text: /*!
   * Signature Pad v3.0.0-beta.4 | https://github.com/szimek/signature_pad
   * (c) 2021 Szymon Nowak | Released under the MIT license
   */
  
  (function (global, factory) {
      typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
      typeof define === 'function' && define.amd ? define(factory) :
      (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.SignaturePad = factory());
  }(this, (function () { 'use strict';
  
      var Point = (function () {
          function Point(x, y, time) {
              this.x = x;
              this.y = y;
              this.time = time || Date.now();
          }
          Point.prototype.distanceTo = function (start) {
              return Math.sqrt(Math.pow(this.x - start.x, 2) + Math.pow(this.y - start.y, 2));
          };
          Point.prototype.equals = function (other) {
              return this.x === other.x && this.y === other.y && this.time === other.time;
          };
          Point.prototype.velocityFrom = function (start) {
              return this.time !== start.time
                  ? this.distanceTo(start) / (this.time - start.time)
                  : 0;
          };
          return Point;
      }());
  
      var Bezier = (function () {
          function Bezier(startPoint, control2, control1, endPoint, startWidth, endWidth) {
              this.startPoint = startPoint;
              this.control2 = control2;
              this.control1 = control1;
              this.endPoint = endPoint;
              this.startWidth = startWidth;
              this.endWidth = endWidth;
          }
          Bezier.fromPoints = function (points, widths) {
              var c2 = this.calculateControlPoints(points[0], points[1], points[2]).c2;
              var c3 = this.calculateControlPoints(points[1], points[2], points[3]).c1;
              return new Bezier(points[1], c2, c3, points[2], widths.start, widths.end);
          };
          Bezier.calculateControlPoints = function (s1, s2, s3) {
              var dx1 = s1.x - s2.x;
              var dy1 = s1.y - s2.y;
              var dx2 = s2.x - s3.x;
              var dy2 = s2.y - s3.y;
              var m1 = { x: (s1.x + s2.x) / 2.0, y: (s1.y + s2.y) / 2.0 };
              var m2 = { x: (s2.x + s3.x) / 2.0, y: (s2.y + s3.y) / 2.0 };
              var l1 = Math.sqrt(dx1 * dx1 + dy1 * dy1);
              var l2 = Math.sqrt(dx2 * dx2 + dy2 * dy2);
              var dxm = m1.x - m2.x;
              var dym = m1.y - m2.y;
              var k = l2 / (l1 + l2);
              var cm = { x: m2.x + dxm * k, y: m2.y + dym * k };
              var tx = s2.x - cm.x;
              var ty = s2.y - cm.y;
              return {
                  c1: new Point(m1.x + tx, m1.y + ty),
                  c2: new Point(m2.x + tx, m2.y + ty)
              };
          };
          Bezier.prototype.length = function () {
              var steps = 10;
              var length = 0;
              var px;
              var py;
              for (var i = 0; i <= steps; i += 1) {
                  var t = i / steps;
                  var cx = this.point(t, this.startPoint.x, this.control1.x, this.control2.x, this.endPoint.x);
                  var cy = this.point(t, this.startPoint.y, this.control1.y, this.control2.y, this.endPoint.y);
                  if (i > 0) {
                      var xdiff = cx - px;
                      var ydiff = cy - py;
                      length += Math.sqrt(xdiff * xdiff + ydiff * ydiff);
                  }
                  px = cx;
                  py = cy;
              }
              return length;
          };
          Bezier.prototype.point = function (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);
          };
          return Bezier;
      }());
  
      function throttle(fn, wait) {
          if (wait === void 0) { wait = 250; }
          var previous = 0;
          var timeout = null;
          var result;
          var storedContext;
          var storedArgs;
          var later = function () {
              previous = Date.now();
              timeout = null;
              result = fn.apply(storedContext, storedArgs);
              if (!timeout) {
                  storedContext = null;
                  storedArgs = [];
              }
          };
          return function wrapper() {
              var args = [];
              for (var _i = 0; _i < arguments.length; _i++) {
                  args[_i] = arguments[_i];
              }
              var now = Date.now();
              var 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;
          };
      }
  
      var SignaturePad = (function () {
          function SignaturePad(canvas, options) {
              var _this = this;
