Implement clicking on course & follow mode

src/front/index.js

@@ -1,13 +1,9 @@
 import network from "../data/network.json";
 import * as simulation from "../data/simulation.js";
-import * as map from "./map/index.js";
+import Map from "./map/index.js";
 
 // Run courses simulation
-const coursesSimulation = simulation.start();
+const simstate = simulation.start();
-let selectedCourse = null;
-
-window.__courses = coursesSimulation.courses;
-window.__network = network;
 
 // Create display panel
 const panel = document.querySelector("#panel");
@@ -29,9 +25,9 @@ const timeToHTML = time => {
     }
 };
 
-setInterval(() => {
+const updatePanel = () => {
-    const vehicleCount = Object.values(coursesSimulation.courses).length;
+    const vehicleCount = Object.values(simstate.courses).length;
-    const movingVehicles = Object.values(coursesSimulation.courses).filter(
+    const movingVehicles = Object.values(simstate.courses).filter(
         course => course.properties.speed > 0
     ).length;
 
@@ -49,8 +45,8 @@ setInterval(() => {
         </dl>
     `;
 
-    if (selectedCourse !== null && selectedCourse in coursesSimulation.courses) {
+    if (map.selectedCourse !== null && map.selectedCourse in simstate.courses) {
-        const course = coursesSimulation.courses[selectedCourse];
+        const course = simstate.courses[map.selectedCourse].properties;
 
         const stopToHTML = stopId => stopId in network.stops ?
             network.stops[stopId].properties.name :
@@ -75,9 +71,10 @@ setInterval(() => {
         }
 
         html += `
+            <h2>Véhicule</h2>
             <dl>
                 <dt>ID</dt>
-                <dd>${selectedCourse}</dd>
+                <dd>${map.selectedCourse}</dd>
 
                 <dt>Ligne</dt>
                 <dd>${course.line}</dd>
@@ -115,17 +112,30 @@ setInterval(() => {
     }
 
     panel.innerHTML = html;
-}, 1000);
+};
 
-// Create the network and courses map
+setInterval(updatePanel, 1000);
-window.__map = map.create(/* map = */ "map", coursesSimulation, courses => {
+
-    const index = courses.indexOf(selectedCourse);
+const map = new Map("map", simstate, {
+    onVehicleClick(courses) {
+        courses = [...courses];
+        courses.sort();
+
+        const index = courses.indexOf(map.selectedCourse);
 
         if (courses.length === 0) {
-        selectedCourse = null;
+            map.select(null);
         } else if (index === -1) {
-        selectedCourse = courses[0];
+            map.select(courses[0]);
         } else {
-        selectedCourse = courses[(index + 1) % courses.length];
+            map.select(courses[(index + 1) % courses.length]);
+        }
+
+        updatePanel();
     }
 });
+
+// Reference as globals to facilitate debugging
+window.__map = map;
+window.__simstate = simstate.courses;
+window.__network = network;

src/front/map/index.js

@@ -1,5 +1,5 @@
 import "maplibre-gl/dist/maplibre-gl.css";
-import { Map, NavigationControl } from "maplibre-gl";
+import * as maplibre from "maplibre-gl";
 
 import * as network from "./network";
 import * as vehicles from "./vehicles";
@@ -16,8 +16,15 @@ const bounds = [
     "4.092750549316406", "43.73736766145917",
 ];
 
-export const create = (target, simulation, onClick) => {
+export default class Map {
-    const map = new Map({
+    /**
+     * Instantiate a map.
+     * @param {string|HTMLElement} target The container to add the map to.
+     * @param {Object} simstate Course simulation state.
+     * @param {Object.<callable>} handlers Handlers for the map events.
+     */
+    constructor(target, simstate, handlers) {
+        this.renderer = new maplibre.Map({
             container: target,
             style,
             bounds,
@@ -26,23 +33,64 @@ export const create = (target, simulation, onClick) => {
             maxPitch: 70,
         });
 
-    map.addControl(new NavigationControl());
+        this.renderer.addControl(new maplibre.NavigationControl());
 
-    const animate = () => {
+        this.renderer.on("load", () => {
-        simulation.update();
+            network.addLayers(this.renderer);
-        vehicles.update(map, simulation.courses);
+            vehicles.addLayers(this.renderer, handlers);
-        requestAnimationFrame(animate);
-    };
-
-    map.on("load", () => {
-        network.addLayers(map);
-        vehicles.addLayers(map);
 
