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this._cachedViewbox},Dn.prototype.getDefaultLayer=function(){return this.getLayer("base",0)},Dn.prototype.getLayer=function(e,t){if(!e)throw new Error("must specify a name");var n=(n=this._layers[e])||(this._layers[e]=this._createLayer(e,t));if(void 0!==t&&n.index!==t)throw new Error("layer <"+e+"> already created at index <"+t+">");return n.group},Dn.prototype._getChildIndex=function(n){return b(this._layers,function(e,t){return t.visible&&n>=t.index&&e++,e},0)},Dn.prototype._createLayer=function(e,t){var n=this._getChildIndex(t=void 0===t?1:t);return{group:Cn(this._viewport,"layer-"+e,n),index:t,visible:!0}},Dn.prototype.showLayer=function(e){if(!e)throw new Error("must specify a name");var t=this._layers[e];if(!t)throw new Error("layer <"+e+"> does not exist");var n=this._viewport,r=t.group,e=t.index;if(t.visible)return r;e=this._getChildIndex(e);return n.insertBefore(r,n.childNodes[e]||null),t.visible=!0,r},Dn.prototype.hideLayer=function(e){if(!e)throw new Error("must specify a 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r;e.id||(e=this._elementRegistry.get(e)),(r=this._elementRegistry._elements[e.id])&&(g([r.gfx,r.secondaryGfx],function(e){e&&(n?en(e).add(t):en(e).remove(t))}),this._eventBus.fire("element.marker.update",{element:e,gfx:r.gfx,marker:t,add:!!n}))},Dn.prototype.addMarker=function(e,t){this._updateMarker(e,t,!0)},Dn.prototype.removeMarker=function(e,t){this._updateMarker(e,t,!1)},Dn.prototype.hasMarker=function(e,t){return e.id||(e=this._elementRegistry.get(e)),en(this.getGraphics(e)).has(t)},Dn.prototype.toggleMarker=function(e,t){this.hasMarker(e,t)?this.removeMarker(e,t):this.addMarker(e,t)},Dn.prototype.getRootElement=function(){var e=this._rootElement;return e||this._planes.length?e:this.setRootElement(this.addRootElement(null))},Dn.prototype.addRootElement=function(e){var t=this._rootsIdx++,n=(e=e||{id:"__implicitroot_"+t,children:[],isImplicit:!0}).layer="root-"+t;this._ensureValid("root",e);t=this.getLayer(n,0);return this.hideLayer(n),this._addRoot(e,t),this._planes.push({rootElement:e,layer:t}),e},Dn.prototype.removeRootElement=function(t){if("string"==typeof t&&(t=this._elementRegistry.get(t)),this._findPlaneForRoot(t))return this._removeRoot(t),this._removeLayer(t.layer),this._planes=this._planes.filter(function(e){return e.rootElement!==t}),this._rootElement===t&&(this._rootElement=null),t},Dn.prototype.setRootElement=function(e,t){if(u(t))throw new Error("override not supported");if(e!==this._rootElement){if(!e)throw new Error("rootElement required");return this._findPlaneForRoot(e)||(e=this.addRootElement(e)),this._setRoot(e),e}},Dn.prototype._removeRoot=function(e){var t=this._elementRegistry,n=this._eventBus;n.fire("root.remove",{element:e}),n.fire("root.removed",{element:e}),t.remove(e)},Dn.prototype._addRoot=function(e,t){var n=this._elementRegistry,r=this._eventBus;r.fire("root.add",{element:e}),n.add(e,t),r.fire("root.added",{element:e,gfx:t})},Dn.prototype._setRoot=function(e,t){var n=this._rootElement;n&&(this._elementRegistry.updateGraphics(n,null,!0),this.hideLayer(n.layer)),e&&(t=t||this._findPlaneForRoot(e).layer,this._elementRegistry.updateGraphics(e,this._svg,!0),this.showLayer(e.layer)),this._rootElement=e,this._eventBus.fire("root.set",{element:e})},Dn.prototype._ensureValid=function(e,t){if(!t.id)throw new Error("element must have an id");if(this._elementRegistry.get(t.id))throw new Error("element <"+t.id+"> already exists");var n=Rn[e];if(!_(n,function(e){return void 0!==t[e]}))throw new Error("must supply { "+n.join(", ")+" } with "+e)},Dn.prototype._setParent=function(e,t,n){!function(e,t,n){if(e&&t){"number"!=typeof n&&(n=-1);var r=e.indexOf(t);if(-1!==r){if(r===n)return;if(-1===n)return;e.splice(r,1)}-1!==n?e.splice(n,0,t):e.push(t)}}(t.children,e,n),e.parent=t},Dn.prototype._addElement=function(e,t,n,r){n=n||this.getRootElement();var o=this._eventBus,i=this._graphicsFactory;this._ensureValid(e,t),o.fire(e+".add",{element:t,parent:n}),this._setParent(t,n,r);r=i.create(e,t,r);return this._elementRegistry.add(t,r),i.update(e,t,r),o.fire(e+".added",{element:t,gfx:r}),t},Dn.prototype.addShape=function(e,t,n){return this._addElement("shape",e,t,n)},Dn.prototype.addConnection=function(e,t,n){return this._addElement("connection",e,t,n)},Dn.prototype._removeElement=function(e,t){var n,r=this._elementRegistry,o=this._graphicsFactory,i=this._eventBus;if(e=r.get(e.id||e))return i.fire(t+".remove",{element:e}),o.remove(e),n=e.parent&&e.parent.children,o=e,!n||!o||-1!