signature_pad/docs/js/signature_pad.umd.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
 */
(function(g,f){if(typeof exports=="object"&&typeof module<"u"){module.exports=f()}else if("function"==typeof define && define.amd){define("SignaturePad",f)}else {g["SignaturePad"]=f()}}(typeof globalThis < "u" ? globalThis : typeof self < "u" ? self : this,function(){var exports={};var __exports=exports;var module={exports};
var y=Object.defineProperty;var M=Object.getOwnPropertyDescriptor;var U=Object.getOwnPropertyNames;var W=Object.prototype.hasOwnProperty;var f=(u,n,t)=>()=>{if(t)throw t[0];try{return u&&(n=u(u=0)),n}catch(e){throw t=[e],e}};var L=(u,n)=>{for(var t in n)y(u,t,{get:n[t],enumerable:!0})},A=(u,n,t,e)=>{if(n&&typeof n=="object"||typeof n=="function")for(let i of U(n))!W.call(u,i)&&i!==t&&y(u,i,{get:()=>n[i],enumerable:!(e=M(n,i))||e.enumerable});return u};var G=u=>A(y({},"__esModule",{value:!0}),u);var b,P=f(()=>{"use strict";b=class{x;y;pressure;time;constructor(n,t,e,i){if(isNaN(n)||isNaN(t))throw new Error(`Point is invalid: (${n}, ${t})`);this.x=+n,this.y=+t,this.pressure=e||0,this.time=i||Date.now()}distanceTo(n){return Math.sqrt(Math.pow(this.x-n.x,2)+Math.pow(this.y-n.y,2))}equals(n){return this.x===n.x&&this.y===n.y&&this.pressure===n.pressure&&this.time===n.time}velocityFrom(n){return this.time!==n.time?this.distanceTo(n)/(this.time-n.time):0}}});var x,S=f(()=>{"use strict";P();x=class u{constructor(n,t,e,i,o,r){this.startPoint=n;this.control2=t;this.control1=e;this.endPoint=i;this.startWidth=o;this.endWidth=r}startPoint;control2;control1;endPoint;startWidth;endWidth;static fromPoints(n,t){let e=this.calculateControlPoints(n[0],n[1],n[2]).c2,i=this.calculateControlPoints(n[1],n[2],n[3]).c1;return new u(n[1],e,i,n[2],t.start,t.end)}static calculateControlPoints(n,t,e){let i=n.x-t.x,o=n.y-t.y,r=t.x-e.x,l=t.y-e.y,a={x:(n.x+t.x)/2,y:(n.y+t.y)/2},c={x:(t.x+e.x)/2,y:(t.y+e.y)/2},h=Math.sqrt(i*i+o*o),s=Math.sqrt(r*r+l*l),p=a.x-c.x,v=a.y-c.y,d=h+s==0?0:s/(h+s),_={x:c.x+p*d,y:c.y+v*d},m=t.x-_.x,g=t.y-_.y;return{c1:new b(a.x+m,a.y+g),c2:new b(c.x+m,c.y+g)}}length(){let t=0,e,i;for(let o=0;o<=10;o+=1){let r=o/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(o>0){let c=l-e,h=a-i;t+=Math.sqrt(c*c+h*h)}e=l,i=a}return t}point(n,t,e,i,o){return t*(1-n)*(1-n)*(1-n)+3*e*(1-n)*(1-n)*n+3*i*(1-n)*n*n+o*n*n*n}}});var w,C=f(()=>{"use strict";w=class{_et;constructor(){try{this._et=new EventTarget}catch{this._et=document}}addEventListener(n,t,e){this._et.addEventListener(n,t,e)}dispatchEvent(n){return this._et.dispatchEvent(n)}removeEventListener(n,t,e){this._et.removeEventListener(n,t,e)}}});function O(u,n=250){let t=0,e=null,i,o,r,l=()=>{t=Date.now(),e=null,i=u.apply(o,r),e||(o=null,r=[])};return function(...c){let h=Date.now(),s=n-(h-t);return o=this,r=c,s<=0||s>n?(e&&(clearTimeout(e),e=null),t=h,i=u.apply(o,r),e||(o=null,r=[])):e||(e=window.setTimeout(l,s)),i}}var k=f(()=>{"use strict"});var T={};L(T,{default:()=>E});var E,D=f(()=>{"use strict";S();P();C();k();P();E=class u extends w{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?O(u.prototype._strokeUpdate,this.throttle):u.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,o)=>{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=p=>{o(p)},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 o=this._getPointGroupOptions(),r={...o,points:[]};this._data.push(r),this._reset(o),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],o=i.points,r=o.length>0&&o[o.