2 lines
18 KiB
JavaScript
2 lines
18 KiB
JavaScript
function t(t,e){var i=Object.keys(t);if(Object.getOwnPropertySymbols){var n=Object.getOwnPropertySymbols(t);e&&(n=n.filter((function(e){return Object.getOwnPropertyDescriptor(t,e).enumerable}))),i.push.apply(i,n)}return i}function e(e){for(var i=1;arguments.length>i;i++){var n=null!=arguments[i]?arguments[i]:{};i%2?t(Object(n),!0).forEach((function(t){s(e,t,n[t])})):Object.getOwnPropertyDescriptors?Object.defineProperties(e,Object.getOwnPropertyDescriptors(n)):t(Object(n)).forEach((function(t){Object.defineProperty(e,t,Object.getOwnPropertyDescriptor(n,t))}))}return e}function i(t){return i="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t},i(t)}function n(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}function o(t,e){for(var i=0;e.length>i;i++){var n=e[i];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(t,n.key,n)}}function r(t,e,i){return e&&o(t.prototype,e),i&&o(t,i),Object.defineProperty(t,"prototype",{writable:!1}),t}function s(t,e,i){return e in t?Object.defineProperty(t,e,{value:i,enumerable:!0,configurable:!0,writable:!0}):t[e]=i,t}function a(t,e){if("function"!=typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function");t.prototype=Object.create(e&&e.prototype,{constructor:{value:t,writable:!0,configurable:!0}}),Object.defineProperty(t,"prototype",{writable:!1}),e&&u(t,e)}function c(t){return c=Object.setPrototypeOf?Object.getPrototypeOf:function(t){return t.__proto__||Object.getPrototypeOf(t)},c(t)}function u(t,e){return u=Object.setPrototypeOf||function(t,e){return t.__proto__=e,t},u(t,e)}function h(t,e){if(e&&("object"==typeof e||"function"==typeof e))return e;if(void 0!==e)throw new TypeError("Derived constructors may only return object or undefined");return function(t){if(void 0===t)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return t}(t)}function l(t){var e=function(){if("undefined"==typeof Reflect||!Reflect.construct)return!1;if(Reflect.construct.sham)return!1;if("function"==typeof Proxy)return!0;try{return Boolean.prototype.valueOf.call(Reflect.construct(Boolean,[],(function(){}))),!0}catch(t){return!1}}();return function(){var i,n=c(t);if(e){var o=c(this).constructor;i=Reflect.construct(n,arguments,o)}else i=n.apply(this,arguments);return h(this,i)}}var v={}.toString,f=function(t,e){return v.call(t)==="[object "+e+"]"},d=function(t){return f(t,"String")},y=function(t){return f(t,"Number")},p=function(){function t(){n(this,t),this.__events=void 0,this.__events={}}return r(t,[{key:"on",value:function(t,e){if(t&&e){var i=this.__events[t]||[];i.push(e),this.__events[t]=i}}},{key:"emit",value:function(t,e){var n=this;if(function(t){var e=i(t);return null!==t&&"object"===e||"function"===e}(t)&&(t=(e=t)&&e.type),t){var o=this.__events[t];o&&o.length&&o.forEach((function(t){t.call(n,e)}))}}},{key:"off",value:function(t,e){var i=this.__events,n=i[t];if(n&&n.length)if(e)for(var o=0,r=n.length;r>o;o++)n[o]===e&&(n.splice(o,1),o--);else delete i[t]}},{key:"getEvents",value:function(){return this.__events}}]),t}(),g=function(t){a(i,p);var e=l(i);function i(t,o){var r;return n(this,i),(r=e.call(this)).context=void 0,r.canvas=void 0,r.attrs=void 0,r.isCanvasElement=void 0,r.context=t,r.canvas=o.canvas||t.canvas||{width:o.width||0,height:o.height||0},r.attrs=o||{},r.isCanvasElement=!0,r}return r(i,[{key:"width",get:function(){return this.canvas.width},set:function(t){this.canvas.width=t}},{key:"height",get:function(){return this.canvas.height},set:function(t){this.canvas.height=t}},{key:"getContext",value:function(){return