!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):t.SignaturePad=e()}(this,function(){"use strict";var t=function(){function t(t,e,o){this.x=t,this.y=e,this.time=o||Date.now()}return t.prototype.distanceTo=function(t){return Math.sqrt(Math.pow(this.x-t.x,2)+Math.pow(this.y-t.y,2))},t.prototype.equals=function(t){return this.x===t.x&&this.y===t.y&&this.time===t.time},t.prototype.velocityFrom=function(t){return this.time!==t.time?this.distanceTo(t)/(this.time-t.time):0},t}(),e=function(){function e(t,e,o,n,i,s){this.startPoint=t,this.control2=e,this.control1=o,this.endPoint=n,this.startWidth=i,this.endWidth=s}return e.fromPoints=function(t,o){var n=this.calculateControlPoints(t[0],t[1],t[2]).c2,i=this.calculateControlPoints(t[1],t[2],t[3]).c1;return new e(t[1],n,i,t[2],o.start,o.end)},e.calculateControlPoints=function(e,o,n){var i=e.x-o.x,s=e.y-o.y,r=o.x-n.x,h=o.y-n.y,a=(e.x+o.x)/2,c=(e.y+o.y)/2,u=(o.x+n.x)/2,d=(o.y+n.y)/2,l=Math.sqrt(i*i+s*s),v=Math.sqrt(r*r+h*h),p=v/(l+v),f=u+(a-u)*p,_=d+(c-d)*p,m=o.x-f,y=o.y-_;return{c1:new t(a+m,c+y),c2:new t(u+m,d+y)}},e.prototype.length=function(){for(var t,e,o=0,n=0;n<=10;n+=1){var i=n/10,s=this.point(i,this.startPoint.x,this.control1.x,this.control2.x,this.endPoint.x),r=this.point(i,this.startPoint.y,this.control1.y,this.control2.y,this.endPoint.y);if(n>0){var h=s-t,a=r-e;o+=Math.sqrt(h*h+a*a)}t=s,e=r}return o},e.prototype.point=function(t,e,o,n,i){return e*(1-t)*(1-t)*(1-t)+3*o*(1-t)*(1-t)*t+3*n*(1-t)*t*t+i*t*t*t},e}();return function(){function o(t,e){void 0===e&&(e={});var n=this;this.canvas=t,this.options=e,this._handleMouseDown=function(t){1===t.which&&(n._mouseButtonDown=!0,n._strokeBegin(t))},this._handleMouseMove=function(t){n._mouseButtonDown&&n._strokeMoveUpdate(t)},this._handleMouseUp=function(t){1===t.which&&n._mouseButtonDown&&(n._mouseButtonDown=!1,n._strokeEnd(t))},this._handleTouchStart=function(t){if(t.preventDefault(),1===t.targetTouches.length){var e=t.changedTouches[0];n._strokeBegin(e)}},this._handleTouchMove=function(t){t.preventDefault();var e=t.targetTouches[0];n._strokeMoveUpdate(e)},this._handleTouchEnd=function(t){if(t.target===n.canvas){t.preventDefault();var e=t.changedTouches[0];n._strokeEnd(e)}},this.velocityFilterWeight=e.velocityFilterWeight||.7,this.minWidth=e.minWidth||.5,this.maxWidth=e.maxWidth||2.5,this.throttle="throttle"in e?e.throttle:16,this.minDistance="minDistance"in e?e.minDistance:5,this.throttle?this._strokeMoveUpdate=function(t,e){void 0===e&&(e=250);var o,n,i,s=0,r=null,h=function(){s=Date.now(),r=null,o=t.apply(n,i),r||(n=null,i=[])};return function(){for(var a=[],c=0;c<arguments.length;c++)a[c]=arguments[c];var u=Date.now(),d=e-(u-s);return n=this,i=a,d<=0||d>e?(r&&(clearTimeout(r),r=null),s=u,o=t.apply(n,i),r||(n=null,i=[])):r||(r=window.setTimeout(h,d)),o}}(o.prototype._strokeUpdate,this.throttle):this._strokeMoveUpdate=o.prototype._strokeUpdate,this.dotSize=e.dotSize||function(){return(this.minWidth+this.maxWidth)/2},this.penColor=e.penColor||"black",this.backgroundColor=e.backgroundColor||"rgba(0,0,0,0)",this.onBegin=e.onBegin,this.onEnd=e.onEnd,this._ctx=t.getContext("2d"),this.clear(),this.on()}return o.prototype.clear=function(){var