              if (options === void 0) { options = {}; }
              this.canvas = canvas;
              this.options = options;
              this._handleMouseDown = function (event) {
                  if (event.which === 1) {
                      _this._mouseButtonDown = true;
                      _this._strokeBegin(event);
                  }
              };
              this._handleMouseMove = function (event) {
                  if (_this._mouseButtonDown) {
                      _this._strokeMoveUpdate(event);
                  }
              };
              this._handleMouseUp = function (event) {
                  if (event.which === 1 && _this._mouseButtonDown) {
                      _this._mouseButtonDown = false;
                      _this._strokeEnd(event);
                  }
              };
              this._handleTouchStart = function (event) {
                  event.preventDefault();
                  if (event.targetTouches.length === 1) {
                      var touch = event.changedTouches[0];
                      _this._strokeBegin(touch);
                  }
              };
              this._handleTouchMove = function (event) {
                  event.preventDefault();
                  var touch = event.targetTouches[0];
                  _this._strokeMoveUpdate(touch);
              };
              this._handleTouchEnd = function (event) {
                  var wasCanvasTouched = event.target === _this.canvas;
                  if (wasCanvasTouched) {
                      event.preventDefault();
                      var 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();
          }
          SignaturePad.prototype.clear = function () {
              var _a = this, ctx = _a._ctx, canvas = _a.canvas;
              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;
          };
          SignaturePad.prototype.fromDataURL = function (dataUrl, options, callback) {
              var _this = this;
              if (options === void 0) { options = {}; }
              var image = new Image();
              var ratio = options.ratio || window.devicePixelRatio || 1;
              var width = options.width || this.canvas.width / ratio;
              var height = options.height || this.canvas.height / ratio;
              this._reset();
              image.onload = function () {
                  _this._ctx.drawImage(image, 0, 0, width, height);
                  if (callback) {
                      callback();
                  }
              };
              image.onerror = function (error) {
                  if (callback) {
                      callback(error);
                  }
              };
              image.src = dataUrl;
              this._isEmpty = false;
          };
          SignaturePad.prototype.toDataURL = function (type, encoderOptions) {
              if (type === void 0) { type = 'image/png'; }
              switch (type) {
                  case 'image/svg+xml':
                      return this._toSVG();
                  default:
                      return this.canvas.toDataURL(type, encoderOptions);
              }
          };
          SignaturePad.prototype.on = function () {
              this.canvas.style.touchAction = 'none';
              this.canvas.style.msTouchAction = 'none';
              if (window.PointerEvent) {
                  this._handlePointerEvents();
              }
              else {
                  this._handleMouseEvents();
                  if ('ontouchstart' in window) {
                      this._handleTouchEvents();
                  }
              }
          };
          SignaturePad.prototype.off = function () {
              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);
          };
          SignaturePad.prototype.isEmpty = function () {
              return this._isEmpty;
          };
          SignaturePad.prototype.fromData = function (pointGroups) {
              var _this = this;
              this.clear();
              this._fromData(pointGroups, function (_a) {
                  var color = _a.color, curve = _a.curve;
                  return _this._drawCurve({ color: color, curve: curve });
              }, function (_a) {
                  var color = _a.color, point = _a.point;
                  return _this._drawDot({ color: color, point: point });
              });
              this._data = pointGroups;
          };
          SignaturePad.prototype.toData = function () {
              return this._data;
          };
          SignaturePad.prototype._strokeBegin = function (event) {
              var newPointGroup = {
                  color: this.penColor,
                  points: []
