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public/high/plugins/signature_pad/src/bezier.js

@@ -0,0 +1,52 @@
+function Bezier(startPoint, control1, control2, endPoint) {
+  this.startPoint = startPoint;
+  this.control1 = control1;
+  this.control2 = control2;
+  this.endPoint = endPoint;
+}
+
+// Returns approximated length.
+Bezier.prototype.length = function () {
+  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;
+};
+
+/* eslint-disable no-multi-spaces, space-in-parens */
+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);
+};
+/* eslint-enable no-multi-spaces, space-in-parens */
+
+export default Bezier;

public/high/plugins/signature_pad/src/point.js

@@ -0,0 +1,19 @@
+function Point(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));
+};
+
+Point.prototype.equals = function (other) {
+  return this.x === other.x && this.y === other.y && this.time === other.time;
+};
+
+export default Point;

public/high/plugins/signature_pad/src/signature_pad.js

@@ -0,0 +1,509 @@
+import Point from './point';
+import Bezier from './bezier';
+import throttle from './throttle';
+
+function SignaturePad(canvas, options) {
+  const self = this;
+  const opts = options || {};
+
+  this.velocityFilterWeight = opts.velocityFilterWeight || 0.7;
+  this.minWidth = opts.minWidth || 0.5;
+  this.maxWidth = opts.maxWidth || 2.5;
+  this.throttle = 'throttle' in opts ? opts.throttle : 16; // in miliseconds
+  this.minDistance = 'minDistance' in opts ? opts.minDistance : 5;
+
+  if (this.throttle) {
+    this._strokeMoveUpdate = throttle(SignaturePad.prototype._strokeUpdate, this.throttle);
+  } else {
+    this._strokeMoveUpdate = SignaturePad.prototype._strokeUpdate;
+  }
+
+  this.dotSize = opts.dotSize || function () {
+    return (this.minWidth + this.maxWidth) / 2;
+  };
+  this.penColor = opts.penColor || 'black';
+  this.backgroundColor = opts.backgroundColor || 'rgba(0,0,0,0)';
+  this.onBegin = opts.onBegin;
+  this.onEnd = opts.onEnd;
+
+  this._canvas = canvas;
+  this._ctx = canvas.getContext('2d');
+  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);
+    }
+  };
+
+  this._handleMouseMove = function (event) {
+    if (self._mouseButtonDown) {
+      self._strokeMoveUpdate(event);
+    }
+  };
+
+  this._handleMouseUp = function (event) {
+    if (event.which === 1 && self._mouseButtonDown) {
+      self._mouseButtonDown = false;
+      self._strokeEnd(event);
+    }
+  };
+
+  this._handleTouchStart = function (event) {
+    // Prevent scrolling.
+    event.preventDefault();
+
+    if (event.targetTouches.length === 1) {
+      const touch = event.changedTouches[0];
+      self._strokeBegin(touch);
+    }
+  };
+
+  this._handleTouchMove = function (event) {
+    // Prevent scrolling.
+    event.preventDefault();
+
+    const touch = event.targetTouches[0];
+    self._strokeMoveUpdate(touch);
+  };
+
+  this._handleTouchEnd = function (event) {
+    const wasCanvasTouched = event.target === self._canvas;
+    if (wasCanvasTouched) {
+      event.preventDefault();
+      self._strokeEnd(event);
+    }
+  };
+
+  // Enable mouse and touch event handlers
+  this.on();
+}
+
+// Public methods
+SignaturePad.prototype.clear = function () {
+  const ctx = this._ctx;
+  const canvas = this._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 = {}) {
+  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.src = dataUrl;
+  image.onload = () => {
+    this._ctx.drawImage(image, 0, 0, width, height);
+  };
+  this._isEmpty = false;
+};
+
+SignaturePad.prototype.toDataURL = function (type, ...options) {
+  switch (type) {
+    case 'image/svg+xml':
+      return this._toSVG();
+    default:
+      return this._canvas.toDataURL(type, ...options);
+  }
+};
+
+SignaturePad.prototype.on = function () {
+  this._handleMouseEvents();
+  this._handleTouchEvents();
+};
+
+SignaturePad.prototype.off = function () {
+  // Pass touch events to canvas element on mobile IE11 and Edge.
+  this._canvas.style.msTouchAction = 'auto';
+  this._canvas.style.touchAction = 'auto';
+
+  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;
+};
+
+// Private methods
+SignaturePad.prototype._strokeBegin = function (event) {
+  this._data.push([]);
+  this._reset();
+  this._strokeUpdate(event);
+
+  if (typeof this.onBegin === 'function') {
