[Mapbox GL]高亮包含相似数据的特性

最新推荐文章于 2025-05-09 15:32:57 发布

龙虾天天

最新推荐文章于 2025-05-09 15:32:57 发布

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分类专栏： Mapbox 文章标签： Mapbox

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本文介绍如何使用Mapbox GL JS实现地图上相同名称区域的高亮显示及信息查询功能。通过鼠标悬停交互，可以高亮显示地图上所有具有相同郡名的区域，并展示这些区域的总人口数。

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鼠标悬停在某个郡上面时，高亮使用相同郡名的其他郡

<!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>

<style>
.map-overlay {
    font: 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
    background-color: #fff;
    box-shadow: 0 1px 2px rgba(0,0,0,0.10);
    border-radius: 3px;
    position: absolute;
    width: 25%;
    top: 10px;
    left: 10px;
    padding: 10px;
    display: none;
}
</style>

<div id='map'></div>
<div id='map-overlay' class='map-overlay'></div>

<script>
mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/streets-v9',
    center: [-98, 38.88],
    minZoom: 2,
    zoom: 3
});

var overlay = document.getElementById('map-overlay');

// Create a popup, but don't add it to the map yet.
var popup = new mapboxgl.Popup({
    closeButton: false
});

map.on('load', function() {
    // Add the source to query. In this example we're using
    // county polygons uploaded as vector tiles
    map.addSource('counties', {
        "type": "vector",
        "url": "mapbox://mapbox.82pkq93d"
    });

    map.addLayer({
        "id": "counties",
        "type": "fill",
        "source": "counties",
        "source-layer": "original",
        "paint": {
            "fill-outline-color": "rgba(0,0,0,0.1)",  /* 轮廓颜色 */
            "fill-color": "rgba(0,0,0,0.1)"           /* 填充颜色 */
        }
    }, 'place-city-sm'); // Place polygon under these labels.

    map.addLayer({
        "id": "counties-highlighted",
        "type": "fill",
        "source": "counties",
        "source-layer": "original",
        "paint": {
            "fill-outline-color": "#484896",
            "fill-color": "#6e599f",
            "fill-opacity": 0.75        /* 填充透明度 */
        },
        "filter": ["in", "COUNTY", ""]  /* 数据过滤器 */
    }, 'place-city-sm'); // Place polygon under these labels.

    map.on('mousemove', function(e) {   /* mousemove 鼠标指针移动时发生 */
        var features = map.queryRenderedFeatures(e.point, {    /* queryRenderedFeatures  ([geometry], [parameters])：在特定的几何形状内查询满足条件的可视化的GeoJSON特性对象数组  */
            layers: ['counties']
        });

        // Change the cursor style as a UI indicator.
        map.getCanvas().style.cursor = features.length ? 'pointer' : '';  /* 设置鼠标样式 */

        // Remove things if no feature was found.
        if (!features.length) {
            popup.remove();
            map.setFilter('counties-highlighted', ['in', 'COUNTY', '']);  /* 更新数据过滤器 */
            overlay.style.display = 'none';       /* 隐藏该标签 */
            return;
        }

        // Single out the first found feature on mouseove.
        var feature = features[0];

        // Query the counties layer visible in the map. Use the filter
        // param to only collect results that share the same county name.
        var relatedFeatures = map.querySourceFeatures('counties', {    /* querySourceFeatures  (sourceID, [parameters])：在GeoJSON source或者矢量瓦片内查询满足条件的GeoJSON特性对象数组 */
            sourceLayer: 'original',
            filter: ['in', 'COUNTY', feature.properties.COUNTY]  /* ["in", key, v0, ..., vn] set inclusion: feature[key] ∈ {v0, ..., vn} */
        });

        // Render found features in an overlay.
        overlay.innerHTML = '';

        // Total the population of all features
        var populationSum = relatedFeatures.reduce(function(memo, feature) {
            return memo + feature.properties.population;
        }, 0);

        var title = document.createElement('strong');
        title.textContent = feature.properties.COUNTY + ' (' + relatedFeatures.length + ' found)';  /* 更新文本内容 */

        var population = document.createElement('div');
        population.textContent = 'Total population: ' + populationSum.toLocaleString();

        overlay.appendChild(title);
        overlay.appendChild(population);
        overlay.style.display = 'block';

        // Add features that share the same county name to the highlighted layer.
        map.setFilter('counties-highlighted', ['in', 'COUNTY', feature.properties.COUNTY]);   /* 更新高亮layer的过滤器，显示相关数据 */

        // Display a popup with the name of the county
        popup.setLngLat(e.lngLat)
            .setText(feature.properties.COUNTY)
            .addTo(map);
    });
});
</script>

</body>
</html>

原文：https://www.mapbox.com/mapbox-gl-js/example/query-similar-features/