Flutter路径动画插件path_animator的使用

Path Animator

A flutter package to draw path with animation on canvas.

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Features

• ✅ Animated Path Drawing

Demo

Getting Started

包含插件到项目中

在 pubspec.yaml 文件中添加 path_animator 插件：

dependencies:
  path_animator: <latest version>

运行 pub get 来获取包。

构建动画路径

build 函数创建动画路径并返回它。

final animatedPath = PathAnimator.build(
    path: path,
    animationPercent: controller.value,
);

返回的动画路径然后用于在画布上绘制路径。

canvas.drawPath(animatedPath, paint);

Example

完整示例代码

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

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Path Animator',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Path Animator'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({
    Key? key,
    required this.title,
  }) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  AnimationController? _controller;

  @override
  void initState() {
    _controller = AnimationController(
      duration: const Duration(seconds: 1),
      vsync: this,
    );

    WidgetsBinding.instance!.addPostFrameCallback((_) {
      _controller!.forward();
    });

    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: CustomPaint(
        child: const SizedBox(width: 500, height: 500),
        painter: _MyCustomPainter(
          controller: _controller!,
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          _controller!.reset();
          _controller!.forward();
        },
        tooltip: 'Reset',
        child: const Icon(Icons.refresh),
      ),
    );
  }
}

class _MyCustomPainter extends CustomPainter {
  _MyCustomPainter({
    required this.controller,
  }) : super(repaint: controller);

  final AnimationController controller;

  @override
  void paint(Canvas canvas, Size size) {
    final path = Path();
    path.moveTo(0.0, size.height * 0.25);
    path.lineTo(size.width * 0.25, size.height * 0.75);
    path.lineTo(size.width * 0.75, size.height * 0.75);
    path.lineTo(size.width, size.height * 0.25);
    path.close();

    // draw graph
    final path1 = Path();
    final animatedPath = PathAnimator.build(
      path: path,
      animationPercent: controller.value,
    );

    final paint = Paint()
      ..color = Colors.black
      ..style = PaintingStyle.stroke
      ..strokeWidth = 2.0;

    canvas.drawPath(animatedPath, paint);
  }

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

Project Created & Maintained By

Divyanshu Shekhar

Contributions

Contributions are welcomed!

If you feel that a hook is missing, feel free to open a pull-request.

For a custom-hook to be merged, you will need to do the following:

• Describe the use-case.
• Open an issue explaining why we need this hook, how to use it, etc. This is important as a hook will not get merged if the hook doesn’t appeal to a large number of people.
• If your hook is rejected, don’t worry! A rejection doesn’t mean that it won’t be merged later in the future if more people show an interest in it. In the meantime, feel free to publish your hook as a package on https://pub.dev.
• A hook will not be merged unless fully tested, to avoid breaking it inadvertently in the future.

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Copyright & License

Code and documentation Copyright © 2021 DevsOnFlutter. Code released under the BSD 3-Clause License.