this.context}},{key:"getBoundingClientRect",value:function(){var t=this.attrs||{},e=t.top,i=t.right,n=t.width,o=t.height,r=t.left,s=t.bottom;return{top:void 0===e?0:e,width:void 0===n?0:n,right:void 0===i?0:i,height:void 0===o?0:o,bottom:void 0===s?0:s,left:void 0===r?0:r}}},{key:"setAttribute",value:function(t,e){this.attrs[t]=e}},{key:"addEventListener",value:function(t,e){this.on(t,e)}},{key:"removeEventListener",value:function(t,e){this.off(t,e)}},{key:"dispatchEvent",value:function(t,e){this.emit(t,e)}}]),i}();var m=function(t,e){return t?function(t){if(!t)return!1;if(1!==t.nodeType||!t.nodeName||"canvas"!==t.nodeName.toLowerCase())return!1;var e=!1;try{t.addEventListener("eventTest",(function(){e=!0})),t.dispatchEvent(new Event("eventTest"))}catch(t){e=!1}return e}(t.canvas)?t.canvas:new g(t,e):null};function x(t,e){try{return t.currentStyle?t.currentStyle[e]:document.defaultView&&document.defaultView.getComputedStyle(t,null).getPropertyValue(e)}catch(t){return{width:300,height:150}[e]}}function w(t,e){var i=e.get("el");if(!i)return t;var n=i.getBoundingClientRect(),o=n.top,r=void 0===o?0:o,s=n.left,a=void 0===s?0:s,c=parseFloat(x(i,"padding-left"))||0,u=parseFloat(x(i,"padding-top"))||0;return{x:t.x-a-c,y:t.y-r-u}}function b(t,e){var i=e.get("landscape");if(!i)return t;if(f(i,"Function"))return i(t,e);var n=e.get("height");return{x:t.y,y:n-t.x}}var k=function(t,e){var i=t.touches;if(!i||!i.length)return[b(w({x:t.clientX,y:t.clientY},e),e)];i.length||(i=t.changedTouches||[]);for(var n=[],o=0,r=i.length;r>o;o++){var s=i[o],a=s.x,c=s.y,u=s.clientX,h=s.clientY,l=void 0;l=y(a)||y(c)?{x:a,y:c}:w({x:u,y:h},e),n.push(b(l,e))}return n},_=function(t,e){var i=e.x-t.x,n=e.y-t.y;return Math.abs(i)>Math.abs(n)?i>0?"right":"left":n>0?"down":"up"},E=function(t,e){var i=Math.abs(e.x-t.x),n=Math.abs(e.y-t.y);return Math.sqrt(i*i+n*n)},L=function(){function t(e){var i=this,o=e.canvas,r=e.el;n(this,t),this.processEvent=void 0,this.canvas=void 0,this.startTime=0,this.endTime=0,this.startPoints=null,this.startDistance=0,this.center=null,this.pressTimeout=void 0,this.eventType=null,this.direction=null,this.lastMoveTime=0,this.prevMovePoints=null,this.prevMoveTime=0,this.lastMovePoints=null,this.pinch=!1,this._click=function(t){var e=k(t,i.canvas);t.points=e,i.emitEvent("click",t)},this._start=function(t){var e,n,o=k(t,i.canvas);o&&(t.points=o,i.emitEvent("touchstart",t),i.reset(),i.startTime=Date.now(),i.startPoints=o,o.length>1?(i.startDistance=E(o[0],o[1]),i.center={x:(e=o[0]).x+((n=o[1]).x-e.x)/2,y:e.y+(n.y-e.y)/2}):i.pressTimeout=setTimeout((function(){var e="press",n="none";t.direction=n,i.emitStart(e,t),i.emitEvent(e,t),i.eventType=e,i.direction=n}),250))},this._move=function(t){var e=k(t,i.canvas);if(e){t.points=e,i.emitEvent("touchmove",t);var n=i.startPoints;if(n)if(e.length>1){var o=i.startDistance,r=E(e[0],e[1]);t.zoom=r/o,t.center=i.center,i.emitStart("pinch",t),i.emitEvent("pinch",t)}else{var s=e[0].x-n[0].x,a=e[0].y-n[0].y,c=i.direction||_(n[0],e[0]);i.direction=c;var u=i.getEventType(e);t.direction=c,t.deltaX=s,t.deltaY=a,i.emitStart(u,t),i.emitEvent(u,t);var h=i.lastMoveTime,l=Date.now();l-h>0&&(i.prevMoveTime=h,i.prevMovePoints=i.lastMovePoints,i.lastMoveTime=l,i.lastMovePoints=e)}}},this._end=function(t){var e=k(t,i.canvas);t.points=e,i.emitEnd(t),i.emitEvent("touchend",t);var n=i.lastMoveTime;if(100>Date.now()-n){var o=n-(i.prevMoveTime||i.startTime);if(o>0){var r=i.prevMovePoints||i.startPoints,s=i.lastMovePoints;if(!r||!s)return;var a=E(r[0],s[0])/o;a>.3&&(t.velocity=a,t.direction=_(r[0],s[0]),i.emitEvent("swipe",t))}}i.reset();var c=t.touches;c&&c.length>0&&i._start(t)},this._cancel=function(t){i.emitEvent("touchcancel",t),i.reset()},this.canvas=o,this.delegateEvent(r),this.processEvent={}}return 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,i=this.eventType,n=this.startTime,o=this.startPoints;if(i)return i;var r=this.canvas.