7 lines
9.1 KiB
JavaScript
7 lines
9.1 KiB
JavaScript
/*!
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* Signature Pad v3.0.0-beta.4 | https://github.com/szimek/signature_pad
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* (c) 2020 Szymon Nowak | Released under the MIT license
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*/
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class t{constructor(t,e,i){this.x=t,this.y=e,this.time=i||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.time===t.time}velocityFrom(t){return this.time!==t.time?this.distanceTo(t)/(this.time-t.time):0}}class e{constructor(t,e,i,o,s,n){this.startPoint=t,this.control2=e,this.control1=i,this.endPoint=o,this.startWidth=s,this.endWidth=n}static fromPoints(t,i){const o=this.calculateControlPoints(t[0],t[1],t[2]).c2,s=this.calculateControlPoints(t[1],t[2],t[3]).c1;return new e(t[1],o,s,t[2],i.start,i.end)}static calculateControlPoints(e,i,o){const s=e.x-i.x,n=e.y-i.y,h=i.x-o.x,a=i.y-o.y,r=(e.x+i.x)/2,c=(e.y+i.y)/2,l=(i.x+o.x)/2,d=(i.y+o.y)/2,u=Math.sqrt(s*s+n*n),v=Math.sqrt(h*h+a*a),_=v/(u+v),m=l+(r-l)*_,p=d+(c-d)*_,w=i.x-m,g=i.y-p;return{c1:new t(r+w,c+g),c2:new t(l+w,d+g)}}length(){let t,e,i=0;for(let o=0;o<=10;o+=1){const s=o/10,n=this.point(s,this.startPoint.x,this.control1.x,this.control2.x,this.endPoint.x),h=this.point(s,this.startPoint.y,this.control1.y,this.control2.y,this.endPoint.y);if(o>0){const o=n-t,s=h-e;i+=Math.sqrt(o*o+s*s)}t=n,e=h}return i}point(t,e,i,o,s){return e*(1-t)*(1-t)*(1-t)+3*i*(1-t)*(1-t)*t+3*o*(1-t)*t*t+s*t*t*t}}class i{constructor(t,e={}){this.canvas=t,this.options=e,this._handleMouseDown=t=>{1===t.which&&(this._mouseButtonDown=!0,this._strokeBegin(t))},this._handleMouseMove=t=>{this._mouseButtonDown&&this._strokeMoveUpdate(t)},this._handleMouseUp=t=>{1===t.which&&this._mouseButtonDown&&(this._mouseButtonDown=!1,this._strokeEnd(t))},this._handleTouchStart=t=>{if(t.preventDefault(),1===t.targetTouches.length){const e=t.changedTouches[0];this._strokeBegin(e)}},this._handleTouchMove=t=>{t.preventDefault();const e=t.targetTouches[0];this._strokeMoveUpdate(e)},this._handleTouchEnd=t=>{if(t.target===this.canvas){t.preventDefault();const e=t.changedTouches[0];this._strokeEnd(e)}},this.velocityFilterWeight=e.velocityFilterWeight||.7,this.minWidth=e.minWidth||.5,this.maxWidth=e.maxWidth||2.5,this.throttle="throttle"in e?e.throttle:16,this.minDistance="minDistance"in e?e.minDistance:5,this.dotSize=e.dotSize||function(){return(this.minWidth+this.maxWidth)/2},this.penColor=e.penColor||"black",this.backgroundColor=e.backgroundColor||"rgba(0,0,0,0)",this.onBegin=e.onBegin,this.onEnd=e.onEnd,this._strokeMoveUpdate=this.throttle?function(t,e=250){let i,o,s,n=0,h=null;const a=()=>{n=Date.now(),h=null,i=t.apply(o,s),h||(o=null,s=[])};return function(...r){const c=Date.now(),l=e-(c-n);return o=this,s=r,l<=0||l>e?