2 * This script refer to:
5 * Availability: https://github.com/szimek/signature_pad
9 * @class Roo.bootstrap.BezierSignature
10 * @extends Roo.bootstrap.Component
11 * Bootstrap BezierSignature class
14 * Create a new BezierSignature
15 * @param {Object} config The config object
18 Roo.bootstrap.BezierSignature = function(config){
19 Roo.bootstrap.BezierSignature.superclass.constructor.call(this, config);
25 Roo.extend(Roo.bootstrap.BezierSignature, Roo.bootstrap.Component, {
34 * @cfg(int) canvas height
36 canvas_height: '200px',
39 * @cfg(float or function) Radius of a single dot.
44 * @cfg(float) Minimum width of a line. Defaults to 0.5.
49 * @cfg(float) Maximum width of a line. Defaults to 2.5.
54 * @cfg(integer) Draw the next point at most once per every x milliseconds. Set it to 0 to turn off throttling. Defaults to 16.
59 * @cfg(integer) Add the next point only if the previous one is farther than x pixels. Defaults to 5.
64 * @cfg(string) Color used to clear the background. Can be any color format accepted by context.fillStyle. Defaults to "rgba(0,0,0,0)" (transparent black). Use a non-transparent color e.g. "rgb(255,255,255)" (opaque white) if you'd like to save signatures as JPEG images.
66 bg_color: 'rgba(0, 0, 0, 0)',
69 * @cfg(string) Color used to draw the lines. Can be any color format accepted by context.fillStyle. Defaults to "black".
74 * @cfg(float) Weight used to modify new velocity based on the previous velocity. Defaults to 0.7.
76 velocity_filter_weight: 0.7,
79 * @cfg(function) Callback when stroke begin.
84 * @cfg(function) Callback when stroke end.
88 getAutoCreate : function()
90 var cls = 'roo-signature column';
93 cls += ' ' + this.cls;
103 for(var i = 0; i < col_sizes.length; i++) {
104 if(this[col_sizes[i]]) {
105 cls += " col-"+col_sizes[i]+"-"+this[col_sizes[i]];
115 cls: 'roo-signature-body',
119 cls: 'roo-signature-body-canvas',
120 height: this.canvas_height,
121 width: this.canvas_width
131 initEvents: function()
133 Roo.bootstrap.BezierSignature.superclass.initEvents.call(this);
135 var canvas = this.canvasEl();
137 // mouse && touch event swapping...
138 canvas.dom.style.touchAction = 'none';
139 canvas.dom.style.msTouchAction = 'none';
141 this.mouse_btn_down = false;
142 canvas.on('mousedown', this._handleMouseDown, this);
143 canvas.on('mousemove', this._handleMouseMove, this);
144 Roo.select('html').first().on('mouseup', this._handleMouseUp, this);
146 if (window.ontouchstart) {
147 canvas.on('touchstart', this._handleTouchStart, this);
148 canvas.on('touchmove', this._handleTouchMove, this);
149 canvas.on('touchend', this._handleTouchEnd, this);
152 Roo.EventManager.onWindowResize(this.resize, this, true);
161 var style = window.getComputedStyle ?
162 getComputedStyle(this.el.dom, null) : this.el.dom.currentStyle;
164 var padding_left = parseInt(style.paddingLeft) || 0;
165 var padding_right = parseInt(style.paddingRight) || 0;
167 this.canvasEl().dom.width = this.el.dom.clientWidth - padding_left - padding_right;
170 _handleMouseDown: function(e)
172 if (e.browserEvent.which === 1) {
173 this.mouse_btn_down = true;
178 _handleMouseMove: function (e)
180 if (this.mouse_btn_down) {
181 this.strokeMoveUpdate(e);
185 _handleMouseUp: function (e)
187 if (e.browserEvent.which === 1 && this.mouse_btn_down) {
188 this.mouse_btn_down = false;
193 _handleTouchStart: function (e) {
195 if (e.browserEvent.targetTouches.length === 1) {
196 // var touch = e.browserEvent.changedTouches[0];
197 // this.strokeBegin(touch);
199 this.strokeBegin(e); // assume e catching the correct xy...
