Flutter:如何在画布上绘制图标？

import 'package:flutter/material.dart';

class IconPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    // 在画布上绘制图标
    // 这里可以使用Canvas提供的各种绘制方法，如drawLine、drawRect、drawCircle等
  }

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

class IconWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return CustomPaint(
      painter: IconPainter(),
    );
  }
}

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

    canvas.drawCircle(Offset(size.width / 2, size.height / 2), size.width / 2, paint);
  }

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

class CircleIconWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return CustomPaint(
      painter: CircleIconPainter(),
      size: Size(48, 48),
    );
  }
}