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a=n-t,r=i-e;if(0===a)return{val:0,pos:-1};if(0===r)return{val:0,pos:1};var o=Math.abs(Math.atan(r/a));return n>t&&e>i||t>n&&i>e?{val:o,pos:1}:{val:o,pos:-1}},this.getRadianPoints=function(t,e,n,i){if(0===t.val)return 1===t.pos?[{x:e,y:n+i},{x:e,y:n-i}]:[{y:n,x:e+i},{y:n,x:e-i}];var a=Math.sin(t.val)*i,r=Math.cos(t.val)*i;return 1===t.pos?[{x:e+a,y:n+r},{x:e-a,y:n-r}]:[{x:e+a,y:n-r},{x:e-a,y:n+r}]},this.drawSmoothLine=function(t,e){var i=e.x-t.x,a=e.y-t.y;if(Math.abs(i)+Math.abs(a)>2?(e.lastX1=t.x+.3*i,e.lastY1=t.y+.3*a,e.lastX2=t.x+.7*i,e.lastY2=t.y+.7*a):(e.lastX1=e.lastX2=t.x+.5*i,e.lastY1=e.lastY2=t.y+.5*a),e.perLineWidth=(t.lineWidth+e.lineWidth)/2,"number"==typeof t.lastX1){if(n.drawCurveLine(t.lastX2,t.lastY2,t.x,t.y,e.lastX1,e.lastY1,e.perLineWidth),t.isFirstPoint)return;if(t.lastX1===t.lastX2&&t.lastY1===t.lastY2)return;var r=n.getRadianData(t.lastX1,t.lastY1,t.lastX2,t.lastY2),o=n.getRadianPoints(r,t.lastX1,t.lastY1,t.perLineWidth/2),s=n.getRadianPoints(r,t.lastX2,t.lastY2,e.perLineWidth/2);n.drawTrapezoid(o[0],s[0],s[1],o[1])}else e.isFirstPoint=!0},this.addHistory=function(){var t=n.get("options").maxHistoryLength;if(t&&n.canAddHistory)if(n.canAddHistory=!1,n.get("createImage")){var e=null;e=n.get("createImage")();var i=n.get("toDataURL")&&n.get("toDataURL")();w(i)?e.src=i:i.then((function(t){e.src=t})),e.onload=function(){var i=R;R=e,n.historyList.push(i),n.historyList=n.historyList.slice(-t)}}else n.historyList.length++},this.drawByImage=function(t){var e=n.get("context"),i=n.get("width"),a=n.get("height");e.clearRect(0,0,i,a);try{t&&e.drawImage(t,0,0,i,a),e.draw&&e.draw(!0)}catch(t){n.historyList.length=0}},this.isEmpty=function(){return n.get("options").maxHistoryLength>0?0===n.historyList.length:n._isEmpty},this.clear=function(){var t=n.get("context");t.clearRect(0,0,n.get("width"),n.get("height")),t.draw&&t.draw(),n._isEmpty=!0,R=null,n.historyList.length=0},this.undo=function(){if(0===n.get("options").maxHistoryLength&&n.clear(),n.get("createImage")&&n.historyList.length){var t=n.historyList.splice(-1)[0];n.drawByImage(t),0===n.historyList.length&&n.clear()}},this.canvas=e,this.canvas.set("pen",W),this.init()}return h(t,[{key:"getOption",value:function(){}},{key:"setOption",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},e=o({},t),n=e.maxLineWidth;if(n&&t.penSize&&n==W.maxLineWidth){var i=Math.max(n,t.penSize);e.maxLineWidth=i}this.canvas.set("pen",Object.assign({},W,e))}},{key:"get",value:function(t){return this.canvas.get("options"==t?"pen":t)}},{key:"init",value:function(){var t=this;this.get("context").lineCap="round",this.canvas.on("touchstart",(function(e){return t.onDrawStart(e)})),this.canvas.on("touchmove",(function(e){return t.onDrawMove(e)})),this.canvas.on("touchend",(function(e){return t.onDrawEnd(e)}))}},{key:"drawBackground",value:function(){var t=this.get("context"),e=this.get("width"),n=this.get("height"),i=this.get("options"),a=i.backgroundColor,r=i.backgroundImage;a&&(t.fillStyle=a,t.fillRect(0,0,e,n),t.draw&&t.draw(!0)),r&&this.drawByImage(r)}},{key:"getContentBoundingBox",value:function(t){var e=this.get("pixelRatio"),n=this.get("width"),i=this.get("height"),a=this.get("el"),r="CANVAS"===a.nodeName,o=r?n:a.width,s=r?i:a.height;e=r?1:e;var u=function(n){for(var i=o,a=s,r=0,u=0,c=0;n.length>c;c+=4)if(n[c+3]>0){var h=c/4%o,d=Math.floor(c/4/o);i=Math.min(i,h),a=Math.min(a,d),r=Math.max(r,h),u=Math.max(u,d)}var l={width:(r-i+1)/e,height:(u-a+1)/e,startX:i/e,startY:a/e};return t&&t(l),l};if("CANVAS"===a.nodeName){var c=document.createElement("canvas");c.width=n,c.height=i;var h=c.getContext("2d");h.drawImage(a,0,0,n,i);var d=h.getImageData(0,0,n,i).data;return u(d)}var l,f=this.get("context").getImageData(0,0,o,s);return m(l=f)&&S(l.then)&&S(l.catch)?