t=this._ctx,e=this.canvas;t.fillStyle=this.backgroundColor,t.clearRect(0,0,e.width,e.height),t.fillRect(0,0,e.width,e.height),this._data=[],this._reset(),this._isEmpty=!0},o.prototype.fromDataURL=function(t,e,o){var n=this;void 0===e&&(e={});var i=new Image,s=e.ratio||window.devicePixelRatio||1,r=e.width||this.canvas.width/s,h=e.height||this.canvas.height/s;this._reset(),i.onload=function(){n._ctx.drawImage(i,0,0,r,h),o&&o()},i.onerror=function(t){o&&o(t)},i.src=t,this._isEmpty=!1},o.prototype.toDataURL=function(t,e){switch(void 0===t&&(t="image/png"),t){case"image/svg+xml":return this._toSVG();default:return this.canvas.toDataURL(t,e)}},o.prototype.on=function(){this.canvas.style.touchAction="none",this.canvas.style.msTouchAction="none",window.PointerEvent?this._handlePointerEvents():(this._handleMouseEvents(),"ontouchstart"in window&&this._handleTouchEvents())},o.prototype.off=function(){this.canvas.style.touchAction="auto",this.canvas.style.msTouchAction="auto",this.canvas.removeEventListener("pointerdown",this._handleMouseDown),this.canvas.removeEventListener("pointermove",this._handleMouseMove),document.removeEventListener("pointerup",this._handleMouseUp),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)},o.prototype.isEmpty=function(){return this._isEmpty},o.prototype.fromData=function(t){var e=this;this.clear(),this._fromData(t,function(t){var o=t.color,n=t.curve;return e._drawCurve({color:o,curve:n})},function(t){var o=t.color,n=t.point;return e._drawDot({color:o,point:n})}),this._data=t},o.prototype.toData=function(){return this._data},o.prototype._strokeBegin=function(t){var e={color:this.penColor,points:[]};this._data.push(e),this._reset(),this._strokeUpdate(t),"function"==typeof this.onBegin&&this.onBegin(t)},o.prototype._strokeUpdate=function(t){var e=t.clientX,o=t.clientY,n=this._createPoint(e,o),i=this._data[this._data.length-1],s=i.points,r=s.length>0&&s[s.length-1],h=!!r&&n.distanceTo(r)<=this.minDistance,a=i.color;if(!r||!r||!h){var c=this._addPoint(n);r?c&&this._drawCurve({color:a,curve:c}):this._drawDot({color:a,point:n}),s.push({time:n.time,x:n.x,y:n.y})}},o.prototype._strokeEnd=function(t){this._strokeUpdate(t),"function"==typeof this.onEnd&&this.onEnd(t)},o.prototype._handlePointerEvents=function(){this._mouseButtonDown=!1,this.canvas.addEventListener("pointerdown",this._handleMouseDown),this.canvas.addEventListener("pointermove",this._handleMouseMove),document.addEventListener("pointerup",this._handleMouseUp)},o.prototype._handleMouseEvents=function(){this._mouseButtonDown=!1,this.canvas.addEventListener("mousedown",this._handleMouseDown),this.canvas.addEventListener("mousemove",this._handleMouseMove),document.addEventListener("mouseup",this._handleMouseUp)},o.prototype._handleTouchEvents=function(){this.canvas.addEventListener("touchstart",this._handleTouchStart),this.canvas.addEventListener("touchmove",this._handleTouchMove),this.canvas.addEventListener("touchend",this._handleTouchEnd)},o.prototype._reset=function(){this._lastPoints=[],this._lastVelocity=0,this._lastWidth=(this.minWidth+this.maxWidth)/2,this._ctx.fillStyle=this.penColor},o.prototype._createPoint=function(e,o){var n=this.canvas.getBoundingClientRect();return new t(e-n.left,o-n.top,(new