| 1 |
/* |
| 2 |
* Signature Pad v2.3.2 |
| 3 |
* https://github.com/szimek/signature_pad |
| 4 |
* |
| 5 |
* Copyright 2017 Szymon Nowak |
| 6 |
* Released under the MIT license |
| 7 |
* |
| 8 |
* The main idea and some parts of the code (e.g. drawing variable width Bézier curve) are taken from: |
| 9 |
* http://corner.squareup.com/2012/07/smoother-signatures.html |
| 10 |
* |
| 11 |
* Implementation of interpolation using cubic Bézier curves is taken from: |
| 12 |
* http://benknowscode.wordpress.com/2012/09/14/path-interpolation-using-cubic-bezier-and-control-point-estimation-in-javascript |
| 13 |
* |
| 14 |
* Algorithm for approximated length of a Bézier curve is taken from: |
| 15 |
* http://www.lemoda.net/maths/bezier-length/index.html |
| 16 |
* |
| 17 |
* Source Code adjusted to fit into the Vik Booking framework. |
| 18 |
* |
| 19 |
*/ |
| 20 |
|
| 21 |
(function (global, factory) { |
| 22 |
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() : |
| 23 |
typeof define === 'function' && define.amd ? define(factory) : |
| 24 |
(global.SignaturePad = factory()); |
| 25 |
}(this, (function () { 'use strict'; |
| 26 |
|
| 27 |
function Point(x, y, time) { |
| 28 |
this.x = x; |
| 29 |
this.y = y; |
| 30 |
this.time = time || new Date().getTime(); |
| 31 |
} |
| 32 |
|
| 33 |
Point.prototype.velocityFrom = function (start) { |
| 34 |
return this.time !== start.time ? this.distanceTo(start) / (this.time - start.time) : 1; |
| 35 |
}; |
| 36 |
|
| 37 |
Point.prototype.distanceTo = function (start) { |
| 38 |
return Math.sqrt(Math.pow(this.x - start.x, 2) + Math.pow(this.y - start.y, 2)); |
| 39 |
}; |
| 40 |
|
| 41 |
Point.prototype.equals = function (other) { |
| 42 |
return this.x === other.x && this.y === other.y && this.time === other.time; |
| 43 |
}; |
| 44 |
|
| 45 |
function Bezier(startPoint, control1, control2, endPoint) { |
| 46 |
this.startPoint = startPoint; |
| 47 |
this.control1 = control1; |
| 48 |
this.control2 = control2; |
| 49 |
this.endPoint = endPoint; |
| 50 |
} |
| 51 |
|
| 52 |
// Returns approximated length. |
| 53 |
Bezier.prototype.length = function () { |
| 54 |
var steps = 10; |
| 55 |
var length = 0; |
| 56 |
var px = void 0; |
| 57 |
var py = void 0; |
| 58 |
|
| 59 |
for (var i = 0; i <= steps; i += 1) { |
| 60 |
var t = i / steps; |
| 61 |
var cx = this._point(t, this.startPoint.x, this.control1.x, this.control2.x, this.endPoint.x); |
| 62 |
var cy = this._point(t, this.startPoint.y, this.control1.y, this.control2.y, this.endPoint.y); |
| 63 |
if (i > 0) { |
| 64 |
var xdiff = cx - px; |
| 65 |
var ydiff = cy - py; |
| 66 |
length += Math.sqrt(xdiff * xdiff + ydiff * ydiff); |
| 67 |
} |
| 68 |
px = cx; |
| 69 |
py = cy; |
| 70 |
} |
| 71 |
|
| 72 |
return length; |
| 73 |
}; |
| 74 |
|
| 75 |
/* eslint-disable no-multi-spaces, space-in-parens */ |
| 76 |
Bezier.prototype._point = function (t, start, c1, c2, end) { |
| 77 |
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; |
| 78 |
}; |
| 79 |
/* eslint-disable */ |
| 80 |
|
| 81 |
function throttle(func, wait, options) { |
| 82 |
var context, args, result; |
| 83 |
var timeout = null; |
| 84 |
