signature_pad/dist/signature_pad.umd.min.js

Library for drawing smooth signatures.

/*!
 * Signature Pad v5.0.9 | https://github.com/szimek/signature_pad
 * (c) 2025 Szymon Nowak | Released under the MIT license
 */
!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).SignaturePad=e()}(this,(function(){"use strict";class t{constructor(t,e,i,s){if(isNaN(t)||isNaN(e))throw new Error(`Point is invalid: (${t}, ${e})`);this.x=+t,this.y=+e,this.pressure=i||0,this.time=s||Date.now()}distanceTo(t){return Math.sqrt(Math.pow(this.x-t.x,2)+Math.pow(this.y-t.y,2))}equals(t){return this.x===t.x&&this.y===t.y&&this.pressure===t.pressure&&this.time===t.time}velocityFrom(t){return this.time!==t.time?this.distanceTo(t)/(this.time-t.time):0}}class e{static fromPoints(t,i){const s=this.calculateControlPoints(t[0],t[1],t[2]).c2,n=this.calculateControlPoints(t[1],t[2],t[3]).c1;return new e(t[1],s,n,t[2],i.start,i.end)}static calculateControlPoints(e,i,s){const n=e.x-i.x,o=e.y-i.y,r=i.x-s.x,h=i.y-s.y,a=(e.x+i.x)/2,d=(e.y+i.y)/2,c=(i.x+s.x)/2,l=(i.y+s.y)/2,u=Math.sqrt(n*n+o*o),v=Math.sqrt(r*r+h*h),_=u+v==0?0:v/(u+v),p=c+(a-c)*_,m=l+(d-l)*_,g=i.x-p,w=i.y-m;return{c1:new t(a+g,d+w),c2:new t(c+g,l+w)}}constructor(t,e,i,s,n,o){this.startPoint=t,this.control2=e,this.control1=i,this.endPoint=s,this.startWidth=n,this.endWidth=o}length(){let t,e,i=0;for(let s=0;s<=10;s+=1){const n=s/10,o=this.point(n,this.startPoint.x,this.control1.x,this.control2.x,this.endPoint.x),r=this.point(n,this.startPoint.y,this.control1.y,this.control2.y,this.endPoint.y);if(s>0){const s=o-t,n=r-e;i+=Math.sqrt(s*s+n*n)}t=o,e=r}return i}point(t,e,i,s,n){return e*(1-t)*(1-t)*(1-t)+3*i*(1-t)*(1-t)*t+3*s*(1-t)*t*t+n*t*t*t}}class i{constructor(){try{this._et=new EventTarget}catch(t){this._et=document}}addEventListener(t,e,i){this._et.addEventListener(t,e,i)}dispatchEvent(t){return this._et.dispatchEvent(t)}removeEventListener(t,e,i){this._et.removeEventListener(t,e,i)}}class s extends i{constructor(t,e={}){var i,n,o;super(),this.canvas=t,this._drawingStroke=!1,this._isEmpty=!0,this._lastPoints=[],this._data=[],this._lastVelocity=0,this._lastWidth=0,this._handleMouseDown=t=>{this._isLeftButtonPressed(t,!0)&&!this._drawingStroke&&this._strokeBegin(this._pointerEventToSignatureEvent(t))},this._handleMouseMove=t=>{this._isLeftButtonPressed(t,!0)&&this._drawingStroke?this._strokeMoveUpdate(this._pointerEventToSignatureEvent(t)):this._strokeEnd(this._pointerEventToSignatureEvent(t),!1)},this._handleMouseUp=t=>{this._isLeftButtonPressed(t)||this._strokeEnd(this._pointerEventToSignatureEvent(t))},this._handleTouchStart=t=>{1!==t.targetTouches.length||this._drawingStroke||(t.cancelable&&t.preventDefault(),this._strokeBegin(this._touchEventToSignatureEvent(t)))},this._handleTouchMove=t=>{1===t.targetTouches.length&&(t.cancelable&&t.preventDefault(),this._drawingStroke?this._strokeMoveUpdate(this._touchEventToSignatureEvent(t)):this._strokeEnd(this._touchEventToSignatureEvent(t),!1))},this._handleTouchEnd=t=>{0===t.targetTouches.length&&(t.cancelable&&t.preventDefault(),this._strokeEnd(this._touchEventToSignatureEvent(t)))},this._handlePointerDown=t=>{!t.isPrimary||!this._isLeftButtonPressed(t)||this._drawingStroke||void 0!==this._strokePointerId&&this._strokePointerId!==this._getPointerId(t)||(this._strokePointerId=this._getPointerId(t),t.preventDefault(),this._strokeBegin(this._pointerEventToSignatureEvent(t)))},this._handlePointerMove=t=>{t.isPrimary&&this._strokePointerId===this._getPointerId(t)&&(this._isLeftButtonPressed(t,!0)&&this._drawingStroke?