bessel_tween 0.1.1

bessel_tween #

贝塞尔曲线补间动画,用来实现一个Widget按照贝塞尔曲线路径移动。 可实现多阶贝塞尔曲线

  • 安装bessel_tween

    修改yaml

      dependencies:
        bessel_tween: ^0.1.0
    

    安装

      $ flutter packages get
    
  • 使用bessel_tween

    
      import 'package:flutter/animation.dart';
      import 'package:bessel_tween/bessel_tween.dart';
    
      void initState() {  
          // 定义3个控制点,可以更多
          pointList = [Offset(0, 0), Offset(250, 20), Offset(300, 300)];
          AnimationController controller = AnimationController(duration: Duration(milliseconds: 3000), vsync: this);
          Animation<Offset> besselAnimation = BesselTween(pointList).animate(controller);
          controller.addListener(() {
                setState(() {
                //改变 Widget 的位置
                widgetOffset = besselAnimation.value;
              });
              });
          controller.forward();
      }
    
  • 运行效果动图

    运行效果图

    实现效果的代码在example里,debug模式会有点卡顿,在release模式里就会极其丝滑

最后感谢 https://blog.csdn.net/aimeimeits/article/details/72809382 这篇文章的作者。

本package的算法部分来自于上面那篇文章

[0.1.0] - 发布第一个版本

  • 可输入一系列的贝塞尔曲线控制点,然后根据时间(0~1)计算出点的坐标

example/README.md

example #

A new Flutter project.

Getting Started #

This project is a starting point for a Flutter application.

A few resources to get you started if this is your first Flutter project:

For help getting started with Flutter, view our online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:


dependencies:
  bessel_tween: ^0.1.1

2. Install it

You can install packages from the command line:

with Flutter:


$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:


import 'package:bessel_tween/bessel_tween.dart';
  
Popularity:
Describes how popular the package is relative to other packages. [more]
5
Health:
Code health derived from static analysis. [more]
100
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
100
Overall:
Weighted score of the above. [more]
52
Learn more about scoring.

We analyzed this package on Aug 18, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.4.0
  • pana: 0.12.19
  • Flutter: 1.7.8+hotfix.4

Platforms

Detected platforms: Flutter

References Flutter, and has no conflicting libraries.

Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.6 1.1.7
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies
flutter_test