(h&&(clearTimeout(h),h=null),n=c,i=t.apply(o,s),h||(o=null,s=[])):h||(h=window.setTimeout(a,l)),i}}(i.prototype._strokeUpdate,this.throttle):i.prototype._strokeUpdate,this._ctx=t.getContext("2d"),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._isEmpty=!0}fromDataURL(t,e={},i){const o=new Image,s=e.ratio||window.devicePixelRatio||1,n=e.width||this.canvas.width/s,h=e.height||this.canvas.height/s;this._reset(),o.onload=()=>{this._ctx.drawImage(o,0,0,n,h),i&&i()},o.onerror=t=>{i&&i(t)},o.src=t,this._isEmpty=!1}toDataURL(t="image/png",e){switch(t){case"image/svg+xml":return this._toSVG();default:return this.canvas.toDataURL(t,e)}}on(){this.canvas.style.touchAction="none",this.canvas.style.msTouchAction="none",window.PointerEvent?this._handlePointerEvents():(this._handleMouseEvents(),"ontouchstart"in window&&this._handleTouchEvents())}off(){this.canvas.style.touchAction="auto",this.canvas.style.msTouchAction="auto",this.canvas.removeEventListener("pointerdown",this._handleMouseDown),this.canvas.removeEventListener("pointermove",this._handleMouseMove),document.removeEventListener("pointerup",this._handleMouseUp),this.canvas.removeEventListener("mousedown",this._handleMouseDown),this.canvas.removeEventListener("mousemove",this._handleMouseMove),document.removeEventListener("mouseup",this._handleMouseUp),this.canvas.removeEventListener("touchstart",this._handleTouchStart),this.canvas.removeEventListener("touchmove",this._handleTouchMove),this.canvas.removeEventListener("touchend",this._handleTouchEnd)}isEmpty(){return this._isEmpty}fromData(t){this.clear(),this._fromData(t,({color:t,curve:e})=>this._drawCurve({color:t,curve:e}),({color:t,point:e})=>this._drawDot({color:t,point:e})),this._data=t}toData(){return this._data}_strokeBegin(t){const e={color:this.penColor,points:[]};"function"==typeof this.onBegin&&this.onBegin(t),this._data.push(e),this._reset(),this._strokeUpdate(t)}_strokeUpdate(t){if(0===this._data.length)return void this._strokeBegin(t);const e=t.clientX,i=t.clientY,o=this._createPoint(e,i),s=this._data[this._data.length-1],n=s.points,h=n.length>0&&n[n.length-1],a=!!h&&o.distanceTo(h)<=this.minDistance,r=s.color;if(!h||!h||!a){const t=this._addPoint(o);h?t&&this._drawCurve({color:r,curve:t}):this._drawDot({color:r,point:o}),n.push({time:o.time,x:o.x,y:o.y})}}_strokeEnd(t){this._strokeUpdate(t),"function"==typeof this.onEnd&&this.onEnd(t)}_handlePointerEvents(){this._mouseButtonDown=!1,this.canvas.addEventListener("pointerdown",this._handleMouseDown),this.canvas.addEventListener("pointermove",this._handleMouseMove),document.addEventListener("pointerup",this._handleMouseUp)}_handleMouseEvents(){this._mouseButtonDown=!1,this.canvas.addEventListener("mousedown",this._handleMouseDown),this.canvas.addEventListener("mousemove",this._handleMouseMove),document.addEventListener("mouseup",this._handleMouseUp)}_handleTouchEvents(){this.canvas.addEventListener("touchstart",this._handleTouchStart),this.canvas.addEventListener("touchmove",this._handleTouchMove),this.canvas.addEventListener("touchend",this._handleTouchEnd)}_reset(){this._lastPoints=[],this._lastVelocity=0,this._lastWidth=(this.minWidth+this.maxWidth)/2,this._ctx.fillStyle=this.penColor}_createPoint(e,i){const o=this.canvas.getBoundingClientRect();return new t(e-o.left,i-o.top,(new Date).getTime())}_addPoint(t){const{_lastPoints:i}=this;if(i.push(t),i.length>2){3===i.length&&i.unshift(i[0]);const