MapLibre GL JS #033 - レイヤのフィルタ設定

レイヤのフィルタを設定するメモ。

script.js

// MapTiler読み込み
const map = new maplibregl.Map({
    container: 'map',
    style: 'https://api.maptiler.com/maps/jp-mierune-streets/style.json?key=[APIキー]',
    center: [139.767, 35.681],
    zoom: 11,
});

// コントロール関係表示
map.addControl(new maplibregl.NavigationControl());

map.on('load', function () {
    // サークル設定
    map.addSource('point_sample', {
        type: 'geojson',
        data: {
            "type": "FeatureCollection",
            "name": "sample",
            "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
            "features": [
                { "type": "Feature", "properties": { "field01": "一", "field02": "abcd", "field03": 5 }, "geometry": { "type": "Point", "coordinates": [ 139.766778945922852, 35.68198003744061 ] } },
                { "type": "Feature", "properties": { "field01": "二", "field02": null, "field03": 7 }, "geometry": { "type": "Point", "coordinates": [ 139.762916564941406, 35.674310750817348 ] } },
                { "type": "Feature", "properties": { "field01": "三", "field02": "kojsha", "field03": 9 }, "geometry": { "type": "Point", "coordinates": [ 139.763603210449219, 35.691391336319306 ] } }
            ]
        }
    });

    // スタイル設定
    map.addLayer({
        "id": "point_sample",
        "type": "circle",
        "source": "point_sample",
        "layout": {},
        "paint": {
            'circle-color': "#FF0000",
            'circle-radius': 10
        }
    });

    // レイヤのフィルタ設定
    map.setFilter('point_sample', ['==', 'field02', 'kojsha']);
});

MapLibre GL JSを手軽に始めるビルド環境公開しています。
maplibregljs-starter

• 参考文献
  MapLibre GL JS