Flutter图形绘制插件figma_squircle_updated的使用

当然，以下是一个关于如何使用 figma_squircle_updated Flutter 插件进行图形绘制的示例代码。这个插件允许你在 Flutter 应用中绘制 Squircle（方形圆角）图形。

首先，确保你已经在 pubspec.yaml 文件中添加了 figma_squircle_updated 依赖：

dependencies:
  flutter:
    sdk: flutter
  figma_squircle_updated: ^最新版本号

然后运行 flutter pub get 来获取依赖。

接下来，你可以在 Flutter 应用中使用这个插件来绘制 Squircle。以下是一个完整的示例代码：

import 'package:flutter/material.dart';
import 'package:figma_squircle_updated/figma_squircle_updated.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: SquircleDemo(),
    );
  }
}

class SquircleDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Squircle Demo'),
      ),
      body: Center(
        child: CustomPaint(
          size: Size(300, 300),
          painter: SquirclePainter(
            color: Colors.blue,
            rect: Rect.fromLTWH(50, 50, 200, 200),
            borderRadius: BorderRadius.circular(50), // This is actually used for squircle effect
            squircleRatio: 0.5, // Adjust this value to change the squircle shape
          ),
        ),
      ),
    );
  }
}

class SquirclePainter extends CustomPainter {
  final Color color;
  final Rect rect;
  final BorderRadius borderRadius;
  final double squircleRatio;

  SquirclePainter({
    required this.color,
    required this.rect,
    required this.borderRadius,
    required this.squircleRatio,
  });

  @override
  void paint(Canvas canvas, Size size) {
    final Paint paint = Paint()
      ..color = color
      ..style = PaintingStyle.fill;

    // Calculate the squircle path
    final Path path = SquirclePath()
        .addOval(rect, borderRadius: borderRadius, squircleRatio: squircleRatio);

    canvas.drawPath(path, paint);
  }

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

// Note: SquirclePath is a hypothetical class since figma_squircle_updated does not provide a direct SquirclePath.
// You may need to implement the squircle path calculation yourself using the provided ratio.
// Below is a simplified version of how you might calculate a squircle path:
class SquirclePath {
  Path addOval(Rect rect, {required BorderRadius borderRadius, required double squircleRatio}) {
    final Path path = Path();
    final double width = rect.width;
    final double height = rect.height;
    final double radiusX = width / 2;
    final double radiusY = height / 2;
    final double cornerSize = radiusX * squircleRatio; // Adjust corner size based on squircle ratio

    // Top-left corner
    path.moveTo(rect.left + cornerSize, rect.top);
    path.quadraticBezierTo(
      rect.left,
      rect.top,
      rect.left,
      rect.top + cornerSize,
    );

    // Top-right corner
    path.quadraticBezierTo(
      rect.left,
      rect.top + radiusY - cornerSize,
      rect.right - cornerSize,
      rect.top + radiusY,
    );
    path.lineTo(rect.right - cornerSize, rect.bottom - radiusY);

    // Bottom-right corner
    path.quadraticBezierTo(
      rect.right,
      rect.bottom - radiusY,
      rect.right,
      rect.bottom - cornerSize,
    );
    path.lineTo(rect.right, rect.bottom - cornerSize);

    // Bottom-left corner
    path.quadraticBezierTo(
      rect.right,
      rect.bottom,
      rect.right - cornerSize,
      rect.bottom - radiusY + cornerSize,
    );
    path.lineTo(rect.left + cornerSize, rect.bottom - radiusY + cornerSize);

    // Closing the path to form a squircle shape
    path.quadraticBezierTo(
      rect.left + radiusX - cornerSize,
      rect.bottom,
      rect.left + radiusX,
      rect.bottom - cornerSize,
    );
    path.lineTo(rect.left + radiusX, rect.top + cornerSize);

    // Completing the top-left corner
    path.quadraticBezierTo(
      rect.left + radiusX,
      rect.top,
      rect.left + cornerSize,
      rect.top,
    );

    path.close();
    return path;
  }
}

注意：

1. figma_squircle_updated 插件可能并没有直接提供一个 SquirclePath 类。上述代码中的 SquirclePath 类是一个假设的实现，用于展示如何根据 squircle ratio 计算路径。
2. 实际的插件使用可能会有所不同，请参考插件的官方文档和示例代码进行调整。
3. 由于 figma_squircle_updated 插件的具体 API 可能会随时间变化，请查阅最新的插件文档以确保代码的准确性。

如果你发现 figma_squircle_updated 插件提供了直接的 Squircle 绘制方法，那么你应该直接使用插件提供的方法，而不是自己实现路径计算。