Roo.bootstrap.BezierSignature = function(config){
Roo.bootstrap.BezierSignature.superclass.constructor.call(this, config);
this.addEvents({
"resize" : true
});
};
Roo.extend(Roo.bootstrap.BezierSignature, Roo.bootstrap.Component,
{
curve_data: [],
is_empty: true,
mouse_btn_down: true,
canvas_height: '200px',
dot_size: false,
min_width: 0.5,
max_width: 2.5,
throttle: 16,
min_distance: 5,
bg_color: 'rgba(0, 0, 0, 0)',
dot_color: 'black',
velocity_filter_weight: 0.7,
onBegin: false,
onEnd: false,
getAutoCreate : function()
{
var cls = 'roo-signature column';
if(this.cls){
cls += ' ' + this.cls;
}
var col_sizes = [
'lg',
'md',
'sm',
'xs'
];
for(var i = 0; i < col_sizes.length; i++) {
if(this[col_sizes[i]]) {
cls += " col-"+col_sizes[i]+"-"+this[col_sizes[i]];
}
}
var cfg = {
tag: 'div',
cls: cls,
cn: [
{
tag: 'div',
cls: 'roo-signature-body',
cn: [
{
tag: 'canvas',
cls: 'roo-signature-body-canvas',
height: this.canvas_height,
width: this.canvas_width
}
]
},
{
tag: 'input',
type: 'file',
style: 'display: none'
}
]
};
return cfg;
},
initEvents: function()
{
Roo.bootstrap.BezierSignature.superclass.initEvents.call(this);
var canvas = this.canvasEl();
canvas.dom.style.touchAction = 'none';
canvas.dom.style.msTouchAction = 'none';
this.mouse_btn_down = false;
canvas.on('mousedown', this._handleMouseDown, this);
canvas.on('mousemove', this._handleMouseMove, this);
Roo.select('html').first().on('mouseup', this._handleMouseUp, this);
if (window.PointerEvent) {
canvas.on('pointerdown', this._handleMouseDown, this);
canvas.on('pointermove', this._handleMouseMove, this);
Roo.select('html').first().on('pointerup', this._handleMouseUp, this);
}
if ('ontouchstart' in window) {
canvas.on('touchstart', this._handleTouchStart, this);
canvas.on('touchmove', this._handleTouchMove, this);
canvas.on('touchend', this._handleTouchEnd, this);
}
Roo.EventManager.onWindowResize(this.resize, this, true);
this.fileEl().on('change', this.uploadImage, this);
this.clear();
this.resize();
},
resize: function(){
var canvas = this.canvasEl().dom;
var ctx = this.canvasElCtx();
var img_data = false;
if(canvas.width > 0) {
var img_data = ctx.getImageData(0, 0, canvas.width, canvas.height);
}
canvas.width = 0;
var style = window.getComputedStyle ?
getComputedStyle(this.el.dom, null) : this.el.dom.currentStyle;
var padding_left = parseInt(style.paddingLeft) || 0;
var padding_right = parseInt(style.paddingRight) || 0;
canvas.width = this.el.dom.clientWidth - padding_left - padding_right;
if(img_data) {
ctx.putImageData(img_data, 0, 0);
}
},
_handleMouseDown: function(e)
{
if (e.browserEvent.which === 1) {
this.mouse_btn_down = true;
this.strokeBegin(e);
}
},
_handleMouseMove: function (e)
{
if (this.mouse_btn_down) {
this.strokeMoveUpdate(e);
}
},
_handleMouseUp: function (e)
{
if (e.browserEvent.which === 1 && this.mouse_btn_down) {
this.mouse_btn_down = false;
this.strokeEnd(e);
}
},
_handleTouchStart: function (e) {
e.preventDefault();
if (e.browserEvent.targetTouches.length === 1) {
this.strokeBegin(e); }
},
_handleTouchMove: function (e) {
e.preventDefault();
this.strokeMoveUpdate(e);
},
_handleTouchEnd: function (e) {
var wasCanvasTouched = e.target === this.canvasEl().dom;
if (wasCanvasTouched) {
e.preventDefault();
this.strokeEnd(e);
}
},
reset: function () {
this._lastPoints = [];
this._lastVelocity = 0;
this._lastWidth = (this.min_width + this.max_width) / 2;
this.canvasElCtx().fillStyle = this.dot_color;
},
strokeMoveUpdate: function(e)
{
this.strokeUpdate(e);
if (this.throttle) {
this.throttleStroke(this.strokeUpdate, this.throttle);
}
else {
this.strokeUpdate(e);
}
},
strokeBegin: function(e)
{
var newPointGroup = {
color: this.dot_color,
points: []
};
if (typeof this.onBegin === 'function') {
this.onBegin(e);
}
this.curve_data.push(newPointGroup);