Date).getTime())},o.prototype._addPoint=function(t){var o=this._lastPoints;if(o.push(t),o.length>2){3===o.length&&o.unshift(o[0]);var n=this._calculateCurveWidths(o[1],o[2]),i=e.fromPoints(o,n);return o.shift(),i}return null},o.prototype._calculateCurveWidths=function(t,e){var o=this.velocityFilterWeight*e.velocityFrom(t)+(1-this.velocityFilterWeight)*this._lastVelocity,n=this._strokeWidth(o),i={end:n,start:this._lastWidth};return this._lastVelocity=o,this._lastWidth=n,i},o.prototype._strokeWidth=function(t){return Math.max(this.maxWidth/(t+1),this.minWidth)},o.prototype._drawCurveSegment=function(t,e,o){var n=this._ctx;n.moveTo(t,e),n.arc(t,e,o,0,2*Math.PI,!1),this._isEmpty=!1},o.prototype._drawCurve=function(t){var e=t.color,o=t.curve,n=this._ctx,i=o.endWidth-o.startWidth,s=2*Math.floor(o.length());n.beginPath(),n.fillStyle=e;for(var r=0;r<s;r+=1){var h=r/s,a=h*h,c=a*h,u=1-h,d=u*u,l=d*u,v=l*o.startPoint.x;v+=3*d*h*o.control1.x,v+=3*u*a*o.control2.x,v+=c*o.endPoint.x;var p=l*o.startPoint.y;p+=3*d*h*o.control1.y,p+=3*u*a*o.control2.y,p+=c*o.endPoint.y;var f=o.startWidth+c*i;this._drawCurveSegment(v,p,f)}n.closePath(),n.fill()},o.prototype._drawDot=function(t){var e=t.color,o=t.point,n=this._ctx,i="function"==typeof this.dotSize?this.dotSize():this.dotSize;n.beginPath(),this._drawCurveSegment(o.x,o.y,i),n.closePath(),n.fillStyle=e,n.fill()},o.prototype._fromData=function(e,o,n){for(var i=0,s=e;i<s.length;i++){var r=s[i],h=r.color,a=r.points;if(a.length>1)for(var c=0;c<a.length;c+=1){var u=a[c],d=new t(u.x,u.y,u.time);this.penColor=h,0===c&&this._reset();var l=this._addPoint(d);l&&o({color:h,curve:l})}else this._reset(),n({color:h,point:a[0]})}},o.prototype._toSVG=function(){var t=this,e=this._data,o=Math.max(window.devicePixelRatio||1,1),n=this.canvas.width/o,i=this.canvas.height/o,s=document.createElementNS("http://www.w3.org/2000/svg","svg");s.setAttribute("width",this.canvas.width.toString()),s.setAttribute("height",this.canvas.height.toString()),this._fromData(e,function(t){var e=t.color,o=t.curve,n=document.createElement("path");if(!(isNaN(o.control1.x)||isNaN(o.control1.y)||isNaN(o.control2.x)||isNaN(o.control2.y))){var i="M "+o.startPoint.x.toFixed(3)+","+o.startPoint.y.toFixed(3)+" C "+o.control1.x.toFixed(3)+","+o.control1.y.toFixed(3)+" "+o.control2.x.toFixed(3)+","+o.control2.y.toFixed(3)+" "+o.endPoint.x.toFixed(3)+","+o.endPoint.y.toFixed(3);n.setAttribute("d",i),n.setAttribute("stroke-width",(2.25*o.endWidth).toFixed(3)),n.setAttribute("stroke",e),n.setAttribute("fill","none"),n.setAttribute("stroke-linecap","round"),s.appendChild(n)}},function(e){var o=e.color,n=e.point,i=document.createElement("circle"),r="function"==typeof t.dotSize?t.dotSize():t.dotSize;i.setAttribute("r",r.toString()),i.setAttribute("cx",n.x.toString()),i.setAttribute("cy",n.y.toString()),i.setAttribute("fill",o),s.appendChild(i)});var r='<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 '+n+" "+i+'" width="'+n+'" height="'+i+'">',h=s.innerHTML;if(void 0===h){var a=document.createElement("dummy"),c=s.childNodes;a.innerHTML="";for(var u=0;u<c.length;u+=1)a.appendChild(c[u].cloneNode(!0));h=a.innerHTML}return"data:image/svg+xml;base64,"+btoa(r+h+"</svg>")},o}()});