From 29a8b5a2a19387782c3eec1055389011eb7f9699 Mon Sep 17 00:00:00 2001 From: Tony Brix Date: Thu, 4 Apr 2024 19:25:48 -0600 Subject: [PATCH] fix: allow drawing outside canvas for a smoother signature (#765) BREAKING CHANGE: - Drawing outside of the canvas will record data outside the canvas - Update SignatureEvent to store the original event, x, y, pressure - move and up events are attached once down is triggered and they are on the window/ownerDocument target --- docs/css/signature-pad.css | 5 + docs/index.html | 6 +- docs/js/app.js | 19 +++ docs/js/signature_pad.umd.min.js | 2 +- docs/js/signature_pad.umd.min.js.map | 2 +- src/signature_pad.ts | 226 +++++++++++++++++++-------- tests/signature_pad.test.ts | 72 ++++++--- 7 files changed, 245 insertions(+), 87 deletions(-) diff --git a/docs/css/signature-pad.css b/docs/css/signature-pad.css index 23f6e573..555c2e4f 100644 --- a/docs/css/signature-pad.css +++ b/docs/css/signature-pad.css @@ -78,6 +78,11 @@ body { -ms-flex: 1; flex: 1; border: 1px solid #f4f4f4; + border-radius: 4px; +} + +.signature-pad--body.empty { + background-color: #333; } .signature-pad--body canvas { diff --git a/docs/index.html b/docs/index.html index 3f715310..9bca6edb 100644 --- a/docs/index.html +++ b/docs/index.html @@ -34,7 +34,7 @@
-
+
@@ -59,6 +59,10 @@ background
+ +
+ +
diff --git a/docs/js/app.js b/docs/js/app.js index 8bdf6c97..fbcd098c 100644 --- a/docs/js/app.js +++ b/docs/js/app.js @@ -1,4 +1,5 @@ const wrapper = document.getElementById("signature-pad"); +const canvasWrapper = document.getElementById("canvas-wrapper"); const clearButton = wrapper.querySelector("[data-action=clear]"); const changeBackgroundColorButton = wrapper.querySelector("[data-action=change-background-color]"); const changeColorButton = wrapper.querySelector("[data-action=change-color]"); @@ -9,6 +10,7 @@ const savePNGButton = wrapper.querySelector("[data-action=save-png]"); const saveJPGButton = wrapper.querySelector("[data-action=save-jpg]"); const saveSVGButton = wrapper.querySelector("[data-action=save-svg]"); const saveSVGWithBackgroundButton = wrapper.querySelector("[data-action=save-svg-with-background]"); +const openInWindowButton = wrapper.querySelector("[data-action=open-in-window]"); let undoData = []; const canvas = wrapper.querySelector("canvas"); const signaturePad = new SignaturePad(canvas, { @@ -182,3 +184,20 @@ saveSVGWithBackgroundButton.addEventListener("click", () => { download(dataURL, "signature.svg"); } }); + +openInWindowButton.addEventListener("click", () => { + var externalWin = window.open('', '', `width=${canvas.width / window.devicePixelRatio},height=${canvas.height / window.devicePixelRatio}`); + canvas.style.width = "100%"; + canvas.style.height = "100%"; + externalWin.onresize = resizeCanvas; + externalWin.document.body.style.margin = '0'; + externalWin.document.body.appendChild(canvas); + canvasWrapper.classList.add("empty"); + externalWin.onbeforeunload = () => { + canvas.style.width = ""; + canvas.style.height = ""; + canvasWrapper.classList.remove("empty"); + canvasWrapper.appendChild(canvas); + resizeCanvas(); + }; +}) diff --git a/docs/js/signature_pad.umd.min.js b/docs/js/signature_pad.umd.min.js index c776cdac..1d786514 100644 --- a/docs/js/signature_pad.umd.min.js +++ b/docs/js/signature_pad.umd.min.js @@ -2,5 +2,5 @@ * Signature Pad v4.2.0 | https://github.com/szimek/signature_pad * (c) 2024 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,h=i.x-s.x,r=i.y-s.y,a=(e.x+i.x)/2,c=(e.y+i.y)/2,d=(i.x+s.x)/2,l=(i.y+s.y)/2,u=Math.sqrt(n*n+o*o),v=Math.sqrt(h*h+r*r),p=v/(u+v),_=d+(a-d)*p,m=l+(c-l)*p,g=i.x-_,x=i.y-m;return{c1:new t(a+g,c+x),c2:new t(d+g,l+x)}}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),h=this.point(n,this.startPoint.y,this.control1.y,this.control2.y,this.endPoint.y);if(s>0){const s=o-t,n=h-e;i+=Math.sqrt(s*s+n*n)}t=o,e=h}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={}){super(),this.canvas=t,this._drawingStroke=!1,this._isEmpty=!0,this._lastPoints=[],this._data=[],this._lastVelocity=0,this._lastWidth=0,this._handleMouseDown=t=>{1===t.buttons&&this._strokeBegin(t)},this._handleMouseMove=t=>{this._strokeMoveUpdate(t)},this._handleMouseUp=t=>{1===t.buttons&&this._strokeEnd(t)},this._handleTouchStart=t=>{if(t.cancelable&&t.preventDefault(),1===t.targetTouches.length){const e=t.changedTouches[0];this._strokeBegin(e)}},this._handleTouchMove=t=>{t.cancelable&&t.preventDefault();const e=t.targetTouches[0];this._strokeMoveUpdate(e)},this._handleTouchEnd=t=>{if(t.target===this.canvas){t.cancelable&&t.preventDefault();const e=t.changedTouches[0];this._strokeEnd(e)}},this._handlePointerStart=t=>{t.preventDefault(),this._strokeBegin(t)},this._handlePointerMove=t=>{this._strokeMoveUpdate(t)},this._handlePointerEnd=t=>{this._drawingStroke&&(t.preventDefault(),this._strokeEnd(t))},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.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="canvasContextOptions"in e?e.canvasContextOptions:{},this._strokeMoveUpdate=this.throttle?function(t,e=250){let i,s,n,o=0,h=null;const r=()=>{o=Date.now(),h=null,i=t.apply(s,n),h||(s=null,n=[])};return function(...a){const c=Date.now(),d=e-(c-o);return s=this,n=a,d<=0||d>e?(h&&(clearTimeout(h),h=null),o=c,i=t.apply(s,n),h||(s=null,n=[])):h||(h=window.setTimeout(r,d)),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,h=e.width||this.canvas.width/o,r=e.height||this.canvas.height/o,a=e.xOffset||0,c=e.yOffset||0;this._reset(this._getPointGroupOptions()),n.onload=()=>{this._ctx.drawImage(n,a,c,h,r),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._handlePointerStart),this.canvas.removeEventListener("pointermove",this._handlePointerMove),this.canvas.ownerDocument.removeEventListener("pointerup",this._handlePointerEnd),this.canvas.removeEventListener("mousedown",this._handleMouseDown),this.canvas.removeEventListener("mousemove",this._handleMouseMove),this.canvas.ownerDocument.removeEventListener("mouseup",this._handleMouseUp),this.canvas.removeEventListener("touchstart",this._handleTouchStart),this.canvas.removeEventListener("touchmove",this._handleTouchMove),this.canvas.removeEventListener("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}_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;this._drawingStroke=!0;const e=this._getPointGroupOptions(),i=Object.assign(Object.assign({},e),{points:[]});this._data.push(i),this._reset(e),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=t.clientX,i=t.clientY,s=void 0!==t.pressure?t.pressure:void 0!==t.force?t.force:0,n=this._createPoint(e,i,s),o=this._data[this._data.length-1],h=o.points,r=h.length>0&&h[h.length-1],a=!!r&&n.distanceTo(r)<=this.minDistance,c=this._getPointGroupOptions(o);if(!r||!r||!a){const t=this._addPoint(n,c);r?t&&this._drawCurve(t,c):this._drawDot(n,c),h.push({time:n.time,x:n.x,y:n.y,pressure:n.pressure})}this.dispatchEvent(new CustomEvent("afterUpdateStroke",{detail:t}))}_strokeEnd(t){this._drawingStroke&&(this._strokeUpdate(t),this._drawingStroke=!1,this.dispatchEvent(new CustomEvent("endStroke",{detail:t})))}_handlePointerEvents(){this._drawingStroke=!1,this.canvas.addEventListener("pointerdown",this._handlePointerStart),this.canvas.addEventListener("pointermove",this._handlePointerMove),this.canvas.ownerDocument.addEventListener("pointerup",this._handlePointerEnd)}_handleMouseEvents(){this._drawingStroke=!1,this.canvas.addEventListener("mousedown",this._handleMouseDown),this.canvas.addEventListener("mousemove",this._handleMouseMove),this.canvas.ownerDocument.addEventListener("mouseup",this._handleMouseUp)}_handleTouchEvents(){this.canvas.addEventListener("touchstart",this._handleTouchStart),this.canvas.addEventListener("touchmove",this._handleTouchMove),this.canvas.addEventListener("touchend",this._handleTouchEnd)}_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;i0?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{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 h=document.createElement("circle"),r=i>0?i:(s+n)/2;h.setAttribute("r",r.toString()),h.setAttribute("cx",t.x.toString()),h.setAttribute("cy",t.y.toString()),h.setAttribute("fill",e),o.appendChild(h)})),o.outerHTML}}return s})); +!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,n){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=n||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 n=this.calculateControlPoints(t[0],t[1],t[2]).c2,s=this.calculateControlPoints(t[1],t[2],t[3]).c1;return new e(t[1],n,s,t[2],i.start,i.end)}static calculateControlPoints(e,i,n){const s=e.x-i.x,o=e.y-i.y,r=i.x-n.x,h=i.y-n.y,a=(e.x+i.x)/2,c=(e.y+i.y)/2,d=(i.x+n.x)/2,l=(i.y+n.y)/2,u=Math.sqrt(s*s+o*o),v=Math.sqrt(r*r+h*h),_=v/(u+v),p=d+(a-d)*_,m=l+(c-l)*_,g=i.x-p,w=i.y-m;return{c1:new t(a+g,c+w),c2:new t(d+g,l+w)}}constructor(t,e,i,n,s,o){this.startPoint=t,this.control2=e,this.control1=i,this.endPoint=n,this.startWidth=s,this.endWidth=o}length(){let t,e,i=0;for(let n=0;n<=10;n+=1){const s=n/10,o=this.point(s,this.startPoint.x,this.control1.x,this.control2.x,this.endPoint.x),r=this.point(s,this.startPoint.y,this.control1.y,this.control2.y,this.endPoint.y);if(n>0){const n=o-t,s=r-e;i+=Math.sqrt(n*n+s*s)}t=o,e=r}return i}point(t,e,i,n,s){return e*(1-t)*(1-t)*(1-t)+3*i*(1-t)*(1-t)*t+3*n*(1-t)*t*t+s*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 n extends i{constructor(t,e={}){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.canvas.removeEventListener("touchmove",this._handleTouchMove),this._strokeEnd(this._touchEventToSignatureEvent(t)))},this._handlePointerDown=t=>{this._isLeftButtonPressed(t)&&!this._drawingStroke&&(t.preventDefault(),this._strokeBegin(this._pointerEventToSignatureEvent(t)))},this._handlePointerMove=t=>{this._isLeftButtonPressed(t,!0)&&this._drawingStroke?