497 lines
18 KiB
JavaScript
497 lines
18 KiB
JavaScript
|
/*!
|
||
|
|
* Signature Pad v3.0.0-beta.4 | https://github.com/szimek/signature_pad
|
||
|
|
* (c) 2020 Szymon Nowak | Released under the MIT license
|
||
|
|
*/
|
||
|
|
|
||
|
|
class Point {
|
||
|
|
constructor(x, y, time) {
|
||
|
|
this.x = x;
|
||
|
|
this.y = y;
|
||
|
|
this.time = time || Date.now();
|
||
|
|
}
|
||
|
|
distanceTo(start) {
|
||
|
|
return Math.sqrt(Math.pow(this.x - start.x, 2) + Math.pow(this.y - start.y, 2));
|
||
|
|
}
|
||
|
|
equals(other) {
|
||
|
|
return this.x === other.x && this.y === other.y && this.time === other.time;
|
||
|
|
}
|
||
|
|
velocityFrom(start) {
|
||
|
|
return this.time !== start.time
|
||
|
|
? this.distanceTo(start) / (this.time - start.time)
|
||
|
|
: 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
class Bezier {
|
||
|
|
constructor(startPoint, control2, control1, endPoint, startWidth, endWidth) {
|
||
|
|
this.startPoint = startPoint;
|
||
|
|
this.control2 = control2;
|
||
|
|
this.control1 = control1;
|
||
|
|
this.endPoint = endPoint;
|
||
|
|
this.startWidth = startWidth;
|
||
|
|
this.endWidth = endWidth;
|
||
|
|
}
|
||
|
|
static fromPoints(points, widths) {
|
||
|
|
const c2 = this.calculateControlPoints(points[0], points[1], points[2]).c2;
|
||
|
|
const c3 = this.calculateControlPoints(points[1], points[2], points[3]).c1;
|
||
|
|
return new Bezier(points[1], c2, c3, points[2], widths.start, widths.end);
|
||
|
|
}
|
||
|
|
static calculateControlPoints(s1, s2, s3) {
|
||
|
|
const dx1 = s1.x - s2.x;
|
||
|
|
const dy1 = s1.y - s2.y;
|
||
|
|
const dx2 = s2.x - s3.x;
|
||
|
|
const dy2 = s2.y - s3.y;
|
||
|
|
const m1 = { x: (s1.x + s2.x) / 2.0, y: (s1.y + s2.y) / 2.0 };
|
||
|
|
const m2 = { x: (s2.x + s3.x) / 2.0, y: (s2.y + s3.y) / 2.0 };
|
||
|
|
const l1 = Math.sqrt(dx1 * dx1 + dy1 * dy1);
|
||
|
|
const l2 = Math.sqrt(dx2 * dx2 + dy2 * dy2);
|
||
|
|
const dxm = m1.x - m2.x;
|
||
|
|
const dym = m1.y - m2.y;
|
||
|
|
const k = l2 / (l1 + l2);
|
||
|
|
const cm = { x: m2.x + dxm * k, y: m2.y + dym * k };
|
||
|
|
const tx = s2.x - cm.x;
|
||
|
|
const ty = s2.y - cm.y;
|
||
|
|
return {
|
||
|
|
c1: new Point(m1.x + tx, m1.y + ty),
|
||
|
|
c2: new Point(m2.x + tx, m2.y + ty),
|
||
|
|
};
|
||
|
|
}
|
||
|
|
length() {
|
||
|
|
const steps = 10;
|
||
|
|
let length = 0;
|
||
|
|
let px;
|
||
|
|
let py;
|
||
|
|
for (let i = 0; i <= steps; i += 1) {
|
||
|
|
const t = i / steps;
|
||
|
|
const cx = this.point(t, this.startPoint.x, this.control1.x, this.control2.x, this.endPoint.x);
|
||
|
|
const cy = this.point(t, this.startPoint.y, this.control1.y, this.control2.y, this.endPoint.y);
|
||
|
|
if (i > 0) {
|
||
|
|
const xdiff = cx - px;
|
||
|
|
const ydiff = cy - py;
|
||
|
|
length += Math.sqrt(xdiff * xdiff + ydiff * ydiff);
|
||
|
|
}
|
||
|
|
px = cx;
|
||
|
|
py = cy;
|
||
|
|
}
|
||
|
|
return length;
|
||
|
|
}
|
||
|
|
point(t, start, c1, c2, end) {
|
||
|
|
return (start * (1.0 - t) * (1.0 - t) * (1.0 - t))
|
||
|
|
+ (3.0 * c1 * (1.0 - t) * (1.0 - t) * t)
|
||
|
|
