signature_pad/dist/signature_pad.min.js

Library for drawing smooth signatures.

/*!
 * Signature Pad v5.1.4 | https://github.com/szimek/signature_pad
 * (c) 2026 Szymon Nowak | Released under the MIT license
 */

var b=class{x;y;pressure;time;constructor(o,t,e,i){if(isNaN(o)||isNaN(t))throw new Error(`Point is invalid: (${o}, ${t})`);this.x=+o,this.y=+t,this.pressure=e||0,this.time=i||Date.now()}distanceTo(o){return Math.sqrt(Math.pow(this.x-o.x,2)+Math.pow(this.y-o.y,2))}equals(o){return this.x===o.x&&this.y===o.y&&this.pressure===o.pressure&&this.time===o.time}velocityFrom(o){return this.time!==o.time?this.distanceTo(o)/(this.time-o.time):0}};var g=class _{constructor(o,t,e,i,n,r){this.startPoint=o;this.control2=t;this.control1=e;this.endPoint=i;this.startWidth=n;this.endWidth=r}startPoint;control2;control1;endPoint;startWidth;endWidth;static fromPoints(o,t){let e=this.calculateControlPoints(o[0],o[1],o[2]).c2,i=this.calculateControlPoints(o[1],o[2],o[3]).c1;return new _(o[1],e,i,o[2],t.start,t.end)}static calculateControlPoints(o,t,e){let i=o.x-t.x,n=o.y-t.y,r=t.x-e.x,l=t.y-e.y,a={x:(o.x+t.x)/2,y:(o.y+t.y)/2},c={x:(t.x+e.x)/2,y:(t.y+e.y)/2},h=Math.sqrt(i*i+n*n),s=Math.sqrt(r*r+l*l),u=a.x-c.x,p=a.y-c.y,d=h+s==0?0:s/(h+s),m={x:c.x+u*d,y:c.y+p*d},v=t.x-m.x,f=t.y-m.y;return{c1:new b(a.x+v,a.y+f),c2:new b(c.x+v,c.y+f)}}length(){let t=0,e,i;for(let n=0;n<=10;n+=1){let r=n/10,l=this.point(r,this.startPoint.x,this.control1.x,this.control2.x,this.endPoint.x),a=this.point(r,this.startPoint.y,this.control1.y,this.control2.y,this.endPoint.y);if(n>0){let c=l-e,h=a-i;t+=Math.sqrt(c*c+h*h)}e=l,i=a}return t}point(o,t,e,i,n){return t*(1-o)*(1-o)*(1-o)+3*e*(1-o)*(1-o)*o+3*i*(1-o)*o*o+n*o*o*o}};var P=class{_et;constructor(){try{this._et=new EventTarget}catch{this._et=document}}addEventListener(o,t,e){this._et.addEventListener(o,t,e)}dispatchEvent(o){return this._et.dispatchEvent(o)}removeEventListener(o,t,e){this._et.removeEventListener(o,t,e)}};function w(_,o=250){let t=0,e=null,i,n,r,l=()=>{t=Date.now(),e=null,i=_.apply(n,r),e||(n=null,r=[])};return function(...c){let h=Date.now(),s=o-(h-t);return n=this,r=c,s<=0||s>o?(e&&(clearTimeout(e),e=null),t=h,i=_.apply(n,r),e||(n=null,r=[])):e||(e=window.setTimeout(l,s)),i}}var x=class _ extends P{constructor(t,e={}){super();this.canvas=t;this.velocityFilterWeight=e.velocityFilterWeight||.7,this.minWidth=e.minWidth||.5,this.maxWidth=e.maxWidth||2.5,this.throttle=e.throttle??16,this.minDistance=e.minDistance??5,this.dotSize=e.dotSize||0,this.penColor=e.penColor||"black",this.backgroundColor=e.backgroundColor||"rgba(0,0,0,0)",this.compositeOperation=e.compositeOperation||"source-over",this.canvasContextOptions=e.canvasContextOptions??