              };
              if (typeof this.onBegin === 'function') {
                  this.onBegin(event);
              }
              this._data.push(newPointGroup);
              this._reset();
              this._strokeUpdate(event);
          };
          SignaturePad.prototype._strokeUpdate = function (event) {
              if (this._data.length === 0) {
                  this._strokeBegin(event);
                  return;
              }
              var x = event.clientX;
              var y = event.clientY;
              var point = this._createPoint(x, y);
              var lastPointGroup = this._data[this._data.length - 1];
              var lastPoints = lastPointGroup.points;
              var lastPoint = lastPoints.length > 0 && lastPoints[lastPoints.length - 1];
              var isLastPointTooClose = lastPoint
                  ? point.distanceTo(lastPoint) <= this.minDistance
                  : false;
              var color = lastPointGroup.color;
              if (!lastPoint || !(lastPoint && isLastPointTooClose)) {
                  var curve = this._addPoint(point);
                  if (!lastPoint) {
                      this._drawDot({ color: color, point: point });
                  }
                  else if (curve) {
                      this._drawCurve({ color: color, curve: curve });
                  }
                  lastPoints.push({
                      time: point.time,
                      x: point.x,
                      y: point.y
                  });
              }
          };
          SignaturePad.prototype._strokeEnd = function (event) {
              this._strokeUpdate(event);
              if (typeof this.onEnd === 'function') {
                  this.onEnd(event);
              }
          };
          SignaturePad.prototype._handlePointerEvents = function () {
              this._mouseButtonDown = false;
              this.canvas.addEventListener('pointerdown', this._handleMouseDown);
              this.canvas.addEventListener('pointermove', this._handleMouseMove);
              document.addEventListener('pointerup', this._handleMouseUp);
          };
          SignaturePad.prototype._handleMouseEvents = function () {
              this._mouseButtonDown = false;
              this.canvas.addEventListener('mousedown', this._handleMouseDown);
              this.canvas.addEventListener('mousemove', this._handleMouseMove);
              document.addEventListener('mouseup', this._handleMouseUp);
          };
          SignaturePad.prototype._handleTouchEvents = function () {
              this.canvas.addEventListener('touchstart', this._handleTouchStart);
              this.canvas.addEventListener('touchmove', this._handleTouchMove);
              this.canvas.addEventListener('touchend', this._handleTouchEnd);
          };
          SignaturePad.prototype._reset = function () {
              this._lastPoints = [];
              this._lastVelocity = 0;
              this._lastWidth = (this.minWidth + this.maxWidth) / 2;
              this._ctx.fillStyle = this.penColor;
          };
          SignaturePad.prototype._createPoint = function (x, y) {
              var rect = this.canvas.getBoundingClientRect();
              return new Point(x - rect.left, y - rect.top, new Date().getTime());
          };
          SignaturePad.prototype._addPoint = function (point) {
              var _lastPoints = this._lastPoints;
              _lastPoints.push(point);
              if (_lastPoints.length > 2) {
                  if (_lastPoints.length === 3) {
                      _lastPoints.unshift(_lastPoints[0]);
                  }
                  var widths = this._calculateCurveWidths(_lastPoints[1], _lastPoints[2]);
                  var curve = Bezier.fromPoints(_lastPoints, widths);
                  _lastPoints.shift();
                  return curve;
              }
              return null;
          };
          SignaturePad.prototype._calculateCurveWidths = function (startPoint, endPoint) {
              var velocity = this.velocityFilterWeight * endPoint.velocityFrom(startPoint) +
                  (1 - this.velocityFilterWeight) * this._lastVelocity;
              var newWidth = this._strokeWidth(velocity);
              var widths = {
                  end: newWidth,
                  start: this._lastWidth
              };
              this._lastVelocity = velocity;
              this._lastWidth = newWidth;
              return widths;
          };
          SignaturePad.prototype._strokeWidth = function (velocity) {
              return Math.max(this.maxWidth / (velocity + 1), this.minWidth);
          };
          SignaturePad.prototype._drawCurveSegment = function (x, y, width) {
