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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';

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

// CLEAR CANVAS
_signatureCanvas.clear();

// EXPORT BYTES (EXPORTING FORMAT IS PNG)
_signatureCanvas.exportBytes();

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

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

//EXPORTED POINTS CAN BE USED TO INITIALIZE PREVIOUS STATE VIA CONSTRUCTOR
var _signatureCanvas = Signature(
  points: exportedPoints,
  width: 300,
  height: 300,
  backgroundColor: Colors.lightBlueAccent,
);

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
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likes
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Publisher

verified publisher4q.eu

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

Repository (GitHub)
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License

MIT (LICENSE)

Dependencies

flutter

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