(f.then((function(t){return u(t.data)})),null):u(f.data)}},{key:"remove",value:function(){var t=this;this.canvas.off("touchstart",(function(e){return t.onDrawStart(e)})),this.canvas.off("touchmove",(function(e){return t.onDrawMove(e)})),this.canvas.off("touchend",(function(e){return t.onDrawEnd(e)}))}},{key:"disableScroll",value:function(t){t.preventDefault&&this.get("options").disableScroll&&t.preventDefault()}},{key:"onDrawStart",value:function(t){this.disableScroll(t);var e=t.points;if(this.active){this.canAddHistory=!0,this.get("context").strokeStyle=this.get("options").penColor;var n=e[0];this.initPoint(n.x,n.y)}}},{key:"onDrawMove",value:function(t){if(this.disableScroll(t),this.active){var e=t.points[0];this.initPoint(e.x,e.y),this.onDraw()}}},{key:"onDrawEnd",value:function(t){this.active&&(this.addHistory(),this.canAddHistory=!0,this.points=[])}},{key:"onDraw",value:function(){var t=this,e=this.get("context");if(this.points.length>=2){e.lineWidth=this.get("options").penSize||2;var n=this.points.slice(-1)[0],i=this.points.slice(-2,-1)[0],a=function(){t._isEmpty=!1,t.get("options").openSmooth?t.drawSmoothLine(i,n):t.drawNoSmoothLine(i,n)},r=this.get("el").canvas;r&&r.requestAnimationFrame?r.requestAnimationFrame((function(){return a()})):"function"==typeof requestAnimationFrame?requestAnimationFrame((function(){return a()})):a()}}},{key:"getMaxLineWidth",value:function(){var t=this.get("options");return Math.min(t.penSize,t.maxLineWidth)}},{key:"initPoint",value:function(t,e){var n={x:t,y:e,t:Date.now()},i=this.points.slice(-1)[0];if(!i||i.t!==n.t&&(i.x!==t||i.y!==e)){if(this.get("options").openSmooth&&i){var a=this.points.slice(-2,-1)[0];if(n.distance=Math.sqrt(Math.pow(n.x-i.x,2)+Math.pow(n.y-i.y,2)),n.speed=n.distance/(n.t-i.t||.1),n.lineWidth=this.getLineWidth(n.speed),a&&a.lineWidth&&i.lineWidth){var r=(n.lineWidth-i.lineWidth)/i.lineWidth,o=this.get("options").maxWidthDiffRate/100;o=o>1?1:.01>o?.01:o,Math.abs(r)>o&&(n.lineWidth=i.lineWidth*(1+(r>0?o:-o)))}}this.points.push(n),this.points=this.points.slice(-3)}}}]),t}(),F=function(){function t(e){u(this,t),this.canvas=void 0,this._ee=void 0,this.pen=void 0;var n=new T(e);n.set("parent",this),this.canvas=n,this._ee=new _,this.pen=new I(n),this.init()}return h(t,[{key:"init",value:function(){this.pen.active=!0}},{key:"destroy",value:function(){this.canvas.destroy()}},{key:"clear",value:function(){this.pen.clear()}},{key:"undo",value:function(){this.pen.undo()}},{key:"save",value:function(){}},{key:"getContentBoundingBox",value:function(t){return this.pen.getContentBoundingBox(t)}},{key:"isEmpty",value:function(){return this.pen.isEmpty()}},{key:"on",value:function(t,e){this._ee.on(t,e)}},{key:"emit",value:function(t,e){this._ee.emit(t,e)}},{key:"off",value:function(t,e){this._ee.off(t,e)}}]),t}();e.Signature=F;var 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