var previous = 0; |
| 85 |
if (!options) options = {}; |
| 86 |
var later = function later() { |
| 87 |
previous = options.leading === false ? 0 : Date.now(); |
| 88 |
timeout = null; |
| 89 |
result = func.apply(context, args); |
| 90 |
if (!timeout) context = args = null; |
| 91 |
}; |
| 92 |
return function () { |
| 93 |
var now = Date.now(); |
| 94 |
if (!previous && options.leading === false) previous = now; |
| 95 |
var remaining = wait - (now - previous); |
| 96 |
context = this; |
| 97 |
args = arguments; |
| 98 |
if (remaining <= 0 || remaining > wait) { |
| 99 |
if (timeout) { |
| 100 |
clearTimeout(timeout); |
| 101 |
timeout = null; |
| 102 |
} |
| 103 |
previous = now; |
| 104 |
result = func.apply(context, args); |
| 105 |
if (!timeout) context = args = null; |
| 106 |
} else if (!timeout && options.trailing !== false) { |
| 107 |
timeout = setTimeout(later, remaining); |
| 108 |
} |
| 109 |
return result; |
| 110 |
}; |
| 111 |
} |
| 112 |
|
| 113 |
function SignaturePad(canvas, options) { |
| 114 |
var self = this; |
| 115 |
var opts = options || {}; |
| 116 |
|
| 117 |
this.velocityFilterWeight = opts.velocityFilterWeight || 0.7; |
| 118 |
this.minWidth = opts.minWidth || 0.5; |
| 119 |
this.maxWidth = opts.maxWidth || 2.5; |
| 120 |
this.throttle = 'throttle' in opts ? opts.throttle : 16; // in miliseconds |
| 121 |
this.minDistance = 'minDistance' in opts ? opts.minDistance : 5; |
| 122 |
|
| 123 |
if (this.throttle) { |
| 124 |
this._strokeMoveUpdate = throttle(SignaturePad.prototype._strokeUpdate, this.throttle); |
| 125 |
} else { |
| 126 |
this._strokeMoveUpdate = SignaturePad.prototype._strokeUpdate; |
| 127 |
} |
| 128 |
|
| 129 |
this.dotSize = opts.dotSize || function () { |
| 130 |
return (this.minWidth + this.maxWidth) / 2; |
| 131 |
}; |
| 132 |
this.penColor = opts.penColor || 'black'; |
| 133 |
this.backgroundColor = opts.backgroundColor || 'rgba(0,0,0,0)'; |
| 134 |
this.onBegin = opts.onBegin; |
| 135 |
this.onEnd = opts.onEnd; |
| 136 |
|
| 137 |
this._canvas = canvas; |
| 138 |
this._ctx = canvas.getContext('2d'); |
| 139 |
this.clear(); |
| 140 |
|
| 141 |
// We need add these inline so they are available to unbind while still having |
| 142 |
// access to 'self' we could use _.bind but it's not worth adding a dependency. |
| 143 |
this._handleMouseDown = function (event) { |
| 144 |
if (event.which === 1) { |
| 145 |
self._mouseButtonDown = true; |
| 146 |
self._strokeBegin(event); |
| 147 |
} |
| 148 |
}; |
| 149 |
|
| 150 |
this._handleMouseMove = function (event) { |
| 151 |
if (self._mouseButtonDown) { |
| 152 |
self._strokeMoveUpdate(event); |
| 153 |
} |
| 154 |
}; |
| 155 |
|
| 156 |
this._handleMouseUp = function (event) { |
| 157 |
if (event.which === 1 && self._mouseButtonDown) { |
| 158 |
self._mouseButtonDown = false; |
| 159 |
self._strokeEnd(event); |
| 160 |
} |
| 161 |
}; |
| 162 |
|
| 163 |
this._handleTouchStart = function (event) { |
| 164 |
if (event.targetTouches.length === 1) { |
| 165 |
var touch = event.changedTouches[0]; |
| 166 |
self._strokeBegin(touch); |
| 167 |
} |
| 168 |
}; |
| 169 |
|
| 170 |
this._handleTouchMove = function (event) { |