203 _handleTouchMove: function (e) {
205 // var touch = event.targetTouches[0];
206 // _this._strokeMoveUpdate(touch);
207 this._strokeMoveUpdate(e);
210 _handleTouchEnd: function (e) {
211 var wasCanvasTouched = e.target === this.canvasEl().dom;
212 if (wasCanvasTouched) {
214 // var touch = event.changedTouches[0];
215 // _this._strokeEnd(touch);
221 this._lastPoints = [];
222 this._lastVelocity = 0;
223 this._lastWidth = (this.min_width + this.max_width) / 2;
224 this.canvasElCtx().fillStyle = this.dot_color;
227 strokeMoveUpdate: function(e)
229 this.strokeUpdate(e);
232 this.throttle(this.strokeUpdate, this.throttle);
235 this.strokeUpdate(e);
239 strokeBegin: function(e)
241 var newPointGroup = {
242 color: this.dot_color,
246 if (typeof this.onBegin === 'function') {
250 this.curve_data.push(newPointGroup);
252 this.strokeUpdate(e);
255 strokeUpdate: function(e)
257 var rect = this.canvasEl().dom.getBoundingClientRect();
258 var point = new this.Point(e.xy[0] - rect.left, e.xy[1] - rect.top, new Date().getTime());
259 var lastPointGroup = this.curve_data[this.curve_data.length - 1];
260 var lastPoints = lastPointGroup.points;
261 var lastPoint = lastPoints.length > 0 && lastPoints[lastPoints.length - 1];
262 var isLastPointTooClose = lastPoint
263 ? point.distanceTo(lastPoint) <= this.min_distance
265 var color = lastPointGroup.color;
266 if (!lastPoint || !(lastPoint && isLastPointTooClose)) {
267 var curve = this.addPoint(point);
269 this.drawDot({color: color, point: point});
272 this.drawCurve({color: color, curve: curve});
282 strokeEnd: function(e)
284 this.strokeUpdate(e);
285 if (typeof this.onEnd === 'function') {
290 addPoint: function (point) {
291 var _lastPoints = this._lastPoints;
292 _lastPoints.push(point);
293 if (_lastPoints.length > 2) {
294 if (_lastPoints.length === 3) {
295 _lastPoints.unshift(_lastPoints[0]);
297 var widths = this.calculateCurveWidths(_lastPoints[1], _lastPoints[2]);
298 var curve = this.Bezier.fromPoints(_lastPoints, widths, this);
305 calculateCurveWidths: function (startPoint, endPoint) {
306 var velocity = this.velocity_filter_weight * endPoint.velocityFrom(startPoint) +
307 (1 - this.velocity_filter_weight) * this._lastVelocity;
309 var newWidth = Math.max(this.max_width / (velocity + 1), this.min_width);
312 start: this._lastWidth
315 this._lastVelocity = velocity;
316 this._lastWidth = newWidth;
320 drawDot: function (_a) {
321 var color = _a.color, point = _a.point;
322 var ctx = this.canvasElCtx();
323 var width = typeof this.dot_size === 'function' ? this.dot_size() : this.dot_size;
325 this.drawCurveSegment(point.x, point.y, width);
327 ctx.fillStyle = color;
331 drawCurve: function (_a) {
332 var color = _a.color, curve = _a.curve;
333 var ctx = this.canvasElCtx();
334 var widthDelta = curve.endWidth - curve.startWidth;
335 var drawSteps = Math.floor(curve.length()) * 2;
337 ctx.fillStyle = color;
338 for (var i = 0; i < drawSteps; i += 1) {
339 var t = i / drawSteps;
345 var x = uuu * curve.startPoint.x;
346 x += 3 * uu * t * curve.control1.x;
347 x += 3 * u * tt * curve.control2.x;
348 x += ttt * curve.endPoint.x;
349 var y = uuu * curve.startPoint.y;
350 y += 3 * uu * t * curve.control1.y;
351 y += 3 * u * tt * curve.control2.y;
352 y += ttt * curve.endPoint.y;
353 var width = curve.startWidth + ttt * widthDelta;
354 this.drawCurveSegment(x, y, width);
360 drawCurveSegment: function (x, y, width) {
361 var ctx = this.canvasElCtx();
363 ctx.arc(x, y, width, 0, 2 * Math.PI, false);
364 this.is_empty = false;
369 var ctx = this.canvasElCtx();
