text: /*!
   * Modified
   * Signature Pad v1.5.3
   * https://github.com/szimek/signature_pad
   *
   * Copyright 2016 Szymon Nowak
   * Released under the MIT license
   */
  var SignaturePad = (function(document) {
      "use strict";
  
      var log = console.log.bind(console);
  
      var SignaturePad = function(canvas, options) {
          var self = this,
              opts = options || {};
  
          this.velocityFilterWeight = opts.velocityFilterWeight || 0.7;
          this.minWidth = opts.minWidth || 0.5;
          this.maxWidth = opts.maxWidth || 2.5;
          this.dotSize = opts.dotSize || function() {
                  return (self.minWidth + self.maxWidth) / 2;
              };
          this.penColor = opts.penColor || "black";
          this.backgroundColor = opts.backgroundColor || "rgba(0,0,0,0)";
          this.throttle = opts.throttle || 0;
          this.throttleOptions = {
              leading: true,
              trailing: true
          };
          this.minPointDistance = opts.minPointDistance || 0;
          this.onEnd = opts.onEnd;
          this.onBegin = opts.onBegin;
  
          this._canvas = canvas;
          this._ctx = canvas.getContext("2d");
          this._ctx.lineCap = 'round';
          this.clear();
  
          // we need add these inline so they are available to unbind while still having
          //  access to 'self' we could use _.bind but it's not worth adding a dependency
          this._handleMouseDown = function(event) {
              if (event.which === 1) {
                  self._mouseButtonDown = true;
                  self._strokeBegin(event);
              }
          };
  
          var _handleMouseMove = function(event) {
             event.preventDefault();
              if (self._mouseButtonDown) {
                  self._strokeUpdate(event);
                  if (self.arePointsDisplayed) {
                      var point = self._createPoint(event);
                      self._drawMark(point.x, point.y, 5);
                  }
              }
          };
  
          this._handleMouseMove = _.throttle(_handleMouseMove, self.throttle, self.throttleOptions);
          //this._handleMouseMove = _handleMouseMove;
  
          this._handleMouseUp = function(event) {
              if (event.which === 1 && self._mouseButtonDown) {
                  self._mouseButtonDown = false;
                  self._strokeEnd(event);
              }
          };
  
          this._handleTouchStart = function(event) {
              if (event.targetTouches.length == 1) {
                  var touch = event.changedTouches[0];
                  self._strokeBegin(touch);
              }
          };
  
          var _handleTouchMove = function(event) {
              // Prevent scrolling.
              event.preventDefault();
  
              var touch = event.targetTouches[0];
              self._strokeUpdate(touch);
              if (self.arePointsDisplayed) {
                  var point = self._createPoint(touch);
                  self._drawMark(point.x, point.y, 5);
              }
          };
          this._handleTouchMove = _.throttle(_handleTouchMove, self.throttle, self.throttleOptions);
          //this._handleTouchMove = _handleTouchMove;
  
          this._handleTouchEnd = function(event) {
              var wasCanvasTouched = event.target === self._canvas;
              if (wasCanvasTouched) {
                  event.preventDefault();
                  self._strokeEnd(event);
              }
          };
  
          this._handleMouseEvents();
          this._handleTouchEvents();
      };
  
      SignaturePad.prototype.clear = function() {
          var ctx = this._ctx,
              canvas = this._canvas;
  
          ctx.fillStyle = this.backgroundColor;
          ctx.clearRect(0, 0, canvas.width, canvas.height);
          ctx.fillRect(0, 0, canvas.width, canvas.height);
          this._reset();
      };
  
      SignaturePad.prototype.showPointsToggle = function() {
          this.arePointsDisplayed = !this.arePointsDisplayed;
      };
  
      SignaturePad.prototype.toDataURL = function(imageType, quality) {
          var canvas = this._canvas;
          return canvas.toDataURL.apply(canvas, arguments);
      };
  
      SignaturePad.prototype.fromDataURL = function(dataUrl) {
          var self = this,
              image = new Image(),
              ratio = window.devicePixelRatio || 1,
              width = this._canvas.width / ratio,
              height = this._canvas.height / ratio;
  
          this._reset();
          image.src = dataUrl;
          image.onload = function() {
              self._ctx.drawImage(image, 0, 0, width, height);
          };
          this._isEmpty = false;
      };
  
