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this._viewport},Tn.prototype._clear=function(){var e=this;this._elementRegistry.getAll().forEach((function(t){var n=Dt(t);"root"===n?e.removeRootElement(t):e._removeElement(t,n)})),this._planes=[],this._rootElement=null,delete this._cachedViewbox},Tn.prototype.getDefaultLayer=function(){return this.getLayer("base",0)},Tn.prototype.getLayer=function(e,t){if(!e)throw new Error("must specify a name");var n=this._layers[e];if(n||(n=this._layers[e]=this._createLayer(e,t)),void 0!==t&&n.index!==t)throw new Error("layer <"+e+"> already created at index <"+t+">");return n.group},Tn.prototype._getChildIndex=function(e){return m(this._layers,(function(t,n){return n.visible&&e>=n.index&&t++,t}),0)},Tn.prototype._createLayer=function(e,t){void 0===t&&(t=1);var n=this._getChildIndex(t);return{group:kn(this._viewport,"layer-"+e,n),index:t,visible:!0}},Tn.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,i=t.group,r=t.index;if(t.visible)return i;var o=this._getChildIndex(r);return n.insertBefore(i,n.childNodes[o]||null),t.visible=!0,i},Tn.prototype.hideLayer=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=t.group;return t.visible?(V(n),t.visible=!1,n):n},Tn.prototype._removeLayer=function(e){var t=this._layers[e];t&&(delete this._layers[e],V(t.group))},Tn.prototype.getActiveLayer=function(){var e=this._findPlaneForRoot(this.getRootElement());return e?e.layer:null},Tn.prototype.findRoot=function(e){if("string"==typeof e&&(e=this._elementRegistry.get(e)),e){var t=this._findPlaneForRoot(function(e){for(;e.parent;)e=e.parent;return e}(e))||{};return t.rootElement}},Tn.prototype.getRootElements=function(){return this._planes.map((function(e){return e.rootElement}))},Tn.prototype._findPlaneForRoot=function(e){return c(this._planes,(function(t){return t.rootElement===e}))},Tn.prototype.getContainer=function(){return this._container},Tn.prototype._updateMarker=function(e,t,n){var i;e.id||(e=this._elementRegistry.get(e)),(i=this._elementRegistry._elements[e.id])&&(h([i.gfx,i.secondaryGfx],(function(e){e&&(n?j(e).add(t):j(e).remove(t))})),this._eventBus.fire("element.marker.update",{element:e,gfx:i.gfx,marker:t,add:!!n}))},Tn.prototype.addMarker=function(e,t){this._updateMarker(e,t,!0)},Tn.prototype.removeMarker=function(e,t){this._updateMarker(e,t,!1)},Tn.prototype.hasMarker=function(e,t){return e.id||(e=this._elementRegistry.get(e)),j(this.getGraphics(e)).has(t)},Tn.prototype.toggleMarker=function(e,t){this.hasMarker(e,t)?this.removeMarker(e,t):this.addMarker(e,t)},Tn.prototype.getRootElement=function(){var e=this._rootElement;return e||this._planes.length?e:this.setRootElement(this.addRootElement(null))},Tn.prototype.addRootElement=function(e){var t=this._rootsIdx++;e||(e={id:"__implicitroot_"+t,children:[],isImplicit:!0});var n=e.layer="root-"+t;this._ensureValid("root",e);var i=this.getLayer(n,0);return this.hideLayer(n),this._addRoot(e,i),this._planes.push({rootElement:e,layer:i}),e},Tn.prototype.removeRootElement=function(e){if("string"==typeof e&&(e=this._elementRegistry.get(e)),this._findPlaneForRoot(e))return this._removeRoot(e),this._removeLayer(e.layer),this._planes=this._planes.filter((function(t){return t.rootElement!