signature 3.2.0

Flutter Android iOS web

A Flutter plugin providing performance optimized signature canvas with ability to set custom style, boundaries and initial state.

signature #

pub package

A Flutter plugin providing performance optimized signature canvas with ability to set custom style, boundaries and initial state. This is native flutter implementation, so it supports all platforms.

Why #

In time of creation of this plugin, there was no available solution that had:

  • required performance on wide range of devices
  • ability to set canvas boundaries
  • ability to initialize using previously saved state

Usage #

To use this plugin, add signature as a dependency in your pubspec.yaml file.

Example #

// IMPORT PACKAGE
import 'package:signature/signature.dart';

// Initialise a controller. It will contains signature points, stroke width and pen color.
// It will allow you to interact with the widget
final SignatureController _controller = SignatureController(
    penStrokeWidth: 5,
    penColor: Colors.red,
    exportBackgroundColor: Colors.blue,
);

// INITIALIZE. RESULT IS A WIDGET, SO IT CAN BE DIRECTLY USED IN BUILD METHOD 
var _signatureCanvas = Signature(
  controller: _controller,
  width: 300,
  height: 300,
  backgroundColor: Colors.lightBlueAccent,
);

// CLEAR CANVAS
_controller.clear();

// EXPORT BYTES AS PNG
// The exported image will be limited to the drawn area
_controller.toPngBytes();

// isEmpty/isNotEmpty CAN BE USED TO CHECK IF SIGNATURE HAS BEEN PROVIDED
_controller.isNotEmpty; //true if signature has been provided
_controller.isEmpty; //true if signature has NOT been provided

// EXPORT POINTS (2D POINTS ROUGHLY REPRESENTING WHAT IS VISIBLE ON CANVAS)
var exportedPoints = _controller.points;

//EXPORTED POINTS CAN BE USED TO INITIALIZE PREVIOUS CONTROLLER
final SignatureController _controller = SignatureController(points: exportedPoints);


Contribution and Support #

  • Contributions are welcome!
  • If you want to contribute code please create a PR
  • If you find a bug or want a feature, please fill an issue
43
likes
90
pub points
97%
popularity

Publisher

4q.eu

A Flutter plugin providing performance optimized signature canvas with ability to set custom style, boundaries and initial state.

Repository (GitHub)
View/report issues

Documentation

API reference

License

MIT (LICENSE)

Dependencies

flutter, image

More

Packages that depend on signature