this.reset();
this.strokeUpdate(e);
},
strokeUpdate: function(e)
{
var rect = this.canvasEl().dom.getBoundingClientRect();
var point = new this.Point(e.xy[0] - rect.left, e.xy[1] - rect.top, new Date().getTime());
var lastPointGroup = this.curve_data[this.curve_data.length - 1];
var lastPoints = lastPointGroup.points;
var lastPoint = lastPoints.length > 0 && lastPoints[lastPoints.length - 1];
var isLastPointTooClose = lastPoint
? point.distanceTo(lastPoint) <= this.min_distance
: 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
});
}
},
strokeEnd: function(e)
{
this.strokeUpdate(e);
if (typeof this.onEnd === 'function') {
this.onEnd(e);
}
},
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 = this.Bezier.fromPoints(_lastPoints, widths, this);
_lastPoints.shift();
return curve;
}
return null;
},
calculateCurveWidths: function (startPoint, endPoint) {
var velocity = this.velocity_filter_weight * endPoint.velocityFrom(startPoint) +
(1 - this.velocity_filter_weight) * this._lastVelocity;
var newWidth = Math.max(this.max_width / (velocity + 1), this.min_width);
var widths = {
end: newWidth,
start: this._lastWidth
};
this._lastVelocity = velocity;
this._lastWidth = newWidth;
return widths;
},
drawDot: function (_a) {
var color = _a.color, point = _a.point;
var ctx = this.canvasElCtx();
var width = typeof this.dot_size === 'function' ? this.dot_size() : this.dot_size;
ctx.beginPath();
this.drawCurveSegment(point.x, point.y, width);
ctx.closePath();
ctx.fillStyle = color;
ctx.fill();
},
drawCurve: function (_a) {
var color = _a.color, curve = _a.curve;
var ctx = this.canvasElCtx();
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 = curve.startWidth + ttt * widthDelta;
this.drawCurveSegment(x, y, width);
}
ctx.closePath();
ctx.fill();
},
drawCurveSegment: function (x, y, width) {
var ctx = this.canvasElCtx();
ctx.moveTo(x, y);
ctx.arc(x, y, width, 0, 2 * Math.PI, false);
this.is_empty = false;
},
clear: function()
{
var ctx = this.canvasElCtx();
var canvas = this.canvasEl().dom;
ctx.fillStyle = this.bg_color;
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillRect(0, 0, canvas.width, canvas.height);
this.curve_data = [];
this.reset();
this.is_empty = true;
},
fileEl: function()
{
return this.el.select('input',true).first();
},
canvasEl: function()
{
return this.el.select('canvas',true).first();
},
canvasElCtx: function()
{
return this.el.select('canvas',true).first().dom.getContext('2d');
},
getImage: function(type)
{
if(this.is_empty) {
return false;
}
return this.canvasEl().dom.toDataURL('image/'+type, 1);
},
drawFromImage: function(img_src)
{
var img = new Image();
img.onload = function(){
this.canvasElCtx().drawImage(img, 0, 0);
}.bind(this);
img.src = img_src;
this.is_empty = false;
},
selectImage: function()
{
this.fileEl().dom.click();
},
uploadImage: function(e)
{
var reader = new FileReader();
reader.onload = function(e){
var img = new Image();
img.onload = function(){
this.reset();
this.canvasElCtx().drawImage(img, 0, 0);
}.bind(this);
img.src = e.target.result;
}.bind(this);
reader.readAsDataURL(e.target.files[0]);
},
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;
}()),
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, scope) {
var c2 = this.calculateControlPoints(points[0], points[1], points[2], scope).c2;
var c3 = this.calculateControlPoints(points[1], points[2], points[3], scope).c1;
return new Bezier(points[1], c2, c3, points[2], widths.start, widths.end);
};
Bezier.calculateControlPoints = function (s1, s2, s3, scope) {
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 scope.Point(m1.x + tx, m1.y + ty),
c2: new scope.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;
}()),
throttleStroke: function(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;
};
}
});