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<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <title>Extrude polygons for 3D indoor mapping</title>
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.54.0/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.54.0/mapbox-gl.css' rel='stylesheet' />
    <style>
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:100%; }
    </style>
</head>
<body>
​
<div id='map'></div>
​
<script>
​
// 參考 3D indoor mapping https://docs.mapbox.com/mapbox-gl-js/example/3d-extrusion-floorplan/
// 此例使用的geojson檔案  https://docs.mapbox.com/mapbox-gl-js/assets/indoor-3d-map.geojson
// 如果將附檔import到自己的Mapbox Studio Dataset進行編輯 https://studio.mapbox.com/datasets/
// 先將地圖位置定於 -87.61694, 41.86625 就能看到效果
// 自行增減繪製建築物的外牆多邊形，並對Property加以設定，然後將匯出的geojson檔案內容複製於此...
var FLOORPLAN = 
{
};
​
mapboxgl.accessToken = 'pk.eyJ1IjoiY2hlbnl1eWkiLCJhIjoiY2l1ZWoxemx6MDAweTJ5cHI3NHNnajR2NiJ9.cNpWK-0HoYbcumuQ8yvbjQ';
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/streets-v11',
    center: [-87.61694, 41.86625],
    zoom: 15.99,
    pitch: 40,
    bearing: 20
});
​
map.on('load', function() {
    map.addLayer({
        'id': 'room-extrusion',
        'type': 'fill-extrusion',
        'source': {
            // GeoJSON Data source used in vector tiles, documented at
            // https://gist.github.com/ryanbaumann/a7d970386ce59d11c16278b90dde094d
            'type': 'geojson',
            'data': FLOORPLAN  // 將原例的此處資料挪到前面定義
        },
        
        // 加上篩選條件表示式 https://docs.mapbox.com/mapbox-gl-js/style-spec/#expressions-!=
        // 只取 'height': 0   https://docs.mapbox.com/mapbox-gl-js/style-spec/#expressions-get
        "filter": ['!=', ["get", "height"], 0],     
        
        'paint': {
            // See the Mapbox Style Specification for details on data expressions.
            // https://docs.mapbox.com/mapbox-gl-js/style-spec/#expressions
​
            // Get the fill-extrusion-color from the source 'color' property.
            'fill-extrusion-color': ['get', 'color'],
​
            // Get fill-extrusion-height from the source 'height' property.
            'fill-extrusion-height': ['get', 'height'],
​
            // Get fill-extrusion-base from the source 'base_height' property.
            'fill-extrusion-base': ['get', 'base_height'],
​
            // Make extrusions slightly opaque for see through indoor walls.
            'fill-extrusion-opacity': 0.5
        }
    });
});
</script>
​
</body>
</html>
 
​
 
​
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