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/*!
* 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