much new

static/index.html

@@ -4,6 +4,8 @@
 
 <html>
   <head>
+    <title>UTA Vehicle Tracker</title>
+
     <link
       rel="stylesheet"
       href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css"
@@ -17,6 +19,10 @@
     <link href="https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300..800;1,300..800&display=swap" rel="stylesheet">
 
     <style>
+      .leaflet-marker-icon:has(.vehicle) {
+        transition: transform 300ms linear;
+      }
+
       html,
       body {
         margin: 0;

static/js/main.js

@@ -1,9 +1,11 @@
-import * as shapes from "./shapes.js";
 import protobuf from "https://cdn.jsdelivr.net/npm/protobufjs@8.0.0/dist/protobuf.js/+esm";
 import * as L from "https://cdn.jsdelivr.net/npm/leaflet@1.9.4/dist/leaflet-src.esm.js";
-import stations from "./stations.js"
 import Alpine from "https://cdn.jsdelivr.net/npm/alpinejs@3.x.x/dist/module.esm.min.js";
 
+import * as shapes from "./shapes.js";
+import stations from "./stations.js"
+
+/** @type {number} */
 let lastUpdated;
 
 function displayLastUpdated() {
@@ -122,41 +124,10 @@ protobuf.load("/schema.proto").then((root) => {
 
   let bannerVisible = false
 
-  async function reload() {
-    const bin = await fetch("/api").then((r) => r.arrayBuffer());
-    const { vehicles, info } = root
-      .lookupType("VehicleFeed")
-      .decode(new Uint8Array(bin));
+  let currentVehicles = new Map()
 
-    lastUpdated = info.lastUpdate
-    displayLastUpdated()
-
-    populateTotals(vehicles)
-    if (vehicles.length == 0) {
-      if (!bannerVisible) {
-        document.getElementById("banner").classList.remove("hidden")
-        bannerVisible = true
-        map.invalidateSize()
-      }
-    } else {
-      if (bannerVisible) {
-        document.getElementById("banner").classList.add("hidden")
-        bannerVisible = false
-        map.invalidateSize()
-      }
-    }
-
-    // render vehicles on map
-    clearMap();
-
-    vehicles.forEach((vehicle) => {
-      L.marker([vehicle.lat, vehicle.lon], {
-        zIndexOffset:
-          vehicle.route.type == RouteType.TRAM ||
-          vehicle.route.type == RouteType.RAIL
-            ? 4000
-            : 3000,
-        icon: L.divIcon({
+  function renderVehicleIcon(vehicle) {
+    return L.divIcon({
       className: "",
       html: `<div class="vehicle ${
         vehicle.route.type == RouteType.BUS &&
@@ -181,9 +152,61 @@ protobuf.load("/schema.proto").then((root) => {
                     : ""
                 }
               </div>`,
-        }),
     })
-        .addTo(
+  }
+
+  function renderVehicle(vehicle) {
+    return L.marker([vehicle.lat, vehicle.lon], {
+            zIndexOffset:
+              vehicle.route.type == RouteType.TRAM ||
+              vehicle.route.type == RouteType.RAIL
+                ? 4000
+                : 3000,
+            icon: renderVehicleIcon(vehicle),
+          })
+            .bindPopup(
+              `<b>${routeDesignator(vehicle.route)}</b> to <b>${vehicle.headsign.replace(
+                /^to /i,
+                ""
+              )}</b>${vehicle.nearestStation ? `<br />@ ${vehicle.nearestStation?.name}` : ""}<br /><br /><small>vehicle #: ${vehicle.id}</small>`
+            );
+  }
+
+  async function reload() {
+    const bin = await fetch("/api").then((r) => r.arrayBuffer());
+    const { vehicles, info } = root
+      .lookupType("VehicleFeed")
+      .decode(new Uint8Array(bin));
+
+    lastUpdated = info.lastUpdate
+    displayLastUpdated()
+
+    populateTotals(vehicles)
+    if (vehicles.length == 0) {
+      if (!bannerVisible) {
+        document.getElementById("banner").classList.remove("hidden")
+        bannerVisible = true
+        map.invalidateSize()
+      }
+    } else {
+      if (bannerVisible) {
+        document.getElementById("banner").classList.add("hidden")
+        bannerVisible = false
+        map.invalidateSize()
+      }
+    }
+
+    const seenVehicleIds = new Set()
+
+    vehicles.forEach((vehicle) => {
+      seenVehicleIds.add(vehicle.id)
+
+      if (currentVehicles.has(vehicle.id)) { // if this vehicle is already on the map, update its location
+        currentVehicles.get(vehicle.id).marker.setLatLng([vehicle.lat, vehicle.lon])
+        currentVehicles.get(vehicle.id).marker.setIcon(renderVehicleIcon(vehicle))
+      } else {
+        const marker = renderVehicle(vehicle)
+        marker.addTo(
           ["92235", "3686", "87711"].includes(vehicle.route.id)
             ? brtLayer
             : vehicle.route.type == RouteType.TRAM
@@ -191,14 +214,22 @@ protobuf.load("/schema.proto").then((root) => {
               : vehicle.route.type == RouteType.RAIL
                 ? frontRunnerLayer
                 : busLayer
-        )
-        .bindPopup(
-          `<b>${routeDesignator(vehicle.route)}</b> to <b>${vehicle.headsign.replace(
-            /^to /i,
-            ""
-          )}</b>${vehicle.nearestStation ? `<br />@ ${vehicle.nearestStation?.name}` : ""}<br /><br /><small>vehicle #: ${vehicle.id}</small>`
         );
+        currentVehicles.set(vehicle.id, {
+          vehicle,
+          marker,
+        })
+      }
     });
+
+    // remove any vehicles that should be removed
+    for (const key of currentVehicles.keys()) {
+      if (!seenVehicleIds.has(key)) {
+        console.log(`removing vehicle from route ${currentVehicles.get(key).vehicle.route.shortName}`)
+        currentVehicles.get(key).marker.remove()
+        currentVehicles.delete(key)
+      }
+    }
   }
 
   reload();