(t.preventDefault(),this._strokeMoveUpdate(this._pointerEventToSignatureEvent(t))):this._strokeEnd(this._pointerEventToSignatureEvent(t),!1))},this._handlePointerUp=t=>{t.isPrimary&&!this._isLeftButtonPressed(t)&&this._strokePointerId===this._getPointerId(t)&&(this._strokePointerId=void 0,t.preventDefault(),this._strokeEnd(this._pointerEventToSignatureEvent(t)))},this.velocityFilterWeight=e.velocityFilterWeight||.7,this.minWidth=e.minWidth||.5,this.maxWidth=e.maxWidth||2.5,this.throttle=null!==(i=e.throttle)&&void 0!==i?i:16,this.minDistance=null!==(n=e.minDistance)&&void 0!==n?n: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=null!==(o=e.canvasContextOptions)&&void 0!==o?o:{},this._strokeMoveUpdate=this.throttle?function(t,e=250){let i,s,n,o=0,r=null;const h=()=>{o=Date.now(),r=null,i=t.apply(s,n),r||(s=null,n=[])};return function(...a){const d=Date.now(),c=e-(d-o);return s=this,n=a,c<=0||c>e?(r&&(clearTimeout(r),r=null),o=d,i=t.apply(s,n),r||(s=null,n=[])):r||(r=window.setTimeout(h,c)),i}}(s.prototype._strokeUpdate,this.throttle):s.prototype._strokeUpdate,this._ctx=t.getContext("2d",this.canvasContextOptions),this.clear(),this.on()}clear(){const{_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}fromDataURL(t,e={}){return new Promise(((i,s)=>{const n=new Image,o=e.ratio||window.devicePixelRatio||1,r=e.width||this.canvas.width/o,h=e.height||this.canvas.height/o,a=e.xOffset||0,d=e.yOffset||0;this._reset(this._getPointGroupOptions()),n.onload=()=>{this._ctx.drawImage(n,a,d,r,h),i()},n.onerror=t=>{s(t)},n.crossOrigin="anonymous",n.src=t,this._isEmpty=!1}))}toDataURL(t="image/png",e){return"image/svg+xml"===t?("object"!=typeof e&&(e=void 0),`data:image/svg+xml;base64,${btoa(this.toSVG(e))}`):("number"!=typeof e&&(e=void 0),this.canvas.toDataURL(t,e))}on(){this.canvas.style.touchAction="none",this.canvas.style.msTouchAction="none",this.canvas.style.userSelect="none";const 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.removeEventListener("pointerdown",this._handlePointerDown),this.canvas.removeEventListener("mousedown",this._handleMouseDown),this.canvas.removeEventListener("touchstart",this._handleTouchStart),this._removeMoveUpEventListeners()}_getListenerFunctions(){var t;const e=window.document===this.canvas.ownerDocument?window:null!==(t=this.canvas.ownerDocument.defaultView)&&void 0!==t?t:this.canvas.ownerDocument;return{addEventListener:e.addEventListener.bind(e),removeEventListener:e.removeEventListener.bind(e)}}_removeMoveUpEventListeners(){const{removeEventListener:t}=this._getListenerFunctions();t("pointermove",this._handlePointerMove),t("pointerup",this._handlePointerUp),t("mousemove",this._handleMouseMove),t("mouseup",this._handleMouseUp),t("touchmove",this._handleTouchMove),t("touchend",this._handleTouchEnd)}isEmpty(){return this._isEmpty}fromData(t,{clear:e=!0}={}){e&&this.clear(),this._fromData(t,this._drawCurve.bind(this),this._drawDot.bind(this)),this._data=this._data.concat(t)}toData(){return this._data}_isLeftButtonPressed(t,e){return e?1===t.buttons:!(1&~t.buttons)}_pointerEventToSignatureEvent(t){return{event:t,type:t.type,x:t.clientX,y:t.clientY,pressure:"pressure"in t?t.pressure:0}}_touchEventToSignatureEvent(t){const e=t.changedTouches[0];return{event:t,type:t.type,x:e.clientX,y:e.clientY,pressure:e.force}}_getPointerId(t){return t.persistentDeviceId||t.pointerId}_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;const{addEventListener:e}=this._getListenerFunctions();switch(t.event.type){case"mousedown":e("mousemove",this._handleMouseMove,{passive:!1}),e("mouseup",this._handleMouseUp,{passive:!1});break;case"touchstart":e("touchmove",this._handleTouchMove,{passive:!1}),e("touchend",this._handleTouchEnd,{passive:!1});break;case"pointerdown":e("pointermove",this._handlePointerMove,{passive:!1}),e("pointerup",this._handlePointerUp,{passive:!1})}this._drawingStroke=!0;const i=this._getPointGroupOptions(),s=Object.assign(Object.assign({},i),{points:[]});this._data.push(s),this._reset(i),this._strokeUpdate(t)}_strokeUpdate(t){if(!this._drawingStroke)return;if(0===this._data.length)return void this._strokeBegin(t);this.dispatchEvent(new CustomEvent("beforeUpdateStroke",{detail:t}));const e=this._createPoint(t.x,t.y,t.pressure),i=this._data[this._data.length-1],s=i.points,n=s.length>0&&s[s.length-1],o=!!n&&e.distanceTo(n)<=this.minDistance,r=this._getPointGroupOptions(i);if(!n||!n||!o){const t=this._addPoint(e,r);n?t&&this._drawCurve(t,r):this._drawDot(e,r),s.