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393 lines
15 KiB
393 lines
15 KiB
/*!
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* Signature Pad v3.0.0-beta.3 | https://github.com/szimek/signature_pad
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* (c) 2018 Szymon Nowak | Released under the MIT license
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*/
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
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typeof define === 'function' && define.amd ? define(factory) :
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(global.SignaturePad = factory());
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}(this, (function () { 'use strict';
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var Point = (function () {
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function Point(x, y, time) {
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this.x = x;
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this.y = y;
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this.time = time || Date.now();
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}
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Point.prototype.distanceTo = function (start) {
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return Math.sqrt(Math.pow(this.x - start.x, 2) + Math.pow(this.y - start.y, 2));
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};
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Point.prototype.equals = function (other) {
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return this.x === other.x && this.y === other.y && this.time === other.time;
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};
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Point.prototype.velocityFrom = function (start) {
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return (this.time !== start.time) ? this.distanceTo(start) / (this.time - start.time) : 0;
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};
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return Point;
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}());
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var Bezier = (function () {
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function Bezier(startPoint, control2, control1, endPoint, startWidth, endWidth) {
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this.startPoint = startPoint;
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this.control2 = control2;
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this.control1 = control1;
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this.endPoint = endPoint;
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this.startWidth = startWidth;
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this.endWidth = endWidth;
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}
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Bezier.fromPoints = function (points, widths) {
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var c2 = this.calculateControlPoints(points[0], points[1], points[2]).c2;
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var c3 = this.calculateControlPoints(points[1], points[2], points[3]).c1;
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return new Bezier(points[1], c2, c3, points[2], widths.start, widths.end);
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};
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Bezier.calculateControlPoints = function (s1, s2, s3) {
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var dx1 = s1.x - s2.x;
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var dy1 = s1.y - s2.y;
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var dx2 = s2.x - s3.x;
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var dy2 = s2.y - s3.y;
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var m1 = { x: (s1.x + s2.x) / 2.0, y: (s1.y + s2.y) / 2.0 };
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var m2 = { x: (s2.x + s3.x) / 2.0, y: (s2.y + s3.y) / 2.0 };
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var l1 = Math.sqrt((dx1 * dx1) + (dy1 * dy1));
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var l2 = Math.sqrt((dx2 * dx2) + (dy2 * dy2));
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var dxm = (m1.x - m2.x);
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var dym = (m1.y - m2.y);
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var k = l2 / (l1 + l2);
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var cm = { x: m2.x + (dxm * k), y: m2.y + (dym * k) };
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var tx = s2.x - cm.x;
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var ty = s2.y - cm.y;
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return {
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c1: new Point(m1.x + tx, m1.y + ty),
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c2: new Point(m2.x + tx, m2.y + ty)
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};
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};
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Bezier.prototype.length = function () {
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var steps = 10;
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var length = 0;
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var px;
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var py;
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for (var i = 0; i <= steps; i += 1) {
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var t = i / steps;
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var cx = this.point(t, this.startPoint.x, this.control1.x, this.control2.x, this.endPoint.x);
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var cy = this.point(t, this.startPoint.y, this.control1.y, this.control2.y, this.endPoint.y);
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if (i > 0) {
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var xdiff = cx - px;
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var ydiff = cy - py;
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length += Math.sqrt((xdiff * xdiff) + (ydiff * ydiff));
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}
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px = cx;
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py = cy;
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}
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return length;
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};
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Bezier.prototype.point = function (t, start, c1, c2, end) {
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return (start * (1.0 - t) * (1.0 - t) * (1.0 - t))
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+ (3.0 * c1 * (1.0 - t) * (1.0 - t) * t)
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+ (3.0 * c2 * (1.0 - t) * t * t)
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+ (end * t * t * t);
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};
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return Bezier;
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}());
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function throttle(fn, wait) {
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if (wait === void 0) { wait = 250; }
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var previous = 0;
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var timeout = null;
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var result;
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var storedContext;
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var storedArgs;
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var later = function () {
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previous = Date.now();
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timeout = null;
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result = fn.apply(storedContext, storedArgs);
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if (!timeout) {
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storedContext = null;
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storedArgs = [];
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}
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};
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return function () {
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var args = [];
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for (var _i = 0; _i < arguments.length; _i++) {
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args[_i] = arguments[_i];
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}
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var now = Date.now();
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var remaining = wait - (now - previous);
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storedContext = this;
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storedArgs = args;
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if (remaining <= 0 || remaining > wait) {
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if (timeout) {
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clearTimeout(timeout);
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timeout = null;
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}
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previous = now;
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result = fn.apply(storedContext, storedArgs);
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if (!timeout) {
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storedContext = null;
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storedArgs = [];
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}
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}
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else if (!timeout) {
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timeout = setTimeout(later, remaining);
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}
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return result;
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};
