hand_signature 0.5.1

The signature pad widget that allows to draw signature with finger.

A Flutter plugin providing signature pad for drawing smooth signatures. Library is written in pure Dart/Flutter environment to provide support for all platforms..
Easy to use library with variety of draw and export settings.

Signature pad drawing is based on Cubic Bézier curves.

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Usage

    import 'package:hand_signature/signature.dart';

With HandSignatureControl and HandSignaturePainterView is possible to tweak some aspects of signature like stroke width, smoothing ratio or velocity weight.

    final control = HandSignatureControl(
      threshold: 3.0,
      smoothRatio: 0.65,
      velocityRange: 2.0,
    );

    final widget = HandSignaturePainterView(
      control: control,
      color: Colors.blueGrey,
      width: 1.0,
      maxWidth: 10.0,
    );

Export
Some properties can be modified during export, like canvas size, stroke min/max width and color. There are more ways and more formats how to export signature. Most used are svg and png formats.

    final control = HandSignatureControl();

    final svg = control.toSvg();
    final png = control.toImage();

Parsing
Resulting svg is possible to display in classic flutter_svg widget.
Or use build in HandSignatureView for greater control.

    final widget = HandSignatureView.svg(
      data: svgString,
      strokeWidth: (width) => width * 0.35,
    );

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Contribution
Any contribution is highly welcomed.
Library is in good condition, but still in early development.
Mainly to improve smoothing and line weight to better match real signature.
And there are some performance problems with high amount of drawing lines.
Also currently there are no tests or documentation.