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18 KiB
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r(t,[{key:"delegateEvent",value:function(t){t.addEventListener("click",this._click),t.addEventListener("touchstart",this._start),t.addEventListener("touchmove",this._move),t.addEventListener("touchend",this._end),t.addEventListener("touchcancel",this._cancel)}},{key:"emitEvent",value:function(t,e){this.canvas.emit(t,e)}},{key:"getEventType",value:function(t){var e,n=this.eventType,i=this.startTime,o=this.startPoints;if(n)return n;var r=this.canvas.__events.pan;if(r&&r.length){var a=Date.now();if(!o)return;e=a-i>250&&10>M(o[0],t[0])?"press":"pan"}else e="press";return this.eventType=e,e}},{key:"enable",value:function(t){this.processEvent[t]=!0}},{key:"isProcess",value:function(t){return this.processEvent[t]}},{key:"emitStart",value:function(t,e){this.isProcess(t)||(this.enable(t),this.emitEvent("".concat(t,"start"),e))}},{key:"emitEnd",value:function(t){}},{key:"clearPressTimeout",value:function(){this.pressTimeout&&(clearTimeout(this.pressTimeout),this.pressTimeout=null)}},{key:"reset",value:function(){this.clearPressTimeout(),this.startTime=0,this.startPoints=null,this.startDistance=0,this.direction=null,this.eventType=null,this.pinch=!1,this.prevMoveTime=0,this.prevMovePoints=null,this.lastMoveTime=0,this.lastMovePoints=null}}]),t}(),T=function(t){s(o,m);var e=l(o);function o(t){var n;i(this,o),(n=e.call(this))._attrs={},n._isWindow=void 0,n._attrs=Object.assign({},t),n._isWindow="undefined"!=typeof window,n._initPixelRatio(),n._initCanvas();return["createImage","toDataURL","requestAnimationFrame"].forEach((function(e){n._initAttrs(e,t.canvas||n.get("el"))})),n}return r(o,[{key:"get",value:function(t){return this._attrs[t]}},{key:"set",value:function(t,e){this._attrs[t]=e}},{key:"_initAttrs",value:function(t,e){var n=this;if(!this.get(t)){this.set(t,(function(){return e[t]?e[t].apply(e,arguments):n._isWindow?window[t]?(i=window)[t].apply(i,arguments):"createImage"==t?new Image:null:void 0;var i}))}}},{key:"_initCanvas",value:function(){var t,e,n=this.get("el"),i=this.get("context");if(!n&&!i)throw Error("请指定 id、el 或 context!");t=n?y(n)?(e=n)?document.getElementById(e):null:n:w(i,this._attrs),i&&t&&!t.getContext&&(t.getContext=function(){return i});var o=this.get("width")||function(t){var e=b(t,"width");return"auto"===e&&(e=t.offsetWidth),parseFloat(e)}(t)||t.width,r=this.get("height")||function(t){var e=b(t,"height");return"auto"===e&&(e=t.offsetHeight),parseFloat(e)}(t)||t.height;this.set("canvas",this),this.set("el",t),this.set("context",i||t.getContext("2d")),this.changeSize(o,r);var a=new P({canvas:this,el:t,parent:this.get("parent")});this.set("eventController",a)}},{key:"_initPixelRatio",value:function(){this.get("pixelRatio")||this.set("pixelRatio",window&&window.devicePixelRatio||1)}},{key:"changeSize",value:function(t,e){var i,o=this.get("pixelRatio"),r=this.get("el");(r.style&&(r.style.width=t+"px",r.style.height=e+"px"),(i=r)&&"object"===n(i)&&(1===i.nodeType&&i.nodeName||i.isCanvasElement))&&(r.width=t*o,r.height=e*o,1!==o&&this.get("context").scale(o,o));this.set("width",t),this.set("height",e)}},{key:"destroy",value:function(){if(!this.get("destroyed")){var t=this.get("el");t.width=0,t.height=0,this.clear(),this._attrs={},this.set("destroyed",!0)}}},{key:"clear",value:function(){}},{key:"isDestroyed",value:function(){return this.get("destroyed")}}]),o}();var S={penColor:"black",backgroundColor:"",openSmooth:!0,penSize:2,minLineWidth:2,maxLineWidth:6,minSpeed:1.5,maxWidthDiffRate:20,maxHistoryLength:20},D=null,O=function(){function t(e){var n=this;i(this,t),this.canAddHistory=!0,this.points=[],this.historyList=[],this.canvas=void 0,this._isEmpty=!0,this.active=!1,this.getLineWidth=function(t){var e=n.get("options"),i=e.minSpeed,o=e.minLineWidth,r=n.getMaxLineWidth();return Math.min(Math.max(r-(r-o)*t/Math.max(Math.min(i,10),1),o),r)},this.drawTrapezoid=function(t,e,i,o){var