      SignaturePad.prototype._strokeUpdate = function(event) {
          var point = this._createPoint(event);
          if(this._isPointToBeUsed(point)){
              this._addPoint(point);
          }
      };
  
      var pointsSkippedFromBeingAdded = 0;
      SignaturePad.prototype._isPointToBeUsed = function(point) {
          // Simplifying, De-noise
          if(!this.minPointDistance)
              return true;
  
          var points = this.points;
          if(points && points.length){
              var lastPoint = points[points.length-1];
              if(point.distanceTo(lastPoint) < this.minPointDistance){
                  // log(++pointsSkippedFromBeingAdded);
                  return false;
              }
          }
          return true;
      };
  
      SignaturePad.prototype._strokeBegin = function(event) {
          this._reset();
          this._strokeUpdate(event);
          if (typeof this.onBegin === 'function') {
              this.onBegin(event);
          }
      };
  
      SignaturePad.prototype._strokeDraw = function(point) {
          var ctx = this._ctx,
              dotSize = typeof(this.dotSize) === 'function' ? this.dotSize() : this.dotSize;
  
          ctx.beginPath();
          this._drawPoint(point.x, point.y, dotSize);
          ctx.closePath();
          ctx.fill();
      };
  
      SignaturePad.prototype._strokeEnd = function(event) {
          var canDrawCurve = this.points.length > 2,
              point = this.points[0];
  
          if (!canDrawCurve && point) {
              this._strokeDraw(point);
          }
          if (typeof this.onEnd === 'function') {
              this.onEnd(event);
          }
      };
  
      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() {
          // Pass touch events to canvas element on mobile IE11 and Edge.
          this._canvas.style.msTouchAction = 'none';
          this._canvas.style.touchAction = 'none';
  
          this._canvas.addEventListener("touchstart", this._handleTouchStart);
          this._canvas.addEventListener("touchmove", this._handleTouchMove);
          this._canvas.addEventListener("touchend", this._handleTouchEnd);
      };
  
      SignaturePad.prototype.on = function() {
          this._handleMouseEvents();
          this._handleTouchEvents();
      };
  
      SignaturePad.prototype.off = function() {
          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._reset = function() {
          this.points = [];
          this._lastVelocity = 0;
          this._lastWidth = (this.minWidth + this.maxWidth) / 2;
          this._isEmpty = true;
          this._ctx.fillStyle = this.penColor;
      };
  
      SignaturePad.prototype._createPoint = function(event) {
          var rect = this._canvas.getBoundingClientRect();
          return new Point(
              event.clientX - rect.left,
              event.clientY - rect.top
          );
      };
  
      SignaturePad.prototype._addPoint = function(point) {
          var points = this.points,
              c2, c3,
              curve, tmp;
  
          points.push(point);
  
          if (points.length > 2) {
              // To reduce the initial lag make it work with 3 points
              // by copying the first point to the beginning.
              if (points.length === 3) points.unshift(points[0]);
  
              tmp = this._calculateCurveControlPoints(points[0], points[1], points[2]);
              c2 = tmp.c2;
              tmp = this._calculateCurveControlPoints(points[1], points[2], points[3]);
              c3 = tmp.c1;
              curve = new Bezier(points[1], c2, c3, points[2]);
              this._addCurve(curve);
  
              // Remove the first element from the list,
              // so that we always have no more than 4 points in points array.
              points.shift();
          }
      };
  
      SignaturePad.prototype._calculateCurveControlPoints = function(s1, s2, s3) {
          var dx1 = s1.x - s2.x,
              dy1 = s1.y - s2.y,
              dx2 = s2.x - s3.x,
              dy2 = s2.y - s3.y,
  
              m1 = {
                  x: (s1.x + s2.x) / 2.0,
                  y: (s1.y + s2.y) / 2.0
              },
              m2 = {
                  x: (s2.x + s3.x) / 2.0,
                  y: (s2.y + s3.y) / 2.0
              },
  
              l1 = Math.sqrt(1.0 * dx1 * dx1 + dy1 * dy1),
              l2 = Math.sqrt(1.0 * dx2 * dx2 + dy2 * dy2),
  
              dxm = (m1.x - m2.x),
              dym = (m1.y - m2.y),
  
              k = l2 / (l1 + l2),
              cm = {
                  x: m2.x + dxm * k,
                  y: m2.y + dym * k
              },
  
              tx = s2.x - cm.x,
              ty = s2.y - cm.y;
  
          return {
              c1: new Point(m1.x + tx, m1.y + ty),
              c2: new Point(m2.x + tx, m2.y + ty)
          };
      };
  