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),o.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 o=this.canvas.getBoundingClientRect();return new b(t-o.left,e-o.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 o=this._calculateCurveWidths(i[1],i[2],e),r=x.fromPoints(i,o);return i.shift(),r}return null}_calculateCurveWidths(t,e,i){let o=i.velocityFilterWeight*e.velocityFrom(t)+(1-i.velocityFilterWeight)*this._lastVelocity,r=this._strokeWidth(o,i),l={end:r,start:this._lastWidth};return this._lastVelocity=o,this._lastWidth=r,l}_strokeWidth(t,e){return Math.max(e.maxWidth/(t+1),e.minWidth)}_drawCurveSegment(t,e,i){let o=this._ctx;o.moveTo(t,e),o.arc(t,e,i,0,2*Math.PI,!1),this._isEmpty=!1}_drawCurve(t,e){let i=this._ctx,o=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,p=s*s,v=p*s,d=v*t.startPoint.x;d+=3*p*a*t.control1.x,d+=3*s*c*t.control2.x,d+=h*t.endPoint.x;let _=v*t.startPoint.y;_+=3*p*a*t.control1.y,_+=3*s*c*t.control2.y,_+=h*t.endPoint.y;let m=Math.min(t.startWidth+h*o,e.maxWidth);this._drawCurveSegment(d,_,m)}i.closePath(),i.fill()}_getDotSize(t){return t.dotSize>0?t.dotSize:(t.minWidth+t.maxWidth)/2}_drawDot(t,e){let i=this._ctx,o=this._getDotSize(e);i.beginPath(),this._drawCurveSegment(t.x,t.y,o),i.closePath(),i.fillStyle=e.penColor,i.fill()}_drawLine(t,e,i){let o=this._ctx;o.save(),o.beginPath(),o.moveTo(t.x,t.y),o.lineTo(e.x,e.y),o.lineWidth=this._getDotSize(i)*2,o.lineCap="round",o.strokeStyle=i.penColor,o.stroke(),o.restore(),this._isEmpty=!1}_fromData(t,e,i,o){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 p=this._addPoint(s,a);p&&e(p,a)}else l.length===2?(this._reset(a),o(l[0],l[1],a)):(this._reset(a),i(l[0],a))}}toSVG({includeBackgroundColor:t=!1,includeDataUrl:e=!1}={}){let i=this._data,o=Math.max(window.devicePixelRatio||1,1),r=0,l=0,a=this.canvas.width/o,c=this.canvas.height/o,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,p=this._dataUrlOptions?.width||this.canvas.width/s,v=this._dataUrlOptions?.height||this.canvas.height/s,d=this._dataUrlOptions?.xOffset||0,_=this._dataUrlOptions?.yOffset||0,m=document.createElement("image");m.setAttribute("x",d.toString()),m.setAttribute("y",_.toString()),m.setAttribute("width",p.toString()),m.setAttribute("height",v.toString()),m.setAttribute("preserveAspectRatio","none"),m.setAttribute("href",this._dataUrl),h.appendChild(m)}return this._fromData(i,(s,{penColor:p})=>{let v=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)}`;v.setAttribute("d",d),v.setAttribute("stroke-width",(s.endWidth*2.25).toFixed(3)),v.setAttribute("stroke",p),v.setAttribute("fill","none"),v.setAttribute("stroke-linecap","round"),h.appendChild(v)}},(s,{penColor:p,dotSize:v,minWidth:d,maxWidth:_})=>{let m=document.createElement("circle"),g=v>0?v:(d+_)/2;m.setAttribute("r",g.toString()),m.setAttribute("cx",s.x.toString()),m.setAttribute("cy",s.y.toString()),m.setAttribute("fill",p),h.appendChild(m)},(s,p,v)=>{let d=document.createElement("line");d.setAttribute("x1",s.x.toString()),d.setAttribute("y1",s.y.toString()),d.setAttribute("x2",p.x.toString()),d.setAttribute("y2",p.y.toString()),d.setAttribute("stroke",v.penColor),d.setAttribute("stroke-width",(this._getDotSize(v)*2).toString()),d.setAttribute("stroke-linecap","round"),h.appendChild(d)}),h.outerHTML}}});module.exports=(D(),G(T)).default;

if(__exports != exports)module.exports = exports;return module.exports}));
//# sourceMappingURL=signature_pad.umd.min.js.map