();
| | }
| |
| | Future<void> _startSequence() async {
| | await Future.delayed(const Duration(milliseconds: 50));
| | if (!mounted) return;
| |
| | _drawController.forward();
| |
| | await Future.delayed(const Duration(milliseconds: 1000));
| | if (!mounted) return;
| | _planeController.forward();
| |
| | await Future.delayed(const Duration(milliseconds: 800));
| | if (!mounted) return;
| |
| | await _fadeController.forward();
| | if (!mounted) return;
| | widget.onComplete();
| | }
| |
| | @override
| | void dispose() {
| | _drawController.dispose();
| | _planeController.dispose();
| | _fadeController.dispose();
| | super.dispose();
| | }
| |
| | @override
| | Widget build(BuildContext context) {
| | return Scaffold(
| | backgroundColor: const Color(0xFF111217),
| | body: FadeTransition(
| | opacity: Tween<double>(begin: 1.0, end: 0.0).animate(
| | CurvedAnimation(parent: _fadeController, curve: Curves.easeIn),
| | ),
| | child: Center(
| | child: Column(
| | mainAxisSize: MainAxisSize.min,
| | children: [
| | AnimatedBuilder(
| | animation:
| | Listenable.merge([_drawController, _planeController]),
| | builder: (context, child) {
| | return CustomPaint(
| | size: const Size(300, 300),
| | painter: _PLogoWithPlanePainter(
| | drawProgress: _drawController.value,
| | planeProgress: _planeController.value,
| | ),
| | );
| | },
| | ),
| | const SizedBox(height: 24),
| | AnimatedBuilder(
| | animation: _drawController,
| | builder: (context, child) {
| | return Opacity(
| | opacity: _drawController.value.clamp(0.0, 1.0),
| | child: const Text(
| | 'PAILot',
| | style: TextStyle(
| | color: Color(0xFF00C7FF),
| | fontSize: 28,
| | fontWeight: FontWeight.w300,
| | letterSpacing: 6,
| | ),
| | ),
| | );
| | },
| | ),
| | ],
| | ),
| | ),
| | ),
| | );
| | }
| | }
| |
| | class _PLogoWithPlanePainter extends CustomPainter {
| | final double drawProgress;
| | final double planeProgress;
| |
| | const _PLogoWithPlanePainter({
| | required this.drawProgress,
| | required this.planeProgress,
| | });
| |
| | @override
| | void paint(Canvas canvas, Size size) {
| | const double svgW = 519.2;
| | const double svgH = 519.3;
| |
| | final double scale = math.min(size.width / svgW, size.height / svgH);
| | final double offsetX = (size.width - svgW * scale) / 2;
| | final double offsetY = (size.height - svgH * scale) / 2;
| |
| | canvas.save();
| | canvas.translate(offsetX, offsetY);
| | canvas.scale(scale, scale);
| |
| | _drawPLogo(canvas);
| | _drawPlane(canvas);
| |
| | canvas.restore();
| | }
| |
| | void _drawPLogo(Canvas canvas) {
| | if (drawProgress <= 0) return;
| |
| | final paths = _buildPPaths();
| |
| | Rect bounds = paths.first.getBounds();
| | for (final p in paths.skip(1)) {
| | bounds = bounds.expandToInclude(p.getBounds());
| | }
| |
| | final double revealY = bounds.top +
| | bounds.height * Curves.easeInOut.transform(drawProgress);
| |
| | canvas.save();
| | canvas.clipRect(Rect.fromLTRB(
| | bounds.left - 10,
| | bounds.top - 10,
| | bounds.right + 10,
| | revealY + 6,
| | ));
| |
| | final Paint gradientPaint = Paint()
| | ..shader = const LinearGradient(
| | begin: Alignment.topLeft,
| | end: Alignment.bottomRight,
| | colors: [Color(0xFF0000FF), Color(0xFF00C7FF)],
| | ).createShader(Rect.fromLTWH(0, 0, 519.2, 519.3))
| | ..style = PaintingStyle.fill
| | ..isAntiAlias = true;
| |
| | for (final p in paths) {
| | canvas.drawPath(p, gradientPaint);
| | }
| |
| | canvas.restore();
| | }
| |
| | List<Path> _buildPPaths() {
| | final path1 = Path();
| | path1.moveTo(149.4, 68.3);
| | path1.lineTo(191.1, 155.4);
| | path1.lineTo(300.6, 151.2);
| | path1.cubicTo(301.3, 151.2, 302.0, 151.1, 302.7, 151.1);
| | path1.cubicTo(324.8, 151.1, 343.0, 169.0, 343.0, 191.4);
| | path1.cubicTo(343.0, 201.3, 339.4, 210.4, 333.5, 217.4);
| | path1.cubicTo(366.8, 193.1, 389.3, 153.8, 389.3, 109.5);