      SignaturePad.prototype._addCurve = function(curve) {
          var startPoint = curve.startPoint,
              endPoint = curve.endPoint,
              velocity, newWidth;
  
          velocity = endPoint.velocityFrom(startPoint);
          velocity = this.velocityFilterWeight * velocity +
              (1 - this.velocityFilterWeight) * this._lastVelocity;
  
          newWidth = this._strokeWidth(velocity);
          this._drawCurve(curve, this._lastWidth, newWidth);
  
          this._lastVelocity = velocity;
          this._lastWidth = newWidth;
      };
  
      SignaturePad.prototype._drawPoint = function(x, y, size) {
          var ctx = this._ctx;
  
          ctx.moveTo(x, y);
          ctx.arc(x, y, size, 0, 2 * Math.PI, false);
          this._isEmpty = false;
      };
  
      SignaturePad.prototype._drawMark = function(x, y, size) {
          var ctx = this._ctx;
  
          ctx.save();
          ctx.moveTo(x, y);
          ctx.arc(x, y, size, 0, 2 * Math.PI, false);
          ctx.fillStyle = 'rgba(255, 0, 0, 0.2)';
          ctx.fill();
          ctx.restore();
      };
  
      SignaturePad.prototype._drawCurve = function(curve, startWidth, endWidth) {
          var ctx = this._ctx,
              widthDelta = endWidth - startWidth,
              drawSteps, width, i, t, tt, ttt, u, uu, uuu, x, y;
  
          drawSteps = Math.floor(curve.length());
          ctx.beginPath();
          for (i = 0; i < drawSteps; i++) {
              // Calculate the Bezier (x, y) coordinate for this step.
              t = i / drawSteps;
              tt = t * t;
              ttt = tt * t;
              u = 1 - t;
              uu = u * u;
              uuu = uu * u;
  
              x = uuu * curve.startPoint.x;
              x += 3 * uu * t * curve.control1.x;
              x += 3 * u * tt * curve.control2.x;
              x += ttt * curve.endPoint.x;
  
              y = uuu * curve.startPoint.y;
              y += 3 * uu * t * curve.control1.y;
              y += 3 * u * tt * curve.control2.y;
              y += ttt * curve.endPoint.y;
  
              width = startWidth + ttt * widthDelta;
              this._drawPoint(x, y, width);
          }
          ctx.closePath();
          ctx.fill();
      };
  
      SignaturePad.prototype._strokeWidth = function(velocity) {
          return Math.max(this.maxWidth / (velocity + 1), this.minWidth);
      };
  
      var Point = function(x, y, time) {
          this.x = x;
          this.y = y;
          this.time = time || new Date().getTime();
      };
  
      Point.prototype.velocityFrom = function(start) {
          return (this.time !== start.time) ? this.distanceTo(start) / (this.time - start.time) : 1;
      };
  
      Point.prototype.distanceTo = function(start) {
          return Math.sqrt(Math.pow(this.x - start.x, 2) + Math.pow(this.y - start.y, 2));
      };
  
      var Bezier = function(startPoint, control1, control2, endPoint) {
          this.startPoint = startPoint;
          this.control1 = control1;
          this.control2 = control2;
          this.endPoint = endPoint;
      };
  
      // Returns approximated length.
      Bezier.prototype.length = function() {
          var steps = 10,
              length = 0,
              i, t, cx, cy, px, py, xdiff, ydiff;
  
          for (i = 0; i <= steps; i++) {
              t = i / steps;
              cx = this._point(t, this.startPoint.x, this.control1.x, this.control2.x, this.endPoint.x);
              cy = this._point(t, this.startPoint.y, this.control1.y, this.control2.y, this.endPoint.y);
              if (i > 0) {
                  xdiff = cx - px;
                  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 SignaturePad;
  })(document);
  
  var signaturePad = new SignaturePad(document.getElementById('signature-pad'), {
      backgroundColor: 'rgba(255, 255, 255, 0)',
      penColor: 'rgb(0, 0, 0)',
      velocityFilterWeight: .7,
      minWidth: 0.5,
      maxWidth: 2.5,
      throttle: 16, // max x milli seconds on event update, OBS! this introduces lag for event update
      minPointDistance: 3,
  });
  var saveButton = document.getElementById('save'),
      clearButton = document.getElementById('clear'),
      showPointsToggle = document.getElementById('showPointsToggle');
  
  
  clearButton.addEventListener('click', function(event) {
      signaturePad.clear();
  });
  