+    this.onBegin(event);
+  }
+};
+
+SignaturePad.prototype._strokeUpdate = function (event) {
+  const x = event.clientX;
+  const y = event.clientY;
+
+  const point = this._createPoint(x, y);
+  const lastPointGroup = this._data[this._data.length - 1];
+  const lastPoint = lastPointGroup && lastPointGroup[lastPointGroup.length - 1];
+  const isLastPointTooClose = lastPoint && point.distanceTo(lastPoint) < this.minDistance;
+
+  // Skip this point if it's too close to the previous one
+  if (!(lastPoint && isLastPointTooClose)) {
+    const { curve, widths } = this._addPoint(point);
+
+    if (curve && widths) {
+      this._drawCurve(curve, widths.start, widths.end);
+    }
+
+    this._data[this._data.length - 1].push({
+      x: point.x,
+      y: point.y,
+      time: point.time,
+      color: this.penColor,
+    });
+  }
+};
+
+SignaturePad.prototype._strokeEnd = function (event) {
+  const canDrawCurve = this.points.length > 2;
+  const point = this.points[0]; // Point instance
+
+  if (!canDrawCurve && point) {
+    this._drawDot(point);
+  }
+
+  if (point) {
+    const lastPointGroup = this._data[this._data.length - 1];
+    const lastPoint = lastPointGroup[lastPointGroup.length - 1]; // plain object
+
+    // When drawing a dot, there's only one point in a group, so without this check
+    // such group would end up with exactly the same 2 points.
+    if (!point.equals(lastPoint)) {
+      lastPointGroup.push({
+        x: point.x,
+        y: point.y,
+        time: point.time,
+        color: this.penColor,
+      });
+    }
+  }
+
+  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._reset = function () {
+  this.points = [];
+  this._lastVelocity = 0;
+  this._lastWidth = (this.minWidth + this.maxWidth) / 2;
+  this._ctx.fillStyle = this.penColor;
+};
+
+SignaturePad.prototype._createPoint = function (x, y, time) {
+  const rect = this._canvas.getBoundingClientRect();
+
+  return new Point(
+    x - rect.left,
+    y - rect.top,
+    time || new Date().getTime(),
+  );
+};
+
+SignaturePad.prototype._addPoint = function (point) {
+  const points = this.points;
+  let 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]);
+    const c2 = tmp.c2;
+    tmp = this._calculateCurveControlPoints(points[1], points[2], points[3]);
+    const c3 = tmp.c1;
+    const curve = new Bezier(points[1], c2, c3, points[2]);
+    const widths = this._calculateCurveWidths(curve);
+
+    // Remove the first element from the list,
+    // so that we always have no more than 4 points in points array.
+    points.shift();
+
+    return { curve, widths };
+  }
+
+  return {};
+};
+
+SignaturePad.prototype._calculateCurveControlPoints = function (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),
+  };
+};
+
+SignaturePad.prototype._calculateCurveWidths = function (curve) {
+  const startPoint = curve.startPoint;
+  const endPoint = curve.endPoint;
+  const widths = { start: null, end: null };
+
+  const velocity = (this.velocityFilterWeight * endPoint.velocityFrom(startPoint))
+   + ((1 - this.velocityFilterWeight) * this._lastVelocity);
+
+  const newWidth = this._strokeWidth(velocity);
+
+  widths.start = this._lastWidth;
+  widths.end = newWidth;
+
+  this._lastVelocity = velocity;
+  this._lastWidth = newWidth;
+
+  return widths;
+};
+
+SignaturePad.prototype._strokeWidth = function (velocity) {
+  return Math.max(this.maxWidth / (velocity + 1), this.minWidth);
+};
+
+SignaturePad.prototype._drawPoint = function (x, y, size) {
+  const ctx = this._ctx;
+
+  ctx.moveTo(x, y);
+  ctx.arc(x, y, size, 0, 2 * Math.PI, false);
+  this._isEmpty = false;
+};
+
+SignaturePad.prototype._drawCurve = function (curve, startWidth, endWidth) {
+  const ctx = this._ctx;
+  const widthDelta = endWidth - startWidth;
+  const drawSteps = Math.floor(curve.length());
+
+  ctx.beginPath();
+
+  for (let i = 0; i < drawSteps; i += 1) {
+    // Calculate the Bezier (x, y) coordinate for this step.
+    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 = startWidth + (ttt * widthDelta);
+    this._drawPoint(x, y, width);
+  }
+
+  ctx.closePath();
+  ctx.fill();
+};
+
+SignaturePad.prototype._drawDot = function (point) {
+  const ctx = this._ctx;
+  const width = (typeof this.dotSize) === 'function' ? this.dotSize() : this.dotSize;
+
+  ctx.beginPath();