| | path1.cubicTo(389.3, 69.5, 371.7, 24.8, 343.9, 0.3);
| | path1.cubicTo(339.9, 0.0, 335.8, -0.1, 331.7, -0.1);
| | path1.lineTo(0, -0.1);
| | path1.lineTo(0, 5.4);
| | path1.cubicTo(0, 81.7, 59.8, 152.7, 134.9, 156.8);
| | path1.lineTo(107.3, 68.3);
| | path1.close();
| |
| | final path2 = Path();
| | path2.moveTo(518.9, 175.6);
| | path2.cubicTo(515.9, 128.6, 495.7, 86.3, 464.4, 55.0);
| | path2.cubicTo(433.2, 23.8, 391.1, 3.6, 344.4, 0.5);
| | path2.cubicTo(344.3, 0.5, 344.2, 0.6, 344.3, 0.7);
| | path2.cubicTo(372.0, 25.2, 389.5, 69.8, 389.5, 109.6);
| | path2.cubicTo(389.5, 151.9, 364.4, 195.1, 333.7, 217.5);
| | path2.cubicTo(327.9, 224.3, 319.9, 229.2, 310.9, 231.0);
| | path2.cubicTo(293.9, 238.9, 275.2, 243.4, 255.9, 243.4);
| | path2.cubicTo(274.9, 243.4, 293.3, 239.1, 310.1, 231.4);
| | path2.cubicTo(310.2, 231.3, 310.2, 231.1, 310.0, 231.2);
| | path2.cubicTo(307.1, 231.7, 304.0, 231.9, 300.9, 231.8);
| | path2.lineTo(191.5, 227.6);
| | path2.lineTo(191.4, 227.7);
| | path2.lineTo(149.7, 314.7);
| | path2.lineTo(149.6, 314.8);
| | path2.lineTo(107.7, 314.8);
| | path2.cubicTo(107.6, 314.8, 107.6, 314.7, 107.6, 314.6);
| | path2.lineTo(135.1, 226.2);
| | path2.cubicTo(135.1, 226.1, 135.1, 226.0, 135.0, 226.0);
| | path2.cubicTo(59.7, 230.2, 0, 283.6, 0, 359.9);
| | path2.lineTo(0, 375.0);
| | path2.lineTo(0, 516.6);
| | path2.cubicTo(0, 516.7, 0.2, 516.8, 0.2, 516.6);
| | path2.cubicTo(29.6, 429.6, 111.9, 374.7, 208.9, 374.7);
| | path2.lineTo(298.2, 374.7);
| | path2.lineTo(298.4, 375.0);
| | path2.lineTo(329.8, 375.0);
| | path2.cubicTo(439.7, 375.0, 525.7, 285.2, 518.9, 175.6);
| | path2.close();
| |
| | final path3 = Path();
| | path3.moveTo(208.9, 374.5);
| | path3.cubicTo(111.7, 374.5, 29.2, 429.6, 0, 517.0);
| | path3.lineTo(0, 519.2);
| | path3.lineTo(158.7, 519.2);
| | path3.lineTo(159.0, 417.6);
| | path3.cubicTo(158.8, 393.9, 178.0, 374.6, 201.7, 374.6);
| | path3.lineTo(298.4, 374.6);
| |
| | return [path1, path2, path3];
| | }
| |
| | void _drawPlane(Canvas canvas) {
| | if (planeProgress <= 0) return;
| |
| | const double startX = -80.0, startY = 290.0;
| | const double ctrlX = 260.0, ctrlY = 100.0;
| | const double endX = 480.0, endY = 250.0;
| |
| | final double t = planeProgress;
| | final double mt = 1.0 - t;
| |
| | final double px = mt * mt * startX + 2 * mt * t * ctrlX + t * t * endX;
| | final double py = mt * mt * startY + 2 * mt * t * ctrlY + t * t * endY;
| |
| | final double dx = 2 * mt * (ctrlX - startX) + 2 * t * (endX - ctrlX);
| | final double dy = 2 * mt * (ctrlY - startY) + 2 * t * (endY - ctrlY);
| | final double angle = math.atan2(dy, dx);
| |
| | double alpha = 1.0;
| | if (t < 0.15) {
| | alpha = t / 0.15;
| | } else if (t > 0.9) {
| | alpha = (1.0 - t) / 0.1;
| | }
| |
| | canvas.save();
| | canvas.translate(px, py);
| | canvas.rotate(angle);
| |
| | const double s = 30.0;
| | final Paint bodyPaint = Paint()
| | ..color = Color.fromRGBO(0, 199, 255, alpha)
| | ..style = PaintingStyle.fill
| | ..isAntiAlias = true;
| | final Paint edgePaint = Paint()
| | ..color = Color.fromRGBO(255, 255, 255, alpha * 0.6)
| | ..style = PaintingStyle.stroke
| | ..strokeWidth = 1.5
| | ..isAntiAlias = true;
| |
| | final Path plane = Path()
| | ..moveTo(s, 0)
| | ..lineTo(-s * 0.6, -s * 0.55)
| | ..lineTo(-s * 0.2, 0)
| | ..lineTo(-s * 0.6, s * 0.55)
| | ..close();
| |
| | canvas.drawPath(plane, bodyPaint);
| | canvas.drawPath(plane, edgePaint);
| |
| | canvas.drawLine(
| | Offset(s, 0),
| | Offset(-s * 0.2, 0),
| | Paint()
| | ..color = Color.fromRGBO(255, 255, 255, alpha * 0.4)
| | ..strokeWidth = 1.0,
| | );
| |
| | canvas.restore();
| | }
| |
| | @override
| | bool shouldRepaint(_PLogoWithPlanePainter old) =>
| | old.drawProgress != drawProgress || old.planeProgress != planeProgress;
| | }
|
|