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.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(e,i,s){const n=this.canvas.getBoundingClientRect();return new t(e-n.left,i-n.top,s,(new Date).getTime())}_addPoint(t,i){const{_lastPoints:s}=this;if(s.push(t),s.length>2){3===s.length&&s.unshift(s[0]);const t=this._calculateCurveWidths(s[1],s[2],i),n=e.fromPoints(s,t);return s.shift(),n}return null}_calculateCurveWidths(t,e,i){const s=i.velocityFilterWeight*e.velocityFrom(t)+(1-i.velocityFilterWeight)*this._lastVelocity,n=this._strokeWidth(s,i),o={end:n,start:this._lastWidth};return this._lastVelocity=s,this._lastWidth=n,o}_strokeWidth(t,e){return Math.max(e.maxWidth/(t+1),e.minWidth)}_drawCurveSegment(t,e,i){const s=this._ctx;s.moveTo(t,e),s.arc(t,e,i,0,2*Math.PI,!1),this._isEmpty=!1}_drawCurve(t,e){const i=this._ctx,s=t.endWidth-t.startWidth,n=2*Math.ceil(t.length());i.beginPath(),i.fillStyle=e.penColor;for(let i=0;i<n;i+=1){const o=i/n,r=o*o,h=r*o,a=1-o,d=a*a,c=d*a;let l=c*t.startPoint.x;l+=3*d*o*t.control1.x,l+=3*a*r*t.control2.x,l+=h*t.endPoint.x;let u=c*t.startPoint.y;u+=3*d*o*t.control1.y,u+=3*a*r*t.control2.y,u+=h*t.endPoint.y;const v=Math.min(t.startWidth+h*s,e.maxWidth);this._drawCurveSegment(l,u,v)}i.closePath(),i.fill()}_drawDot(t,e){const i=this._ctx,s=e.dotSize>0?e.dotSize:(e.minWidth+e.maxWidth)/2;i.beginPath(),this._drawCurveSegment(t.x,t.y,s),i.closePath(),i.fillStyle=e.penColor,i.fill()}_fromData(e,i,s){for(const n of e){const{points:e}=n,o=this._getPointGroupOptions(n);if(e.length>1)for(let s=0;s<e.length;s+=1){const n=e[s],r=new t(n.x,n.y,n.pressure,n.time);0===s&&this._reset(o);const h=this._addPoint(r,o);h&&i(h,o)}else this._reset(o),s(e[0],o)}}toSVG({includeBackgroundColor:t=!1}={}){const e=this._data,i=Math.max(window.devicePixelRatio||1,1),s=this.canvas.width/i,n=this.canvas.height/i,o=document.createElementNS("http://www.w3.org/2000/svg","svg");if(o.setAttribute("xmlns","http://www.w3.org/2000/svg"),o.setAttribute("xmlns:xlink","http://www.w3.org/1999/xlink"),o.setAttribute("viewBox",`0 0 ${s} ${n}`),o.setAttribute("width",s.toString()),o.setAttribute("height",n.toString()),t&&this.backgroundColor){const t=document.createElement("rect");t.setAttribute("width","100%"),t.setAttribute("height","100%"),t.setAttribute("fill",this.backgroundColor),o.appendChild(t)}return this._fromData(e,((t,{penColor:e})=>{const i=document.createElement("path");if(!(isNaN(t.control1.x)||isNaN(t.control1.y)||isNaN(t.control2.x)||isNaN(t.control2.y))){const s=`M ${t.startPoint.x.toFixed(3)},${t.startPoint.y.toFixed(3)} C ${t.control1.x.toFixed(3)},${t.control1.y.toFixed(3)} ${t.control2.x.toFixed(3)},${t.control2.y.toFixed(3)} ${t.endPoint.x.toFixed(3)},${t.endPoint.y.toFixed(3)}`;i.setAttribute("d",s),i.setAttribute("stroke-width",(2.25*t.endWidth).toFixed(3)),i.setAttribute("stroke",e),i.setAttribute("fill","none"),i.setAttribute("stroke-linecap","round"),o.appendChild(i)}}),((t,{penColor:e,dotSize:i,minWidth:s,maxWidth:n})=>{const r=document.createElement("circle"),h=i>0?i:(s+n)/2;r.setAttribute("r",h.toString()),r.setAttribute("cx",t.x.toString()),r.setAttribute("cy",t.y.toString()),r.setAttribute("fill",e),o.appendChild(r)})),o.outerHTML}}return s}));
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