| 171 |
// Prevent scrolling. |
| 172 |
event.preventDefault(); |
| 173 |
|
| 174 |
var touch = event.targetTouches[0]; |
| 175 |
self._strokeMoveUpdate(touch); |
| 176 |
}; |
| 177 |
|
| 178 |
this._handleTouchEnd = function (event) { |
| 179 |
var wasCanvasTouched = event.target === self._canvas; |
| 180 |
if (wasCanvasTouched) { |
| 181 |
event.preventDefault(); |
| 182 |
self._strokeEnd(event); |
| 183 |
} |
| 184 |
}; |
| 185 |
|
| 186 |
// Enable mouse and touch event handlers |
| 187 |
this.on(); |
| 188 |
} |
| 189 |
|
| 190 |
// Public methods |
| 191 |
SignaturePad.prototype.clear = function () { |
| 192 |
var ctx = this._ctx; |
| 193 |
var canvas = this._canvas; |
| 194 |
|
| 195 |
ctx.fillStyle = this.backgroundColor; |
| 196 |
ctx.clearRect(0, 0, canvas.width, canvas.height); |
| 197 |
ctx.fillRect(0, 0, canvas.width, canvas.height); |
| 198 |
|
| 199 |
this._data = []; |
| 200 |
this._reset(); |
| 201 |
this._isEmpty = true; |
| 202 |
}; |
| 203 |
|
| 204 |
SignaturePad.prototype.fromDataURL = function (dataUrl) { |
| 205 |
var _this = this; |
| 206 |
|
| 207 |
var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {}; |
| 208 |
|
| 209 |
var image = new Image(); |
| 210 |
var ratio = options.ratio || window.devicePixelRatio || 1; |
| 211 |
var width = options.width || this._canvas.width / ratio; |
| 212 |
var height = options.height || this._canvas.height / ratio; |
| 213 |
|
| 214 |
this._reset(); |
| 215 |
image.src = dataUrl; |
| 216 |
image.onload = function () { |
| 217 |
_this._ctx.drawImage(image, 0, 0, width, height); |
| 218 |
}; |
| 219 |
this._isEmpty = false; |
| 220 |
}; |
| 221 |
|
| 222 |
SignaturePad.prototype.toDataURL = function (type) { |
| 223 |
var _canvas; |
| 224 |
|
| 225 |
switch (type) { |
| 226 |
case 'image/svg+xml': |
| 227 |
return this._toSVG(); |
| 228 |
default: |
| 229 |
for (var _len = arguments.length, options = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) { |
| 230 |
options[_key - 1] = arguments[_key]; |
| 231 |
} |
| 232 |
return (_canvas = this._canvas).toDataURL.apply(_canvas, [type].concat(options)); |
| 233 |
} |
| 234 |
}; |
| 235 |
|
| 236 |
SignaturePad.prototype.on = function () { |
| 237 |
this._handleMouseEvents(); |
| 238 |
this._handleTouchEvents(); |
| 239 |
}; |
| 240 |
|
| 241 |
SignaturePad.prototype.off = function () { |
| 242 |
this._canvas.removeEventListener('mousedown', this._handleMouseDown); |
| 243 |
this._canvas.removeEventListener('mousemove', this._handleMouseMove); |
| 244 |
document.removeEventListener('mouseup', this._handleMouseUp); |
| 245 |
|
| 246 |
this._canvas.removeEventListener('touchstart', this._handleTouchStart); |
| 247 |
this._canvas.removeEventListener('touchmove', this._handleTouchMove); |
| 248 |
this._canvas.removeEventListener('touchend', this._handleTouchEnd); |
| 249 |
}; |
| 250 |
|
| 251 |
SignaturePad.prototype.isEmpty = function () { |
| 252 |
return this._isEmpty; |
| 253 |
}; |
| 254 |
|
| 255 |
// Private methods |
| 256 |
SignaturePad.prototype._strokeBegin = function (event) { |
| 257 |
this._data.push([]); |
| 258 |
this._reset(); |
| 259 |