__events.pan;if(r&&r.length){var s=Date.now();if(!o)return;e=s-n>250&&10>E(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}(),P=function(t){a(o,p);var e=l(o);function o(t){var i;n(this,o),(i=e.call(this))._attrs={},i._isWindow=void 0,i._attrs=Object.assign({},t),i._isWindow="undefined"!=typeof window,i._initPixelRatio(),i._initCanvas();return["createImage","toDataURL","requestAnimationFrame"].forEach((function(e){i._initAttrs(e,t.canvas||i.get("el"))})),i}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 i=this;if(!this.get(t)){this.set(t,(function(){return e[t]?e[t].apply(e,arguments):i._isWindow?window[t]?(n=window)[t].apply(n,arguments):"createImage"==t?new Image:null:void 0;var n}))}}},{key:"_initCanvas",value:function(){var t,e,i=this.get("el"),n=this.get("context");if(!i&&!n)throw Error("请指定 id、el 或 context!");t=i?d(i)?(e=i)?document.getElementById(e):null:i:m(n,this._attrs),n&&t&&!t.getContext&&(t.getContext=function(){return n});var o=this.get("width")||function(t){var e=x(t,"width");return"auto"===e&&(e=t.offsetWidth),parseFloat(e)}(t)||t.width,r=this.get("height")||function(t){var e=x(t,"height");return"auto"===e&&(e=t.offsetHeight),parseFloat(e)}(t)||t.height;this.set("canvas",this),this.set("el",t),this.set("context",n||t.getContext("2d")),this.changeSize(o,r);var s=new L({canvas:this,el:t,parent:this.get("parent")});this.set("eventController",s)}},{key:"_initPixelRatio",value:function(){this.get("pixelRatio")||this.set("pixelRatio",window&&window.devicePixelRatio||1)}},{key:"changeSize",value:function(t,e){var n,o=this.get("pixelRatio"),r=this.get("el");(r.style&&(r.style.width=t+"px",r.style.height=e+"px"),(n=r)&&"object"===i(n)&&(1===n.nodeType&&n.nodeName||n.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 T={penColor:"black",backgroundColor:"",openSmooth:!0,penSize:2,minLineWidth:2,maxLineWidth:6,minSpeed:1.5,maxWidthDiffRate:20,maxHistoryLength:20},M=function(){function t(e){var i=this;n(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=i.get("options"),n=e.minSpeed,o=e.minLineWidth,r=i.getMaxLineWidth();return Math.min(Math.max(r-(r-o)*t/Math.max(Math.min(n,10),1),o),r)},this.drawTrapezoid=function(t,e,n,o){var r=i.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(n.x.toFixed(1)),Number(n.y.toFixed(1))),r.lineTo(Number(o.x.toFixed(1)),Number(o.y.toFixed(1))),r.fillStyle=i.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&&i.drawCurveLine(t.lastX,t.lastY,t.x,t.y,e.lastX,e.lastY,i.getMaxLineWidth())},this.drawCurveLine=function(t,e,n,o,r,s,a){a=Number(a.toFixed(1));var c=i.get("context");c.lineWidth=a,c.beginPath(),c.moveTo(Number(t.toFixed(1)),Number(e.toFixed(1))),c.quadraticCurveTo(Number(n.toFixed(1)),Number(o.toFixed(1)),Number(r.toFixed(1)),Number(s.toFixed(1))),c.stroke(),c.draw&&c.draw(!0)},this.getRadianData=function(t,e,i,n){var o=i-t,r=n-e;if(0===o)return{val:0,pos:-1};if(0===r)return{val:0,pos:1};var s=Math.abs(Math.atan(r/o));return i>t&&e>n||t>i&&n>e?{val:s,pos:1}:{val:s,pos:-1}},this.getRadianPoints=function(t,e,i,n){if(0===t.val)return 1===t.pos?[{x:e,y:i+n},{x:e,y:i-n}]:[{y:i,x:e+n},{y:i,x:e-n}];var o=Math.sin(t.val)*n,r=Math.cos(t.val)*n;return 1===t.pos?[{x:e+o,y:i+r},{x:e-o,y:i-r}]:[{x:e+o,y:i-r},{x:e-o,y:i+r}]},this.drawSmoothLine=function(t,e){var n=e.x-t.x,o=e.y-t.y;if(Math.abs(n)+Math.abs(o)>2?