+ (3.0 * c2 * (1.0 - t) * t * t)
|
||
|
|
+ (end * t * t * t);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function throttle(fn, wait = 250) {
|
||
|
|
let previous = 0;
|
||
|
|
let timeout = null;
|
||
|
|
let result;
|
||
|
|
let storedContext;
|
||
|
|
let storedArgs;
|
||
|
|
const later = () => {
|
||
|
|
previous = Date.now();
|
||
|
|
timeout = null;
|
||
|
|
result = fn.apply(storedContext, storedArgs);
|
||
|
|
if (!timeout) {
|
||
|
|
storedContext = null;
|
||
|
|
storedArgs = [];
|
||
|
|
}
|
||
|
|
};
|
||
|
|
return function wrapper(...args) {
|
||
|
|
const now = Date.now();
|
||
|
|
const remaining = wait - (now - previous);
|
||
|
|
storedContext = this;
|
||
|
|
storedArgs = args;
|
||
|
|
if (remaining <= 0 || remaining > wait) {
|
||
|
|
if (timeout) {
|
||
|
|
clearTimeout(timeout);
|
||
|
|
timeout = null;
|
||
|
|
}
|
||
|
|
previous = now;
|
||
|
|
result = fn.apply(storedContext, storedArgs);
|
||
|
|
if (!timeout) {
|
||
|
|
storedContext = null;
|
||
|
|
storedArgs = [];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else if (!timeout) {
|
||
|
|
timeout = window.setTimeout(later, remaining);
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
class SignaturePad {
|
||
|
|
constructor(canvas, options = {}) {
|
||
|
|
this.canvas = canvas;
|
||
|
|
this.options = options;
|
||
|
|
this._handleMouseDown = (event) => {
|
||
|
|
if (event.which === 1) {
|
||
|
|
this._mouseButtonDown = true;
|
||
|
|
this._strokeBegin(event);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
this._handleMouseMove = (event) => {
|
||
|
|
if (this._mouseButtonDown) {
|
||
|
|
this._strokeMoveUpdate(event);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
this._handleMouseUp = (event) => {
|
||
|
|
if (event.which === 1 && this._mouseButtonDown) {
|
||
|
|
this._mouseButtonDown = false;
|
||
|
|
this._strokeEnd(event);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
this._handleTouchStart = (event) => {
|
||
|
|
event.preventDefault();
|
||
|
|
if (event.targetTouches.length === 1) {
|
||
|
|
const touch = event.changedTouches[0];
|
||
|
|
this._strokeBegin(touch);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
this._handleTouchMove = (event) => {
|
||
|
|
event.preventDefault();
|
||
|
|
const touch = event.targetTouches[0];
|
||
|
|
this._strokeMoveUpdate(touch);
|
||
|
|
};
|
||
|
|
this._handleTouchEnd = (event) => {
|
||
|
|
const wasCanvasTouched = event.target === this.canvas;
|
||
|
|
if (wasCanvasTouched) {
|
||
|
|
event.preventDefault();
|
||
|
|
const touch = event.changedTouches[0];
|
||
|
|
this._strokeEnd(touch);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
this.velocityFilterWeight = options.velocityFilterWeight || 0.7;
|
||
|
|
this.minWidth = options.minWidth || 0.5;
|
||
|
|
this.maxWidth = options.maxWidth || 2.5;
|
||
|
|
this.throttle = ('throttle' in options ? options.throttle : 16);
|
||
|
|
this.minDistance = ('minDistance' in options
|
||
|
|
? options.minDistance
|
||
|
|
: 5);
|
||
|
|
this.dotSize =
|
||
|
|
options.dotSize ||
|
||
|
|
function dotSize() {
|
||
|
|
