web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/forcesvg.component.html

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<svg:desc xmlns:svg="http://www.w3.org/2000/svg">The force layout layer. This is
    an SVG component that displays Nodes (Devices, Hosts and SubRegions) and
    Links. Positions of each are driven by a forces computation engine</svg:desc>
<svg:g xmlns:svg="http://www.w3.org/2000/svg" class="topo2-links">
    <svg:desc>Topology links</svg:desc>
    <!-- Template explanation: Creates an SVG Group and in
        line 1) use the svg component onos-linksvg, setting it's link
         Input parameter to the link item from the next line
        line 2) Use the built in NgFor directive to iterate through the
         set of links filtered by the filteredLinks() function.
    -->
    <svg:g onos-linksvg [link]="link"
           *ngFor="let link of filteredLinks()"
           [highlightsEnabled]="highlightPorts"
           (selectedEvent)="updateSelected($event)">
    </svg:g>
</svg:g>
<svg:g xmlns:svg="http://www.w3.org/2000/svg" class="topo2-nodes">
    <svg:desc>Topology nodes</svg:desc>
    <!-- Template explanation - create an SVG Group and
        line 1) use the svg component onos-devicenodesvg, setting it's device
         Input parameter to the device item from the next line
        line 2) Use the built in NgFor directive to iterate through all
         of the devices in the chosen layer index. The current iteration
         is in the device variable
        line 3) Use the onosDraggable directive and pass this device in to
         its draggableNode Input parameter and setting the draggableInGraph
         Input parameter to 'graph'
        line 4) when the onos-devicenodesvg component emits the selectedEvent
         call the updateSelected() method of this (forcesvg) component
    -->
    <svg:g onos-devicenodesvg [device]="device"
           *ngFor="let device of regionData.devices[visibleLayerIdx()]"
           onosDraggableNode [draggableNode]="device" [draggableInGraph]="graph"
           (selectedEvent)="updateSelected($event)">
        <svg:desc>Device nodes</svg:desc>
    </svg:g>
    <!-- Template explanation - only display the hosts if 'showHosts' is set true -->
    <svg:g *ngIf="showHosts">
        <!-- Template explanation - create an SVG Group and
            line 1) use the svg component onos-hostnodesvg, setting it's host
             Input parameter to the host item from the next line
            line 2) Use the built in NgFor directive to iterate through all
             of the hosts in the chosen layer index. The current iteration
             is in the 'host' variable
            line 3) Use the onosDraggable directive and pass this host in to
             its draggableNode Input parameter and setting the draggableInGraph
             Input parameter to 'graph'
            line 4) when the onos-hostnodesvg component emits the selectedEvent
             call the updateSelected() method of this (forcesvg) component
        -->
        <svg:g onos-hostnodesvg [host]="host"
               *ngFor="let host of regionData.hosts[visibleLayerIdx()]"
               onosDraggableNode [draggableNode]="host" [draggableInGraph]="graph"
               (selectedEvent)="updateSelected($event)">
            <svg:desc>Host nodes</svg:desc>
        </svg:g>
    </svg:g>
    <svg:g onos-subregionnodesvg [subRegion]="subRegion"
           *ngFor="let subRegion of regionData.subregions"
           onosDraggableNode [draggableNode]="host" [draggableInGraph]="graph">
        <svg:desc>Subregion nodes</svg:desc>
    </svg:g>
</svg:g>