this._strokeUpdate(event); |
| 260 |
|
| 261 |
if (typeof this.onBegin === 'function') { |
| 262 |
this.onBegin(event); |
| 263 |
} |
| 264 |
}; |
| 265 |
|
| 266 |
SignaturePad.prototype._strokeUpdate = function (event) { |
| 267 |
var x = event.clientX; |
| 268 |
var y = event.clientY; |
| 269 |
|
| 270 |
var point = this._createPoint(x, y); |
| 271 |
var lastPointGroup = this._data[this._data.length - 1]; |
| 272 |
var lastPoint = lastPointGroup && lastPointGroup[lastPointGroup.length - 1]; |
| 273 |
var isLastPointTooClose = lastPoint && point.distanceTo(lastPoint) < this.minDistance; |
| 274 |
|
| 275 |
// Skip this point if it's too close to the previous one |
| 276 |
if (!(lastPoint && isLastPointTooClose)) { |
| 277 |
var _addPoint = this._addPoint(point), |
| 278 |
curve = _addPoint.curve, |
| 279 |
widths = _addPoint.widths; |
| 280 |
|
| 281 |
if (curve && widths) { |
| 282 |
this._drawCurve(curve, widths.start, widths.end); |
| 283 |
} |
| 284 |
|
| 285 |
this._data[this._data.length - 1].push({ |
| 286 |
x: point.x, |
| 287 |
y: point.y, |
| 288 |
time: point.time, |
| 289 |
color: this.penColor |
| 290 |
}); |
| 291 |
} |
| 292 |
}; |
| 293 |
|
| 294 |
SignaturePad.prototype._strokeEnd = function (event) { |
| 295 |
var canDrawCurve = this.points.length > 2; |
| 296 |
var point = this.points[0]; // Point instance |
| 297 |
|
| 298 |
if (!canDrawCurve && point) { |
| 299 |
this._drawDot(point); |
| 300 |
} |
| 301 |
|
| 302 |
if (point) { |
| 303 |
var lastPointGroup = this._data[this._data.length - 1]; |
| 304 |
var lastPoint = lastPointGroup[lastPointGroup.length - 1]; // plain object |
| 305 |
|
| 306 |
// When drawing a dot, there's only one point in a group, so without this check |
| 307 |
// such group would end up with exactly the same 2 points. |
| 308 |
if (!point.equals(lastPoint)) { |
| 309 |
lastPointGroup.push({ |
| 310 |
x: point.x, |
| 311 |
y: point.y, |
| 312 |
time: point.time, |
| 313 |
color: this.penColor |
| 314 |
}); |
| 315 |
} |
| 316 |
} |
| 317 |
|
| 318 |
if (typeof this.onEnd === 'function') { |
| 319 |
this.onEnd(event); |
| 320 |
} |
| 321 |
}; |
| 322 |
|
| 323 |
SignaturePad.prototype._handleMouseEvents = function () { |
| 324 |
this._mouseButtonDown = false; |
| 325 |
|
| 326 |
this._canvas.addEventListener('mousedown', this._handleMouseDown); |
| 327 |
this._canvas.addEventListener('mousemove', this._handleMouseMove); |
| 328 |
document.addEventListener('mouseup', this._handleMouseUp); |
| 329 |
}; |
| 330 |
|
| 331 |
SignaturePad.prototype._handleTouchEvents = function () { |
| 332 |
// Pass touch events to canvas element on mobile IE11 and Edge. |
| 333 |
this._canvas.style.msTouchAction = 'none'; |
| 334 |
this._canvas.style.touchAction = 'none'; |
| 335 |
|
| 336 |
this._canvas.addEventListener('touchstart', this._handleTouchStart); |
| 337 |
this._canvas.addEventListener('touchmove', this._handleTouchMove); |
| 338 |
this._canvas.addEventListener('touchend', this._handleTouchEnd); |
| 339 |
}; |
| 340 |
|
| 341 |
SignaturePad.prototype._reset = function () { |
| 342 |
this.points = []; |
| 343 |
this._lastVelocity = 0; |
| 344 |