{},this._strokeMoveUpdate=this.throttle?w(_.prototype._strokeUpdate,this.throttle):_.prototype._strokeUpdate,this._handleMouseDown=this._handleMouseDown.bind(this),this._handleMouseMove=this._handleMouseMove.bind(this),this._handleMouseUp=this._handleMouseUp.bind(this),this._handleTouchStart=this._handleTouchStart.bind(this),this._handleTouchMove=this._handleTouchMove.bind(this),this._handleTouchEnd=this._handleTouchEnd.bind(this),this._handlePointerDown=this._handlePointerDown.bind(this),this._handlePointerMove=this._handlePointerMove.bind(this),this._handlePointerUp=this._handlePointerUp.bind(this),this._handlePointerCancel=this._handlePointerCancel.bind(this),this._handleTouchCancel=this._handleTouchCancel.bind(this),this._ctx=t.getContext("2d",this.canvasContextOptions),this.clear(),this.on()}canvas;dotSize;minWidth;maxWidth;penColor;minDistance;velocityFilterWeight;compositeOperation;backgroundColor;throttle;canvasContextOptions;_ctx;_drawingStroke=!1;_isEmpty=!0;_dataUrl;_dataUrlOptions;_lastPoints=[];_data=[];_lastVelocity=0;_lastWidth=0;_strokeMoveUpdate;_strokePointerId;clear(){let{_ctx:t,canvas:e}=this;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._getPointGroupOptions()),this._isEmpty=!0,this._dataUrl=void 0,this._dataUrlOptions=void 0,this._strokePointerId=void 0}redraw(){let t=this._data,e=this._dataUrl,i=this._dataUrlOptions;this.clear(),e&&this.fromDataURL(e,i),this.fromData(t,{clear:!1})}fromDataURL(t,e={}){return new Promise((i,n)=>{let r=new Image,l=e.ratio||window.devicePixelRatio||1,a=e.width||this.canvas.width/l,c=e.height||this.canvas.height/l,h=e.xOffset||0,s=e.yOffset||0;this._reset(this._getPointGroupOptions()),r.onload=()=>{this._ctx.drawImage(r,h,s,a,c),i()},r.onerror=u=>{n(u)},r.crossOrigin="anonymous",r.src=t,this._isEmpty=!1,this._dataUrl=t,this._dataUrlOptions={...e}})}toDataURL(t="image/png",e){return t==="image/svg+xml"?(typeof e!="object"&&(e=void 0),`data:image/svg+xml;base64,${btoa(this.toSVG(e))}`):(typeof e!="number"&&(e=void 0),this.canvas.toDataURL(t,e))}on(){this.canvas.style.touchAction="none",this.canvas.style.msTouchAction="none",this.canvas.style.userSelect="none",this.canvas.style.webkitUserSelect="none";let t=/Macintosh/.test(navigator.userAgent)&&"ontouchstart"in document;window.PointerEvent&&!t?this._handlePointerEvents():(this._handleMouseEvents(),"ontouchstart"in window&&this._handleTouchEvents())}off(){this.canvas.style.touchAction="auto",this.canvas.style.msTouchAction="auto",this.canvas.style.userSelect="auto",this.canvas.style.webkitUserSelect="auto",this.canvas.removeEventListener("pointerdown",this._handlePointerDown),this.canvas.removeEventListener("mousedown",this._handleMouseDown),this.canvas.removeEventListener("touchstart",this._handleTouchStart),this._removeMoveUpEventListeners()}_getListenerFunctions(){let t=window.document===this.canvas.ownerDocument?window:this.canvas.ownerDocument.defaultView??this.canvas.ownerDocument;return{addEventListener:t.addEventListener.bind(t),removeEventListener:t.removeEventListener.bind(t)}}_removeMoveUpEventListeners(){let{removeEventListener:t}=this._getListenerFunctions();t("pointermove",this._handlePointerMove),t("pointerup",this._handlePointerUp),t("pointercancel",this._handlePointerCancel),t("mousemove",this._handleMouseMove),t("mouseup",this._handleMouseUp),t("touchmove",this._handleTouchMove),t("touchend",this._handleTouchEnd),t("touchcancel",this._handleTouchCancel)}isEmpty(){return