return (this.minWidth + this.maxWidth) / 2;
|
||
|
|
};
|
||
|
|
this.penColor = options.penColor || 'black';
|
||
|
|
this.backgroundColor = options.backgroundColor || 'rgba(0,0,0,0)';
|
||
|
|
this.onBegin = options.onBegin;
|
||
|
|
this.onEnd = options.onEnd;
|
||
|
|
this._strokeMoveUpdate = this.throttle
|
||
|
|
? throttle(SignaturePad.prototype._strokeUpdate, this.throttle)
|
||
|
|
: SignaturePad.prototype._strokeUpdate;
|
||
|
|
this._ctx = canvas.getContext('2d');
|
||
|
|
this.clear();
|
||
|
|
this.on();
|
||
|
|
}
|
||
|
|
clear() {
|
||
|
|
const { _ctx: ctx, canvas } = this;
|
||
|
|
ctx.fillStyle = this.backgroundColor;
|
||
|
|
ctx.clearRect(0, 0, canvas.width, canvas.height);
|
||
|
|
ctx.fillRect(0, 0, canvas.width, canvas.height);
|
||
|
|
this._data = [];
|
||
|
|
this._reset();
|
||
|
|
this._isEmpty = true;
|
||
|
|
}
|
||
|
|
fromDataURL(dataUrl, options = {}, callback) {
|
||
|
|
const image = new Image();
|
||
|
|
const ratio = options.ratio || window.devicePixelRatio || 1;
|
||
|
|
const width = options.width || this.canvas.width / ratio;
|
||
|
|
const height = options.height || this.canvas.height / ratio;
|
||
|
|
this._reset();
|
||
|
|
image.onload = () => {
|
||
|
|
this._ctx.drawImage(image, 0, 0, width, height);
|
||
|
|
if (callback) {
|
||
|
|
callback();
|
||
|
|
}
|
||
|
|
};
|
||
|
|
image.onerror = (error) => {
|
||
|
|
if (callback) {
|
||
|
|
callback(error);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
image.src = dataUrl;
|
||
|
|
this._isEmpty = false;
|
||
|
|
}
|
||
|
|
toDataURL(type = 'image/png', encoderOptions) {
|
||
|
|
switch (type) {
|
||
|
|
case 'image/svg+xml':
|
||
|
|
return this._toSVG();
|
||
|
|
default:
|
||
|
|
return this.canvas.toDataURL(type, encoderOptions);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
on() {
|
||
|
|
this.canvas.style.touchAction = 'none';
|
||
|
|
this.canvas.style.msTouchAction = 'none';
|
||
|
|
if (window.PointerEvent) {
|
||
|
|
this._handlePointerEvents();
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
this._handleMouseEvents();
|
||
|
|
if ('ontouchstart' in window) {
|
||
|
|
this._handleTouchEvents();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
off() {
|
||
|
|
this.canvas.style.touchAction = 'auto';
|
||
|
|
this.canvas.style.msTouchAction = 'auto';
|
||
|
|
this.canvas.removeEventListener('pointerdown', this._handleMouseDown);
|
||
|
|
this.canvas.removeEventListener('pointermove', this._handleMouseMove);
|
||
|
|
document.removeEventListener('pointerup', this._handleMouseUp);
|
||
|
|
this.canvas.removeEventListener('mousedown', this._handleMouseDown);
|
||
|
|
this.canvas.removeEventListener('mousemove', this._handleMouseMove);
|
||
|
|
document.removeEventListener('mouseup', this._handleMouseUp);
|
||
|
|
this.canvas.removeEventListener('touchstart', this._handleTouchStart);
|
||
|
|
this.canvas.removeEventListener('touchmove', this._handleTouchMove);
|
||
|
|
this.canvas.removeEventListener('touchend', this._handleTouchEnd);
|
||
|
|
}
|
||
|
|
isEmpty() {
|
||
|
|
return this._isEmpty;
|
||
|
|
}