(t.preventDefault(),this._strokeMoveUpdate(this._pointerEventToSignatureEvent(t))):this._strokeEnd(this._pointerEventToSignatureEvent(t),!1)},this._handlePointerUp=t=>{this._isLeftButtonPressed(t)||(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="throttle"in e?e.throttle:16,this.minDistance="minDistance"in e?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="canvasContextOptions"in e?e.canvasContextOptions:{},this._strokeMoveUpdate=this.throttle?function(t,e=250){let i,n,s,o=0,r=null;const h=()=>{o=Date.now(),r=null,i=t.apply(n,s),r||(n=null,s=[])};return function(...a){const c=Date.now(),d=e-(c-o);return n=this,s=a,d<=0||d>e?(r&&(clearTimeout(r),r=null),o=c,i=t.apply(n,s),r||(n=null,s=[])):r||(r=window.setTimeout(h,d)),i}}(n.prototype._strokeUpdate,this.throttle):n.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,n)=>{const s=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,c=e.yOffset||0;this._reset(this._getPointGroupOptions()),s.onload=()=>{this._ctx.drawImage(s,a,c,r,h),i()},s.onerror=t=>{n(t)},s.crossOrigin="anonymous",s.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}}_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),e("mouseup",this._handleMouseUp);break;case"touchstart":e("touchmove",this._handleTouchMove),e("touchend",this._handleTouchEnd);break;case"pointerdown":e("pointermove",this._handlePointerMove),e("pointerup",this._handlePointerUp)}this._drawingStroke=!0;const i=this._getPointGroupOptions(),n=Object.assign(Object.assign({},i),{points:[]});this._data.push(n),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],n=i.points,s=n.length>0&&n[n.length-1],o=!!s&&e.distanceTo(s)<=this.minDistance,r=this._getPointGroupOptions(i);if(!s||!s||!o){const t=this._addPoint(e,r);s?t&&this._drawCurve(t,r):this._drawDot(e,r),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.dispatchEvent(new CustomEvent("endStroke",{detail:t})))}_handlePointerEvents(){this._drawingStroke=!1,this.canvas.addEventListener("pointerdown",this._handlePointerDown)}_handleMouseEvents(){this._drawingStroke=!1,this.canvas.addEventListener("mousedown",this._handleMouseDown)}_handleTouchEvents(){this.canvas.addEventListener("touchstart",this._handleTouchStart)}_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,n){const s=this.canvas.getBoundingClientRect();return new t(e-s.left,i-s.top,n,(new Date).getTime())}_addPoint(t,i){const{_lastPoints:n}=this;if(n.push(t),n.length>2){3===n.length&&n.unshift(n[0]);const t=this._calculateCurveWidths(n[1],n[2],i),s=e.fromPoints(n,t);return n.shift(),s}return null}_calculateCurveWidths(t,e,i){const n=i.velocityFilterWeight*e.velocityFrom(t)+(1-i.velocityFilterWeight)*this._lastVelocity,s=this._strokeWidth(n,i),o={end:s,start:this._lastWidth};return this._lastVelocity=n,this._lastWidth=s,o}_strokeWidth(t,e){return Math.max(e.maxWidth/(t+1),e.minWidth)}_drawCurveSegment(t,e,i){const n=this._ctx;n.moveTo(t,e),n.arc(t,e,i,0,2*Math.PI,!1),this._isEmpty=!1}_drawCurve(t,e){const i=this._ctx,n=t.endWidth-t.startWidth,s=2*Math.ceil(t.length());i.beginPath(),i.fillStyle=e.penColor;for(let i=0;i0?e.dotSize:(e.minWidth+e.maxWidth)/2;i.beginPath(),this._drawCurveSegment(t.x,t.y,n),i.closePath(),i.fillStyle=e.penColor,i.fill()}_fromData(e,i,n){for(const s of e){const{points:e}=s,o=this._getPointGroupOptions(s);if(e.length>1)for(let n=0;n{const i=document.createElement("path");if(!(isNaN(t.control1.x)||isNaN(t.control1.y)||isNaN(t.control2.x)||isNaN(t.control2.y))){const n=`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",n),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:n,maxWidth:s})=>{const r=document.createElement("circle"),h=i>0?i:(n+s)/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 n})); //# sourceMappingURL=signature_pad.umd.min.js.map diff --git a/docs/js/signature_pad.umd.min.js.map b/docs/js/signature_pad.umd.min.js.map index 77f34d50..629de735 100644 --- a/docs/js/signature_pad.umd.min.js.map +++ b/docs/js/signature_pad.umd.min.js.map @@ -1 +1 @@ -{"version":3,"file":"signature_pad.umd.min.js","sources":["../src/point.ts","../src/bezier.ts","../src/signature_event_target.ts","../src/signature_pad.ts","../src/throttle.ts"],"sourcesContent":["// Interface for point data structure used e.g. in SignaturePad#fromData method\nexport interface BasicPoint {\n x: number;\n y: number;\n pressure: number;\n time: number;\n}\n\nexport class Point implements BasicPoint {\n public x: number;\n public y: number;\n public pressure: number;\n public time: number;\n\n constructor(x: number, y: number, pressure?: number, time?: number) {\n if (isNaN(x) || isNaN(y)) {\n throw new Error(`Point is invalid: (${x}, ${y})`);\n }\n this.x = +x;\n this.y = +y;\n this.pressure = pressure || 0;\n this.time = time || Date.now();\n }\n\n public distanceTo(start: BasicPoint): number {\n return Math.sqrt(\n Math.pow(this.x - start.x, 2) + Math.pow(this.y - start.y, 2),\n );\n }\n\n public equals(other: BasicPoint): boolean {\n return (\n this.x === other.x &&\n this.y === other.y &&\n this.pressure === other.pressure &&\n this.time === other.time\n );\n }\n\n public velocityFrom(start: BasicPoint): number {\n return this.time !== start.time\n ? this.distanceTo(start) / (this.time - start.time)\n : 0;\n }\n}\n","import { BasicPoint, Point } from './point';\n\nexport class Bezier {\n public static fromPoints(\n points: Point[],\n widths: { start: number; end: number },\n ): Bezier {\n const c2 = this.calculateControlPoints(points[0], points[1], points[2]).c2;\n const c3 = this.calculateControlPoints(points[1], points[2], points[3]).c1;\n\n return new Bezier(points[1], c2, c3, points[2], widths.start, widths.end);\n }\n\n private static calculateControlPoints(\n s1: BasicPoint,\n s2: BasicPoint,\n s3: BasicPoint,\n ): {\n c1: BasicPoint;\n c2: BasicPoint;\n } {\n const dx1 = s1.x - s2.x;\n const dy1 = s1.y - s2.y;\n const dx2 = s2.x - s3.x;\n const dy2 = s2.y - s3.y;\n\n const m1 = { x: (s1.x + s2.x) / 2.0, y: (s1.y + s2.y) / 2.0 };\n const m2 = { x: (s2.x + s3.x) / 2.0, y: (s2.y + s3.y) / 2.0 };\n\n const l1 = Math.sqrt(dx1 * dx1 + dy1 * dy1);\n const l2 = Math.sqrt(dx2 * dx2 + dy2 * dy2);\n\n const dxm = m1.x - m2.x;\n const dym = m1.y - m2.y;\n\n const k = l2 / (l1 + l2);\n const cm = { x: m2.x + dxm * k, y: m2.y + dym * k };\n\n const tx = s2.x - cm.x;\n const ty = s2.y - cm.y;\n\n return {\n c1: new Point(m1.x + tx, m1.y + ty),\n c2: new Point(m2.x + tx, m2.y + ty),\n };\n }\n\n constructor(\n public startPoint: Point,\n public control2: BasicPoint,\n public control1: BasicPoint,\n public endPoint: Point,\n public startWidth: number,\n public endWidth: number,\n ) {}\n\n // Returns approximated length. Code taken from https://www.lemoda.net/maths/bezier-length/index.html.\n public length(): number {\n const steps = 10;\n let length = 0;\n let px;\n let py;\n\n for (let i = 0; i <= steps; i += 1) {\n const t = i / steps;\n const cx = this.point(\n t,\n this.startPoint.x,\n this.control1.x,\n this.control2.x,\n this.endPoint.x,\n );\n const cy = this.point(\n t,\n this.startPoint.y,\n this.control1.y,\n this.control2.y,\n this.endPoint.y,\n );\n\n if (i > 0) {\n const xdiff = cx - (px as number);\n const ydiff = cy - (py as number);\n\n length += Math.sqrt(xdiff * xdiff + ydiff * ydiff);\n }\n\n px = cx;\n py = cy;\n }\n\n return length;\n }\n\n // Calculate parametric value of x or y given t and the four point coordinates of a cubic bezier curve.\n private point(\n t: number,\n start: number,\n c1: number,\n c2: number,\n end: number,\n ): number {\n // prettier-ignore\n return ( start * (1.0 - t) * (1.0 - t) * (1.0 - t))\n + (3.0 * c1 * (1.0 - t) * (1.0 - t) * t)\n + (3.0 * c2 * (1.0 - t) * t * t)\n + ( end * t * t * t);\n }\n}\n","export class SignatureEventTarget {\n /* tslint:disable: variable-name */\n private _et: EventTarget;\n /* tslint:enable: variable-name */\n\n constructor() {\n try {\n this._et = new EventTarget();\n } catch (error) {\n // Using document as EventTarget to support iOS 13 and older.\n // Because EventTarget constructor just exists at iOS 14 and later.