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}
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var SignaturePad = (function () {
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function SignaturePad(canvas, options) {
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if (options === void 0) { options = {}; }
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var _this = this;
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this.canvas = canvas;
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this.options = options;
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this._handleTouchStart = function (event) {
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if (event.touches.length === 1) {
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var touch = event.changedTouches[0];
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_this._strokeBegin(touch);
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}
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};
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this._handleTouchMove = function (event) {
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var touch = event.touches[0];
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_this._strokeMoveUpdate(touch);
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};
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this._handleTouchEnd = function (event) {
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var wasCanvasTouched = event.target === _this.canvas;
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if (wasCanvasTouched) {
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event.preventDefault();
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var touch = event.changedTouches[0];
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_this._strokeEnd(touch);
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}
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};
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this.velocityFilterWeight = options.velocityFilterWeight || 0.7;
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this.minWidth = options.minWidth || 0.5;
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this.maxWidth = options.maxWidth || 2.5;
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this.throttle = ('throttle' in options ? options.throttle : 16);
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this.minDistance = ('minDistance' in options ? options.minDistance : 5);
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if (this.throttle) {
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this._strokeMoveUpdate = throttle(SignaturePad.prototype._strokeUpdate, this.throttle);
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}
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else {
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this._strokeMoveUpdate = SignaturePad.prototype._strokeUpdate;
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}
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this.dotSize = options.dotSize || function () {
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return (this.minWidth + this.maxWidth) / 2;
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};
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this.penColor = options.penColor || 'black';
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this.backgroundColor = options.backgroundColor || 'rgba(0,0,0,0)';
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this.onBegin = options.onBegin;
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this.onEnd = options.onEnd;
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this._ctx = canvas.getContext('2d');
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this.clear();
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}
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SignaturePad.prototype.clear = function () {
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var ctx = this._ctx;
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var canvas = this.canvas;
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ctx.fillStyle = this.backgroundColor;
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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this._data = [];
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this._reset();
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this._isEmpty = true;
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};
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SignaturePad.prototype.fromDataURL = function (dataUrl, options, callback) {
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var _this = this;
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if (options === void 0) { options = {}; }
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var image = new Image();
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var ratio = options.ratio || 1;
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var width = options.width || (this.canvas.width / ratio);
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var height = options.height || (this.canvas.height / ratio);
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this._reset();
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image.onload = function () {
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_this._ctx.drawImage(image, 0, 0, width, height);
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if (callback) {
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callback();
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}
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};
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image.onerror = function (error) {
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if (callback) {
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callback(error);
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}
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};
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image.src = dataUrl;
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this._isEmpty = false;
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};
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SignaturePad.prototype.toDataURL = function (type, encoderOptions) {
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if (type === void 0) { type = 'image/png'; }
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return this.canvas.toDataURL(type, encoderOptions);
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};
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SignaturePad.prototype.isEmpty = function () {
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return this._isEmpty;
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};
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SignaturePad.prototype.fromData = function (pointGroups) {
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var _this = this;
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this.clear();
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this._fromData(pointGroups, function (_a) {
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var color = _a.color, curve = _a.curve;
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return _this._drawCurve({ color: color, curve: curve });
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}, function (_a) {
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var color = _a.color, point = _a.point;
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return _this._drawDot({ color: color, point: point });
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});
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this._data = pointGroups;
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};
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SignaturePad.prototype.toData = function () {
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return this._data;
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};
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SignaturePad.prototype._strokeBegin = function (event) {
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var newPointGroup = {
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color: this.penColor,
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points: []
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};
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this._data.push(newPointGroup);
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this._reset();
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this._strokeUpdate(event);
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if (typeof this.onBegin === 'function') {
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this.onBegin(event);
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}
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};
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SignaturePad.prototype._strokeUpdate = function (event) {
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var x = event.x;
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var y = event.y;
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var point = this._createPoint(x, y);
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var lastPointGroup = this._data[this._data.length - 1];
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var lastPoints = lastPointGroup.points;
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var lastPoint = lastPoints.length > 0 && lastPoints[lastPoints.length - 1];
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var isLastPointTooClose = lastPoint ? point.distanceTo(lastPoint) <= this.minDistance : false;
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var color = lastPointGroup.color;
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if (!lastPoint || !(lastPoint && isLastPointTooClose)) {
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var curve = this._addPoint(point);
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if (!lastPoint) {
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this._drawDot({ color: color, point: point });