|
||
|
|
fromData(pointGroups) {
|
||
|
|
this.clear();
|
||
|
|
this._fromData(pointGroups, ({ color, curve }) => this._drawCurve({ color, curve }), ({ color, point }) => this._drawDot({ color, point }));
|
||
|
|
this._data = pointGroups;
|
||
|
|
}
|
||
|
|
toData() {
|
||
|
|
return this._data;
|
||
|
|
}
|
||
|
|
_strokeBegin(event) {
|
||
|
|
const newPointGroup = {
|
||
|
|
color: this.penColor,
|
||
|
|
points: [],
|
||
|
|
};
|
||
|
|
if (typeof this.onBegin === 'function') {
|
||
|
|
this.onBegin(event);
|
||
|
|
}
|
||
|
|
this._data.push(newPointGroup);
|
||
|
|
this._reset();
|
||
|
|
this._strokeUpdate(event);
|
||
|
|
}
|
||
|
|
_strokeUpdate(event) {
|
||
|
|
if (this._data.length === 0) {
|
||
|
|
this._strokeBegin(event);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
const x = event.clientX;
|
||
|
|
const y = event.clientY;
|
||
|
|
const point = this._createPoint(x, y);
|
||
|
|
const lastPointGroup = this._data[this._data.length - 1];
|
||
|
|
const lastPoints = lastPointGroup.points;
|
||
|
|
const lastPoint = lastPoints.length > 0 && lastPoints[lastPoints.length - 1];
|
||
|
|
const isLastPointTooClose = lastPoint
|
||
|
|
? point.distanceTo(lastPoint) <= this.minDistance
|
||
|
|
: false;
|
||
|
|
const color = lastPointGroup.color;
|
||
|
|
if (!lastPoint || !(lastPoint && isLastPointTooClose)) {
|
||
|
|
const curve = this._addPoint(point);
|
||
|
|
if (!lastPoint) {
|
||
|
|
this._drawDot({ color, point });
|
||
|
|
}
|
||
|
|
else if (curve) {
|
||
|
|
this._drawCurve({ color, curve });
|
||
|
|
}
|
||
|
|
lastPoints.push({
|
||
|
|
time: point.time,
|
||
|
|
x: point.x,
|
||
|
|
y: point.y,
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
_strokeEnd(event) {
|
||
|
|
this._strokeUpdate(event);
|
||
|
|
if (typeof this.onEnd === 'function') {
|
||
|
|
this.onEnd(event);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
_handlePointerEvents() {
|
||
|
|
this._mouseButtonDown = false;
|
||
|
|
this.canvas.addEventListener('pointerdown', this._handleMouseDown);
|
||
|
|
this.canvas.addEventListener('pointermove', this._handleMouseMove);
|
||
|
|
document.addEventListener('pointerup', this._handleMouseUp);
|
||
|
|
}
|
||
|
|
_handleMouseEvents() {
|
||
|
|
this._mouseButtonDown = false;
|
||
|
|
this.canvas.addEventListener('mousedown', this._handleMouseDown);
|
||
|
|
this.canvas.addEventListener('mousemove', this._handleMouseMove);
|
||
|
|
document.addEventListener('mouseup', this._handleMouseUp);
|
||
|
|
}
|
||
|
|
_handleTouchEvents() {
|
||
|
|
this.canvas.addEventListener('touchstart', this._handleTouchStart);
|
||
|
|
this.canvas.addEventListener('touchmove', this._handleTouchMove);
|
||
|
|
this.canvas.addEventListener('touchend', this._handleTouchEnd);
|
||
|
|
}
|
||
|
|
_reset() {
|
||
|
|
this._lastPoints = [];
|
||
|
|
this._lastVelocity = 0;
|
||
|
|
this._lastWidth = (this.minWidth + this.maxWidth) / 2;
|
||
|
|
this._ctx.fillStyle = this.penColor;
|
||
|
|
}
|
||
|
|
_createPoint(x, y) {
|
||
|
|
const rect = this.canvas.getBoundingClientRect();
|
||
|
|