\n this._et = document;\n }\n }\n\n addEventListener(\n type: string,\n listener: EventListenerOrEventListenerObject | null,\n options?: boolean | AddEventListenerOptions,\n ): void {\n this._et.addEventListener(type, listener, options);\n }\n\n dispatchEvent(event: Event): boolean {\n return this._et.dispatchEvent(event);\n }\n\n removeEventListener(\n type: string,\n callback: EventListenerOrEventListenerObject | null,\n options?: boolean | EventListenerOptions,\n ): void {\n this._et.removeEventListener(type, callback, options);\n }\n}\n","/**\n * The main idea and some parts of the code (e.g. drawing variable width Bézier curve) are taken from:\n * http://corner.squareup.com/2012/07/smoother-signatures.html\n *\n * Implementation of interpolation using cubic Bézier curves is taken from:\n * https://web.archive.org/web/20160323213433/http://www.benknowscode.com/2012/09/path-interpolation-using-cubic-bezier_9742.html\n *\n * Algorithm for approximated length of a Bézier curve is taken from:\n * http://www.lemoda.net/maths/bezier-length/index.html\n */\n\nimport { Bezier } from './bezier';\nimport { BasicPoint, Point } from './point';\nimport { SignatureEventTarget } from './signature_event_target';\nimport { throttle } from './throttle';\n\ndeclare global {\n interface CSSStyleDeclaration {\n msTouchAction: string | null;\n }\n}\n\nexport type SignatureEvent = MouseEvent | Touch | PointerEvent;\n\nexport interface FromDataOptions {\n clear?: boolean;\n}\n\nexport interface ToSVGOptions {\n includeBackgroundColor?: boolean;\n}\n\nexport interface PointGroupOptions {\n dotSize: number;\n minWidth: number;\n maxWidth: number;\n penColor: string;\n velocityFilterWeight: number;\n /**\n * This is the globalCompositeOperation for the line.\n * *default: 'source-over'*\n * @see https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/globalCompositeOperation\n */\n compositeOperation: GlobalCompositeOperation;\n}\n\nexport interface Options extends Partial {\n minDistance?: number;\n backgroundColor?: string;\n throttle?: number;\n canvasContextOptions?: CanvasRenderingContext2DSettings;\n}\n\nexport interface PointGroup extends PointGroupOptions {\n points: BasicPoint[];\n}\n\nexport default class SignaturePad extends SignatureEventTarget {\n // Public stuff\n public dotSize: number;\n public minWidth: number;\n public maxWidth: number;\n public penColor: string;\n public minDistance: number;\n public velocityFilterWeight: number;\n public compositeOperation: GlobalCompositeOperation;\n public backgroundColor: string;\n public throttle: number;\n public canvasContextOptions: CanvasRenderingContext2DSettings;\n\n // Private stuff\n /* tslint:disable: variable-name */\n private _ctx: CanvasRenderingContext2D;\n private _drawingStroke = false;\n private _isEmpty = true;\n private _lastPoints: Point[] = []; // Stores up to 4 most recent points; used to generate a new curve\n private _data: PointGroup[] = []; // Stores all points in groups (one group per line or dot)\n private _lastVelocity = 0;\n private _lastWidth = 0;\n private _strokeMoveUpdate: (event: SignatureEvent) => void;\n /* tslint:enable: variable-name */\n\n constructor(\n private canvas: HTMLCanvasElement,\n options: Options = {},\n ) {\n super();\n this.velocityFilterWeight = options.velocityFilterWeight || 0.7;\n this.minWidth = options.minWidth || 0.5;\n this.maxWidth = options.maxWidth || 2.5;\n this.throttle = ('throttle' in options ? options.throttle : 16) as number; // in milisecondss\n this.minDistance = (\n 'minDistance' in options ? options.minDistance : 5\n ) as number; // in pixels\n this.dotSize = options.dotSize || 0;\n this.penColor = options.penColor || 'black';\n this.backgroundColor = options.backgroundColor || 'rgba(0,0,0,0)';\n this.compositeOperation = options.compositeOperation || 'source-over';\n this.canvasContextOptions = (\n 'canvasContextOptions' in options ? options.canvasContextOptions : {}\n ) as CanvasRenderingContext2DSettings;\n\n this._strokeMoveUpdate = this.throttle\n ? throttle(SignaturePad.prototype._strokeUpdate, this.throttle)\n : SignaturePad.prototype._strokeUpdate;\n this._ctx = canvas.getContext(\n '2d',\n this.canvasContextOptions,\n ) as CanvasRenderingContext2D;\n\n this.clear();\n\n // Enable mouse and touch event handlers\n this.on();\n }\n\n public clear(): void {\n const { _ctx: ctx, canvas } = this;\n\n // Clear canvas using background color\n ctx.fillStyle = this.backgroundColor;\n ctx.clearRect(0, 0, canvas.width, canvas.height);\n ctx.fillRect(0, 0, canvas.width, canvas.height);\n\n this._data = [];\n this._reset(this._getPointGroupOptions());\n this._isEmpty = true;\n }\n\n public fromDataURL(\n dataUrl: string,\n options: {\n ratio?: number;\n width?: number;\n height?: number;\n xOffset?: number;\n yOffset?: number;\n } = {},\n ): Promise {\n return new Promise((resolve, reject) => {\n const image = new Image();\n const ratio = options.ratio || window.devicePixelRatio || 1;\n const width = options.width || this.canvas.width / ratio;\n const height = options.height || this.canvas.height / ratio;\n const xOffset = options.xOffset || 0;\n const yOffset = options.yOffset || 0;\n\n this._reset(this._getPointGroupOptions());\n\n image.onload = (): void => {\n this._ctx.drawImage(image, xOffset, yOffset, width, height);\n resolve();\n };\n image.onerror = (error): void => {\n reject(error);\n };\n image.crossOrigin = 'anonymous';\n image.src = dataUrl;\n\n this._isEmpty = false;\n });\n }\n\n public toDataURL(\n type: 'image/svg+xml',\n encoderOptions?: ToSVGOptions,\n ): string;\n public toDataURL(type?: string, encoderOptions?: number): string;\n public toDataURL(\n type = 'image/png',\n encoderOptions?: number | ToSVGOptions | undefined,\n ): string {\n switch (type) {\n case 'image/svg+xml':\n if (typeof encoderOptions !== 'object') {\n encoderOptions = undefined;\n }\n return `data:image/svg+xml;base64,${btoa(\n this.toSVG(encoderOptions as ToSVGOptions),\n )}`;\n default:\n if (typeof encoderOptions !== 'number') {\n encoderOptions = undefined;\n }\n return this.canvas.toDataURL(type, encoderOptions);\n }\n }\n\n public on(): void {\n // Disable panning/zooming when touching canvas element\n this.canvas.style.touchAction = 'none';\n this.canvas.style.msTouchAction = 'none';\n this.canvas.style.userSelect = 'none';\n\n const isIOS =\n /Macintosh/.test(navigator.userAgent) && 'ontouchstart' in document;\n\n // The \"Scribble\" feature of iOS intercepts point events. So that we can lose some of them when tapping rapidly.\n // Use touch events for iOS platforms to prevent it. See https://developer.apple.com/forums/thread/664108 for more information.\n if (window.PointerEvent && !isIOS) {\n this._handlePointerEvents();\n } else {\n this._handleMouseEvents();\n\n if ('ontouchstart' in window) {\n this._handleTouchEvents();\n }\n }\n }\n\n public off(): void {\n // Enable panning/zooming when touching canvas element\n this.canvas.style.touchAction = 'auto';\n this.canvas.style.msTouchAction = 'auto';\n this.canvas.style.userSelect = 'auto';\n\n this.canvas.removeEventListener('pointerdown', this._handlePointerStart);\n this.canvas.removeEventListener('pointermove', this._handlePointerMove);\n this.canvas.ownerDocument.removeEventListener(\n 'pointerup',\n this._handlePointerEnd,\n );\n\n this.canvas.removeEventListener('mousedown', this._handleMouseDown);\n this.canvas.removeEventListener('mousemove', this._handleMouseMove);\n this.canvas.ownerDocument.removeEventListener(\n 'mouseup',\n this._handleMouseUp,\n );\n\n this.canvas.removeEventListener('touchstart', this._handleTouchStart);\n this.canvas.removeEventListener('touchmove', this._handleTouchMove);\n this.canvas.removeEventListener('touchend', this._handleTouchEnd);\n }\n\n public isEmpty(): boolean {\n return this._isEmpty;\n }\n\n public fromData(\n pointGroups: PointGroup[],\n { clear = true }: FromDataOptions = {},\n ): void {\n if (clear) {\n this.clear();\n }\n\n this._fromData(\n pointGroups,\n this._drawCurve.bind(this),\n this._drawDot.bind(this),\n );\n\n this._data = this._data.concat(pointGroups);\n }\n\n public toData(): PointGroup[] {\n return this._data;\n }\n\n // Event handlers\n private _handleMouseDown = (event: MouseEvent): void => {\n if (event.buttons === 1) {\n this._strokeBegin(event);\n }\n };\n\n private _handleMouseMove = (event: MouseEvent): void => {\n this._strokeMoveUpdate(event);\n };\n\n private _handleMouseUp = (event: MouseEvent): void => {\n if (event.buttons === 1) {\n this._strokeEnd(event);\n }\n };\n\n private _handleTouchStart = (event: TouchEvent): void => {\n // Prevent scrolling.\n if (event.cancelable) {\n event.preventDefault();\n }\n\n if (event.targetTouches.length === 1) {\n const touch = event.changedTouches[0];\n this._strokeBegin(touch);\n }\n };\n\n private _handleTouchMove = (event: TouchEvent): void => {\n // Prevent scrolling.