react-signature
A signature board component for react.
Quick Start
npm install @uiw/react-signature
import React, { useRef } from "react";
import Signature from '@uiw/react-signature';
export default function App() {
const $svg = useRef(null);
const handle = (evn) => {
const parentElement = $svg.current
while (parentElement.firstChild) {
parentElement.removeChild(parentElement.firstChild);
}
}
return (
<>
<Signature ref={$svg} />
<button onClick={handle}>Clear</button>
</>
);
}
Readonly
import React, { useRef, useEffect } from "react";
import Signature, { getStroke, getSvgPathFromStroke, defaultOptions } from '@uiw/react-signature';
const point1 = [[81.546875,38.87890625],[82.34375,37.55078125],[84.27734375,35.2265625],[87.73046875,33.2421875],[94.98046875,30.87890625],[106.29296875,28.6796875],[118.23828125,27.71875],[126.6953125,29.45703125],[134.9375,36.22265625],[141.8359375,47.13671875],[143.9765625,59.53515625],[141.8671875,76],[128.1484375,98.9609375],[106.203125,118.87109375],[95.04296875,125.8203125],[94.5859375,125.04296875],[94.7265625,122.04296875],[97.90234375,115.30859375],[109.28515625,102.3046875],[129.75390625,86.796875],[155.27734375,76.14453125],[184.99609375,71.8828125],[218.16015625,73.33984375],[249.26953125,77.8671875],[264.2421875,81.10546875],[266.51171875,82.35546875],[267.69921875,82.99609375],[267.64453125,83.08203125],[267.73046875,82.6875],[267.73828125,80.4921875],[267.83203125,75.4765625],[268.36328125,66.6484375],[268.84765625,56.4609375],[268.421875,46.88671875],[266.9296875,40.86328125],[264.90625,38.4765625],[262.87890625,37.30859375],[258.68359375,39.13671875],[251.265625,43.80078125],[242.21484375,51.79296875],[232.60546875,63.21484375],[222.6484375,78.53125],[213.01171875,94.58984375],[206.3203125,104.57421875],[201.64453125,109.59375],[198.61328125,111.87109375],[197.24609375,111.3671875],[195.421875,109.23828125],[193.87890625,104.91015625],[193.7265625,99.140625],[198.671875,89.87109375],[214.1015625,75.14453125],[243.25390625,54.8671875],[290.3671875,29.3515625],[329.31640625,10.6875],[338.9609375,6.70703125],[338.5234375,9.07421875],[336.8671875,15.4453125],[331.4296875,28.4140625],[323.234375,43.5234375],[312.70703125,57.9609375],[302.296875,66.97265625],[293.85546875,70.734375],[287.6484375,72.25],[283.45703125,70.9453125],[280.51171875,68.09375],[279.5390625,64.13671875],[280.828125,60.0234375],[284.98828125,56.40625],[294.63671875,54.62109375],[307.8984375,56.17578125],[316.7890625,62.65234375],[317.5859375,74.11328125],[309.1640625,92.50390625],[295.12109375,110.55859375],[282.93359375,123.125],[278.58203125,129.00390625],[279.46875,129.80859375],[285.25390625,129.26953125],[299.71484375,125.71875],[321.41015625,118.89453125],[349.296875,108.58203125],[372.53125,98.8671875],[387.57421875,91],[395.23046875,84.53125],[396.7421875,79.3046875],[395.31640625,75.45703125],[389.86328125,73.57421875],[374.875,77.3203125],[347.36328125,88.46875],[310.44140625,107.75],[273.14453125,130.30078125],[252.08984375,145.77734375],[246.2890625,152.421875],[245.4609375,153.8046875],[245.3671875,153.1640625],[245.78515625,148.46875],[247.5859375,136.29296875],[250.55078125,119.38671875],[253.1796875,107.87890625],[255.4765625,102.29296875],[257.40625,99.61328125],[260.58203125,99.8125],[273.9453125,105.66015625],[296.24609375,118.10546875],[326.40234375,138.03125],[355.63671875,158.3515625],[368.66796875,167.1796875],[373.015625,170.12109375],[374.7578125,170.8203125],[374.73046875,169.78125],[374.6953125,167.3203125],[374.765625,161.75],[375.6328125,154.09375],[377.94921875,146.08984375],[380.94921875,140.23046875],[383.6640625,136.3046875],[385.0546875,134.08203125],[385.19140625,133.45703125],[384.81640625,132.41015625]];
const point2 = [[335.0078125,77.8828125],[335.31640625,77.984375],[336.16796875,78.30078125],[337.640625,79.0546875],[339.65234375,80.44140625],[342.88671875,82.921875],[347.0625,86.28125],[353.9296875,91.546875],[358.88671875,95.125],[359.7734375,95.6875],[360.48828125,96.19921875],[360.2265625,96.42578125]];
export default function App() {