return new Point(x - rect.left, y - rect.top, new Date().getTime());
|
||
|
|
}
|
||
|
|
_addPoint(point) {
|
||
|
|
const { _lastPoints } = this;
|
||
|
|
_lastPoints.push(point);
|
||
|
|
if (_lastPoints.length > 2) {
|
||
|
|
if (_lastPoints.length === 3) {
|
||
|
|
_lastPoints.unshift(_lastPoints[0]);
|
||
|
|
}
|
||
|
|
const widths = this._calculateCurveWidths(_lastPoints[1], _lastPoints[2]);
|
||
|
|
const curve = Bezier.fromPoints(_lastPoints, widths);
|
||
|
|
_lastPoints.shift();
|
||
|
|
return curve;
|
||
|
|
}
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
_calculateCurveWidths(startPoint, endPoint) {
|
||
|
|
const velocity = this.velocityFilterWeight * endPoint.velocityFrom(startPoint) +
|
||
|
|
(1 - this.velocityFilterWeight) * this._lastVelocity;
|
||
|
|
const newWidth = this._strokeWidth(velocity);
|
||
|
|
const widths = {
|
||
|
|
end: newWidth,
|
||
|
|
start: this._lastWidth,
|
||
|
|
};
|
||
|
|
this._lastVelocity = velocity;
|
||
|
|
this._lastWidth = newWidth;
|
||
|
|
return widths;
|
||
|
|
}
|
||
|
|
_strokeWidth(velocity) {
|
||
|
|
return Math.max(this.maxWidth / (velocity + 1), this.minWidth);
|
||
|
|
}
|
||
|
|
_drawCurveSegment(x, y, width) {
|
||
|
|
const ctx = this._ctx;
|
||
|
|
ctx.moveTo(x, y);
|
||
|
|
ctx.arc(x, y, width, 0, 2 * Math.PI, false);
|
||
|
|
this._isEmpty = false;
|
||
|
|
}
|
||
|
|
_drawCurve({ color, curve }) {
|
||
|
|
const ctx = this._ctx;
|
||
|
|
const widthDelta = curve.endWidth - curve.startWidth;
|
||
|
|
const drawSteps = Math.floor(curve.length()) * 2;
|
||
|
|
ctx.beginPath();
|
||
|
|
ctx.fillStyle = color;
|
||
|
|
for (let i = 0; i < drawSteps; i += 1) {
|
||
|
|
const t = i / drawSteps;
|
||
|
|
const tt = t * t;
|
||
|
|
const ttt = tt * t;
|
||
|
|
const u = 1 - t;
|
||
|
|
const uu = u * u;
|
||
|
|
const uuu = uu * u;
|
||
|
|
let x = uuu * curve.startPoint.x;
|
||
|
|
x += 3 * uu * t * curve.control1.x;
|
||
|
|
x += 3 * u * tt * curve.control2.x;
|
||
|
|
x += ttt * curve.endPoint.x;
|
||
|
|
let y = uuu * curve.startPoint.y;
|
||
|
|
y += 3 * uu * t * curve.control1.y;
|
||
|
|
y += 3 * u * tt * curve.control2.y;
|
||
|
|
y += ttt * curve.endPoint.y;
|
||
|
|
const width = Math.min(curve.startWidth + ttt * widthDelta, this.maxWidth);
|
||
|
|
this._drawCurveSegment(x, y, width);
|
||
|
|
}
|
||
|
|
ctx.closePath();
|
||
|
|
ctx.fill();
|
||
|
|
}
|
||
|
|
_drawDot({ color, point, }) {
|
||
|
|
const ctx = this._ctx;
|
||
|
|
const width = typeof this.dotSize === 'function' ? this.dotSize() : this.dotSize;
|
||
|
|
ctx.beginPath();
|
||
|
|
this._drawCurveSegment(point.x, point.y, width);
|
||
|
|
ctx.closePath();
|
||
|
|
ctx.fillStyle = color;
|
||
|
|
ctx.fill();
|
||
|
|
}
|
||
|
|
_fromData(pointGroups, drawCurve, drawDot) {
|
||
|
|
for (const group of pointGroups) {
|
||
|
|
const { color, points } = group;
|
||
|
|
if (points.length > 1) {
|
||
|
|
for (let j = 0; j < points.length; j += 1) {
|
||
|
|
const basicPoint = points[j];
|
||
|
|
const point = new Point(basicPoint.x, basicPoint.y, basicPoint.time);
|
||
|
|
this.penColor = color;
|
||
|
|