\n if (event.cancelable) {\n event.preventDefault();\n }\n\n const touch = event.targetTouches[0];\n this._strokeMoveUpdate(touch);\n };\n\n private _handleTouchEnd = (event: TouchEvent): void => {\n const wasCanvasTouched = event.target === this.canvas;\n if (wasCanvasTouched) {\n if (event.cancelable) {\n event.preventDefault();\n }\n const touch = event.changedTouches[0];\n this._strokeEnd(touch);\n }\n };\n\n private _handlePointerStart = (event: PointerEvent): void => {\n event.preventDefault();\n this._strokeBegin(event);\n };\n\n private _handlePointerMove = (event: PointerEvent): void => {\n this._strokeMoveUpdate(event);\n };\n\n private _handlePointerEnd = (event: PointerEvent): void => {\n if (this._drawingStroke) {\n event.preventDefault();\n this._strokeEnd(event);\n }\n };\n\n private _getPointGroupOptions(group?: PointGroup): PointGroupOptions {\n return {\n penColor: group && 'penColor' in group ? group.penColor : this.penColor,\n dotSize: group && 'dotSize' in group ? group.dotSize : this.dotSize,\n minWidth: group && 'minWidth' in group ? group.minWidth : this.minWidth,\n maxWidth: group && 'maxWidth' in group ? group.maxWidth : this.maxWidth,\n velocityFilterWeight:\n group && 'velocityFilterWeight' in group\n ? group.velocityFilterWeight\n : this.velocityFilterWeight,\n compositeOperation:\n group && 'compositeOperation' in group\n ? group.compositeOperation\n : this.compositeOperation,\n };\n }\n\n // Private methods\n private _strokeBegin(event: SignatureEvent): void {\n const cancelled = !this.dispatchEvent(\n new CustomEvent('beginStroke', { detail: event, cancelable: true }),\n );\n if (cancelled) {\n return;\n }\n this._drawingStroke = true;\n\n const pointGroupOptions = this._getPointGroupOptions();\n\n const newPointGroup: PointGroup = {\n ...pointGroupOptions,\n points: [],\n };\n\n this._data.push(newPointGroup);\n this._reset(pointGroupOptions);\n this._strokeUpdate(event);\n }\n\n private _strokeUpdate(event: SignatureEvent): void {\n if (!this._drawingStroke) {\n return;\n }\n\n if (this._data.length === 0) {\n // This can happen if clear() was called while a signature is still in progress,\n // or if there is a race condition between start/update events.\n this._strokeBegin(event);\n return;\n }\n\n this.dispatchEvent(\n new CustomEvent('beforeUpdateStroke', { detail: event }),\n );\n\n const x = event.clientX;\n const y = event.clientY;\n const pressure =\n (event as PointerEvent).pressure !== undefined\n ? (event as PointerEvent).pressure\n : (event as Touch).force !== undefined\n ? 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\ No newline at end of file +{"version":3,"file":"signature_pad.umd.min.js","sources":["../src/point.ts","../src/bezier.ts","../src/signature_event_target.ts","../src/signature_pad.ts","../src/throttle.ts"],"sourcesContent":["// Interface for point data structure used e.g. in SignaturePad#fromData method\nexport interface BasicPoint {\n x: number;\n y: number;\n pressure: number;\n time: number;\n}\n\nexport class Point implements BasicPoint {\n public x: number;\n public y: number;\n public pressure: number;\n public time: number;\n\n constructor(x: number, y: number, pressure?: number, time?: number) {\n if (isNaN(x) || isNaN(y)) {\n throw new Error(`Point is invalid: (${x}, ${y})`);\n }\n this.x = +x;\n this.y = +y;\n this.pressure = pressure || 0;\n this.time = time || Date.now();\n }\n\n public distanceTo(start: BasicPoint): number {\n return Math.sqrt(\n Math.pow(this.x - start.x, 2) + Math.pow(this.y - start.y, 2),\n );\n }\n\n public equals(other: BasicPoint): boolean {\n return (\n this.x === other.x &&\n this.y === other.y &&\n this.pressure === other.pressure &&\n this.time === other.time\n );\n }\n\n public velocityFrom(start: BasicPoint): number {\n return this.time !== start.time\n ? this.distanceTo(start) / (this.time - start.time)\n : 0;\n }\n}\n","import { BasicPoint, Point } from './point';\n\nexport class Bezier {\n public static fromPoints(\n points: Point[],\n widths: { start: number; end: number },\n ): Bezier {\n const c2 = this.calculateControlPoints(points[0], points[1], points[2]).c2;\n const c3 = this.calculateControlPoints(points[1], points[2], points[3]).c1;\n\n return new Bezier(points[1], c2, c3, points[2], widths.start, widths.end);\n }\n\n private static calculateControlPoints(\n s1: BasicPoint,\n s2: BasicPoint,\n s3: BasicPoint,\n ): {\n c1: BasicPoint;\n c2: BasicPoint;\n } {\n const dx1 = s1.x - s2.x;\n const dy1 = s1.y - s2.y;\n const dx2 = s2.x - s3.x;\n const dy2 = s2.y - s3.y;\n\n const m1 = { x: (s1.x + s2.x) / 2.0, y: (s1.y + s2.y) / 2.0 };\n const m2 = { x: (s2.x + s3.x) / 2.0, y: (s2.y + s3.y) / 2.0 };\n\n const l1 = Math.sqrt(dx1 * dx1 + dy1 * dy1);\n const l2 = Math.sqrt(dx2 * dx2 + dy2 * dy2);\n\n const dxm = m1.x - m2.x;\n const dym = m1.y - m2.y;\n\n const k = l2 / (l1 + l2);\n const cm = { x: m2.x + dxm * k, y: m2.y + dym * k };\n\n const tx = s2.x - cm.x;\n const ty = s2.y - cm.y;\n\n return {\n c1: new Point(m1.x + tx, m1.y + ty),\n c2: new Point(m2.x + tx, m2.y + ty),\n };\n }\n\n constructor(\n public startPoint: Point,\n public control2: BasicPoint,\n public control1: BasicPoint,\n public endPoint: Point,\n public startWidth: number,\n public endWidth: number,\n ) {}\n\n // Returns approximated length. Code taken from https://www.lemoda.net/maths/bezier-length/index.html.\n public length(): number {\n const steps = 10;\n let length = 0;\n let px;\n let py;\n\n for (let i = 0; i <= steps; i += 1) {\n const t = i / steps;\n const cx = this.point(\n t,\n this.startPoint.x,\n this.control1.x,\n this.control2.x,\n this.endPoint.x,\n );\n const cy = this.point(\n t,\n this.startPoint.y,\n this.control1.y,\n this.control2.y,\n this.endPoint.y,\n );\n\n if (i > 0) {\n const xdiff = cx - (px as number);\n const ydiff = cy - (py as number);\n\n length += Math.sqrt(xdiff * xdiff + ydiff * ydiff);\n }\n\n px = cx;\n py = cy;\n }\n\n return length;\n }\n\n // Calculate parametric value of x or y given t and the four point coordinates of a cubic bezier curve.\n private point(\n t: number,\n start: number,\n c1: number,\n c2: number,\n end: number,\n ): number {\n // prettier-ignore\n return ( start * (1.0 - t) * (1.0 - t) * (1.0 - t))\n + (3.0 * c1 * (1.0 - t) * (1.0 - t) * t)\n + (3.0 * c2 * (1.0 - t) * t * t)\n + ( end * t * t * t);\n }\n}\n","export class SignatureEventTarget {\n /* tslint:disable: variable-name */\n private _et: EventTarget;\n /* tslint:enable: variable-name */\n\n constructor() {\n try {\n this._et = new EventTarget();\n } catch (error) {\n // Using document as EventTarget to support iOS 13 and older.\n // Because EventTarget constructor just exists at iOS 14 and later.\n this._et = document;\n }\n }\n\n addEventListener(\n type: string,\n listener: EventListenerOrEventListenerObject | null,\n options?: boolean | AddEventListenerOptions,\n ): void {\n this._et.addEventListener(type, listener, options);\n }\n\n dispatchEvent(event: Event): boolean {\n return this._et.dispatchEvent(event);\n }\n\n removeEventListener(\n type: string,\n callback: EventListenerOrEventListenerObject | null,\n options?: boolean | EventListenerOptions,\n ): void {\n this._et.removeEventListener(type, callback, options);\n }\n}\n","/**\n * The main idea and some parts of the code (e.g. drawing variable width Bézier curve) are taken from:\n * http://corner.squareup.com/2012/07/smoother-signatures.html\n *\n * Implementation of interpolation using cubic Bézier curves is taken from:\n * https://web.archive.org/web/20160323213433/http://www.benknowscode.com/2012/09/path-interpolation-using-cubic-bezier_9742.html\n *\n * Algorithm for approximated length of a Bézier curve is taken from:\n * http://www.lemoda.net/maths/bezier-length/index.html\n */\n\nimport { Bezier } from './bezier';\nimport { BasicPoint, Point } from './point';\nimport { SignatureEventTarget } from './signature_event_target';\nimport { throttle } from './throttle';\n\ndeclare global {\n interface CSSStyleDeclaration {\n msTouchAction: string | null;\n }\n}\n\nexport interface SignatureEvent {\n event: MouseEvent | TouchEvent | PointerEvent;\n type: string;\n x: number;\n y: number;\n pressure: number;\n}\n\nexport interface FromDataOptions {\n clear?: boolean;\n}\n\nexport interface ToSVGOptions {\n includeBackgroundColor?: boolean;\n}\n\nexport interface PointGroupOptions {\n dotSize: number;\n minWidth: number;\n maxWidth: number;\n penColor: string;\n velocityFilterWeight: number;\n /**\n * This is the globalCompositeOperation for the line.