this._lastWidth = (this.minWidth + this.maxWidth) / 2; |
| 345 |
this._ctx.fillStyle = this.penColor; |
| 346 |
}; |
| 347 |
|
| 348 |
SignaturePad.prototype._createPoint = function (x, y, time) { |
| 349 |
var rect = this._canvas.getBoundingClientRect(); |
| 350 |
|
| 351 |
return new Point(x - rect.left, y - rect.top, time || new Date().getTime()); |
| 352 |
}; |
| 353 |
|
| 354 |
SignaturePad.prototype._addPoint = function (point) { |
| 355 |
var points = this.points; |
| 356 |
var tmp = void 0; |
| 357 |
|
| 358 |
points.push(point); |
| 359 |
|
| 360 |
if (points.length > 2) { |
| 361 |
// To reduce the initial lag make it work with 3 points |
| 362 |
// by copying the first point to the beginning. |
| 363 |
if (points.length === 3) points.unshift(points[0]); |
| 364 |
|
| 365 |
tmp = this._calculateCurveControlPoints(points[0], points[1], points[2]); |
| 366 |
var c2 = tmp.c2; |
| 367 |
tmp = this._calculateCurveControlPoints(points[1], points[2], points[3]); |
| 368 |
var c3 = tmp.c1; |
| 369 |
var curve = new Bezier(points[1], c2, c3, points[2]); |
| 370 |
var widths = this._calculateCurveWidths(curve); |
| 371 |
|
| 372 |
// Remove the first element from the list, |
| 373 |
// so that we always have no more than 4 points in points array. |
| 374 |
points.shift(); |
| 375 |
|
| 376 |
return { curve: curve, widths: widths }; |
| 377 |
} |
| 378 |
|
| 379 |
return {}; |
| 380 |
}; |
| 381 |
|
| 382 |
SignaturePad.prototype._calculateCurveControlPoints = function (s1, s2, s3) { |
| 383 |
var dx1 = s1.x - s2.x; |
| 384 |
var dy1 = s1.y - s2.y; |
| 385 |
var dx2 = s2.x - s3.x; |
| 386 |
var dy2 = s2.y - s3.y; |
| 387 |
|
| 388 |
var m1 = { x: (s1.x + s2.x) / 2.0, y: (s1.y + s2.y) / 2.0 }; |
| 389 |
var m2 = { x: (s2.x + s3.x) / 2.0, y: (s2.y + s3.y) / 2.0 }; |
| 390 |
|
| 391 |
var l1 = Math.sqrt(dx1 * dx1 + dy1 * dy1); |
| 392 |
var l2 = Math.sqrt(dx2 * dx2 + dy2 * dy2); |
| 393 |
|
| 394 |
var dxm = m1.x - m2.x; |
| 395 |
var dym = m1.y - m2.y; |
| 396 |
|
| 397 |
var k = l2 / (l1 + l2); |
| 398 |
var cm = { x: m2.x + dxm * k, y: m2.y + dym * k }; |
| 399 |
|
| 400 |
var tx = s2.x - cm.x; |
| 401 |
var ty = s2.y - cm.y; |
| 402 |
|
| 403 |
return { |
| 404 |
c1: new Point(m1.x + tx, m1.y + ty), |
| 405 |
c2: new Point(m2.x + tx, m2.y + ty) |
| 406 |
}; |
| 407 |
}; |
| 408 |
|
| 409 |
SignaturePad.prototype._calculateCurveWidths = function (curve) { |
| 410 |
var startPoint = curve.startPoint; |
| 411 |
var endPoint = curve.endPoint; |
| 412 |
var widths = { start: null, end: null }; |
| 413 |
|
| 414 |
var velocity = this.velocityFilterWeight * endPoint.velocityFrom(startPoint) + (1 - this.velocityFilterWeight) * this._lastVelocity; |
| 415 |
|
| 416 |
var newWidth = this._strokeWidth(velocity); |
| 417 |
|
| 418 |
widths.start = this._lastWidth; |
| 419 |
widths.end = newWidth; |
| 420 |
|
| 421 |
this._lastVelocity = velocity; |
| 422 |
this._lastWidth = newWidth; |
| 423 |
|
| 424 |
return widths; |
| 425 |
}; |
| 426 |
|
| 427 |
SignaturePad.prototype._strokeWidth = function (velocity) { |
| 428 |
return Math.max(this.maxWidth / (velocity + 1), this.minWidth); |
| 429 |
}; |
| 430 |
|
| 431 |