             // Move 3D buildings to the front of custom layers
-        map.moveLayer("building-3d");
+            this.renderer.moveLayer("building-3d");
-
+            this.start();
-        animate();
         });
 
-    return map;
+        // ID of the currently selected course
-};
+        this.selectedCourse = null;
+
+        this.animation = null;
+        this.simstate = simstate;
+        this.handlers = handlers;
+    }
+
+    /** Start animating vehicles on the map. */
+    start() {
+        this._animate();
+    }
+
+    /** Stop the vehicle animation. */
+    stop() {
+        cancelAnimationFrame(this.animation);
+        this.animation = null;
+    }
+
+    /**
+     * Select or unselect a vehicle.
+     * @param {string?} id The ID of the vehicle to select, or null to unselect.
+     */
+    select(courseId) {
+        this.selectedCourse = courseId;
+
+        const course = this.simstate.courses[courseId];
+        this.renderer.flyTo({
+            center: course.geometry.coordinates,
+            bearing: course.properties.bearing,
+            pitch: 60,
+            zoom: 20,
+        });
+    }
+
+    _animate() {
+        this.simstate.update();
+        vehicles.update(this.renderer, this.simstate.courses);
+
+        if (this.selectedCourse !== null && !this.renderer.isMoving()) {
+            const course = this.simstate.courses[this.selectedCourse];
+            this.renderer.jumpTo({
+                center: course.geometry.coordinates,
+                bearing: course.properties.bearing,
+            });
+        }
+
+        this.animation = requestAnimationFrame(this._animate.bind(this));
+    }
+}

src/front/map/vehicles.js

@@ -1,15 +1,8 @@
-// import { getVectorContext } from "ol/render";
-// import Point from "ol/geom/Point";
-// import { fromExtent } from 'ol/geom/Polygon';
-// import { Style, Icon } from "ol/style";
 import * as turfHelpers from "@turf/helpers";
 
 import { scaleZoom, makeBorderColor, makeCourseColor } from "./common";
 import network from "../../data/network.json";
 
-const VEHICLE_SIZE = 15;
-const VEHICLE_BORDER = 10;
-
 const makeVehicleIcon = size => {
     const canvas = window.document.createElement("canvas");
     const context = canvas.getContext("2d");
@@ -20,8 +13,8 @@ const makeVehicleIcon = size => {
     const cx = size / 2;
     const cy = size / 2;
 
-    const iconSize = 0.4 * size;
+    const iconSize = 0.7 * size;
-    const borderSize = 0.2 * size;
+    const borderSize = 0.3 * size;
 
     context.fillStyle = "black";
     context.strokeStyle = "black";
@@ -47,8 +40,9 @@ const makeVehicleIcon = size => {
 /**
  * Add layers that display the live vehicle positions on the map.
  * @param {Map} map The map to add the layers to.
+ * @param {Object.<callable>} handlers Handlers for the map events.
  */
-export const addLayers = map => {
+export const addLayers = (map, handlers) => {
     map.addImage("vehicle", makeVehicleIcon(128), {sdf: true});
 
     map.addSource("vehicles", {
@@ -77,6 +71,37 @@ export const addLayers = map => {
             },
         });
     }
+
+    map.on("click", "vehicles-outer", event => {
+        // Sort clicked courses in increasing order of departing/arrival time
+        event.features.sort((feature1, feature2) => {
+            const course1 = feature1.properties;
+            const course2 = feature2.properties;
+
+            const time1 = (
+                course1.speed > 0 ? course1.arrivalTime : course1.departureTime
+            );
+
+            const time2 = (
+                course2.speed > 0 ? course2.arrivalTime : course2.departureTime
+            );
+
+            return time1 - time2;
+        });
+
+        handlers.onVehicleClick(event.features.map(
+            feature => feature.properties.id
+        ));
+    });
+
+    // Show a pointer cursor when hovering over a vehicle
+    map.on("mouseenter", "vehicles-outer", () => {
+        map.getCanvas().style.cursor = "pointer";
+    });
+
+    map.on("mouseleave", "vehicles-outer", () => {
+        map.getCanvas().style.cursor = '';
+    });
 };
 