\n * *default: 'source-over'*\n * @see https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/globalCompositeOperation\n */\n compositeOperation: GlobalCompositeOperation;\n}\n\nexport interface Options extends Partial {\n minDistance?: number;\n backgroundColor?: string;\n throttle?: number;\n canvasContextOptions?: CanvasRenderingContext2DSettings;\n}\n\nexport interface PointGroup extends PointGroupOptions {\n points: BasicPoint[];\n}\n\nexport default class SignaturePad extends SignatureEventTarget {\n // Public stuff\n public dotSize: number;\n public minWidth: number;\n public maxWidth: number;\n public penColor: string;\n public minDistance: number;\n public velocityFilterWeight: number;\n public compositeOperation: GlobalCompositeOperation;\n public backgroundColor: string;\n public throttle: number;\n public canvasContextOptions: CanvasRenderingContext2DSettings;\n\n // Private stuff\n /* tslint:disable: variable-name */\n private _ctx: CanvasRenderingContext2D;\n private _drawingStroke = false;\n private _isEmpty = true;\n private _lastPoints: Point[] = []; // Stores up to 4 most recent points; used to generate a new curve\n private _data: PointGroup[] = []; // Stores all points in groups (one group per line or dot)\n private _lastVelocity = 0;\n private _lastWidth = 0;\n private _strokeMoveUpdate: (event: SignatureEvent) => void;\n /* tslint:enable: variable-name */\n\n constructor(\n private canvas: HTMLCanvasElement,\n options: Options = {},\n ) {\n super();\n this.velocityFilterWeight = options.velocityFilterWeight || 0.7;\n this.minWidth = options.minWidth || 0.5;\n this.maxWidth = options.maxWidth || 2.5;\n this.throttle = ('throttle' in options ? options.throttle : 16) as number; // in milliseconds\n this.minDistance = (\n 'minDistance' in options ? options.minDistance : 5\n ) as number; // in pixels\n this.dotSize = options.dotSize || 0;\n this.penColor = options.penColor || 'black';\n this.backgroundColor = options.backgroundColor || 'rgba(0,0,0,0)';\n this.compositeOperation = options.compositeOperation || 'source-over';\n this.canvasContextOptions = (\n 'canvasContextOptions' in options ? options.canvasContextOptions : {}\n ) as CanvasRenderingContext2DSettings;\n\n this._strokeMoveUpdate = this.throttle\n ? throttle(SignaturePad.prototype._strokeUpdate, this.throttle)\n : SignaturePad.prototype._strokeUpdate;\n this._ctx = canvas.getContext(\n '2d',\n this.canvasContextOptions,\n ) as CanvasRenderingContext2D;\n\n this.clear();\n\n // Enable mouse and touch event handlers\n this.on();\n }\n\n public clear(): void {\n const { _ctx: ctx, canvas } = this;\n\n // Clear canvas using background color\n ctx.fillStyle = this.backgroundColor;\n ctx.clearRect(0, 0, canvas.width, canvas.height);\n ctx.fillRect(0, 0, canvas.width, canvas.height);\n\n this._data = [];\n this._reset(this._getPointGroupOptions());\n this._isEmpty = true;\n }\n\n public fromDataURL(\n dataUrl: string,\n options: {\n ratio?: number;\n width?: number;\n height?: number;\n xOffset?: number;\n yOffset?: number;\n } = {},\n ): Promise {\n return new Promise((resolve, reject) => {\n const image = new Image();\n const ratio = options.ratio || window.devicePixelRatio || 1;\n const width = options.width || this.canvas.width / ratio;\n const height = options.height || this.canvas.height / ratio;\n const xOffset = options.xOffset || 0;\n const yOffset = options.yOffset || 0;\n\n this._reset(this._getPointGroupOptions());\n\n image.onload = (): void => {\n this._ctx.drawImage(image, xOffset, yOffset, width, height);\n resolve();\n };\n image.onerror = (error): void => {\n reject(error);\n };\n image.crossOrigin = 'anonymous';\n image.src = dataUrl;\n\n this._isEmpty = false;\n });\n }\n\n public toDataURL(\n type: 'image/svg+xml',\n encoderOptions?: ToSVGOptions,\n ): string;\n public toDataURL(type?: string, encoderOptions?: number): string;\n public toDataURL(\n type = 'image/png',\n encoderOptions?: number | ToSVGOptions | undefined,\n ): string {\n switch (type) {\n case 'image/svg+xml':\n if (typeof encoderOptions !== 'object') {\n encoderOptions = undefined;\n }\n return `data:image/svg+xml;base64,${btoa(\n this.toSVG(encoderOptions as ToSVGOptions),\n )}`;\n default:\n if (typeof encoderOptions !== 'number') {\n encoderOptions = undefined;\n }\n return this.canvas.toDataURL(type, encoderOptions);\n }\n }\n\n public on(): void {\n // Disable panning/zooming when touching canvas element\n this.canvas.style.touchAction = 'none';\n this.canvas.style.msTouchAction = 'none';\n this.canvas.style.userSelect = 'none';\n\n const isIOS =\n /Macintosh/.test(navigator.userAgent) && 'ontouchstart' in document;\n\n // The \"Scribble\" feature of iOS intercepts point events. So that we can\n // lose some of them when tapping rapidly. Use touch events for iOS\n // platforms to prevent it. See\n // https://developer.apple.com/forums/thread/664108 for more information.\n if (window.PointerEvent && !isIOS) {\n this._handlePointerEvents();\n } else {\n this._handleMouseEvents();\n\n if ('ontouchstart' in window) {\n this._handleTouchEvents();\n }\n }\n }\n\n public off(): void {\n // Enable panning/zooming when touching canvas element\n this.canvas.style.touchAction = 'auto';\n this.canvas.style.msTouchAction = 'auto';\n this.canvas.style.userSelect = 'auto';\n\n this.canvas.removeEventListener('pointerdown', this._handlePointerDown);\n this.canvas.removeEventListener('mousedown', this._handleMouseDown);\n this.canvas.removeEventListener('touchstart', this._handleTouchStart);\n\n this._removeMoveUpEventListeners();\n }\n\n private _getListenerFunctions() {\n const canvasWindow =\n window.document === this.canvas.ownerDocument\n ? window\n : this.canvas.ownerDocument.defaultView ?? this.canvas.ownerDocument;\n\n return {\n addEventListener: canvasWindow.addEventListener.bind(\n canvasWindow,\n ) as typeof window.addEventListener,\n removeEventListener: canvasWindow.removeEventListener.bind(\n canvasWindow,\n ) as typeof window.removeEventListener,\n };\n }\n\n private _removeMoveUpEventListeners(): void {\n const { removeEventListener } = this._getListenerFunctions();\n removeEventListener('pointermove', this._handlePointerMove);\n removeEventListener('pointerup', this._handlePointerUp);\n\n removeEventListener('mousemove', this._handleMouseMove);\n removeEventListener('mouseup', this._handleMouseUp);\n\n removeEventListener('touchmove', this._handleTouchMove);\n removeEventListener('touchend', this._handleTouchEnd);\n }\n\n public isEmpty(): boolean {\n return this._isEmpty;\n }\n\n public fromData(\n pointGroups: PointGroup[],\n { clear = true }: FromDataOptions = {},\n ): void {\n if (clear) {\n this.clear();\n }\n\n this._fromData(\n pointGroups,\n this._drawCurve.bind(this),\n this._drawDot.bind(this),\n );\n\n this._data = this._data.concat(pointGroups);\n }\n\n public toData(): PointGroup[] {\n return this._data;\n }\n\n public _isLeftButtonPressed(event: MouseEvent, only?: boolean): boolean {\n if (only) {\n return event.buttons === 1;\n }\n\n return (event.buttons & 1) === 1;\n }\n private _pointerEventToSignatureEvent(\n event: MouseEvent | PointerEvent,\n ): SignatureEvent {\n return {\n event: event,\n type: event.type,\n x: event.clientX,\n y: event.clientY,\n pressure: 'pressure' in event ? event.pressure : 0,\n };\n }\n\n private _touchEventToSignatureEvent(event: TouchEvent): SignatureEvent {\n const touch = event.changedTouches[0];\n return {\n event: event,\n type: event.type,\n x: touch.clientX,\n y: touch.clientY,\n pressure: touch.force,\n };\n }\n\n // Event handlers\n private _handleMouseDown = (event: MouseEvent): void => {\n if (!this._isLeftButtonPressed(event, true) || this._drawingStroke) {\n return;\n }\n this._strokeBegin(this._pointerEventToSignatureEvent(event));\n };\n\n private _handleMouseMove = (event: MouseEvent): void => {\n if (!this._isLeftButtonPressed(event, true) || !this._drawingStroke) {\n // Stop when not pressing primary button or pressing multiple buttons\n this._strokeEnd(this._pointerEventToSignatureEvent(event), false);\n return;\n }\n\n this._strokeMoveUpdate(this._pointerEventToSignatureEvent(event));\n };\n\n private _handleMouseUp = (event: MouseEvent): void => {\n if (this._isLeftButtonPressed(event)) {\n return;\n }\n\n this._strokeEnd(this._pointerEventToSignatureEvent(event));\n };\n\n private _handleTouchStart = (event: TouchEvent): void => {\n if (event.targetTouches.length !== 1 || this._drawingStroke) {\n return;\n }\n\n // Prevent scrolling.\n if (event.cancelable) {\n event.preventDefault();\n }\n\n this._strokeBegin(this._touchEventToSignatureEvent(event));\n };\n\n private _handleTouchMove = (event: TouchEvent): void => {\n if (event.targetTouches.length !== 1) {\n return;\n }\n\n // Prevent scrolling.\n if (event.cancelable) {\n event.preventDefault();\n }\n\n if (!this._drawingStroke) {\n this._strokeEnd(this._touchEventToSignatureEvent(event), false);\n return;\n }\n\n this._strokeMoveUpdate(this._touchEventToSignatureEvent(event));\n };\n\n private _handleTouchEnd = (event: TouchEvent): void => {\n if (event.targetTouches.length !