SignaturePad.prototype._drawPoint = function (x, y, size) { |
| 432 |
var ctx = this._ctx; |
| 433 |
|
| 434 |
ctx.moveTo(x, y); |
| 435 |
ctx.arc(x, y, size, 0, 2 * Math.PI, false); |
| 436 |
this._isEmpty = false; |
| 437 |
}; |
| 438 |
|
| 439 |
SignaturePad.prototype._drawCurve = function (curve, startWidth, endWidth) { |
| 440 |
var ctx = this._ctx; |
| 441 |
var widthDelta = endWidth - startWidth; |
| 442 |
var drawSteps = Math.floor(curve.length()); |
| 443 |
|
| 444 |
ctx.beginPath(); |
| 445 |
|
| 446 |
for (var i = 0; i < drawSteps; i += 1) { |
| 447 |
// Calculate the Bezier (x, y) coordinate for this step. |
| 448 |
var t = i / drawSteps; |
| 449 |
var tt = t * t; |
| 450 |
var ttt = tt * t; |
| 451 |
var u = 1 - t; |
| 452 |
var uu = u * u; |
| 453 |
var uuu = uu * u; |
| 454 |
|
| 455 |
var x = uuu * curve.startPoint.x; |
| 456 |
x += 3 * uu * t * curve.control1.x; |
| 457 |
x += 3 * u * tt * curve.control2.x; |
| 458 |
x += ttt * curve.endPoint.x; |
| 459 |
|
| 460 |
var y = uuu * curve.startPoint.y; |
| 461 |
y += 3 * uu * t * curve.control1.y; |
| 462 |
y += 3 * u * tt * curve.control2.y; |
| 463 |
y += ttt * curve.endPoint.y; |
| 464 |
|
| 465 |
var width = startWidth + ttt * widthDelta; |
| 466 |
this._drawPoint(x, y, width); |
| 467 |
} |
| 468 |
|
| 469 |
ctx.closePath(); |
| 470 |
ctx.fill(); |
| 471 |
}; |
| 472 |
|
| 473 |
SignaturePad.prototype._drawDot = function (point) { |
| 474 |
var ctx = this._ctx; |
| 475 |
var width = typeof this.dotSize === 'function' ? this.dotSize() : this.dotSize; |
| 476 |
|
| 477 |
ctx.beginPath(); |
| 478 |
this._drawPoint(point.x, point.y, width); |
| 479 |
ctx.closePath(); |
| 480 |
ctx.fill(); |
| 481 |
}; |
| 482 |
|
| 483 |
SignaturePad.prototype._fromData = function (pointGroups, drawCurve, drawDot) { |
| 484 |
for (var i = 0; i < pointGroups.length; i += 1) { |
| 485 |
var group = pointGroups[i]; |
| 486 |
|
| 487 |
if (group.length > 1) { |
| 488 |
for (var j = 0; j < group.length; j += 1) { |
| 489 |
var rawPoint = group[j]; |
| 490 |
var point = new Point(rawPoint.x, rawPoint.y, rawPoint.time); |
| 491 |
var color = rawPoint.color; |
| 492 |
|
| 493 |
if (j === 0) { |
| 494 |
// First point in a group. Nothing to draw yet. |
| 495 |
|
| 496 |
// All points in the group have the same color, so it's enough to set |
| 497 |
// penColor just at the beginning. |
| 498 |
this.penColor = color; |
| 499 |
this._reset(); |
| 500 |
|
| 501 |
this._addPoint(point); |
| 502 |
} else if (j !== group.length - 1) { |
| 503 |
// Middle point in a group. |
| 504 |
var _addPoint2 = this._addPoint(point), |
| 505 |
curve = _addPoint2.curve, |
| 506 |
widths = _addPoint2.widths; |
| 507 |
|
| 508 |
if (curve && widths) { |
| 509 |
drawCurve(curve, widths, color); |
| 510 |
} |
| 511 |
} else { |
| 512 |
// Last point in a group. Do nothing. |
| 513 |
} |
| 514 |
} |
| 515 |
} else { |
| 516 |
this._reset(); |
| 517 |
var _rawPoint = group[0]; |
| 518 |
drawDot(_rawPoint); |
| 519 |
} |
| 520 |
} |
| 521 |
}; |
| 522 |
|
| 523 |
SignaturePad.prototype._toSVG = function () { |
| 524 |
var _this2 = this; |
| 525 |
|
| 526 |
var pointGroups = this._data; |
