smiley.dart

// Copyright 2019 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. import 'package:flutter/material.dart'; import 'dart:math' as Math; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Smiley Face', home: Scaffold( body: Container( constraints: BoxConstraints.expand(), child: Smiley(), )), ); } } class Smiley extends StatelessWidget { @override Widget build(BuildContext context) { return CustomPaint( painter: SmileyPainter(), ); } } class SmileyPainter extends CustomPainter { @override void paint(Canvas canvas, Size size) { final radius = Math.min(size.width, size.height) / 2; final center = Offset(size.width / 2, size.height / 2); // Draw the body final paint = Paint()..color = Colors.yellow; canvas.drawCircle(center, radius, paint); // Draw the mouth final smilePaint = Paint() ..style = PaintingStyle.stroke ..strokeWidth = 10; canvas.drawArc(Rect.fromCircle(center: center, radius: radius / 2), 0, Math.pi, false, smilePaint); // Draw the eyes canvas.drawCircle( Offset(center.dx - radius / 2, center.dy - radius / 2), 10, Paint()); canvas.drawCircle( Offset(center.dx + radius / 2, center.dy - radius / 2), 10, Paint()); } @override bool shouldRepaint(CustomPainter oldDelegate) => false; }