== 0) {\n return;\n }\n\n if (event.cancelable) {\n event.preventDefault();\n }\n\n this.canvas.removeEventListener('touchmove', this._handleTouchMove);\n\n this._strokeEnd(this._touchEventToSignatureEvent(event));\n };\n\n private _handlePointerDown = (event: PointerEvent): void => {\n if (!this._isLeftButtonPressed(event) || this._drawingStroke) {\n return;\n }\n\n event.preventDefault();\n\n this._strokeBegin(this._pointerEventToSignatureEvent(event));\n };\n\n private _handlePointerMove = (event: PointerEvent): void => {\n if (!this._isLeftButtonPressed(event, true) || !this._drawingStroke) {\n // Stop when primary button not pressed or multiple buttons pressed\n this._strokeEnd(this._pointerEventToSignatureEvent(event), false);\n return;\n }\n\n event.preventDefault();\n this._strokeMoveUpdate(this._pointerEventToSignatureEvent(event));\n };\n\n private _handlePointerUp = (event: PointerEvent): void => {\n if (this._isLeftButtonPressed(event)) {\n return;\n }\n\n event.preventDefault();\n this._strokeEnd(this._pointerEventToSignatureEvent(event));\n };\n\n private _getPointGroupOptions(group?: PointGroup): PointGroupOptions {\n return {\n penColor: group && 'penColor' in group ? group.penColor : this.penColor,\n dotSize: group && 'dotSize' in group ? group.dotSize : this.dotSize,\n minWidth: group && 'minWidth' in group ? group.minWidth : this.minWidth,\n maxWidth: group && 'maxWidth' in group ? group.maxWidth : this.maxWidth,\n velocityFilterWeight:\n group && 'velocityFilterWeight' in group\n ? group.velocityFilterWeight\n : this.velocityFilterWeight,\n compositeOperation:\n group && 'compositeOperation' in group\n ? group.compositeOperation\n : this.compositeOperation,\n };\n }\n\n // Private methods\n private _strokeBegin(event: SignatureEvent): void {\n const cancelled = !this.dispatchEvent(\n new CustomEvent('beginStroke', { detail: event, cancelable: true }),\n );\n if (cancelled) {\n return;\n }\n\n const { addEventListener } = this._getListenerFunctions();\n switch (event.event.type) {\n case 'mousedown':\n addEventListener('mousemove', this._handleMouseMove);\n addEventListener('mouseup', this._handleMouseUp);\n break;\n case 'touchstart':\n addEventListener('touchmove', this._handleTouchMove);\n addEventListener('touchend', this._handleTouchEnd);\n break;\n case 'pointerdown':\n addEventListener('pointermove', this._handlePointerMove);\n addEventListener('pointerup', this._handlePointerUp);\n break;\n default:\n // do nothing\n }\n\n this._drawingStroke = true;\n\n const pointGroupOptions = this._getPointGroupOptions();\n\n const newPointGroup: PointGroup = {\n ...pointGroupOptions,\n points: [],\n };\n\n this._data.push(newPointGroup);\n this._reset(pointGroupOptions);\n this._strokeUpdate(event);\n }\n\n private _strokeUpdate(event: SignatureEvent): void {\n if (!this._drawingStroke) {\n return;\n }\n\n if (this._data.length === 0) {\n // This can happen if clear() was called while a signature is still in progress,\n // or if there is a race condition between start/update events.\n this._strokeBegin(event);\n return;\n }\n\n this.dispatchEvent(\n new CustomEvent('beforeUpdateStroke', { detail: event }),\n );\n\n const point = this._createPoint(event.x, event.y, event.pressure);\n const lastPointGroup = this._data[this._data.length - 1];\n const lastPoints = lastPointGroup.points;\n const lastPoint =\n lastPoints.length > 0 && lastPoints[lastPoints.length - 1];\n const isLastPointTooClose = lastPoint\n ? point.distanceTo(lastPoint) <= this.minDistance\n : false;\n const pointGroupOptions = this._getPointGroupOptions(lastPointGroup);\n\n // Skip this point if it's too close to the previous one\n if (!lastPoint || !(lastPoint && isLastPointTooClose)) {\n const curve = this._addPoint(point, pointGroupOptions);\n\n if (!lastPoint) {\n this._drawDot(point, pointGroupOptions);\n } else if (curve) {\n this._drawCurve(curve, pointGroupOptions);\n }\n\n lastPoints.push({\n time: point.time,\n x: point.x,\n y: point.y,\n pressure: point.pressure,\n });\n }\n\n this.dispatchEvent(new CustomEvent('afterUpdateStroke', { detail: event }));\n }\n\n private _strokeEnd(event: SignatureEvent, shouldUpdate = true): void {\n this._removeMoveUpEventListeners();\n\n if (!this._drawingStroke) {\n return;\n }\n\n if (shouldUpdate) {\n this._strokeUpdate(event);\n }\n\n this._drawingStroke = false;\n this.dispatchEvent(new CustomEvent('endStroke', { detail: event }));\n }\n\n private _handlePointerEvents(): void {\n this._drawingStroke = false;\n\n this.canvas.addEventListener('pointerdown', this._handlePointerDown);\n }\n\n private _handleMouseEvents(): void {\n this._drawingStroke = false;\n\n this.canvas.addEventListener('mousedown', this._handleMouseDown);\n }\n\n private _handleTouchEvents(): void {\n this.canvas.addEventListener('touchstart', this._handleTouchStart);\n }\n\n // Called when a new line is started\n private _reset(options: PointGroupOptions): void {\n this._lastPoints = [];\n this._lastVelocity = 0;\n this._lastWidth = (options.minWidth + options.maxWidth) / 2;\n this._ctx.fillStyle = options.penColor;\n this._ctx.globalCompositeOperation = options.compositeOperation;\n }\n\n private _createPoint(x: number, y: number, pressure: number): Point {\n const rect = this.canvas.getBoundingClientRect();\n\n return new Point(\n x - rect.left,\n y - rect.top,\n pressure,\n new Date().getTime(),\n );\n }\n\n // Add point to _lastPoints array and generate a new curve if there are enough points (i.e. 3)\n private _addPoint(point: Point, options: PointGroupOptions): Bezier | null {\n const { _lastPoints } = this;\n\n _lastPoints.push(point);\n\n if (_lastPoints.length > 2) {\n // To reduce the initial lag make it work with 3 points\n // by copying the first point to the beginning.\n if (_lastPoints.length === 3) {\n _lastPoints.unshift(_lastPoints[0]);\n }\n\n // _points array will always have 4 points here.\n const widths = this._calculateCurveWidths(\n _lastPoints[1],\n _lastPoints[2],\n options,\n );\n const curve = Bezier.fromPoints(_lastPoints, widths);\n\n // Remove the first element from the list, so that there are no more than 4 points at any time.\n _lastPoints.shift();\n\n return curve;\n }\n\n return null;\n }\n\n private _calculateCurveWidths(\n startPoint: Point,\n endPoint: Point,\n options: PointGroupOptions,\n ): { start: number; end: number } {\n const velocity =\n options.velocityFilterWeight * endPoint.velocityFrom(startPoint) +\n (1 - options.velocityFilterWeight) * this._lastVelocity;\n\n const newWidth = this._strokeWidth(velocity, options);\n\n const widths = {\n end: newWidth,\n start: this._lastWidth,\n };\n\n this._lastVelocity = velocity;\n this._lastWidth = newWidth;\n\n return widths;\n }\n\n private _strokeWidth(velocity: number, options: PointGroupOptions): number {\n return Math.max(options.maxWidth / (velocity + 1), options.minWidth);\n }\n\n private _drawCurveSegment(x: number, y: number, width: number): void {\n const ctx = this._ctx;\n\n ctx.moveTo(x, y);\n ctx.arc(x, y, width, 0, 2 * Math.PI, false);\n this._isEmpty = false;\n }\n\n private _drawCurve(curve: Bezier, options: PointGroupOptions): void {\n const ctx = this._ctx;\n const widthDelta = curve.endWidth - curve.startWidth;\n // '2' is just an arbitrary number here. If only length is used, then\n // there are gaps between curve segments :/\n const drawSteps = Math.ceil(curve.length()) * 2;\n\n ctx.beginPath();\n ctx.fillStyle = options.penColor;\n\n for (let i = 0; i < drawSteps; i += 1) {\n // Calculate the Bezier (x, y) coordinate for this step.\n const t = i / drawSteps;\n const tt = t * t;\n const ttt = tt * t;\n const u = 1 - t;\n const uu = u * u;\n const uuu = uu * u;\n\n let x = uuu * curve.startPoint.x;\n x += 3 * uu * t * curve.control1.x;\n x += 3 * u * tt * curve.control2.x;\n x += ttt * curve.endPoint.x;\n\n let y = uuu * curve.startPoint.y;\n y += 3 * uu * t * curve.control1.y;\n y += 3 * u * tt * curve.control2.y;\n y += ttt * curve.endPoint.y;\n\n const width = Math.min(\n curve.startWidth + ttt * widthDelta,\n options.maxWidth,\n );\n this._drawCurveSegment(x, y, width);\n }\n\n ctx.closePath();\n ctx.fill();\n }\n\n private _drawDot(point: BasicPoint, options: PointGroupOptions): void {\n const ctx = this._ctx;\n const width =\n options.dotSize > 0\n ? options.dotSize\n : (options.minWidth + options.maxWidth) / 2;\n\n ctx.beginPath();\n this._drawCurveSegment(point.x, point.y, width);\n ctx.closePath();\n ctx.fillStyle = options.penColor;\n ctx.fill();\n }\n\n private _fromData(\n pointGroups: PointGroup[],\n drawCurve: SignaturePad['_drawCurve'],\n drawDot: SignaturePad['_drawDot'],\n ): void {\n for (const group of pointGroups) {\n const { points } = group;\n const pointGroupOptions = this._getPointGroupOptions(group);\n\n if (points.length > 1) {\n for (let j = 0; j < points.length; j += 1) {\n const basicPoint = points[j];\n const point = new Point(\n basicPoint.x,\n basicPoint.y,\n basicPoint.pressure,\n basicPoint.time,\n );\n\n if (j === 0) {\n this._reset(pointGroupOptions);\n }\n\n const curve = this._addPoint(point, pointGroupOptions);\n\n if (curve) {\n drawCurve(curve, pointGroupOptions);\n }\n }\n } else {\n this._reset(pointGroupOptions);\n\n drawDot(points[0], pointGroupOptions);\n }\n }\n }\n\n public toSVG({ includeBackgroundColor = false }: ToSVGOptions = {}): string {\n const pointGroups = this._data;\n const ratio = Math.max(window.devicePixelRatio || 1, 1);\n const minX = 0;\n const minY = 0;\n const maxX = this.canvas.width / ratio;\n const maxY = this.canvas.height / ratio;\n const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');\n\n svg.setAttribute('xmlns', 'http://www.w3.org/2000/svg');\n svg.setAttribute('xmlns:xlink', 'http://www.w3.org/1999/xlink');\n svg.setAttribute('viewBox', `${minX} ${minY} ${maxX} ${maxY}`);\n svg.setAttribute('width', maxX.toString());\n svg.setAttribute('height', maxY.toString());\n\n if (includeBackgroundColor && this.backgroundColor) {\n const rect = document.createElement('rect');\n rect.setAttribute('width', '100%');\n rect.setAttribute('height', '100%');\n rect.setAttribute('fill', this.backgroundColor);\n\n svg.appendChild(rect);\n }\n\n this._fromData(\n pointGroups,\n\n (curve, { penColor }) => {\n const path = document.createElement('path');\n\n // Need to check curve for NaN values, these pop up when drawing\n // lines on the canvas that are not continuous. E.g. Sharp corners\n // or stopping mid-stroke and than continuing without lifting mouse.