t=this._calculateCurveWidths(i[1],i[2]),o=e.fromPoints(i,t);return i.shift(),o}return null}_calculateCurveWidths(t,e){const i=this.velocityFilterWeight*e.velocityFrom(t)+(1-this.velocityFilterWeight)*this._lastVelocity,o=this._strokeWidth(i),s={end:o,start:this._lastWidth};return this._lastVelocity=i,this._lastWidth=o,s}_strokeWidth(t){return Math.max(this.maxWidth/(t+1),this.minWidth)}_drawCurveSegment(t,e,i){const o=this._ctx;o.moveTo(t,e),o.arc(t,e,i,0,2*Math.PI,!1),this._isEmpty=!1}_drawCurve({color:t,curve:e}){const i=this._ctx,o=e.endWidth-e.startWidth,s=2*Math.floor(e.length());i.beginPath(),i.fillStyle=t;for(let t=0;t<s;t+=1){const i=t/s,n=i*i,h=n*i,a=1-i,r=a*a,c=r*a;let l=c*e.startPoint.x;l+=3*r*i*e.control1.x,l+=3*a*n*e.control2.x,l+=h*e.endPoint.x;let d=c*e.startPoint.y;d+=3*r*i*e.control1.y,d+=3*a*n*e.control2.y,d+=h*e.endPoint.y;const u=Math.min(e.startWidth+h*o,this.maxWidth);this._drawCurveSegment(l,d,u)}i.closePath(),i.fill()}_drawDot({color:t,point:e}){const i=this._ctx,o="function"==typeof this.dotSize?this.dotSize():this.dotSize;i.beginPath(),this._drawCurveSegment(e.x,e.y,o),i.closePath(),i.fillStyle=t,i.fill()}_fromData(e,i,o){for(const s of e){const{color:e,points:n}=s;if(n.length>1)for(let o=0;o<n.length;o+=1){const s=n[o],h=new t(s.x,s.y,s.time);this.penColor=e,0===o&&this._reset();const a=this._addPoint(h);a&&i({color:e,curve:a})}else this._reset(),o({color:e,point:n[0]})}}_toSVG(){const t=this._data,e=Math.max(window.devicePixelRatio||1,1),i=this.canvas.width/e,o=this.canvas.height/e,s=document.createElementNS("http://www.w3.org/2000/svg","svg");s.setAttribute("width",this.canvas.width.toString()),s.setAttribute("height",this.canvas.height.toString()),this._fromData(t,({color:t,curve:e})=>{const i=document.createElement("path");if(!(isNaN(e.control1.x)||isNaN(e.control1.y)||isNaN(e.control2.x)||isNaN(e.control2.y))){const o=`M ${e.startPoint.x.toFixed(3)},${e.startPoint.y.toFixed(3)} C ${e.control1.x.toFixed(3)},${e.control1.y.toFixed(3)} ${e.control2.x.toFixed(3)},${e.control2.y.toFixed(3)} ${e.endPoint.x.toFixed(3)},${e.endPoint.y.toFixed(3)}`;i.setAttribute("d",o),i.setAttribute("stroke-width",(2.25*e.endWidth).toFixed(3)),i.setAttribute("stroke",t),i.setAttribute("fill","none"),i.setAttribute("stroke-linecap","round"),s.appendChild(i)}},({color:t,point:e})=>{const i=document.createElement("circle"),o="function"==typeof this.dotSize?this.dotSize():this.dotSize;i.setAttribute("r",o.toString()),i.setAttribute("cx",e.x.toString()),i.setAttribute("cy",e.y.toString()),i.setAttribute("fill",t),s.appendChild(i)});const n=`<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 ${i} ${o}" width="${i}" height="${o}">`;let h=s.innerHTML;if(void 0===h){const t=document.createElement("dummy"),e=s.childNodes;t.innerHTML="";for(let i=0;i<e.length;i+=1)t.appendChild(e[i].cloneNode(!0));h=t.innerHTML}return"data:image/svg+xml;base64,"+btoa(n+h+"</svg>")}}export default i;
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//# sourceMappingURL=signature_pad.min.js.map
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