百度地图MapVGL的柱状体图层 – 北京炫码科技有限公司

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">
    <title>MapVGL</title>
    <meta http-equiv="X-UA-Compatible" content="IE=Edge">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <style>
    html,
    body {
        width: 100%;
        height: 100%;
        margin: 0;
        padding: 0;
    }
    #map_container {
        width: 100%;
        height: 100%;
        margin: 0;
    }
    </style>
    <script src="//api.map.baidu.com/api?v=1.0&type=webgl&ak=1XjLLEhZhQNUzd93EjU5nOGQ"></script>
    <script src="static/common.js"></script>
    <script src="//mapv.baidu.com/build/mapv.min.js"></script>
    <script src="https://code.bdstatic.com/npm/mapvgl@1.0.0-beta.106/dist/mapvgl.min.js"></script>
</head>
<body>
    <div id="map_container"></div>
    <script>
    /* global BMapGL */

    /* global mapv */

    /* global mapvgl */

    /* global initMap */

    /* global darkStyle */

    var map = initMap({
        tilt: 40,
        heading: 0,
        center: [109.792816,27.702774],
        zoom: 6,
        style: darkStyle,
        skyColors: [
            // 地面颜色
            'rgba(226, 237, 248, 0)',
            // 天空颜色
            'rgba(186, 211, 252, 1)'
        ]
    });

    var data = [];

    var citys = [
        '北京', '天津', '石家庄',
        '太原', '上海', '重庆', '呼和浩特',
        '长春', '沈阳', '济南', '南京', '合肥', '杭州', '南昌', '福州', '郑州',
        '武汉', '长沙', '广州', '南宁', '西安'
    ];

    var randomCount = citys.length;

    // 构造数据
    while (randomCount--) {
        var cityCenter = mapv.utilCityCenter.getCenterByCityName(citys[randomCount]);
        data.push({
            geometry: {
                type: 'Point',
                coordinates: [cityCenter.lng, cityCenter.lat]
            },
            value: [
                Math.random() * 100 + 50,
                Math.random() * 100 + 100,
                Math.random() * 100 + 200,
                Math.random() * 100 + 300
                ],
            // 设置总高度，每段会根据比例生成各自的高度
            // height: 200 * 1000 + Math.random() * 200 * 1000,
            // 同时支持函数设置和数组
            height: function (value, index, array) {
                return value * 500;
            },
            size: 20 * 1000,
            color: ['rgba(0, 100, 255, 1)', 'rgba(0, 200, 200, 1)', 'rgba(0, 200, 100, 1)', 'rgba(255, 220, 0, 1)']
        });
    }

    var view = new mapvgl.View({
        map: map
    });

    var layer = new mapvgl.BarLayer({
        // size: 20 * map.getZoomUnits(),
        // 柱体的边数，可设置较大值趋近圆柱
        edgeCount: 50,
        // color: ['blue', 'green', 'yellow', 'red']
        // color: function (value, index, array) {
        //     var max = 0;
        //     var min = 0;
        //     array.forEach(function (a) {
        //         if (max < a) {
        //             max = a;
        //         }
        //         if (min > a) {
        //             min = a;
        //         }
        //     });
        //     let val = parseInt(value / (max - min) * 255, 10);
        //     return 'rgba( 0, ' + val + ',' + (255 - val) + ', 1)';
        // }
    });
    view.addLayer(layer);
    layer.setData(data);

    var lightLayer = new mapvgl.BarLayer({
        type: 'light',
        height: 200 * 1000,
        edgeCount: 50,
        size: 20 * 1000
    });
    view.addLayer(lightLayer);
    lightLayer.setData(
        ['银川', '兰州', '西宁', '乌鲁木齐', '成都', '贵阳', '昆明', '拉萨'].map(function (item) {
            var cityCenter = mapv.utilCityCenter.getCenterByCityName(item);
            return {
                geometry: {
                    type: 'Point',
                    coordinates: [cityCenter.lng, cityCenter.lat]
                },
                value: Math.random() * 100 + 50
            };
        })
    );

    </script>
</body>
</html>
点此查看百度地图MapVGL的柱状体图层