A simple example I made while learning about custom paints in Flutter with CustomPaint and CustomPainter.
This is part of an article I wrote in DEV.to and Medium, check them out!
Last active
June 23, 2024 23:30
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Basic audio waveform in Flutter
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| import 'package:flutter/material.dart'; | |
| import 'dart:math'; | |
| void main() { | |
| runApp(App()); | |
| } | |
| final class App extends StatelessWidget { | |
| const App({super.key}); | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| home: Scaffold( | |
| body: Container( | |
| alignment: Alignment.center, | |
| color: Color(0xFF16161B), | |
| child: FittedBox( | |
| child: Container( | |
| width: 400, | |
| height: 100, | |
| child: CustomPaint( | |
| painter: WavePainter(), | |
| ) | |
| ) | |
| ), | |
| ), | |
| ), | |
| ); | |
| } | |
| } | |
| final class WavePainter extends CustomPainter { | |
| @override | |
| void paint(Canvas canvas, Size size) { | |
| final brush = Paint() | |
| ..color = Color(0xFFFAFAFA) | |
| ..strokeWidth = 3 | |
| ..strokeCap = StrokeCap.round; | |
| var shift = 0.0; | |
| final verticalCenter = size.height / 2; | |
| final values = List<double>.generate(100, (_) { | |
| return Random().nextDouble() * verticalCenter; | |
| }); | |
| for (var i = 0; i < values.length && shift < size.width; i++) { | |
| canvas.drawLine( | |
| Offset(shift, verticalCenter - values[i]), | |
| Offset(shift, verticalCenter + values[i]), | |
| brush | |
| ); | |
| shift += 6; | |
| } | |
| } | |
| @override | |
| bool shouldRepaint(CustomPainter oldDelegate) => false; | |
| } |
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