              var ctx = this._ctx;
              ctx.moveTo(x, y);
              ctx.arc(x, y, width, 0, 2 * Math.PI, false);
              this._isEmpty = false;
          };
          SignaturePad.prototype._drawCurve = function (_a) {
              var color = _a.color, curve = _a.curve;
              var ctx = this._ctx;
              var widthDelta = curve.endWidth - curve.startWidth;
              var drawSteps = Math.floor(curve.length()) * 2;
              ctx.beginPath();
              ctx.fillStyle = color;
              for (var i = 0; i < drawSteps; i += 1) {
                  var t = i / drawSteps;
                  var tt = t * t;
                  var ttt = tt * t;
                  var u = 1 - t;
                  var uu = u * u;
                  var uuu = uu * u;
                  var x = uuu * curve.startPoint.x;
                  x += 3 * uu * t * curve.control1.x;
                  x += 3 * u * tt * curve.control2.x;
                  x += ttt * curve.endPoint.x;
                  var y = uuu * curve.startPoint.y;
                  y += 3 * uu * t * curve.control1.y;
                  y += 3 * u * tt * curve.control2.y;
                  y += ttt * curve.endPoint.y;
                  var width = Math.min(curve.startWidth + ttt * widthDelta, this.maxWidth);
                  this._drawCurveSegment(x, y, width);
              }
              ctx.closePath();
              ctx.fill();
          };
          SignaturePad.prototype._drawDot = function (_a) {
              var color = _a.color, point = _a.point;
              var ctx = this._ctx;
              var 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();
          };
          SignaturePad.prototype._fromData = function (pointGroups, drawCurve, drawDot) {
              for (var _i = 0, pointGroups_1 = pointGroups; _i < pointGroups_1.length; _i++) {
                  var group = pointGroups_1[_i];
                  var color = group.color, points = group.points;
                  if (points.length > 1) {
                      for (var j = 0; j < points.length; j += 1) {
                          var basicPoint = points[j];
                          var point = new Point(basicPoint.x, basicPoint.y, basicPoint.time);
                          this.penColor = color;
                          if (j === 0) {
                              this._reset();
                          }
                          var curve = this._addPoint(point);
                          if (curve) {
                              drawCurve({ color: color, curve: curve });
                          }
                      }
                  }
                  else {
                      this._reset();
                      drawDot({
                          color: color,
                          point: points[0]
                      });
                  }
              }
          };
          SignaturePad.prototype._toSVG = function () {
              var _this = this;
              var pointGroups = this._data;
              var ratio = Math.max(window.devicePixelRatio || 1, 1);
              var minX = 0;
              var minY = 0;
              var maxX = this.canvas.width / ratio;
              var maxY = this.canvas.height / ratio;
              var 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, function (_a) {
                  var color = _a.color, curve = _a.curve;
                  var path = document.createElement('path');
                  if (!isNaN(curve.control1.x) &&
                      !isNaN(curve.control1.y) &&
                      !isNaN(curve.control2.x) &&
                      !isNaN(curve.control2.y)) {
                      var 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);
                  }
              }, function (_a) {
                  var color = _a.color, point = _a.point;
                  var circle = document.createElement('circle');
                  var 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);
              });
              var prefix = 'data:image/svg+xml;base64,';
              var 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 + "\"") +
                  '>';
              var body = svg.innerHTML;
              if (body === undefined) {
                  var dummy = document.createElement('dummy');
                  var nodes = svg.childNodes;
                  dummy.innerHTML = '';
                  for (var i = 0; i < nodes.length; i += 1) {
                      dummy.appendChild(nodes[i].cloneNode(true));
                  }
                  body = dummy.innerHTML;
              }
              var footer = '</svg>';
              var data = header + body + footer;
