[Mapbox GL]点击标志改变地图视图中心

最新推荐文章于 2023-07-17 16:46:53 发布

翻译最新推荐文章于 2023-07-17 16:46:53 发布 · 4.6k 阅读

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本文介绍如何使用Mapbox GL JS库中的queryRenderedFeatures和flyTo方法实现点击地图上的符号时，使该符号成为地图的中心。通过添加GeoJSON数据源，并设置相应的图层样式，再利用事件监听来响应用户的点击行为。

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使用queryRenderedFeatures和flyTo使某个标志成为地图中心

<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <title></title>
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.29.0/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.29.0/mapbox-gl.css' rel='stylesheet' />
    <style>
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:100%; }
    </style>
</head>
<body>

<div id='map'></div>
<script>
mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/light-v9',
    center: [-90.96, -0.47],
    zoom: 8
});

map.on('load', function () {

    // add geojson data as a new source
    map.addSource("symbols", {
        "type": "geojson",
        "data": {
            "type": "FeatureCollection",
            "features": [
                {
                    "type": "Feature",
                    "properties": {},
                    "geometry": {
                        "type": "Point",
                        "coordinates": [
                            -91.395263671875,
                            -0.9145729757782163

                        ]
                    }
                },
                {
                    "type": "Feature",
                    "properties": {},
                    "geometry": {
                        "type": "Point",
                        "coordinates": [
                            -90.32958984375,
                            -0.6344474832838974
                        ]
                    }
                },
                {
                    "type": "Feature",
                    "properties": {},
                    "geometry": {
                        "type": "Point",
                        "coordinates": [
                            -91.34033203125,
                            0.01647949196029245
                        ]
                    }
                }
            ]
        }
    });

    // add source as a layer and apply some styles
    map.addLayer({
        "id": "symbols",
        "type": "symbol",
        "source": "symbols",
        "layout": {
            "icon-image": "rocket-15"
        },
        "paint": {}
    });
});

map.on('click', function (e) {
    // Use queryRenderedFeatures to get features at a click event's point
    // Use layer option to avoid getting results from other layers
    var features = map.queryRenderedFeatures(e.point, { layers: ['symbols'] }); /*queryRenderedFeatures([geometry],[parameters])：返回满足查询参数的可视化特征的GeoJSON特征对象， 注意语法格式 */
    // if there are features within the given radius of the click event,
    // fly to the location of the click event
    if (features.length) {   /* features的长度，features是一个数组 */
        // Get coordinates from the symbol and center the map on those coordinates
        map.flyTo({center: features[0].geometry.coordinates}); /* flyTo  (options, [eventData]) */
    }
});


// Use the same approach as above to indicate that the symbols are clickable
// by changing the cursor style to 'pointer'.
map.on('mousemove', function (e) {
    var features = map.queryRenderedFeatures(e.point, { layers: ['symbols'] });  /* e属于MapMouseEvent，point是其属性，表示鼠标event事件的像素坐标 */
    map.getCanvas().style.cursor = features.length ? 'pointer' : '';
});
</script>

</body>
</html>

原文：https://www.mapbox.com/mapbox-gl-js/example/center-on-symbol/