r=n.get("context");r.beginPath(),r.moveTo(Number(t.x.toFixed(1)),Number(t.y.toFixed(1))),r.lineTo(Number(e.x.toFixed(1)),Number(e.y.toFixed(1))),r.lineTo(Number(i.x.toFixed(1)),Number(i.y.toFixed(1))),r.lineTo(Number(o.x.toFixed(1)),Number(o.y.toFixed(1))),r.fillStyle=n.get("options").penColor,r.fill(),r.draw&&r.draw(!0)},this.drawNoSmoothLine=function(t,e){e.lastX=t.x+.5*(e.x-t.x),e.lastY=t.y+.5*(e.y-t.y),"number"==typeof t.lastX&&n.drawCurveLine(t.lastX,t.lastY,t.x,t.y,e.lastX,e.lastY,n.getMaxLineWidth())},this.drawCurveLine=function(t,e,i,o,r,a,s){s=Number(s.toFixed(1));var u=n.get("context");u.lineWidth=s,u.beginPath(),u.moveTo(Number(t.toFixed(1)),Number(e.toFixed(1))),u.quadraticCurveTo(Number(i.toFixed(1)),Number(o.toFixed(1)),Number(r.toFixed(1)),Number(a.toFixed(1))),u.stroke(),u.draw&&u.draw(!0)},this.getRadianData=function(t,e,n,i){var o=n-t,r=i-e;if(0===o)return{val:0,pos:-1};if(0===r)return{val:0,pos:1};var a=Math.abs(Math.atan(r/o));return n>t&&e>i||t>n&&i>e?{val:a,pos:1}:{val:a,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 o=Math.sin(t.val)*i,r=Math.cos(t.val)*i;return 1===t.pos?[{x:e+o,y:n+r},{x:e-o,y:n-r}]:[{x:e+o,y:n-r},{x:e-o,y:n+r}]},this.drawSmoothLine=function(t,e){var i=e.x-t.x,o=e.y-t.y;if(Math.abs(i)+Math.abs(o)>2?(e.lastX1=t.x+.3*i,e.lastY1=t.y+.3*o,e.lastX2=t.x+.7*i,e.lastY2=t.y+.7*o):(e.lastX1=e.lastX2=t.x+.5*i,e.lastY1=e.lastY2=t.y+.5*o),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),a=n.getRadianPoints(r,t.lastX1,t.lastY1,t.perLineWidth/2),s=n.getRadianPoints(r,t.lastX2,t.lastY2,e.perLineWidth/2);n.drawTrapezoid(a[0],s[0],s[1],a[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")();y(i)?e.src=i:i.then((function(t){e.src=t})),e.onload=function(){var i=D;D=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"),o=n.get("height");e.clearRect(0,0,i,o);try{t&&e.drawImage(t,0,0,i,o),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,D=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",S),this.init()}return r(t,[{key:"getOption",value:function(){}},{key:"setOption",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},n=e({},t),i=n.maxLineWidth;if(i&&t.penSize&&i==S.maxLineWidth){var o=Math.max(i,t.penSize);n.maxLineWidth=o}this.canvas.set("pen",Object.assign({},S,n))}},{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"),o=i.backgroundColor,r=i.backgroundImage;o&&(t.fillStyle=o,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"),o=this.get("el"),r="CANVAS"===o.nodeName,a=r?n:o.width,s=r?i:o.height;e=r?1:e;var u=function(n){for(var i=a,o=s,r=0,u=0,h=0;n.length>h;h+=4){if(n[h+3]>0){var c=h/4%a,l=Math.floor(h/4/a);i=Math.min(i,c),o=Math.min(o,l),r=Math.max(r,c),u=Math.max(u,l)}}var v={width:(r-i+1)/e,height:(u-o+1)/e,startX:i/e,startY:o/e};return t&&t(v),v};if("CANVAS"===o.nodeName){var h=document.createElement("canvas");h.width=n,h.height=i;var c=h.getContext("2d");c.drawImage(o,0,0,n,i);var l=c.getImageData(0,0,n,i).data;return u(l)}var f,d=this.get("context").getImageData(0,0,a,s);return v(f=d)&&g(f.then)&&g(f.catch)?(d.then((function(t){return u(t.data)})),null):u(d.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],o=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 o()})):"function"==typeof requestAnimationFrame?requestAnimationFrame((function(){return o()})):o()}}},{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 o=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),o&&o.lineWidth&&i.lineWidth){var r=(n.lineWidth-i.lineWidth)/i.lineWidth,a=this.get("options").maxWidthDiffRate/100;if(a=a>1?1:.01>a?.01:a,Math.abs(r)>a)n.lineWidth=i.lineWidth*(1+(r>0?a:-a))}}this.points.push(n),this.points=this.points.slice(-3)}}}]),t}(),W=function(){function t(e){i(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 m,this.pen=new O(n),this.init()}return r(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}();export default W;export{W as Signature};
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