https://github.com/hathibelagal-dev/path_morph_for_flutter

This is a Flutter package that lets you smoothly morph one path into another.
https://github.com/hathibelagal-dev/path_morph_for_flutter

animation flutter path

Last synced: about 2 months ago
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This is a Flutter package that lets you smoothly morph one path into another.

• Host: GitHub
• URL: https://github.com/hathibelagal-dev/path_morph_for_flutter
• Owner: hathibelagal-dev
• License: apache-2.0
• Created: 2019-02-15T07:04:31.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2023-05-20T21:01:05.000Z (over 1 year ago)
• Last Synced: 2023-08-20T22:53:34.744Z (over 1 year ago)
• Topics: animation, flutter, path
• Language: C++
• Homepage: https://pub.dev/packages/path_morph
• Size: 1.09 MB
• Stars: 35
• Watchers: 0
• Forks: 7
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

        
# Path Morph

This is a pure Dart package that lets you smoothly morph one Flutter `Path` object into another. You can think of this as a path tween animation. The idea is to take two paths, a source path and a destination path, and smoothly move the points of the source path until it looks exactly like the destination path.

![](https://raw.githubusercontent.com/hathibelagal-dev/path_morph_for_flutter/master/example.gif)

## Usage

First you need to sample two paths using the `PathMorph.samplePaths()` method, which returns a `SampledPathData` object.

```

SampledPathData data = PathMorph.samplePaths(path1, path2);

```

Then you call the `PathMorph.generateAnimations()` method to create an animation for every point in the path. This method needs an `AnimationController` object and a `SampledPathData` object as arguments. Additionally, it expects you to pass a function to it, one that takes two arguments itself. In the body of the function, you must call `setState()` and update the value of the `shiftedPoints` list, which is present in the `SampledPathData` object.

```

AnimationController controller = AnimationController(vsync: this,

                                    duration: Duration(seconds: 1));

PathMorph.generateAnimations(controller, data, (i,z) {

    setState((){

      data.shiftedPoints[i] = z;

    });

});

```

Lastly, while rendering the morph animation, you can call the `PathMorph.generatePath()` method and pass the `shiftedPoints` list to it. This returns a `Path` object you can draw on your canvas. If you are using a `CustomPainter` object, you'll want to pass the path as an argument to it.

```

@override

Widget build(BuildContext context) {

    return CustomPaint(painter: MyPainter(PathMorph.generatePath(data)));

}

```

Do take a look at the example project to get a better idea.

## Important

This package currently allows you to morph two paths only if they both have an equal number of contours. You can think of a contour as a line you can draw without lifting the pen. For example, the path to draw a triangle, a circle, or a square has one contour only. But a path to draw two concentric circles will have two contours.