==(o=n.indexOf(o))&&n.splice(o,1),e.parent=null,i.fire(t+".removed",{element:e}),r.remove(e),e},Dn.prototype.removeShape=function(e){return this._removeElement(e,"shape")},Dn.prototype.removeConnection=function(e){return this._removeElement(e,"connection")},Dn.prototype.getGraphics=function(e,t){return this._elementRegistry.getGraphics(e,t)},Dn.prototype._changeViewbox=function(e){this._eventBus.fire("canvas.viewbox.changing"),e.apply(this),this._cachedViewbox=null,this._viewboxChanged()},Dn.prototype._viewboxChanged=function(){this._eventBus.fire("canvas.viewbox.changed",{viewbox:this.viewbox()})},Dn.prototype.viewbox=function(t){if(void 0===t&&this._cachedViewbox)return this._cachedViewbox;var e,n,r,o,i=this._viewport,a=this.getSize();return t?(this._changeViewbox(function(){n=Math.min(a.width/t.width,a.height/t.height);var e=this._svg.createSVGMatrix().scale(n).translate(-t.x,-t.y);gn(i,e)}),t):(e=(o=this._rootElement?this.getActiveLayer():null)&&o.getBBox()||{},o=(r=gn(i))?r.matrix:function(e,t,n,r,o,i){var a=un.createSVGMatrix();switch(arguments.length){case 0:return a;case 1:return ln(a,e);case 6:return ln(a,{a:e,b:t,c:n,d:r,e:o,f:i})}}(),n=Pn(o.a,1e3),r=Pn(-o.e||0,1e3),o=Pn(-o.f||0,1e3),t=this._cachedViewbox={x:r?r/n:0,y:o?o/n:0,width:a.width/n,height:a.height/n,scale:n,inner:{width:e.width||0,height:e.height||0,x:e.x||0,y:e.y||0},outer:a})},Dn.prototype.scroll=function(e){var t=this._viewport,n=t.getCTM();return e&&this._changeViewbox(function(){e=P({dx:0,dy:0},e||{}),n=this._svg.createSVGMatrix().translate(e.dx,e.dy).multiply(n),Nn(t,n)}),{x:n.e,y:n.f}},Dn.prototype.scrollToElement=function(e,t){var n=100;"string"==typeof e&&(e=this._elementRegistry.get(e));var r=this.findRoot(e);r!==this.getRootElement()&&this.setRootElement(r),"number"==typeof(t=t||{})&&(n=t),t={top:t.top||n,right:t.right||n,bottom:t.bottom||n,left:t.left||n};var o=xn(e),i=kn(o),a=this.viewbox(),r=this.zoom();a.y+=t.top/r,a.x+=t.left/r,a.width-=(t.right+t.left)/r,a.height-=(t.bottom+t.top)/r;var s,n=kn(a);a=o.width<a.width&&o.height<a.height?(e=Math.max(0,i.right-n.right),s=Math.min(0,i.left-n.left),t=Math.max(0,i.bottom-n.bottom),n=Math.min(0,i.top-n.top),s=e||s,t||n):(s=o.x-a.x,o.y-a.y),this.scroll({dx:-s*r,dy:-a*r})},Dn.prototype.zoom=function(e,t){return e?"fit-viewport"===e?this._fitViewport(t):(this._changeViewbox(function(){"object"!==y(t)&&(n=this.viewbox().outer,t={x:n.width/2,y:n.height/2}),r=this._setZoom(e,t)}),Pn(r.a,1e3)):this.viewbox(e).scale;var n,r},Dn.prototype._fitViewport=function(e){var t=this.viewbox(),n=t.outer,t=t.inner,r=0<=t.x&&0<=t.y&&t.x+t.width<=n.width&&t.y+t.height<=n.height&&!e?{x:0,y:0,width:Math.max(t.width+t.x,n.width),height:Math.max(t.height+t.y,n.height)}:(r=Math.min(1,n.width/t.width,n.height/t.height),{x:t.x+(e?t.width/2-n.width/r/2:0),y:t.y+(e?t.height/2-n.height/r/2:0),width:n.width/r,height:n.height/r});return this.viewbox(r),this.viewbox(!1).scale},Dn.prototype._setZoom=function(e,t){var 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t=this._elements,n=e.id||e,e=n&&t[n];e&&(Xt(e.gfx,Mn,""),e.secondaryGfx&&Xt(e.secondaryGfx,Mn,""),delete t[n])},Tn.prototype.updateId=function(e,t){this._validateId(t),"string"==typeof e&&(e=this.get(e)),this._eventBus.fire("element.updateId",{element:e,newId:t});var n=this.getGraphics(e),r=this.getGraphics(e,!0);this.remove(e),e.id=t,this.add(e,n,r)},Tn.prototype.updateGraphics=function(e,t,n){var r=e.id||e,e=this._elements[r];return n?e.secondaryGfx=t:e.gfx=t,t&&Xt(t,Mn,r),t},Tn.prototype.get=function(e){e="string"==typeof e?e:e&&Xt(e,Mn),e=this._elements[e];return e&&e.element},Tn.prototype.filter=function(n){var r=[];return this.forEach(function(e,t){n(e,t)&&r.push(e)}),r},Tn.prototype.find=function(e){for(var t=this._elements,n=Object.keys(t),r=0;r<n.length;r++){var o=t[n[r]],i=o.element;if(e(i,o.gfx))return i}},Tn.prototype.getAll=function(){return this.filter(function(e){return e})},Tn.prototype.forEach=function(n){var r=this._elements;Object.keys(r).forEach(function(e){var 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