\n /* eslint-disable no-restricted-globals */\n if (\n !isNaN(curve.control1.x) &&\n !isNaN(curve.control1.y) &&\n !isNaN(curve.control2.x) &&\n !isNaN(curve.control2.y)\n ) {\n const attr =\n `M ${curve.startPoint.x.toFixed(3)},${curve.startPoint.y.toFixed(\n 3,\n )} ` +\n `C ${curve.control1.x.toFixed(3)},${curve.control1.y.toFixed(3)} ` +\n `${curve.control2.x.toFixed(3)},${curve.control2.y.toFixed(3)} ` +\n `${curve.endPoint.x.toFixed(3)},${curve.endPoint.y.toFixed(3)}`;\n path.setAttribute('d', attr);\n path.setAttribute('stroke-width', (curve.endWidth * 2.25).toFixed(3));\n path.setAttribute('stroke', penColor);\n path.setAttribute('fill', 'none');\n path.setAttribute('stroke-linecap', 'round');\n\n svg.appendChild(path);\n }\n /* eslint-enable no-restricted-globals */\n },\n\n (point, { penColor, dotSize, minWidth, maxWidth }) => {\n const circle = document.createElement('circle');\n const size = dotSize > 0 ? dotSize : (minWidth + maxWidth) / 2;\n circle.setAttribute('r', size.toString());\n circle.setAttribute('cx', point.x.toString());\n circle.setAttribute('cy', point.y.toString());\n circle.setAttribute('fill', penColor);\n\n svg.appendChild(circle);\n },\n );\n\n return svg.outerHTML;\n }\n}\n","/* eslint-disable @typescript-eslint/no-explicit-any, @typescript-eslint/no-this-alias */\n// Slightly simplified version of http://stackoverflow.com/a/27078401/815507\n\nexport function throttle(\n fn: (...args: any[]) => any,\n wait = 250,\n): (this: any, ...args: any[]) => any {\n let previous = 0;\n let timeout: number | null = null;\n let result: any;\n let storedContext: any;\n let storedArgs: any[];\n\n const later = (): void => {\n previous = Date.now();\n timeout = null;\n result = fn.apply(storedContext, storedArgs);\n\n if (!timeout) {\n storedContext = null;\n storedArgs = [];\n }\n };\n\n return function wrapper(this: any, ...args: any[]): any {\n const now = Date.now();\n const remaining = wait - (now - previous);\n\n storedContext = this;\n storedArgs = args;\n\n if (remaining <= 0 || remaining > wait) {\n if (timeout) {\n clearTimeout(timeout);\n timeout = null;\n }\n\n previous = now;\n result = fn.apply(storedContext, storedArgs);\n\n if (!timeout) {\n storedContext = null;\n storedArgs = [];\n }\n } else if (!timeout) {\n timeout = window.setTimeout(later, remaining);\n }\n\n return result;\n 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\ No newline at end of file diff --git a/src/signature_pad.ts b/src/signature_pad.ts index 91ba2124..35b8a4c5 100644 --- a/src/signature_pad.ts +++ b/src/signature_pad.ts @@ -20,7 +20,13 @@ declare global { } } -export type SignatureEvent = MouseEvent | Touch | PointerEvent; +export interface SignatureEvent { + event: MouseEvent | TouchEvent | PointerEvent; + type: string; + x: number; + y: number; + pressure: number; +} export interface FromDataOptions { clear?: boolean; @@ -88,7 +94,7 @@ export default class SignaturePad extends SignatureEventTarget { this.velocityFilterWeight = options.velocityFilterWeight || 0.7; this.minWidth = options.minWidth || 0.5; this.maxWidth = options.maxWidth || 2.5; - this.throttle = ('throttle' in options ? options.throttle : 16) as number; // in milisecondss + this.throttle = ('throttle' in options ? options.throttle : 16) as number; // in milliseconds this.minDistance = ( 'minDistance' in options ? options.minDistance : 5 ) as number; // in pixels @@ -195,8 +201,10 @@ export default class SignaturePad extends SignatureEventTarget { const isIOS = /Macintosh/.test(navigator.userAgent) && 'ontouchstart' in document; - // The "Scribble" feature of iOS intercepts point events. So that we can lose some of them when tapping rapidly. - // Use touch events for iOS platforms to prevent it. See https://developer.apple.com/forums/thread/664108 for more information. + // The "Scribble" feature of iOS intercepts point events. So that we can + // lose some of them when tapping rapidly. Use touch events for iOS + // platforms to prevent it. See + // https://developer.apple.com/forums/thread/664108 for more information. if (window.PointerEvent && !isIOS) { this._handlePointerEvents(); } else { @@ -214,23 +222,39 @@ export default class SignaturePad extends SignatureEventTarget { this.canvas.style.msTouchAction = 'auto'; this.canvas.style.userSelect = 'auto'; - this.canvas.removeEventListener('pointerdown', this._handlePointerStart); - this.canvas.removeEventListener('pointermove', this._handlePointerMove); - this.canvas.ownerDocument.removeEventListener( - 'pointerup', - this._handlePointerEnd, - ); - + this.canvas.removeEventListener('pointerdown', this._handlePointerDown); this.canvas.removeEventListener('mousedown', this._handleMouseDown); - this.canvas.removeEventListener('mousemove', this._handleMouseMove); - this.canvas.ownerDocument.removeEventListener( - 'mouseup', - this._handleMouseUp, - ); - this.canvas.removeEventListener('touchstart', this._handleTouchStart); - this.canvas.removeEventListener('touchmove', this._handleTouchMove); - this.canvas.removeEventListener('touchend', this._handleTouchEnd); + + this._removeMoveUpEventListeners(); + } + + private _getListenerFunctions() { + const canvasWindow = + window.document === this.canvas.ownerDocument + ? window + : this.canvas.ownerDocument.defaultView ?? this.canvas.ownerDocument; + + return { + addEventListener: canvasWindow.addEventListener.bind( + canvasWindow, + ) as typeof window.addEventListener, + removeEventListener: canvasWindow.removeEventListener.bind( + canvasWindow, + ) as typeof window.removeEventListener, + }; + } + + private _removeMoveUpEventListeners(): void { + const { removeEventListener } = this._getListenerFunctions(); + removeEventListener('pointermove', this._handlePointerMove); + removeEventListener('pointerup', this._handlePointerUp); + + removeEventListener('mousemove', this._handleMouseMove); + removeEventListener('mouseup', this._handleMouseUp); + + removeEventListener('touchmove', this._handleTouchMove); + removeEventListener('touchend', this._handleTouchEnd); } public isEmpty(): boolean { @@ -258,70 +282,135 @@ export default class SignaturePad extends SignatureEventTarget { return this._data; } + public _isLeftButtonPressed(event: MouseEvent, only?: boolean): boolean { + if (only) { + return event.buttons === 1; + } + + return (event.buttons & 1) === 1; + } + private _pointerEventToSignatureEvent( + event: MouseEvent | PointerEvent, + ): SignatureEvent { + return { + event: event, + type: event.type, + x: event.clientX, + y: event.clientY, + pressure: 'pressure' in event ? event.pressure : 0, + }; + } + + private _touchEventToSignatureEvent(event: TouchEvent): SignatureEvent { + const touch = event.changedTouches[0]; + return { + event: event, + type: event.type, + x: touch.clientX, + y: touch.clientY, + pressure: touch.force, + }; + } + // Event handlers private _handleMouseDown = (event: MouseEvent): void => { - if (event.buttons === 1) { - this._strokeBegin(event); + if (!this._isLeftButtonPressed(event, true) || this._drawingStroke) { + return; } + this._strokeBegin(this._pointerEventToSignatureEvent(event)); }; private _handleMouseMove = (event: MouseEvent): void => { - this._strokeMoveUpdate(event); + if (!this._isLeftButtonPressed(event, true) || !this._drawingStroke) { + // Stop when not pressing primary button or pressing multiple buttons + this._strokeEnd(this._pointerEventToSignatureEvent(event), false); + return; + } + + this._strokeMoveUpdate(this._pointerEventToSignatureEvent(event)); }; private _handleMouseUp = (event: MouseEvent): void => { - if (event.buttons === 1) { - this._strokeEnd(event); + if (this._isLeftButtonPressed(event)) { + return; } + + this._strokeEnd(this._pointerEventToSignatureEvent(event)); }; private _handleTouchStart = (event: TouchEvent): void => { + if (event.targetTouches.length !== 1 || this._drawingStroke) { + return; + } + // Prevent scrolling. if (event.cancelable) { event.preventDefault(); } - if (event.targetTouches.length === 1) { - const touch = event.changedTouches[0]; - this._strokeBegin(touch); - } + this._strokeBegin(this._touchEventToSignatureEvent(event)); }; private _handleTouchMove = (event: TouchEvent): void => { + if (event.targetTouches.length !== 1) { + return; + } + // Prevent scrolling. if (event.cancelable) { event.preventDefault(); } - const touch = event.targetTouches[0]; - this._strokeMoveUpdate(touch); + if (!this._drawingStroke) { + this._strokeEnd(this._touchEventToSignatureEvent(event), false); + return; + } + + this._strokeMoveUpdate(this._touchEventToSignatureEvent(event)); }; private _handleTouchEnd = (event: TouchEvent): void => { - const wasCanvasTouched = event.target === this.canvas; - if (wasCanvasTouched) { - if (event.cancelable) { - event.preventDefault(); - } - const touch = event.changedTouches[0]; - this._strokeEnd(touch); + if (event.targetTouches.length !