370 var canvas = this.canvasEl().dom;
371 ctx.fillStyle = this.bg_color;
372 ctx.clearRect(0, 0, canvas.width, canvas.height);
373 ctx.fillRect(0, 0, canvas.width, canvas.height);
374 this.curve_data = [];
376 this.is_empty = true;
381 return this.el.select('canvas',true).first();
384 canvasElCtx: function()
386 return this.el.select('canvas',true).first().dom.getContext('2d');
389 getImage: function(type)
396 return this.canvasEl().dom.toDataURL('image/'+type, false);
399 drawFromImage: function(img_src)
401 var img = new Image();
405 this.canvasElCtx().drawImage(img, 0, 0);
408 // Bezier Point Constructor
409 Point: (function () {
410 function Point(x, y, time) {
413 this.time = time || Date.now();
415 Point.prototype.distanceTo = function (start) {
416 return Math.sqrt(Math.pow(this.x - start.x, 2) + Math.pow(this.y - start.y, 2));
418 Point.prototype.equals = function (other) {
419 return this.x === other.x && this.y === other.y && this.time === other.time;
421 Point.prototype.velocityFrom = function (start) {
422 return this.time !== start.time
423 ? this.distanceTo(start) / (this.time - start.time)
430 // Bezier Constructor
431 Bezier: (function () {
432 function Bezier(startPoint, control2, control1, endPoint, startWidth, endWidth) {
433 this.startPoint = startPoint;
434 this.control2 = control2;
435 this.control1 = control1;
436 this.endPoint = endPoint;
437 this.startWidth = startWidth;
438 this.endWidth = endWidth;
440 Bezier.fromPoints = function (points, widths, scope) {
441 var c2 = this.calculateControlPoints(points[0], points[1], points[2], scope).c2;
442 var c3 = this.calculateControlPoints(points[1], points[2], points[3], scope).c1;
443 return new Bezier(points[1], c2, c3, points[2], widths.start, widths.end);
445 Bezier.calculateControlPoints = function (s1, s2, s3, scope) {
446 var dx1 = s1.x - s2.x;
447 var dy1 = s1.y - s2.y;
448 var dx2 = s2.x - s3.x;
449 var dy2 = s2.y - s3.y;
450 var m1 = { x: (s1.x + s2.x) / 2.0, y: (s1.y + s2.y) / 2.0 };
451 var m2 = { x: (s2.x + s3.x) / 2.0, y: (s2.y + s3.y) / 2.0 };
452 var l1 = Math.sqrt(dx1 * dx1 + dy1 * dy1);
453 var l2 = Math.sqrt(dx2 * dx2 + dy2 * dy2);
454 var dxm = m1.x - m2.x;
455 var dym = m1.y - m2.y;
456 var k = l2 / (l1 + l2);
457 var cm = { x: m2.x + dxm * k, y: m2.y + dym * k };
458 var tx = s2.x - cm.x;
459 var ty = s2.y - cm.y;
461 c1: new scope.Point(m1.x + tx, m1.y + ty),
462 c2: new scope.Point(m2.x + tx, m2.y + ty)
465 Bezier.prototype.length = function () {
470 for (var i = 0; i <= steps; i += 1) {
472 var cx = this.point(t, this.startPoint.x, this.control1.x, this.control2.x, this.endPoint.x);
473 var cy = this.point(t, this.startPoint.y, this.control1.y, this.control2.y, this.endPoint.y);
477 length += Math.sqrt(xdiff * xdiff + ydiff * ydiff);
484 Bezier.prototype.point = function (t, start, c1, c2, end) {
485 return (start * (1.0 - t) * (1.0 - t) * (1.0 - t))
486 + (3.0 * c1 * (1.0 - t) * (1.0 - t) * t)
487 + (3.0 * c2 * (1.0 - t) * t * t)
493 throttle: function(fn, wait) {
494 if (wait === void 0) { wait = 250; }
500 var later = function () {
501 previous = Date.now();
503 result = fn.apply(storedContext, storedArgs);
505 storedContext = null;
509 return function wrapper() {
511 for (var _i = 0; _i < arguments.length; _i++) {
512 args[_i] = arguments[_i];
514 var now = Date.now();
515 var remaining = wait - (now - previous);
516 storedContext = this;
518 if (remaining <= 0 || remaining > wait) {
520 clearTimeout(timeout);
524 result = fn.apply(storedContext, storedArgs);
526 storedContext = null;
531 timeout = window.setTimeout(later, remaining);