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}
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else if (curve) {
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this._drawCurve({ color: color, curve: curve });
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}
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lastPoints.push({
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time: point.time,
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x: point.x,
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y: point.y
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});
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}
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};
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SignaturePad.prototype._strokeEnd = function (event) {
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this._strokeUpdate(event);
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if (typeof this.onEnd === 'function') {
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this.onEnd(event);
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}
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};
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SignaturePad.prototype._reset = function () {
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this._lastPoints = [];
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this._lastVelocity = 0;
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this._lastWidth = (this.minWidth + this.maxWidth) / 2;
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this._ctx.fillStyle = this.penColor;
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};
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SignaturePad.prototype._createPoint = function (x, y) {
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return new Point(x, y, new Date().getTime());
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};
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SignaturePad.prototype._addPoint = function (point) {
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var _lastPoints = this._lastPoints;
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_lastPoints.push(point);
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if (_lastPoints.length > 2) {
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if (_lastPoints.length === 3) {
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_lastPoints.unshift(_lastPoints[0]);
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}
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var widths = this._calculateCurveWidths(_lastPoints[1], _lastPoints[2]);
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var curve = Bezier.fromPoints(_lastPoints, widths);
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_lastPoints.shift();
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return curve;
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}
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return null;
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};
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SignaturePad.prototype._calculateCurveWidths = function (startPoint, endPoint) {
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var velocity = (this.velocityFilterWeight * endPoint.velocityFrom(startPoint))
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+ ((1 - this.velocityFilterWeight) * this._lastVelocity);
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var newWidth = this._strokeWidth(velocity);
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var widths = {
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end: newWidth,
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start: this._lastWidth
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};
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this._lastVelocity = velocity;
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this._lastWidth = newWidth;
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return widths;
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};
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SignaturePad.prototype._strokeWidth = function (velocity) {
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return Math.max(this.maxWidth / (velocity + 1), this.minWidth);
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};
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SignaturePad.prototype._drawCurveSegment = function (x, y, width) {
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var ctx = this._ctx;
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ctx.moveTo(x, y);
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ctx.arc(x, y, width, 0, 2 * Math.PI, false);
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this._isEmpty = false;
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};
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SignaturePad.prototype._drawCurve = function (_a) {
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var color = _a.color, curve = _a.curve;
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var ctx = this._ctx;
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var widthDelta = curve.endWidth - curve.startWidth;
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var drawSteps = Math.floor(curve.length()) * 2;
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ctx.beginPath();
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ctx.fillStyle = color;
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for (var i = 0; i < drawSteps; i += 1) {
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var t = i / drawSteps;
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var tt = t * t;
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var ttt = tt * t;
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var u = 1 - t;
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var uu = u * u;
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var uuu = uu * u;
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var x = uuu * curve.startPoint.x;
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x += 3 * uu * t * curve.control1.x;
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x += 3 * u * tt * curve.control2.x;
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x += ttt * curve.endPoint.x;
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var y = uuu * curve.startPoint.y;
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y += 3 * uu * t * curve.control1.y;
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y += 3 * u * tt * curve.control2.y;
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y += ttt * curve.endPoint.y;
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var width = curve.startWidth + (ttt * widthDelta);
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this._drawCurveSegment(x, y, width);
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}
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ctx.closePath();
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ctx.fill();
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};
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SignaturePad.prototype._drawDot = function (_a) {
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var color = _a.color, point = _a.point;
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var ctx = this._ctx;
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var width = 1;
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ctx.beginPath();
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this._drawCurveSegment(point.x, point.y, width);
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ctx.closePath();
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ctx.fillStyle = color;
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ctx.fill();
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};
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SignaturePad.prototype._fromData = function (pointGroups, drawCurve, drawDot) {
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for (var _i = 0, pointGroups_1 = pointGroups; _i < pointGroups_1.length; _i++) {
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var group = pointGroups_1[_i];
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var color = group.color, points = group.points;
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if (points.length > 1) {
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for (var j = 0; j < points.length; j += 1) {
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var basicPoint = points[j];
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var point = new Point(basicPoint.x, basicPoint.y, basicPoint.time);
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this.penColor = color;
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if (j === 0) {
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this._reset();
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}
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var curve = this._addPoint(point);
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if (curve) {
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drawCurve({ color: color, curve: curve });
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}
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}
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}
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else {
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this._reset();
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drawDot({
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color: color,
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point: points[0]
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});
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}
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}
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};
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return SignaturePad;
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}());
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return SignaturePad;
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})));
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