Flutter Fluid Fill Animation code

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import 'dart:async'; import 'dart:math'; import 'package:flutter/material.dart'; import 'package:provider/provider.dart'; void main() { runApp( ChangeNotifierProvider<AnimationData>( create: (context) => AnimationData(), builder: (context, child) => const MyApp(), ), ); } class AnimationData extends ChangeNotifier { double _percentage = 0.0; bool _isAnimationRunning = false; double get percentage => _percentage; bool get isAnimationRunning => _isAnimationRunning; set percentage(double value) { _percentage = value; notifyListeners(); } void startAnimation() { if (_isAnimationRunning) return; _isAnimationRunning = true; Timer.periodic(const Duration(milliseconds: 30), (timer) { if (_percentage < 1.0) { _percentage += 0.01; notifyListeners(); } else { timer.cancel(); _isAnimationRunning = false; } }); } void resetAnimation() { _percentage = 0.0; notifyListeners(); } } class MyApp extends StatelessWidget { const MyApp({Key? key}) : super(key: key); @override Widget build(BuildContext context) { return MaterialApp( title: 'Fluid Fill Animation', theme: ThemeData(primarySwatch: Colors.blue), home: const MyHomePage(), ); } } class MyHomePage extends StatefulWidget { const MyHomePage({Key? key}) : super(key: key); @override State<MyHomePage> createState() => _MyHomePageState(); } class _MyHomePageState extends State<MyHomePage> { @override void initState() { super.initState(); WidgetsBinding.instance.addPostFrameCallback((_) { Provider.of<AnimationData>(context, listen: false).startAnimation(); }); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: const Text('Fluid Fill Animation')), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ const FluidCircle(), const SizedBox(height: 20), Row( mainAxisAlignment: MainAxisAlignment.center, children: [ ElevatedButton( onPressed: () { Provider.of<AnimationData>( context, listen: false, ).startAnimation(); }, child: const Text('Start Animation'), ), const SizedBox(width: 20), ElevatedButton( onPressed: () { Provider.of<AnimationData>( context, listen: false, ).resetAnimation(); }, child: const Text('Reset Animation'), ), ], ), ], ), ), ); } } class FluidCircle extends StatelessWidget { const FluidCircle({Key? key}) : super(key: key); @override Widget build(BuildContext context) { final animationData = Provider.of<AnimationData>(context); return CustomPaint( painter: FluidPainter(animationData.percentage), size: const Size(200, 200), ); } } class FluidPainter extends CustomPainter { final double percentage; FluidPainter(this.percentage); @override void paint(Canvas canvas, Size size) { final center = size.center(Offset.zero); final radius = size.width / 2; // Define the wave parameters final waveAmplitude = radius / 20; final waveFrequency = 5.0; // Calculate the current water level final waterLevel = radius - (radius * 2 * percentage); // Create the path for the filled portion with wave effect final filledPath = Path(); // Move to the starting point on the left, start from above the circle to avoid unfilled area filledPath.moveTo(0, center.dy + waterLevel - waveAmplitude); // Draw the wave for (double x = 0; x <= size.width; x += 1) { final y = center.dy + waterLevel + waveAmplitude * sin(waveFrequency * (x / radius) + percentage * 2 * pi); filledPath.lineTo(x, y); } // Complete the path to close the filled area filledPath.lineTo(size.width, size.height); filledPath.lineTo(0, size.height); filledPath.close(); // Clip the path to the circle canvas.clipPath( Path()..addOval(Rect.fromCircle(center: center, radius: radius)), ); // Draw the filled portion final filledPaint = Paint()..color = Colors.blue; canvas.drawPath(filledPath, filledPaint); // Draw the circle outline final circlePaint = Paint() ..color = Colors.blue ..style = PaintingStyle.stroke ..strokeWidth = 4; canvas.drawCircle(center, radius, circlePaint); // Draw the percentage text final textPainter = TextPainter( text: TextSpan( text: '${(percentage * 100).toStringAsFixed(0)}%', style: TextStyle( color: (percentage * 100) > 50 ? Colors.white : Colors.grey, fontSize: 24, ), ), textDirection: TextDirection.ltr, textAlign: TextAlign.center, ); textPainter.layout(minWidth: size.width, maxWidth: size.width); textPainter.paint( canvas, center - Offset(textPainter.width / 2, textPainter.height / 2), ); } @override bool shouldRepaint(covariant FluidPainter oldDelegate) { return oldDelegate.percentage != percentage; } }