this._isEmpty}fromData(t,{clear:e=!0}={}){e&&this.clear(),this._fromData(t,this._drawCurve.bind(this),this._drawDot.bind(this),this._drawLine.bind(this)),this._data=this._data.concat(t)}toData(){return this._data}_isLeftButtonPressed(t,e){return e?t.buttons===1:(t.buttons&1)===1}_pointerEventToSignatureEvent(t){return{event:t,type:t.type,x:t.clientX,y:t.clientY,pressure:"pressure"in t?t.pressure:0}}_touchEventToSignatureEvent(t){let e=t.changedTouches[0];return{event:t,type:t.type,x:e.clientX,y:e.clientY,pressure:e.force}}_handleMouseDown(t){!this._isLeftButtonPressed(t,!0)||this._drawingStroke||this._strokeBegin(this._pointerEventToSignatureEvent(t))}_handleMouseMove(t){if(!this._isLeftButtonPressed(t,!0)||!this._drawingStroke){this._strokeEnd(this._pointerEventToSignatureEvent(t),!1);return}this._strokeMoveUpdate(this._pointerEventToSignatureEvent(t))}_handleMouseUp(t){this._isLeftButtonPressed(t)||this._strokeEnd(this._pointerEventToSignatureEvent(t))}_handleTouchStart(t){t.targetTouches.length!==1||this._drawingStroke||(t.cancelable&&t.preventDefault(),this._strokeBegin(this._touchEventToSignatureEvent(t)))}_handleTouchMove(t){if(t.targetTouches.length===1){if(t.cancelable&&t.preventDefault(),!this._drawingStroke){this._strokeEnd(this._touchEventToSignatureEvent(t),!1);return}this._strokeMoveUpdate(this._touchEventToSignatureEvent(t))}}_handleTouchEnd(t){t.targetTouches.length===0&&(t.cancelable&&t.preventDefault(),this._strokeEnd(this._touchEventToSignatureEvent(t)))}_handlePointerCancel(t){this._allowPointerId(t)&&(t.preventDefault(),this._strokeEnd(this._pointerEventToSignatureEvent(t),!1))}_handleTouchCancel(t){t.cancelable&&t.preventDefault(),this._strokeEnd(this._touchEventToSignatureEvent(t),!1)}_getPointerId(t){return t.persistentDeviceId||t.pointerId}_allowPointerId(t,e=!1){return typeof this._strokePointerId>"u"?e:this._getPointerId(t)===this._strokePointerId}_handlePointerDown(t){this._drawingStroke||!this._isLeftButtonPressed(t)||!this._allowPointerId(t,!0)||(this._strokePointerId=this._getPointerId(t),t.preventDefault(),this._strokeBegin(this._pointerEventToSignatureEvent(t)))}_handlePointerMove(t){if(this._allowPointerId(t)){if(!this._isLeftButtonPressed(t,!0)||!this._drawingStroke){this._strokeEnd(this._pointerEventToSignatureEvent(t),!1);return}t.preventDefault(),this._strokeMoveUpdate(this._pointerEventToSignatureEvent(t))}}_handlePointerUp(t){this._isLeftButtonPressed(t)||!this._allowPointerId(t)||(t.preventDefault(),this._strokeEnd(this._pointerEventToSignatureEvent(t)))}_getPointGroupOptions(t){return{penColor:t&&"penColor"in t?t.penColor:this.penColor,dotSize:t&&"dotSize"in t?t.dotSize:this.dotSize,minWidth:t&&"minWidth"in t?t.minWidth:this.minWidth,maxWidth:t&&"maxWidth"in t?t.maxWidth:this.maxWidth,velocityFilterWeight:t&&"velocityFilterWeight"in t?t.velocityFilterWeight:this.velocityFilterWeight,compositeOperation:t&&"compositeOperation"in t?t.compositeOperation:this.compositeOperation}}_strokeBegin(t){if(!this.dispatchEvent(new