== 0) { + return; } + + if (event.cancelable) { + event.preventDefault(); + } + + this.canvas.removeEventListener('touchmove', this._handleTouchMove); + + this._strokeEnd(this._touchEventToSignatureEvent(event)); }; - private _handlePointerStart = (event: PointerEvent): void => { + private _handlePointerDown = (event: PointerEvent): void => { + if (!this._isLeftButtonPressed(event) || this._drawingStroke) { + return; + } + event.preventDefault(); - this._strokeBegin(event); + + this._strokeBegin(this._pointerEventToSignatureEvent(event)); }; private _handlePointerMove = (event: PointerEvent): void => { - this._strokeMoveUpdate(event); + if (!this._isLeftButtonPressed(event, true) || !this._drawingStroke) { + // Stop when primary button not pressed or multiple buttons pressed + this._strokeEnd(this._pointerEventToSignatureEvent(event), false); + return; + } + + event.preventDefault(); + this._strokeMoveUpdate(this._pointerEventToSignatureEvent(event)); }; - private _handlePointerEnd = (event: PointerEvent): void => { - if (this._drawingStroke) { - event.preventDefault(); - this._strokeEnd(event); + private _handlePointerUp = (event: PointerEvent): void => { + if (this._isLeftButtonPressed(event)) { + return; } + + event.preventDefault(); + this._strokeEnd(this._pointerEventToSignatureEvent(event)); }; private _getPointGroupOptions(group?: PointGroup): PointGroupOptions { @@ -349,6 +438,25 @@ export default class SignaturePad extends SignatureEventTarget { if (cancelled) { return; } + + const { addEventListener } = this._getListenerFunctions(); + switch (event.event.type) { + case 'mousedown': + addEventListener('mousemove', this._handleMouseMove); + addEventListener('mouseup', this._handleMouseUp); + break; + case 'touchstart': + addEventListener('touchmove', this._handleTouchMove); + addEventListener('touchend', this._handleTouchEnd); + break; + case 'pointerdown': + addEventListener('pointermove', this._handlePointerMove); + addEventListener('pointerup', this._handlePointerUp); + break; + default: + // do nothing + } + this._drawingStroke = true; const pointGroupOptions = this._getPointGroupOptions(); @@ -379,16 +487,7 @@ export default class SignaturePad extends SignatureEventTarget { new CustomEvent('beforeUpdateStroke', { detail: event }), ); - const x = event.clientX; - const y = event.clientY; - const pressure = - (event as PointerEvent).pressure !== undefined - ? (event as PointerEvent).pressure - : (event as Touch).force !== undefined - ? (event as Touch).force - : 0; - - const point = this._createPoint(x, y, pressure); + const point = this._createPoint(event.x, event.y, event.pressure); const lastPointGroup = this._data[this._data.length - 1]; const lastPoints = lastPointGroup.points; const lastPoint = @@ -419,12 +518,16 @@ export default class SignaturePad extends SignatureEventTarget { this.dispatchEvent(new CustomEvent('afterUpdateStroke', { detail: event })); } - private _strokeEnd(event: SignatureEvent): void { + private _strokeEnd(event: SignatureEvent, shouldUpdate = true): void { + this._removeMoveUpEventListeners(); + if (!this._drawingStroke) { return; } - this._strokeUpdate(event); + if (shouldUpdate) { + this._strokeUpdate(event); + } this._drawingStroke = false; this.dispatchEvent(new CustomEvent('endStroke', { detail: event })); @@ -433,26 +536,17 @@ export default class SignaturePad extends SignatureEventTarget { private _handlePointerEvents(): void { this._drawingStroke = false; - this.canvas.addEventListener('pointerdown', this._handlePointerStart); - this.canvas.addEventListener('pointermove', this._handlePointerMove); - this.canvas.ownerDocument.addEventListener( - 'pointerup', - this._handlePointerEnd, - ); + this.canvas.addEventListener('pointerdown', this._handlePointerDown); } private _handleMouseEvents(): void { this._drawingStroke = false; this.canvas.addEventListener('mousedown', this._handleMouseDown); - this.canvas.addEventListener('mousemove', this._handleMouseMove); - this.canvas.ownerDocument.addEventListener('mouseup', this._handleMouseUp); } private _handleTouchEvents(): void { this.canvas.addEventListener('touchstart', this._handleTouchStart); - this.canvas.addEventListener('touchmove', this._handleTouchMove); - this.canvas.addEventListener('touchend', this._handleTouchEnd); } // Called when a new line is started diff --git a/tests/signature_pad.test.ts b/tests/signature_pad.test.ts index 386b01e7..a54ad0f4 100644 --- a/tests/signature_pad.test.ts +++ b/tests/signature_pad.test.ts @@ -224,6 +224,14 @@ describe('user interactions', () => { clientX: 50, clientY: 30, pressure: 1, + buttons: 1, + }), + ); + window.dispatchEvent( + new PointerEvent('pointerup', { + clientX: 50, + clientY: 30, + pressure: 1, }), ); canvas.dispatchEvent( @@ -231,6 +239,14 @@ describe('user interactions', () => { clientX: 240, clientY: 30, pressure: 1, + buttons: 1, + }), + ); + window.dispatchEvent( + new PointerEvent('pointerup', { + clientX: 240, + clientY: 30, + pressure: 1, }), ); canvas.dispatchEvent( @@ -238,6 +254,14 @@ describe('user interactions', () => { clientX: 150, clientY: 120, pressure: 1, + buttons: 1, + }), + ); + window.dispatchEvent( + new PointerEvent('pointerup', { + clientX: 150, + clientY: 120, + pressure: 1, }), ); expect(pad.toDataURL('image/svg+xml')).toMatchSnapshot(); @@ -252,16 +276,18 @@ describe('user interactions', () => { clientX: 50, clientY: 30, pressure: 1, + buttons: 1, }), ); - canvas.dispatchEvent( + window.dispatchEvent( new PointerEvent('pointermove', { clientX: 240, clientY: 30, pressure: 1, + buttons: 1, }), ); - document.dispatchEvent( + window.dispatchEvent( new PointerEvent('pointerup', { clientX: 150, clientY: 120, @@ -290,6 +316,7 @@ describe('user interactions', () => { clientX: 50, clientY: 30, pressure: 1, + buttons: 1, }), ); externalCanvas.dispatchEvent( @@ -297,10 +324,11 @@ describe('user interactions', () => { clientX: 240, clientY: 30, pressure: 1, + buttons: 1, }), ); // check that original document is not affected - document.dispatchEvent( + window.dispatchEvent( new PointerEvent('pointerup', { clientX: 150, clientY: 120, @@ -337,7 +365,8 @@ describe(`touch events.`, () => { }); const touchMoveEvent = new TouchEvent('touchmove', { cancelable, - targetTouches: [ + targetTouches: [{} as Touch], + changedTouches: [ { clientX: 55, clientY: 35, @@ -376,8 +405,8 @@ describe(`touch events.`, () => { const { touchStartEvent, touchMoveEvent, touchEndEvent } = createTouchEvents(false); canvas.dispatchEvent(touchStartEvent); - canvas.dispatchEvent(touchMoveEvent); - canvas.dispatchEvent(touchEndEvent); + window.dispatchEvent(touchMoveEvent); + window.dispatchEvent(touchEndEvent); expect(touchStartEvent.preventDefault).not.toHaveBeenCalled(); expect(touchMoveEvent.preventDefault).not.toHaveBeenCalled(); @@ -388,8 +417,8 @@ describe(`touch events.`, () => { const { touchStartEvent, touchMoveEvent, touchEndEvent } = createTouchEvents(true); canvas.dispatchEvent(touchStartEvent); - canvas.dispatchEvent(touchMoveEvent); - canvas.dispatchEvent(touchEndEvent); + window.dispatchEvent(touchMoveEvent); + window.dispatchEvent(touchEndEvent); expect(touchStartEvent.preventDefault).toHaveBeenCalled(); expect(touchMoveEvent.preventDefault).toHaveBeenCalled(); @@ -428,6 +457,16 @@ describe('Signature events.', () => { }, ].forEach((param) => { describe(`${param.eventName}.`, () => { + function createPointerEvent(dispatchedEventName: string) { + return new PointerEvent(dispatchedEventName, { + clientX: 50, + clientY: 30, + pressure: 1, + buttons: dispatchedEventName == 'pointerup' ? 0 : 1, + bubbles: true, + }); + } + beforeEach(() => { signpad.addEventListener(param.eventName, eventHandler); }); @@ -441,15 +480,9 @@ describe('Signature events.', () => { }); it('writes to the canvas.', () => { - const eventInitObj = { - clientX: 50, - clientY: 30, - pressure: 1, - bubbles: true, - }; let pointerEvent; for (const dispatchedEventName of param.dispatchedEventName) { - pointerEvent = new PointerEvent(dispatchedEventName, eventInitObj); + pointerEvent = createPointerEvent(dispatchedEventName); canvas.dispatchEvent(pointerEvent); } @@ -457,7 +490,7 @@ describe('Signature events.', () => { expect(eventDispatched).toBeInstanceOf(CustomEvent); const event = eventDispatched; - expect(event.detail).toBe(pointerEvent); + expect(event.detail.event).toBe(pointerEvent); }); }); }); @@ -478,6 +511,7 @@ describe('Signature events.', () => { clientX: 50, clientY: 30, pressure: 1, + buttons: 1, }; const pointerEvent = new PointerEvent('pointerdown', eventInitObj); canvas.dispatchEvent(pointerEvent); @@ -486,7 +520,7 @@ describe('Signature events.', () => { expect(eventDispatched).toBeInstanceOf(CustomEvent); const event = eventDispatched; - expect(event.detail).toBe(pointerEvent); + expect(event.detail.event).toBe(pointerEvent); }); }); @@ -504,6 +538,7 @@ describe('Signature events.', () => { clientX: 50, clientY: 30, pressure: 1, + buttons: 1, }), ); canvas.dispatchEvent( @@ -511,9 +546,10 @@ describe('Signature events.', () => { clientX: 50, clientY: 40, pressure: 1, + buttons: 1, }), ); - document.dispatchEvent( + window.dispatchEvent( new PointerEvent('pointerup', { clientX: 50, clientY: 40,