 /**
@@ -98,136 +123,3 @@ export const update = (map, courses) => {
         turfHelpers.featureCollection(Object.values(courses))
     );
 };
-
-// const courseStyle = cacheStyle(
-//     lineColor => {
-//         const icon = window.document.createElement("canvas");
-
-//         const shapeSize = sizes.courseSize;
-//         const iconSize = sizes.courseSize + sizes.courseOuterBorder;
-
-//         icon.width = iconSize;
-//         icon.height = iconSize;
-
-//         const cx = icon.width / 2;
-//         const cy = icon.height / 2;
-
-//         const iconCtx = icon.getContext("2d");
-
-//         for (const [color, size] of [
-//             [makeBorderColor(lineColor), sizes.courseOuterBorder],
-//             [lineColor, sizes.courseBorder],
-//             [makeCourseColor(lineColor), sizes.courseInnerBorder]
-//         ]) {
-//             iconCtx.fillStyle = color;
-//             iconCtx.strokeStyle = color;
-//             iconCtx.lineWidth = size;
-//             iconCtx.lineJoin = "round";
-//             iconCtx.miterLimit = 200000;
-
-//             iconCtx.beginPath();
-//             iconCtx.moveTo(cx - 0.5 * shapeSize, cy - 0.3 * shapeSize);
-//             iconCtx.lineTo(cx + 0.5 * shapeSize, cy);
-//             iconCtx.lineTo(cx - 0.5 * shapeSize, cy + 0.3 * shapeSize);
-//             iconCtx.closePath();
-//             iconCtx.stroke();
-//             iconCtx.fill();
-//         }
-
-//         return new Style({
-//             image: new Icon({
-//                 img: icon,
-//                 imgSize: [icon.width, icon.height]
-//             })
-//         });
-//     },
-// );
-
-// export const setupCoursesAnimation = (
-//     map, coursesSimulation, stopsLayer, onClick
-// ) => {
-//     const view = map.getView();
-
-//     // Draw courses directly on the map
-//     map.on("postcompose", ev => {
-//         coursesSimulation.update();
-
-//         // The normal way to access a layer’s vector context is through the
-//         // `postrender` event of that layer. However, `postrender` is not
-//         // triggered when no feature of the layer is inside the current
-//         // bounding box, but we want to draw vehicles in between stops even
-//         // if no stop is visible. This hack listens to the global `postcompose`
-//         // event, which is always triggered at every frame, and reconstructs
-//         // the stops layer’s vector context from internal variables
-//         /* eslint-disable no-underscore-dangle */
-//         if (stopsLayer.renderer_) {
-//             ev.context = stopsLayer.renderer_.context;
-//             ev.inversePixelTransform =
-//                 stopsLayer.renderer_.inversePixelTransform;
-//             /* eslint-enable no-underscore-dangle */
-
-//             const ctx = getVectorContext(ev);
-//             const bbox = fromExtent(map.getView().calculateExtent());
-//             bbox.scale(1.05);
-
-//             for (const course of Object.values(coursesSimulation.courses)) {
-//                 if (!bbox.intersectsCoordinate(course.position)) {
-//                     continue;
-//                 }
-
-//                 const point = new Point(course.position);
-//                 const color = network.lines[course.line].color;
-//                 const style = courseStyle(color);
-
-//                 style.getImage().setRotation(
-//                     view.getRotation() +
-//                     course.angle
-//                 );
-
-//                 ctx.setStyle(style);
-//                 ctx.drawGeometry(point);
-//             }
-//         }
-
-//         map.render();
-//     });
-
-//     map.on("singleclick", ev => {
-//         const mousePixel = map.getPixelFromCoordinate(ev.coordinate);
-//         const maxDistance = sizes.courseSize + sizes.courseInnerBorder;
-//         const clicked = [];
-
-//         for (const course of Object.values(coursesSimulation.courses)) {
-//             const coursePixel = map.getPixelFromCoordinate(course.position);
-//             const dx = mousePixel[0] - coursePixel[0];
-//             const dy = mousePixel[1] - coursePixel[1];
-//             const distance = dx * dx + dy * dy;
-
-//             if (distance <= maxDistance * maxDistance) {
-//                 clicked.push(course.id);
-//             }
-//         }
-
-//         // Sort selected courses in increasing departing/arrival time
-//         clicked.sort((id1, id2) => {
-//             const course1 = coursesSimulation.courses[id1];
-//             const course2 = coursesSimulation.courses[id2];
-
-//             const time1 = (
-//                 course1.state === "moving"
-//                 ? course1.arrivalTime
-//                 : course1.departureTime
-//             );
-
-//             const time2 = (
-//                 course2.state === "moving"
-//                 ? course2.arrivalTime
-//                 : course2.departureTime
-//             );
-
-//             return time1 - time2;
-//         });
-
-//         onClick(clicked);
-//     });
-// };