(e.lastX1=t.x+.3*n,e.lastY1=t.y+.3*o,e.lastX2=t.x+.7*n,e.lastY2=t.y+.7*o):(e.lastX1=e.lastX2=t.x+.5*n,e.lastY1=e.lastY2=t.y+.5*o),e.perLineWidth=(t.lineWidth+e.lineWidth)/2,"number"==typeof t.lastX1){if(i.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=i.getRadianData(t.lastX1,t.lastY1,t.lastX2,t.lastY2),s=i.getRadianPoints(r,t.lastX1,t.lastY1,t.perLineWidth/2),a=i.getRadianPoints(r,t.lastX2,t.lastY2,e.perLineWidth/2);i.drawTrapezoid(s[0],a[0],a[1],s[1])}else e.isFirstPoint=!0},this.addHistory=function(){var t=i.get("options").maxHistoryLength;if(t&&i.canAddHistory)if(i.canAddHistory=!1,i.get("createImage")){var e=null;e=i.get("createImage")();var n=i.get("toDataURL")&&i.get("toDataURL")();d(n)?e.src=n:n.then((function(t){e.src=t})),e.onload=function(){i.historyList.push(e),i.historyList=i.historyList.slice(-t)}}else i.historyList.length++},this.drawByImage=function(t){var e=i.get("context"),n=i.get("width"),o=i.get("height");e.clearRect(0,0,n,o);try{e.drawImage(t,0,0,n,o),e.draw&&e.draw(!0)}catch(t){i.historyList.length=0}},this.isEmpty=function(){return i.get("options").maxHistoryLength>0?0===i.historyList.length:i._isEmpty},this.clear=function(){var t=i.get("context");t.clearRect(0,0,i.get("width"),i.get("height")),t.draw&&t.draw(),i._isEmpty=!0,i.historyList.length=0},this.undo=function(){if(0===i.get("options").maxHistoryLength&&i.clear(),i.get("createImage")&&i.historyList.length){var t=i.historyList.splice(-1)[0];i.drawByImage(t),0===i.historyList.length&&i.clear()}},this.canvas=e,this.canvas.set("pen",T),this.init()}return r(t,[{key:"getOption",value:function(){}},{key:"setOption",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},i=e({},t),n=i.maxLineWidth;if(n&&t.penSize&&n==T.maxLineWidth){var o=Math.max(n,t.penSize);i.maxLineWidth=o}this.canvas.set("pen",Object.assign({},T,i))}},{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"),i=this.get("height"),n=this.get("options"),o=n.backgroundColor,r=n.backgroundImage;o&&(t.fillStyle=o,t.fillRect(0,0,e,i),t.draw&&t.draw(!0)),r&&this.drawByImage(r)}},{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 i=e[0];this.initPoint(i.x,i.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.canAddHistory=!0,this.points=[])}},{key:"onDraw",value:function(){var t=this,e=this.get("context");if(this.points.length>=2){this.addHistory(),e.lineWidth=this.get("options").penSize||2;var i=this.points.slice(-1)[0],n=this.points.slice(-2,-1)[0],o=function(){t._isEmpty=!1,t.get("options").openSmooth?t.drawSmoothLine(n,i):t.drawNoSmoothLine(n,i)};"function"==typeof this.get("el").requestAnimationFrame?this.get("el").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 i={x:t,y:e,t:Date.now()},n=this.points.slice(-1)[0];if(!n||n.t!==i.t&&(n.x!==t||n.y!==e)){if(this.get("options").openSmooth&&n){var o=this.points.slice(-2,-1)[0];if(i.distance=Math.sqrt(Math.pow(i.x-n.x,2)+Math.pow(i.y-n.y,2)),i.speed=i.distance/(i.t-n.t||.1),i.lineWidth=this.getLineWidth(i.speed),o&&o.lineWidth&&n.lineWidth){var r=(i.lineWidth-n.lineWidth)/n.lineWidth,s=this.get("options").maxWidthDiffRate/100;if(s=s>1?1:.01>s?.01:s,Math.abs(r)>s)i.lineWidth=n.lineWidth*(1+(r>0?s:-s))}}this.points.push(i),this.points=this.points.slice(-3)}}}]),t}(),S=function(){function t(e){n(this,t),this.canvas=void 0,this._ee=void 0,this.pen=void 0;var i=new P(e);i.set("parent",this),this.canvas=i,this._ee=new p,this.pen=new M(i),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:"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 S;export{S as Signature};
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