crashy path

main.dart

import 'dart:io';
import 'dart:math' as math;

import 'package:flutter/material.dart';

void main() {
  runApp(Example());
}

class Example extends StatefulWidget {
  const Example({super.key});

  @override
  State<Example> createState() => _ExampleState();
}

class _ExampleState extends State<Example>
    with SingleTickerProviderStateMixin {
  late AnimationController _controller;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(vsync: this, duration: Duration(hours: 1));
    _controller.addListener(() {
      // setState(() {

      // });
    });
    _controller.forward(from: 0);
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Center(
      child: CustomPaint(
        painter: HeartPainter(),
        size: Size(400, 400),
      ));
    }
}

class HeartPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    var random = math.Random(123);
    // Calculate the center of the canvas.
    Offset center = size.center(Offset.zero);

    // Calculate the radius of the heart.
    double radius = math.min(size.width, size.height) / 2;

    // Create a path for the heart.
    Path path = Path();
    for (var i = 0; i < 12; i++) {
      var x1 = center.dx  + (500 * (random.nextDouble() - 0.5));
      var y1 = center.dy + (500 * (random.nextDouble() - 0.5));
      var x2 = center.dx  + (500 * (random.nextDouble() - 0.5));
      var y2 = center.dy + (500 * (random.nextDouble() - 0.5));
      path.cubicTo(
        x1,
        y1,
        x2,
        y2,
        center.dx,
        center.dy,
      );
    }
    path.close();


    // Paint the heart.
    Paint paint = Paint()
      ..style = PaintingStyle.stroke
      ..color = Colors.red
      ..strokeWidth = 5.0
      ..strokeCap = StrokeCap.round;
    canvas.drawPath(path, paint);
  }

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