==e})),this._rootElement===e&&(this._rootElement=null),e},Tn.prototype.setRootElement=function(e,t){if(i(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}},Tn.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)},Tn.prototype._addRoot=function(e,t){var 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n=e.indexOf(t);-1!==n&&e.splice(n,1)}(e.parent&&e.parent.children,e),e.parent=null,r.fire(t+".removed",{element:e}),n.remove(e),e},Tn.prototype.removeShape=function(e){return this._removeElement(e,"shape")},Tn.prototype.removeConnection=function(e){return this._removeElement(e,"connection")},Tn.prototype.getGraphics=function(e,t){return this._elementRegistry.getGraphics(e,t)},Tn.prototype._changeViewbox=function(e){this._eventBus.fire("canvas.viewbox.changing"),e.apply(this),this._cachedViewbox=null,this._viewboxChanged()},Tn.prototype._viewboxChanged=function(){this._eventBus.fire("canvas.viewbox.changed",{viewbox:this.viewbox()})},Tn.prototype.viewbox=function(e){if(void 0===e&&this._cachedViewbox)return this._cachedViewbox;var t,n,i,r,o,a,s,l=this._viewport,p=this.getSize();return e?(this._changeViewbox((function(){o=Math.min(p.width/e.width,p.height/e.height);var t=this._svg.createSVGMatrix().scale(o).translate(-e.x,-e.y);re(l,t)})),e):(t=(i=this._rootElement?this.getActiveLayer():null)&&i.getBBox()||{},n=(r=re(l))?r.matrix:function(e,t,n,i,r,o){var a=U().createSVGMatrix();switch(arguments.length){case 0:return a;case 1:return q(a,e);case 6:return q(a,{a:e,b:t,c:n,d:i,e:r,f:o})}}(),o=Cn(n.a,1e3),a=Cn(-n.e||0,1e3),s=Cn(-n.f||0,1e3),e=this._cachedViewbox={x:a?a/o:0,y:s?s/o:0,width:p.width/o,height:p.height/o,scale:o,inner:{width:t.width||0,height:t.height||0,x:t.x||0,y:t.y||0},outer:p})},Tn.prototype.scroll=function(e){var t=this._viewport,n=t.getCTM();return e&&this._changeViewbox((function(){e=E({dx:0,dy:0},e||{}),n=this._svg.createSVGMatrix().translate(e.dx,e.dy).multiply(n),Dn(t,n)})),{x:n.e,y:n.f}},Tn.prototype.scrollToElement=function(e,t){var n=100;"string"==typeof e&&(e=this._elementRegistry.get(e));var i=this.findRoot(e);i!==this.getRootElement()&&this.setRootElement(i),t||(t={}),"number"==typeof t&&(n=t),t={top:t.top||n,right:t.right||n,bottom:t.bottom||n,left:t.left||n};var r,o,a=Tt(e),s=mt(a),l=this.viewbox(),p=this.zoom();l.y+=t.top/p,l.x+=t.left/p,l.width-=(t.right+t.left)/p,l.height-=(t.bottom+t.top)/p;var c=mt(l);if(a.width<l.width&&a.height<l.height){var u=Math.max(0,s.right-c.right),h=Math.min(0,s.left-c.left),m=Math.max(0,s.bottom-c.bottom),f=Math.min(0,s.top-c.top);r=u||h,o=m||f}else r=a.x-l.x,o=a.y-l.y;this.scroll({dx:-r*p,dy:-o*p})},Tn.prototype.zoom=function(e,t){return e?"fit-viewport"===e?this._fitViewport(t):(this._changeViewbox((function(){"object"!=typeof t&&(n=this.viewbox().outer,t={x:n.width/2,y:n.height/2}),i=this._setZoom(e,t)})),Cn(i.a,1e3)):this.viewbox(e).scale;var n,i},Tn.prototype._fitViewport=function(e){var t,n,i=this.viewbox(),r=i.outer,o=i.inner;return 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   *
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   *
   * @see http://bpmn.io/license
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