Mapbox ()/fitBounds()

Question

我正在使用MapboxGLJSv0.14.2，我已经在文档中搜索了很多和低的内容，而且对此了解甚少。

如果您使用标准的JS，那么使用它们提供的示例(https://www.mapbox.com/mapbox.js/example/v1.0.0/fit-map-to-markers/)可以很清楚地“将映射到标记”；但是，使用GL时的设置是非常不同的。GL有getBounds() (https://www.mapbox.com/mapbox-gl-js/api/#Map.getBounds)，但是由于没有命名层，比如标准的JS，所以我很难找到如何使用getBounds()。

我找到了这个(Mapbox GL JS API集界限)，但肯定不是正确的答案？

这是我的大部分设置；不包括JSON设置和其他选项。

mapboxgl.accessToken = '<myaccesstoken>';

var markers = <?php echo $programme_json; ?>;

var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/richgc/cikyo5bse00nqb0lxebkfn2bm',
    center: [-1.470085, 53.381129],
    zoom: 15
});

map.on('style.load', function() {
    map.addSource('markers', {
        'type': 'geojson',
        'data': markers
    });

    map.addLayer({
        "id": "markers",
        "interactive": true,
        "type": "symbol",
        "source": "markers",
        "layout": {
            "icon-image": "venue-map-icon-blue",
            'icon-size': 0.5,
            "icon-allow-overlap": true
        }
    });

    map.scrollZoom.disable();

});

我尝试了以下几点：

alert(map.getBounds()); // LngLatBounds(LngLat(-1.4855345239256508, 53.37642500812015), LngLat(-1.4546354760740883, 53.38583247227842))
var bounds = [[-1.4855345239256508, 53.37642500812015],[-1.4546354760740883, 53.38583247227842]]
map.fitBounds(bounds);

因此，我知道如何fitBounds，但我不知道如何让他们map.getBounds()似乎只是返回设定的中心位置lng/lat。

标记JSON：

var markers = {"type":"FeatureCollection","features":[{"type":"Feature","properties":{"title":"Site Gallery","url":"\/Freelance\/art-sheffield-2016\/programme\/site-gallery\/","summary":"Duis arcu tortor, suscipit eget, imperdiet nec, imperdiet iaculis, ipsum. Donec id justo. Aenean tellus metus, bibendum sed, posuere ac, mattis non, nunc. Suspendisse feugiat. Etiam rhoncus.","image":"\/Freelance\/art-sheffield-2016\/site\/assets\/files\/1032\/site_gallery.jpg","marker-symbol":"venue-map-icon-blue","colour":"blue"},"geometry":{"type":"Point","coordinates":["-1.466439","53.376842"]}},{"type":"Feature","properties":{"title":"Moore Street Substation","url":"\/Freelance\/art-sheffield-2016\/programme\/moore-street-substation\/","summary":"","image":null,"marker-symbol":"venue-map-icon-green","colour":"green"},"geometry":{"type":"Point","coordinates":["-1.477881","53.374798"]}},{"type":"Feature","properties":{"title":"S1 Artspace","url":"\/Freelance\/art-sheffield-2016\/programme\/s1-artspace\/","summary":"","image":null,"marker-symbol":"venue-map-icon-red","colour":"red"},"geometry":{"type":"Point","coordinates":["-1.459620","53.380562"]}}]};

Answer 1

如果要将映射与标记相匹配，则可以创建包含所有标记的边界。

var bounds = new mapboxgl.LngLatBounds();

markers.features.forEach(function(feature) {
    bounds.extend(feature.geometry.coordinates);
});

map.fitBounds(bounds);

Answer 2

要获得适用于所有GeoJSON对象的解决方案，而不仅仅是一组标记，请查看Mapbox的Turf.js。

这段代码对我很有帮助：https://bl.ocks.org/danswick/83a8ddff7fb9193176a975a02a896792

但是，为了重复这些基本知识，以防链接消失：

var bounds = turf.bbox(markers);
map.fitBounds(bounds, {padding: 20});

在链接代码中提到的extent方法已经被反对，以支持bbox，但是结果是一样的。

Answer 3

Mapbox自己的地质-范围插件就能做到这一点。假设您的markers对象是有效GeoJSON，您可以简单地将它传递给geojsonExtent()函数，以获得一组边界，然后可以传递给fitBounds()。

一旦加载了geojson-extent.js文件(例如，通过在HTML代码中使用<script>标记)，您应该能够这样做，以便将映射与GeoJSON markers对象的边界相匹配：

map.fitBounds(geojsonExtent(markers));

更新

GeoJSONLint报告说，您的markers对象不是有效的GeoJSON，因为每个位置中的元素被解释为字符串，而不是数字。如果从lon-lat坐标中删除引号，它应该工作得很好：

​

var markers = {
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "title": "Site Gallery",
        "url": "\/Freelance\/art-sheffield-2016\/programme\/site-gallery\/",
        "summary": "Duis arcu tortor, suscipit eget, imperdiet nec, imperdiet iaculis, ipsum. Donec id justo. Aenean tellus metus, bibendum sed, posuere ac, mattis non, nunc. Suspendisse feugiat. Etiam rhoncus.",
        "image": "\/Freelance\/art-sheffield-2016\/site\/assets\/files\/1032\/site_gallery.jpg",
        "marker-symbol": "venue-map-icon-blue",
        "colour": "blue"
      },
      "geometry": {
        "type": "Point",
        "coordinates": [
          -1.466439,
          53.376842
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "title": "Moore Street Substation",
        "url": "\/Freelance\/art-sheffield-2016\/programme\/moore-street-substation\/",
        "summary": "",
        "image": null,
        "marker-symbol": "venue-map-icon-green",
        "colour": "green"
      },
      "geometry": {
        "type": "Point",
        "coordinates": [
          -1.477881,
          53.374798
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "title": "S1 Artspace",
        "url": "\/Freelance\/art-sheffield-2016\/programme\/s1-artspace\/",
        "summary": "",
        "image": null,
        "marker-symbol": "venue-map-icon-red",
        "colour": "red"
      },
      "geometry": {
        "type": "Point",
        "coordinates": [
          -1.459620,
          53.380562
        ]
      }
    }
  ]
};

​