Mapbox javascript : 在移动的标记处打个断（模拟红绿灯）

Question

如何像在红色交通灯处一样在我的标记处休息，然后再次开始，（短暂停留）我在网上找不到任何 tuto ..（在随机点停止坐标），它用于模拟。我只是想知道我们是怎么做到的。我试过 setTimeOut，但它不起作用。谢谢你的帮助！

var marker1 = new mapboxgl.Marker({
        className: 'marker1'
    }) // Initialize a new marker 
    .setLngLat([6.167361, 45.362544]) // Marker [lng, lat] coordinates
    .addTo(map);

var coords = [
    [6.157903, 45.361839],
    [6.157956, 45.361699],
    [6.161326, 45.363424],
    [6.165399, 45.361447],
    [6.16741, 45.36239],
    [6.167361, 45.362544]

];

var origin = [6.157903, 45.361839];
var waypoint1 = [6.157956, 45.361699];
var waypoint2 = [6.161326, 45.363424];
var waypoint3 = [6.165399, 45.361447];
var waypoint4 = [6.16741, 45.36239];

var destination = [6.167361, 45.362544];
var size = 250;

// implementation of CustomLayerInterface to draw a pulsing dot icon on the map
// see https://docs.mapbox.com/mapbox-gl-js/api/#customlayerinterface for more info
var pulsingDot = {
    width: size,
    height: size,
    data: new Uint8Array(size * size * 4),

    // get rendering context for the map canvas when layer is added to the map
    onAdd: function () {
        var canvas = document.createElement('canvas');
        canvas.width = this.width;
        canvas.height = this.height;
        this.context = canvas.getContext('2d');
    },

    // called once before every frame where the icon will be used
    render: function () {
        var duration = 1000;
        var t = (performance.now() % duration) / duration;

        var radius = (size / 2) * 0.3;
        var outerRadius = (size / 2) * 0.7 * t + radius;
        var context = this.context;

        // draw outer circle
        context.clearRect(0, 0, this.width, this.height);
        context.beginPath();
        context.arc(
            this.width / 2,
            this.height / 2,
            outerRadius,
            0,
            Math.PI * 2
        );
        context.fillStyle = 'rgba(255, 200, 200,' + (1 - t) + ')';
        context.fill();

        // draw inner circle
        context.beginPath();
        context.arc(
            this.width / 2,
            this.height / 2,
            radius,
            0,
            Math.PI * 2
        );
        context.fillStyle = 'rgba(255, 100, 100, 1)';
        context.strokeStyle = 'white';
        context.lineWidth = 2 + 4 * (1 - t);
        context.fill();
        context.stroke();

        // update this image's data with data from the canvas
        this.data = context.getImageData(
            0,
            0,
            this.width,
            this.height
        ).data;

        // continuously repaint the map, resulting in the smooth animation of the dot
        map.triggerRepaint();

        // return `true` to let the map know that the image was updated
        return true;
    }
};
// A simple line from origin to destination.
var route = {
    'type': 'FeatureCollection',
    'features': [{
        'type': 'Feature',
        'geometry': {
            'type': 'LineString',
            'coordinates': [origin, waypoint1, waypoint2, waypoint3, waypoint4, destination] // here you can add the additional waypoints
        }
    }]
};

// A single point that animates along the route.
// Coordinates are initially set to origin.
var point = {
    'type': 'FeatureCollection',
    'features': [{
        'type': 'Feature',
        'properties': {},
        'geometry': {
            'type': 'Point',
            'coordinates': origin
        }
    }]
};

// Calculate the distance in kilometers between route start/end point.
var lineDistance = turf.length(route.features[0]);

var arc = [];

// Number of steps to use in the arc and animation, more steps means
// a smoother arc and animation, but too many steps will result in a
// low frame rate
var steps = 2500;

// Draw an arc between the `origin` & `destination` of the two points
for (var i = 0; i < lineDistance; i += lineDistance / steps) {
    var segment = turf.along(route.features[0], i);
    arc.push(segment.geometry.coordinates);
}

// Update the route with calculated arc coordinates
route.features[0].geometry.coordinates = arc;

// Used to increment the value of the point measurement against the route.
var counter = 0;

map.on('load', function () {
    map.addImage('pulsing-dot', pulsingDot, {
        pixelRatio: 6
    });
    // Add a source and layer displaying a point which will be animated in a circle.
    map.addSource('route', {
        'type': 'geojson',
        'data': route
    });

    map.addSource('point', {
        'type': 'geojson',
        'data': point
    });

    map.addLayer({
        'id': 'route',
        'source': 'route',
        'type': 'line',
        'paint': {
            'line-width': 2,
            'line-color': '#ff8e0a',
            'line-dasharray': [2, 2]
        }
    });


    map.addLayer({
        'id': 'point',
        'source': 'point',
        'type': 'symbol',
        'layout': {
            'icon-image': 'pulsing-dot',
            'icon-allow-overlap': false,
            'icon-ignore-placement': true
        }
    });


    fitMap(map, coords);

    function animate() {

        counter = counter + 1;
        var start =
            route.features[0].geometry.coordinates[
                counter >= steps ? counter - 1 : counter
            ];
        var end =
            route.features[0].geometry.coordinates[
                counter >= steps ? counter : counter + 1
            ];
        if (!start || !end) return;