const stroke = getStroke(point1, defaultOptions);
const pathData = getSvgPathFromStroke(stroke);
const pathData2 = getSvgPathFromStroke(getStroke(point2, defaultOptions));
return (
<Signature readonly fill="#6b85e4">
<path d={pathData} />
<path d={pathData2} />
</Signature>
);
}
Background Color & Text color
Background transparency can be set with --w-signature-background: transparent;
import React, { useRef } from "react";
import Signature from '@uiw/react-signature';
export default function App() {
const $svg = useRef(null);
const handle = (evn) => {
const parentElement = $svg.current
while (parentElement.firstChild) {
parentElement.removeChild(parentElement.firstChild);
}
}
return (
<>
<Signature ref={$svg} fill="red" style={{ "--w-signature-background": "#e4e6ef" }} />
<button onClick={() => handle()}>Clear</button>
</>
);
}
Props
import React from 'react';
import { type StrokeOptions } from 'perfect-freehand';
export interface SignatureProps extends React.SVGProps<SVGSVGElement> {
prefixCls?: string;
options?: StrokeOptions;
readonly?: boolean;
onPointer?: (points: number[][]) => void;
}
export default function Signature(props?: SignatureProps): React.JSX.Element;
utils
import { type StrokeOptions } from 'perfect-freehand';
/\*\*
\* Turn the points returned from perfect-freehand into SVG path data.
\*/
export declare function getSvgPathFromStroke(stroke: number[][]): string;
export declare const defaultOptions: StrokeOptions;
export declare const getBoundingClientRect: (el: SVGSVGElement | null) => {
offsetX: number;
offsetY: number;
};
export declare const getClinetXY: ({ clientX, clientY }: PointerEvent) => {
clientX: number;
clientY: number;
};
export declare const defaultStyle: React.CSSProperties;
Options
The options object is optional, as are each of its properties.
| Property | Type | Default | Description |
|---|---|---|---|
size |
number | 8 | The base size (diameter) of the stroke. |
thinning |
number | .5 | The effect of pressure on the stroke’s size. |
smoothing |
number | .5 | How much to soften the stroke’s edges. |
streamline |
number | .5 | How much to streamline the stroke. |
simulatePressure |
boolean | true | Whether to simulate pressure based on velocity. |
easing |
function | t => t | An easing function to apply to each point’s pressure. |
start |
{ } | Tapering options for the start of the line. | |
end |
{ } | Tapering options for the end of the line. | |
last |
boolean | false | Whether the stroke is complete. |
Note: When the last property is true, the line’s end will be drawn at the last input point, rather than slightly behind it.
The start and end options accept an object:
| Property | Type | Default | Description |
|---|---|---|---|
cap |
boolean | true | Whether to draw a cap. |
taper |
number or boolean | 0 | The distance to taper. If set to true, the taper will be the total length of the stroke. |
easing |
function | t => t | An easing function for the tapering effect. |
Note: The cap property has no effect when taper is more than zero.
<Signature
options={{
size: 6,
smoothing: 0.46,
thinning: 0.73,
streamline: 0.5,
easing: (t) => t,
simulatePressure: true,
last: true,
start: {
cap: true,
taper: 0,
easing: (t) => t,
},
end: {
cap: true,
taper: 0,
easing: (t) => t,
},
}}
/>
Tip: To create a stroke with a steady line, set the
thinningoption to0.Tip: To create a stroke that gets thinner with pressure instead of thicker, use a negative number for the
thinningoption.
Development
- Dependencies in the installation package and example
npm run install
- To develop, run the self-reloading build:
npm run build # Compile packages 📦 @uiw/react-signature
npm run watch # Real-time compilation 📦 @uiw/react-signature
- Run Document Website Environment:
npm run start
- To contribute, please fork repos, add your patch and tests for it (in the
test/folder) and submit a pull request.
npm run test
Contributors
As always, thanks to our amazing contributors!
Made with contributors.
License
Licensed under the MIT License.
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