CustomEvent("beginStroke",{detail:t,cancelable:!0})))return;let{addEventListener:i}=this._getListenerFunctions();switch(t.event.type){case"mousedown":i("mousemove",this._handleMouseMove,{passive:!1}),i("mouseup",this._handleMouseUp,{passive:!1});break;case"touchstart":i("touchmove",this._handleTouchMove,{passive:!1}),i("touchend",this._handleTouchEnd,{passive:!1}),i("touchcancel",this._handleTouchCancel,{passive:!1});break;case"pointerdown":i("pointermove",this._handlePointerMove,{passive:!1}),i("pointerup",this._handlePointerUp,{passive:!1}),i("pointercancel",this._handlePointerCancel,{passive:!1});break;default:}this._drawingStroke=!0;let n=this._getPointGroupOptions(),r={...n,points:[]};this._data.push(r),this._reset(n),this._strokeUpdate(t)}_strokeUpdate(t){if(!this._drawingStroke)return;if(this._data.length===0){this._strokeBegin(t);return}this.dispatchEvent(new CustomEvent("beforeUpdateStroke",{detail:t}));let e=this._createPoint(t.x,t.y,t.pressure),i=this._data[this._data.length-1],n=i.points,r=n.length>0&&n[n.length-1],l=r?e.distanceTo(r)<=this.minDistance:!1,a=this._getPointGroupOptions(i);if(!r||!(r&&l)){let c=this._addPoint(e,a);r?c&&this._drawCurve(c,a):this._drawDot(e,a),n.push({time:e.time,x:e.x,y:e.y,pressure:e.pressure})}this.dispatchEvent(new CustomEvent("afterUpdateStroke",{detail:t}))}_strokeEnd(t,e=!0){this._removeMoveUpEventListeners(),this._drawingStroke&&(e&&this._strokeUpdate(t),this._drawingStroke=!1,this._strokePointerId=void 0,this.dispatchEvent(new CustomEvent("endStroke",{detail:t})))}_handlePointerEvents(){this._drawingStroke=!1,this.canvas.addEventListener("pointerdown",this._handlePointerDown,{passive:!1})}_handleMouseEvents(){this._drawingStroke=!1,this.canvas.addEventListener("mousedown",this._handleMouseDown,{passive:!1})}_handleTouchEvents(){this.canvas.addEventListener("touchstart",this._handleTouchStart,{passive:!1})}_reset(t){this._lastPoints=[],this._lastVelocity=0,this._lastWidth=(t.minWidth+t.maxWidth)/2,this._ctx.fillStyle=t.penColor,this._ctx.globalCompositeOperation=t.compositeOperation}_createPoint(t,e,i){let n=this.canvas.getBoundingClientRect();return new b(t-n.left,e-n.top,i,new Date().getTime())}_addPoint(t,e){let{_lastPoints:i}=this;if(i.push(t),i.length>2){i.length===3&&i.unshift(i[0]);let n=this._calculateCurveWidths(i[1],i[2],e),r=g.fromPoints(i,n);return i.shift(),r}return null}_calculateCurveWidths(t,e,i){let n=i.velocityFilterWeight*e.velocityFrom(t)+(1-i.velocityFilterWeight)*this._lastVelocity,r=this._strokeWidth(n,i),l={end:r,start:this._lastWidth};return this._lastVelocity=n,this._lastWidth=r,l}_strokeWidth(t,e){return Math.max(e.maxWidth/(t+1),e.minWidth)}_drawCurveSegment(t,e,i){let n=this._ctx;n.moveTo(t,e),n.arc(t,e,i,0,2*Math.PI,!1),this._isEmpty=!1}_drawCurve(t,e){let i=this._ctx,n=t.endWidth-t.startWidth,r=Math.ceil(t.length())*2;i.beginPath(),i.fillStyle=e.penColor;for(let l=0;l<r;l+=1){let a=l/r,c=a*a,h=c*a,s=1-a,u=s*s,p=u*s,d=p*t.startPoint.x;d+=3*u*a*t.control1.x,d+=3*s*c*t.control2.x,d+=h*t.endPoint.x;let m=p*t.startPoint.y;m+=3*u*a*t.control1.y,m+=3*s*c*t.control2.y,m+=h*t.endPoint.y;let v=Math.min(t.startWidth+h*n,e.maxWidth);this._drawCurveSegment(d,m,v)}i.closePath(),i.fill()}_getDotSize(t){return t.dotSize>0?t.dotSize:(t.minWidth+t.maxWidth)/2}_drawDot(t,e){let