        // Update point geometry to a new position based on counter denoting
        // the index to access the arc
        point.features[0].geometry.coordinates =
            route.features[0].geometry.coordinates[counter];

        // Calculate the bearing to ensure the icon is rotated to match the route arc
        // The bearing is calculated between the current point and the next point, except
        // at the end of the arc, which uses the previous point and the current point
        point.features[0].properties.bearing = turf.bearing(
            turf.point(start),
            turf.point(end)
        );

        // Update the source with this new data
        map.getSource('point').setData(point);

        // Request the next frame of animation as long as the end has not been reached
        if (counter < steps) {
            requestAnimationFrame(animate);
        }

        counter = counter + 1;
    }

    document
        .getElementById('replay')
        .addEventListener('click', function () {
            // Set the coordinates of the original point back to origin
            point.features[0].geometry.coordinates = origin;

            // Update the source layer
            map.getSource('point').setData(point);

            // Reset the counter
            counter = 0;

            // Restart the animation
            animate(counter);
        });

    // Start the animation
    animate(counter);
});

function fitMap(map, coords) {
    var bounds = coords.reduce(function (bounds, coord) {
        return bounds.extend(coord);
    }, new mapboxgl.LngLatBounds(coords[0], coords[0]));
    map.fitBounds(bounds, {
        padding: 100
    });
}

Answer 1

您可以添加另一个与之前的航点具有相同坐标的航点。我在下面称它为 breakpoint：

var origin = [6.157903, 45.361839];
var waypoint1 = [6.157956, 45.361699];
var breakpoint = [6.157956, 45.361699];
var waypoint2 = [6.161326, 45.363424];
var waypoint3 = [6.165399, 45.361447];
var waypoint4 = [6.16741, 45.36239];

这是向路线添加航路点的方法

var route = {
    'type': 'FeatureCollection',
    'features': [{
        'type': 'Feature',
        'geometry': {
            'type': 'LineString',
            'coordinates': [origin, waypoint1, breakpoint, waypoint2, waypoint3, waypoint4, destination] // here you can add the additional waypoints
        }
    }]
};

现在开始动画。路线分为几步。步骤越多越流畅

对于每一步，都会向 arc 对象添加一个坐标。在 arc 中的每个位置之间，动画将以相同的时间移动标记。

因此，要使标记停在某个位置，您必须将坐标添加到带有停靠点位置的 arc 对象。

我在这里这样做：

var arc = [];

    // Number of steps to use in the arc and animation, more steps means
    // a smoother arc and animation, but too many steps will result in a
    // low frame rate
    var steps = 500;

    // Draw an arc between the `origin` & `destination` of the two points
    for (var i = 0; i < lineDistance; i += lineDistance / steps) {
        var segment = turf.along(route.features[0], i);
        arc.push(segment.geometry.coordinates);
        
        
        // logic to add additional coordinates to the arc, with coordinates of the waypoint
        if((segment.geometry.coordinates[0] < waypoint1[0] + 0.5 && segment.geometry.coordinates[0] > waypoint1[0] - 0.5) && (segment.geometry.coordinates[1] < waypoint1[1] + 0.5 && segment.geometry.coordinates[1] > waypoint1[1] - 0.5)){
            for(var i2 = 0; i2 < 10; i2 ++){
                arc.push(waypoint1);
            }
        }
    }
    
    //update steps
    steps = arc.length;

您可以通过增加在路点位置被推入弧形的元素数量来增加停留在路点的持续时间。这是我的完整代码。请将您的访问令牌输入运行它。

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Animate a point along a route</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://api.mapbox.com/mapbox-gl-js/v2.0.1/mapbox-gl.js"></script>
<link href="https://api.mapbox.com/mapbox-gl-js/v2.0.1/mapbox-gl.css" rel="stylesheet" />
<style>
    body { margin: 0; padding: 0; }
    #map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
    .overlay {
        position: absolute;
        top: 10px;
        left: 10px;
    }

    .overlay button {
        font: 600 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
        background-color: #3386c0;
        color: #fff;
        display: inline-block;
        margin: 0;
        padding: 10px 20px;
        border: none;
        cursor: pointer;
        border-radius: 3px;
    }