| 527 |
var canvas = this._canvas; |
| 528 |
var ratio = Math.max(window.devicePixelRatio || 1, 1); |
| 529 |
var minX = 0; |
| 530 |
var minY = 0; |
| 531 |
var maxX = canvas.width / ratio; |
| 532 |
var maxY = canvas.height / ratio; |
| 533 |
var svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg'); |
| 534 |
|
| 535 |
svg.setAttributeNS(null, 'width', canvas.width); |
| 536 |
svg.setAttributeNS(null, 'height', canvas.height); |
| 537 |
|
| 538 |
this._fromData(pointGroups, function (curve, widths, color) { |
| 539 |
var path = document.createElement('path'); |
| 540 |
|
| 541 |
// Need to check curve for NaN values, these pop up when drawing |
| 542 |
// lines on the canvas that are not continuous. E.g. Sharp corners |
| 543 |
// or stopping mid-stroke and than continuing without lifting mouse. |
| 544 |
if (!isNaN(curve.control1.x) && !isNaN(curve.control1.y) && !isNaN(curve.control2.x) && !isNaN(curve.control2.y)) { |
| 545 |
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)); |
| 546 |
|
| 547 |
path.setAttribute('d', attr); |
| 548 |
path.setAttribute('stroke-width', (widths.end * 2.25).toFixed(3)); |
| 549 |
path.setAttribute('stroke', color); |
| 550 |
path.setAttribute('fill', 'none'); |
| 551 |
path.setAttribute('stroke-linecap', 'round'); |
| 552 |
|
| 553 |
svg.appendChild(path); |
| 554 |
} |
| 555 |
}, function (rawPoint) { |
| 556 |
var circle = document.createElement('circle'); |
| 557 |
var dotSize = typeof _this2.dotSize === 'function' ? _this2.dotSize() : _this2.dotSize; |
| 558 |
circle.setAttribute('r', dotSize); |
| 559 |
circle.setAttribute('cx', rawPoint.x); |
| 560 |
circle.setAttribute('cy', rawPoint.y); |
| 561 |
circle.setAttribute('fill', rawPoint.color); |
| 562 |
|
| 563 |
svg.appendChild(circle); |
| 564 |
}); |
| 565 |
|
| 566 |
var prefix = 'data:image/svg+xml;base64,'; |
| 567 |
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 + '"') + '>'; |
| 568 |
var body = svg.innerHTML; |
| 569 |
|
| 570 |
// IE hack for missing innerHTML property on SVGElement |
| 571 |
if (body === undefined) { |
| 572 |
var dummy = document.createElement('dummy'); |
| 573 |
var nodes = svg.childNodes; |
| 574 |
dummy.innerHTML = ''; |
| 575 |
|
| 576 |
for (var i = 0; i < nodes.length; i += 1) { |
| 577 |
dummy.appendChild(nodes[i].cloneNode(true)); |
| 578 |
} |
| 579 |
|
| 580 |
body = dummy.innerHTML; |
| 581 |
} |
| 582 |
|
| 583 |
var footer = '</svg>'; |
| 584 |
var data = header + body + footer; |
| 585 |
|
| 586 |
return prefix + btoa(data); |
| 587 |
}; |
| 588 |
|
| 589 |
SignaturePad.prototype.fromData = function (pointGroups) { |
| 590 |
var _this3 = this; |
| 591 |
|
| 592 |
this.clear(); |
| 593 |
|
| 594 |
this._fromData(pointGroups, function (curve, widths) { |
| 595 |
return _this3._drawCurve(curve, widths.start, widths.end); |
| 596 |
}, function (rawPoint) { |
| 597 |
return _this3._drawDot(rawPoint); |
| 598 |
}); |
| 599 |
|
| 600 |
this._data = pointGroups; |
| 601 |
}; |
| 602 |
|
| 603 |
SignaturePad.prototype.toData = function () { |
| 604 |
return this._data; |
| 605 |
}; |
| 606 |
|
| 607 |
return SignaturePad; |
| 608 |
|
| 609 |
}))); |