+  this._drawPoint(point.x, point.y, width);
+  ctx.closePath();
+  ctx.fill();
+};
+
+SignaturePad.prototype._fromData = function (pointGroups, drawCurve, drawDot) {
+  for (let i = 0; i < pointGroups.length; i += 1) {
+    const group = pointGroups[i];
+
+    if (group.length > 1) {
+      for (let j = 0; j < group.length; j += 1) {
+        const rawPoint = group[j];
+        const point = new Point(rawPoint.x, rawPoint.y, rawPoint.time);
+        const color = rawPoint.color;
+
+        if (j === 0) {
+          // First point in a group. Nothing to draw yet.
+
+          // All points in the group have the same color, so it's enough to set
+          // penColor just at the beginning.
+          this.penColor = color;
+          this._reset();
+
+          this._addPoint(point);
+        } else if (j !== group.length - 1) {
+          // Middle point in a group.
+          const { curve, widths } = this._addPoint(point);
+          if (curve && widths) {
+            drawCurve(curve, widths, color);
+          }
+        } else {
+          // Last point in a group. Do nothing.
+        }
+      }
+    } else {
+      this._reset();
+      const rawPoint = group[0];
+      drawDot(rawPoint);
+    }
+  }
+};
+
+SignaturePad.prototype._toSVG = function () {
+  const pointGroups = this._data;
+  const canvas = this._canvas;
+  const ratio = Math.max(window.devicePixelRatio || 1, 1);
+  const minX = 0;
+  const minY = 0;
+  const maxX = canvas.width / ratio;
+  const maxY = canvas.height / ratio;
+  const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
+
+  svg.setAttributeNS(null, 'width', canvas.width);
+  svg.setAttributeNS(null, 'height', canvas.height);
+
+  this._fromData(
+    pointGroups,
+    (curve, widths, color) => {
+      const path = document.createElement('path');
+
+      // Need to check curve for NaN values, these pop up when drawing
+      // lines on the canvas that are not continuous. E.g. Sharp corners
+      // or stopping mid-stroke and than continuing without lifting mouse.
+      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', (widths.end * 2.25).toFixed(3));
+        path.setAttribute('stroke', color);
+        path.setAttribute('fill', 'none');
+        path.setAttribute('stroke-linecap', 'round');
+
+        svg.appendChild(path);
+      }
+    },
+    (rawPoint) => {
+      const circle = document.createElement('circle');
+      const dotSize = (typeof this.dotSize) === 'function' ? this.dotSize() : this.dotSize;
+      circle.setAttribute('r', dotSize);
+      circle.setAttribute('cx', rawPoint.x);
+      circle.setAttribute('cy', rawPoint.y);
+      circle.setAttribute('fill', rawPoint.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;
+
+  // IE hack for missing innerHTML property on SVGElement
+  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);
+};
+
+SignaturePad.prototype.fromData = function (pointGroups) {
+  this.clear();
+
+  this._fromData(
+    pointGroups,
+    (curve, widths) => this._drawCurve(curve, widths.start, widths.end),
+    rawPoint => this._drawDot(rawPoint),
+  );
+
+  this._data = pointGroups;
+};
+
+SignaturePad.prototype.toData = function () {
+  return this._data;
+};
+
+export default SignaturePad;

public/high/plugins/signature_pad/src/throttle.js

@@ -0,0 +1,34 @@
+/* eslint-disable */
+
+// http://stackoverflow.com/a/27078401/815507
+export default function throttle(func, wait, options) {
+  var context, args, result;
+  var timeout = null;
+  var previous = 0;
+  if (!options) options = {};
+  var later = function () {
+    previous = options.leading === false ? 0 : Date.now();
+    timeout = null;
+    result = func.apply(context, args);
+    if (!timeout) context = args = null;
+  };
+  return function () {
+    var now = Date.now();
+    if (!previous && options.leading === false) previous = now;
+    var remaining = wait - (now - previous);
+    context = this;
+    args = arguments;
+    if (remaining <= 0 || remaining > wait) {
+      if (timeout) {
+        clearTimeout(timeout);
+        timeout = null;
+      }
+      previous = now;
+      result = func.apply(context, args);
+      if (!timeout) context = args = null;
+    } else if (!timeout && options.trailing !== false) {
+      timeout = setTimeout(later, remaining);
+    }
+    return result;
+  };
+}