    .overlay button:hover {
        background-color: #4ea0da;
    }
</style>
<script src="https://cdn.jsdelivr.net/npm/@turf/turf@5/turf.min.js"></script>

<div id="map"></div>
<div class="overlay">
    <button id="replay">Replay</button>
</div>

<script>
    mapboxgl.accessToken = 'YOUR ACCESS TOKEN';
    var map = new mapboxgl.Map({
        container: 'map',
        style: 'mapbox://styles/mapbox/streets-v11',
        center: [-96, 37.8],
        zoom: 3
    });

    // San Francisco
    var origin = [-122.414, 37.776];

    var waypoint1 = [-100.032, 38.913];
    
    // Washington DC
    var destination = [-77.032, 38.913];
    
    

    // A simple line from origin to destination.
    var route = {
        'type': 'FeatureCollection',
        'features': [
            {
                'type': 'Feature',
                'geometry': {
                    'type': 'LineString',
                    'coordinates': [origin, waypoint1, destination]
                }
            }
        ]
    };

    // A single point that animates along the route.
    // Coordinates are initially set to origin.
    var point = {
        'type': 'FeatureCollection',
        'features': [
            {
                'type': 'Feature',
                'properties': {},
                'geometry': {
                    'type': 'Point',
                    'coordinates': origin
                }
            }
        ]
    };

    // Calculate the distance in kilometers between route start/end point.
    var lineDistance = turf.length(route.features[0]);

    var arc = [];

    // Number of steps to use in the arc and animation, more steps means
    // a smoother arc and animation, but too many steps will result in a
    // low frame rate
    var steps = 500;

    // Draw an arc between the `origin` & `destination` of the two points
    for (var i = 0; i < lineDistance; i += lineDistance / steps) {
        var segment = turf.along(route.features[0], i);
        arc.push(segment.geometry.coordinates);
        
        if((segment.geometry.coordinates[0] < waypoint1[0] + 0.5 && segment.geometry.coordinates[0] > waypoint1[0] - 0.5) && (segment.geometry.coordinates[1] < waypoint1[1] + 0.5 && segment.geometry.coordinates[1] > waypoint1[1] - 0.5)){
            for(var i2 = 0; i2 < 10; i2 ++){
                arc.push(waypoint1);
            }
        }
    }
    
    //update steps
    steps = arc.length;

    // Update the route with calculated arc coordinates
    route.features[0].geometry.coordinates = arc;

    // Used to increment the value of the point measurement against the route.
    var counter = 0;

    map.on('load', function () {
        // Add a source and layer displaying a point which will be animated in a circle.
        map.addSource('route', {
            'type': 'geojson',
            'data': route
        });

        map.addSource('point', {
            'type': 'geojson',
            'data': point
        });

        map.addLayer({
            'id': 'route',
            'source': 'route',
            'type': 'line',
            'paint': {
                'line-width': 2,
                'line-color': '#007cbf'
            }
        });

        map.addLayer({
            'id': 'point',
            'source': 'point',
            'type': 'symbol',
            'layout': {
                'icon-image': 'airport-15',
                'icon-rotate': ['get', 'bearing'],
                'icon-rotation-alignment': 'map',
                'icon-allow-overlap': true,
                'icon-ignore-placement': true
            }
        });

        function animate() {
            var start =
                route.features[0].geometry.coordinates[
                    counter >= steps ? counter - 1 : counter
                ];
            var end =
                route.features[0].geometry.coordinates[
                    counter >= steps ? counter : counter + 1
                ];
            if (!start || !end) return;

            // Update point geometry to a new position based on counter denoting
            // the index to access the arc
            point.features[0].geometry.coordinates =
                route.features[0].geometry.coordinates[counter];

            // Calculate the bearing to ensure the icon is rotated to match the route arc
            // The bearing is calculated between the current point and the next point, except
            // at the end of the arc, which uses the previous point and the current point
            point.features[0].properties.bearing = turf.bearing(
                turf.point(start),
                turf.point(end)
            );

            // Update the source with this new data
            map.getSource('point').setData(point);

            // Request the next frame of animation as long as the end has not been reached
            if (counter < steps) {
                requestAnimationFrame(animate);
            }

            counter = counter + 1;
        }

        document
            .getElementById('replay')
            .addEventListener('click', function () {
                // Set the coordinates of the original point back to origin
                point.features[0].geometry.coordinates = origin;

                // Update the source layer
                map.getSource('point').setData(point);

                // Reset the counter
                counter = 0;

                // Restart the animation
                animate(counter);
            });

        // Start the animation
        animate(counter);
    });
</script>

</body>
</html>

Mapbox javascript : 在移动的标记处打个断（模拟红绿灯）

Mapbox javascript : to make a break at the marker that moves (simulation red traffic light)

javascript

animation

marker

mapbox