support marker clusters

src/public/index.html

@@ -20,6 +20,9 @@
     <!-- leaflet map -->
     <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.3/dist/leaflet.css" integrity="sha256-kLaT2GOSpHechhsozzB+flnD+zUyjE2LlfWPgU04xyI=" crossorigin="" />
     <script src="https://unpkg.com/leaflet@1.9.3/dist/leaflet.js" integrity="sha256-WBkoXOwTeyKclOHuWtc+i2uENFpDZ9YPdf5Hf+D7ewM=" crossorigin=""></script>
+    <script src="plugins/leaflet.markercluster/leaflet.markercluster.js"></script>
+    <link rel="stylesheet" href="plugins/leaflet.markercluster/MarkerCluster.css"/>
+    <link rel="stylesheet" href="plugins/leaflet.markercluster/MarkerCluster.Default.css"/>
 
     <!-- moment -->
     <script src="https://cdn.jsdelivr.net/npm/moment@2.29.1/moment.min.js"></script>
@@ -882,6 +885,9 @@
     // create layer groups
     var nodesLayerGroup = new L.LayerGroup();
     var neighboursLayerGroup = new L.LayerGroup();
+    var nodesClusteredLayerGroup = L.markerClusterGroup({
+        showCoverageOnHover: false,
+    });
 
     // create icons
     var iconOnline = L.divIcon({ className: 'icon-online'});
@@ -898,11 +904,11 @@
     };
 
     var baseLayers = {
-
+        "Nodes (All)": nodesLayerGroup,
+        "Nodes (Clustered)": nodesClusteredLayerGroup,
     };
 
     var overlays = {
-        "Nodes": nodesLayerGroup,
         "Neighbours": neighboursLayerGroup,
     };
 
@@ -910,7 +916,8 @@
     L.control.layers(baseLayers, overlays).addTo(map);
 
     // add layers to map that should be enabled by default
-    nodesLayerGroup.addTo(map);
+    // nodesLayerGroup.addTo(map);
+    nodesClusteredLayerGroup.addTo(map);
     // neighboursLayerGroup.addTo(map);
     // legend.addTo(map);
 
@@ -1176,8 +1183,11 @@
                     .on('click', function(event) {
                         // close tooltip on click to prevent tooltip and popup showing at same time
                         event.target.closeTooltip();
-                    })
-                    .addTo(nodesLayerGroup);
+                    });
+
+                // add marker to node layer groups
+                marker.addTo(nodesLayerGroup);
+                nodesClusteredLayerGroup.addLayer(marker);
 
                 // show node info sidebar when clicking node marker
                 marker.on("click", function(event) {

src/public/plugins/leaflet.markercluster/MarkerCluster.Default.css

@@ -0,0 +1,60 @@
+.marker-cluster-small {
+	background-color: rgba(181, 226, 140, 0.6);
+	}
+.marker-cluster-small div {
+	background-color: rgba(110, 204, 57, 0.6);
+	}
+
+.marker-cluster-medium {
+	background-color: rgba(241, 211, 87, 0.6);
+	}
+.marker-cluster-medium div {
+	background-color: rgba(240, 194, 12, 0.6);
+	}
+
+.marker-cluster-large {
+	background-color: rgba(253, 156, 115, 0.6);
+	}
+.marker-cluster-large div {
+	background-color: rgba(241, 128, 23, 0.6);
+	}
+
+	/* IE 6-8 fallback colors */
+.leaflet-oldie .marker-cluster-small {
+	background-color: rgb(181, 226, 140);
+	}
+.leaflet-oldie .marker-cluster-small div {
+	background-color: rgb(110, 204, 57);
+	}
+
+.leaflet-oldie .marker-cluster-medium {
+	background-color: rgb(241, 211, 87);
+	}
+.leaflet-oldie .marker-cluster-medium div {
+	background-color: rgb(240, 194, 12);
+	}
+
+.leaflet-oldie .marker-cluster-large {
+	background-color: rgb(253, 156, 115);
+	}
+.leaflet-oldie .marker-cluster-large div {
+	background-color: rgb(241, 128, 23);
+}
+
+.marker-cluster {
+	background-clip: padding-box;
+	border-radius: 20px;
+	}
+.marker-cluster div {
+	width: 30px;
+	height: 30px;
+	margin-left: 5px;
+	margin-top: 5px;
+
+	text-align: center;
+	border-radius: 15px;
+	font: 12px "Helvetica Neue", Arial, Helvetica, sans-serif;
+	}
+.marker-cluster span {
+	line-height: 30px;
+	}

src/public/plugins/leaflet.markercluster/MarkerCluster.css

@@ -0,0 +1,14 @@
+.leaflet-cluster-anim .leaflet-marker-icon, .leaflet-cluster-anim .leaflet-marker-shadow {
+	-webkit-transition: -webkit-transform 0.3s ease-out, opacity 0.3s ease-in;
+	-moz-transition: -moz-transform 0.3s ease-out, opacity 0.3s ease-in;
+	-o-transition: -o-transform 0.3s ease-out, opacity 0.3s ease-in;
+	transition: transform 0.3s ease-out, opacity 0.3s ease-in;
+}
+
+.leaflet-cluster-spider-leg {
+	/* stroke-dashoffset (duration and function) should match with leaflet-marker-icon transform in order to track it exactly */
+	-webkit-transition: -webkit-stroke-dashoffset 0.3s ease-out, -webkit-stroke-opacity 0.3s ease-in;
+	-moz-transition: -moz-stroke-dashoffset 0.3s ease-out, -moz-stroke-opacity 0.3s ease-in;
+	-o-transition: -o-stroke-dashoffset 0.3s ease-out, -o-stroke-opacity 0.3s ease-in;
+	transition: stroke-dashoffset 0.3s ease-out, stroke-opacity 0.3s ease-in;
+}