Mapbox.js API自动缩放为GeoJSON

Mapbox .js API Auto Zoom to GeoJSON

本文关键字：缩放 GeoJSON js API Mapbox      更新时间：2023-09-26

我有一个简单的页面，其中有一个基于mapbox的映射，使用GeoJSON填充所需的LineStrings。我正在寻找一种在每次加载地图时自动设置范围的方法。目前，我正在计算最大和最小纬度/经度，并以这种方式设置视图，但在这样做时，我仍然需要定义缩放级别。我已经看到了一些与设置边界有关的函数，但在仍然使用GeoJSON的情况下，我似乎无法做到这一点。有什么建议吗？

    <script>
    L.mapbox.accessToken = '[removed]';
    var geojson = [
                {
                "type": "Feature",
                "properties": {
                    "stroke": "#0324a7",
                    "stroke-width": 2,
                    "stroke-opacity": 1
                },
                "geometry": {
                    "type": "LineString",
                    "coordinates": [    [-123.116589,49.209164],[-123.117103,49.208972],[...removed for clarity...],[-123.111908,49.284047] ]
                },
                "properties": {
                    "title": "10 DOWNTOWN",
                    "stroke": "#0324a7",
                    "stroke-width": 5,
                    "stroke-opacity": 1
                }
            },
                {
                "type": "Feature",
                "properties": {
                    "stroke": "#0324a7",
                    "stroke-width": 2,
                    "stroke-opacity": 1
                },
                "geometry": {
                    "type": "LineString",
                    "coordinates": [    [-123.134782,49.203239],[-123.135147,49.203328],[-123.135894,49.203637],[-123.136782,49.203951],[-123.138169,49.204423],[-123.138759,49.20457],[-123.139587,49.204862],[-123.140005,49.205046],[-123.140243,49.205186],[-123.140395,49.205325],[-123.140532,49.205506],[-123.140631,49.205792],[-123.140586,49.20707],[-123.140534,49.208535],[-123.140463,49.210515],[-123.140448,49.210886],[-123.140432,49.211372],[-123.140401,49.212256],[-123.14037,49.213145],[-123.140369,49.213145],[-123.14036,49.213735],[-123.140355,49.213998],[-123.140776,49.214006],[-123.140789,49.213746] ]
                },
                "properties": {
                    "title": "10 GRANVILLE TO 63RD",
                    "stroke": "#0324a7",
                    "stroke-width": 5,
                    "stroke-opacity": 1
                }
            },
                {
                "type": "Feature",
                "properties": {
                    "stroke": "#0324a7",
                    "stroke-width": 2,
                    "stroke-opacity": 1
                },
                "geometry": {
                    "type": "LineString",
                    "coordinates": [    [-123.134782,49.203239],[-123.135147,49.203328],[...removed for clarity...],[-123.127194,49.277803],[-123.128135,49.278406] ]
                },
                "properties": {
                    "title": "10 TO DAVIE",
                    "stroke": "#0324a7",
                    "stroke-width": 5,
                    "stroke-opacity": 1
                }
            },
                {
                "type": "Feature",
                "properties": {
                    "stroke": "#0324a7",
                    "stroke-width": 2,
                    "stroke-opacity": 1
                },
                "geometry": {
                    "type": "LineString",
                    "coordinates": [    [-123.134782,49.203239],[-123.135147,49.203328],[...removed for clarity...],[-123.116191,49.281213],[-123.117871,49.280109],[-123.118797,49.280722],[-123.119815,49.281368] ]
                },
                "properties": {
                    "title": "10 TO ROBSON",
                    "stroke": "#0324a7",
                    "stroke-width": 5,
                    "stroke-opacity": 1
                }
            },
                {
                "type": "Feature",
                "properties": {
                    "stroke": "#0324a7",
                    "stroke-width": 2,
                    "stroke-opacity": 1
                },
                "geometry": {
                    "type": "LineString",
                    "coordinates": [    [-123.110919,49.284708],[-123.111908,49.284047],[-123.112864,49.283416],[...removed for clarity...],[-123.116589,49.209164] ]
                },
                "properties": {
                    "title": "10 GRANVILLE",
                    "stroke": "#0324a7",
                    "stroke-width": 2,
                    "stroke-opacity": 1
                }
            },
                {
                "type": "Feature",
                "properties": {
                    "stroke": "#0324a7",
                    "stroke-width": 2,
                    "stroke-opacity": 1
                },
                "geometry": {
                    "type": "LineString",
                    "coordinates": [    [-123.110919,49.284708],[-123.111908,49.284047],[...removed for clarity...],[-123.134852,49.202151] ]
                },
                "properties": {
                    "title": "10 TO MARPOLE",
                    "stroke": "#0324a7",
                    "stroke-width": 2,
                    "stroke-opacity": 1
                }
            }];
    var map = L.mapbox.map('map', 'mapbox.streets');
    map.setView([49.2437385, -123.1258535], 12);

    L.geoJson(geojson, { style: L.mapbox.simplestyle.style }).addTo(map);
</script>

提前感谢！

L.GeoJSON从L.FeatureGroup继承了getBounds方法。你可以用它来获取你的层的边界：

返回要素组的LatLngBounds（根据其子对象的边界和坐标创建）。

http://leafletjs.com/reference.html#featuregroup-获取边界

var geojsonLayer = L.geoJson(geojson, {
    style: L.mapbox.simplestyle.style
}).addTo(map);
var bounds = geojsonLayer.getBounds();

您可以将这些边界与L.mapbox.map（L.map）实例的fitBounds方法一起使用：

设置一个地图视图，该视图包含具有最大缩放级别的给定地理边界。

http://leafletjs.com/reference.html#map-fitbounds

map.fitBounds(bounds);
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