i=this._ctx,n=this._getDotSize(e);i.beginPath(),this._drawCurveSegment(t.x,t.y,n),i.closePath(),i.fillStyle=e.penColor,i.fill()}_drawLine(t,e,i){let n=this._ctx;n.save(),n.beginPath(),n.moveTo(t.x,t.y),n.lineTo(e.x,e.y),n.lineWidth=this._getDotSize(i)*2,n.lineCap="round",n.strokeStyle=i.penColor,n.stroke(),n.restore(),this._isEmpty=!1}_fromData(t,e,i,n){for(let r of t){let{points:l}=r,a=this._getPointGroupOptions(r);if(l.length>2)for(let c=0;c<l.length;c+=1){let h=l[c],s=new b(h.x,h.y,h.pressure,h.time);c===0&&this._reset(a);let u=this._addPoint(s,a);u&&e(u,a)}else l.length===2?(this._reset(a),n(l[0],l[1],a)):(this._reset(a),i(l[0],a))}}toSVG({includeBackgroundColor:t=!1,includeDataUrl:e=!1}={}){let i=this._data,n=Math.max(window.devicePixelRatio||1,1),r=0,l=0,a=this.canvas.width/n,c=this.canvas.height/n,h=document.createElementNS("http://www.w3.org/2000/svg","svg");if(h.setAttribute("xmlns","http://www.w3.org/2000/svg"),h.setAttribute("xmlns:xlink","http://www.w3.org/1999/xlink"),h.setAttribute("viewBox",`${r} ${l} ${a} ${c}`),h.setAttribute("width",a.toString()),h.setAttribute("height",c.toString()),t&&this.backgroundColor){let s=document.createElement("rect");s.setAttribute("width","100%"),s.setAttribute("height","100%"),s.setAttribute("fill",this.backgroundColor),h.appendChild(s)}if(e&&this._dataUrl){let s=this._dataUrlOptions?.ratio||window.devicePixelRatio||1,u=this._dataUrlOptions?.width||this.canvas.width/s,p=this._dataUrlOptions?.height||this.canvas.height/s,d=this._dataUrlOptions?.xOffset||0,m=this._dataUrlOptions?.yOffset||0,v=document.createElement("image");v.setAttribute("x",d.toString()),v.setAttribute("y",m.toString()),v.setAttribute("width",u.toString()),v.setAttribute("height",p.toString()),v.setAttribute("preserveAspectRatio","none"),v.setAttribute("href",this._dataUrl),h.appendChild(v)}return this._fromData(i,(s,{penColor:u})=>{let p=document.createElement("path");if(!isNaN(s.control1.x)&&!isNaN(s.control1.y)&&!isNaN(s.control2.x)&&!isNaN(s.control2.y)){let d=`M ${s.startPoint.x.toFixed(3)},${s.startPoint.y.toFixed(3)} C ${s.control1.x.toFixed(3)},${s.control1.y.toFixed(3)} ${s.control2.x.toFixed(3)},${s.control2.y.toFixed(3)} ${s.endPoint.x.toFixed(3)},${s.endPoint.y.toFixed(3)}`;p.setAttribute("d",d),p.setAttribute("stroke-width",(s.endWidth*2.25).toFixed(3)),p.setAttribute("stroke",u),p.setAttribute("fill","none"),p.setAttribute("stroke-linecap","round"),h.appendChild(p)}},(s,{penColor:u,dotSize:p,minWidth:d,maxWidth:m})=>{let v=document.createElement("circle"),f=p>0?p:(d+m)/2;v.setAttribute("r",f.toString()),v.setAttribute("cx",s.x.toString()),v.setAttribute("cy",s.y.toString()),v.setAttribute("fill",u),h.appendChild(v)},(s,u,p)=>{let d=document.createElement("line");d.setAttribute("x1",s.x.toString()),d.setAttribute("y1",s.y.toString()),d.setAttribute("x2",u.x.toString()),d.setAttribute("y2",u.y.toString()),d.setAttribute("stroke",p.penColor),d.setAttribute("stroke-width",(this._getDotSize(p)*2).toString()),d.setAttribute("stroke-linecap","round"),h.appendChild(d)}),h.outerHTML}};export{x as default};
//# sourceMappingURL=signature_pad.min.js.map