              return prefix + btoa(data);
          };
          SignaturePad.prototype._colorToHex = function (color) {
              var ctx = document
                  .createElement('canvas')
                  .getContext('2d');
              ctx.fillStyle = color;
              return ctx.fillStyle;
          };
          SignaturePad.prototype.toSkiaPath = function () {
              var _this = this;
              var pointGroups = this._data;
              var skiaPath = '';
              this._fromData(pointGroups, function (_a) {
                  var color = _a.color, curve = _a.curve;
                  if (!isNaN(curve.control1.x) &&
                      !isNaN(curve.control1.y) &&
                      !isNaN(curve.control2.x) &&
                      !isNaN(curve.control2.y)) {
                      skiaPath +=
                          (color.includes('#') ? color : _this._colorToHex(color)) + ";" +
                              ("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) + ";");
                  }
              }, function () {
              });
              return skiaPath;
          };
          SignaturePad.prototype.fromSkiaPath = function (skiaPath) {
              var ratio = Math.max(window.devicePixelRatio || 1, 1);
              var minX = 0;
              var minY = 0;
              var maxX = this.canvas.width / ratio;
              var maxY = this.canvas.height / ratio;
              var svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
              var skiaPointGroups = skiaPath
                  .split(';')
                  .reduce(function (pathGroups, segment, index) {
                  if (segment.trim().length > 0) {
                      pathGroups += segment.trim();
                      pathGroups += index % 2 == 0 ? '&' : '%';
                  }
                  return pathGroups;
              }, '')
                  .split('%')
                  .map(function (pathGroup) {
                  if (pathGroup.length === 0) {
                      return { color: 'n/a', path: 'n/a' };
                  }
                  var pathGroupArray = pathGroup.split('&');
                  return {
                      color: pathGroupArray[0],
                      path: pathGroupArray[1]
                  };
              })
                  .filter(function (i) { return i.path !== 'n/a'; });
              for (var _i = 0, skiaPointGroups_1 = skiaPointGroups; _i < skiaPointGroups_1.length; _i++) {
                  var skiaPointGroup = skiaPointGroups_1[_i];
                  var startCoords = skiaPointGroup.path
                      .split(' C ')[0]
                      .substring(1)
                      .trim()
                      .split(',')
                      .map(function (i) { return parseFloat(i); });
                  var startPoint = new Point(startCoords[0], startCoords[1]);
                  var endCoords = skiaPointGroup.path
                      .split(' C ')[1]
                      .split(' ')
                      .pop()
                      .split(',')
                      .map(function (i) { return parseFloat(i); });
                  var endPoint = new Point(endCoords[0], endCoords[1]);
                  var curveWidths = this._calculateCurveWidths(startPoint, endPoint);
                  var path = document.createElement('path');
                  path.setAttribute('d', skiaPointGroup.path);
                  path.setAttribute('stroke-width', (curveWidths.end).toFixed(3));
                  path.setAttribute('stroke', skiaPointGroup.color);
                  path.setAttribute('fill', 'none');
                  path.setAttribute('stroke-linecap', 'round');
                  svg.appendChild(path);
              }
              var prefix = 'data:image/svg+xml;base64,';
              var 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 + "\"") +
                  '>';
              var body = svg.innerHTML;
              if (body === undefined) {
                  var dummy = document.createElement('dummy');
                  var nodes = svg.childNodes;
                  dummy.innerHTML = '';
                  for (var i = 0; i < nodes.length; i += 1) {
                      dummy.appendChild(nodes[i].cloneNode(true));
                  }
                  body = dummy.innerHTML;
              }
              var footer = '</svg>';
              var data = header + body + footer;
              var base64Svg = prefix + btoa(data);
              this.fromDataURL(base64Svg);
          };
          return SignaturePad;
      }());
  
      return SignaturePad;
  
  })));
  //# sourceMappingURL=signature_pad.umd.js.map
  