用CustomPainter绘制心形图

import 'package:flutter/material.dart';

class HeartPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..color = Colors.red
      ..style = PaintingStyle.fill;

    final path = Path();
    path.moveTo(size.width / 2, size.height / 4);
    path.cubicTo(
        size.width / 4, 0, 0, size.height / 4, 0, size.height / 2);
    path.cubicTo(
        0, 3 * size.height / 4, size.width / 2, size.height, size.width, 3 * size.height / 4);
    path.cubicTo(
        size.width, size.height / 2, 3 * size.width / 4, 0, size.width / 2, size.height / 4);

    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) {
    return false;
  }
}

class HeartPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Heart Shape'),
      ),
      body: Center(
        child: CustomPaint(
          painter: HeartPainter(),
          size: Size(200, 200),
        ),
      ),
    );
  }
}