Mapbox GL JS getBounds()/fitBounds() [英] Mapbox GL JS getBounds()/fitBounds()

问题描述

我使用的是Mapbox GL JS v0.14.2，我在文档中搜索了很多内容，对此一无所知.

I'm using Mapbox GL JS v0.14.2 and I've searched high and low through the documentation and very little is clear about this.

如果您使用标准的JS API，则很明显可以使用它们提供的示例将地图适合标记"( https://www.mapbox. com/mapbox-gl-js/api/#Map.getBounds )，但由于您没有命名层(如标准JS API)，因此我正在努力研究如何使用getBounds()完全没有.

If you use the standard JS API, it's very clear to 'fit map to markers' using an example they have provided (https://www.mapbox.com/mapbox.js/example/v1.0.0/fit-map-to-markers/); however the setup when using the GL api is quite different. The GL API has getBounds() (https://www.mapbox.com/mapbox-gl-js/api/#Map.getBounds) but because you don't have a named layer, like the standard JS API, so I'm struggling to work out how to use getBounds() at all.

我已经找到了这个( Mapbox GL JS API设置范围)但肯定不是正确的答案吗?

I've found this (Mapbox GL JS API Set Bounds) but surely can't be the right answer?

这是我设置的大部分内容；排除JSON设置和其他选项.

This is the bulk of my setup; excluding JSON setup and other options.

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();

});

我尝试了以下操作:

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);

所以我知道如何fitBounds，但是我不确定如何获得它们map.getBounds()似乎只是返回设置的中心位置lng/lat.

So I know how to fitBounds, but I'm unsure how to get them map.getBounds() just seems to return the set centre position 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"]}}]};

推荐答案

如果要使地图适合标记，则可以创建包含所有标记的边界.

If you want to fit map to markers, you can create bounds that contains all markers.

var bounds = new mapboxgl.LngLatBounds();

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

map.fitBounds(bounds);

这篇关于Mapbox GL JS getBounds()/fitBounds()的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！