if (j === 0) {
|
||
|
|
this._reset();
|
||
|
|
}
|
||
|
|
const curve = this._addPoint(point);
|
||
|
|
if (curve) {
|
||
|
|
drawCurve({ color, curve });
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
this._reset();
|
||
|
|
drawDot({
|
||
|
|
color,
|
||
|
|
point: points[0],
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
_toSVG() {
|
||
|
|
const pointGroups = this._data;
|
||
|
|
const ratio = Math.max(window.devicePixelRatio || 1, 1);
|
||
|
|
const minX = 0;
|
||
|
|
const minY = 0;
|
||
|
|
const maxX = this.canvas.width / ratio;
|
||
|
|
const maxY = this.canvas.height / ratio;
|
||
|
|
const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
|
||
|
|
svg.setAttribute('width', this.canvas.width.toString());
|
||
|
|
svg.setAttribute('height', this.canvas.height.toString());
|
||
|
|
this._fromData(pointGroups, ({ color, curve }) => {
|
||
|
|
const path = document.createElement('path');
|
||
|
|
if (!isNaN(curve.control1.x) &&
|
||
|
|
!isNaN(curve.control1.y) &&
|
||
|
|
!isNaN(curve.control2.x) &&
|
||
|
|
!isNaN(curve.control2.y)) {
|
||
|
|
const attr = `M ${curve.startPoint.x.toFixed(3)},${curve.startPoint.y.toFixed(3)} ` +
|
||
|
|
`C ${curve.control1.x.toFixed(3)},${curve.control1.y.toFixed(3)} ` +
|
||
|
|
`${curve.control2.x.toFixed(3)},${curve.control2.y.toFixed(3)} ` +
|
||
|
|
`${curve.endPoint.x.toFixed(3)},${curve.endPoint.y.toFixed(3)}`;
|
||
|
|
path.setAttribute('d', attr);
|
||
|
|
path.setAttribute('stroke-width', (curve.endWidth * 2.25).toFixed(3));
|
||
|
|
path.setAttribute('stroke', color);
|
||
|
|
path.setAttribute('fill', 'none');
|
||
|
|
path.setAttribute('stroke-linecap', 'round');
|
||
|
|
svg.appendChild(path);
|
||
|
|
}
|
||
|
|
}, ({ color, point }) => {
|
||
|
|
const circle = document.createElement('circle');
|
||
|
|
const dotSize = typeof this.dotSize === 'function' ? this.dotSize() : this.dotSize;
|
||
|
|
circle.setAttribute('r', dotSize.toString());
|
||
|
|
circle.setAttribute('cx', point.x.toString());
|
||
|
|
circle.setAttribute('cy', point.y.toString());
|
||
|
|
circle.setAttribute('fill', color);
|
||
|
|
svg.appendChild(circle);
|
||
|
|
});
|
||
|
|
const prefix = 'data:image/svg+xml;base64,';
|
||
|
|
const header = '<svg' +
|
||
|
|
' xmlns="http://www.w3.org/2000/svg"' +
|
||
|
|
' xmlns:xlink="http://www.w3.org/1999/xlink"' +
|
||
|
|
` viewBox="${minX} ${minY} ${maxX} ${maxY}"` +
|
||
|
|
` width="${maxX}"` +
|
||
|
|
` height="${maxY}"` +
|
||
|
|
'>';
|
||
|
|
let body = svg.innerHTML;
|
||
|
|
if (body === undefined) {
|
||
|
|
const dummy = document.createElement('dummy');
|
||
|
|
const nodes = svg.childNodes;
|
||
|
|
dummy.innerHTML = '';
|
||
|
|
for (let i = 0; i < nodes.length; i += 1) {
|
||
|
|
dummy.appendChild(nodes[i].cloneNode(true));
|
||
|
|
}
|
||
|
|
body = dummy.innerHTML;
|
||
|
|
}
|
||
|
|
const footer = '</svg>';
|
||
|
|
const data = header + body + footer;
|
||
|
|
return prefix + btoa(data);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
export default SignaturePad;
|
||
|
|
//# sourceMappingURL=signature_pad.js.map
|