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   http://www.apache.org/licenses/LICENSE-2.0

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<html>
    <head>
        <meta charset='utf-8'>
        <script src='../dist/echarts.js'></script>
        <script src="../../echarts-gl/dist/echarts-gl.js"></script>
        <script src='./data/map/js/world.js'></script>
        <meta name='viewport' content='width=device-width, initial-scale=1' />
    </head>
    <body>
        <style>
            html, body, #main {
                width: 100%;
                height: 100%;
                margin: 0;
            }
        </style>
        <div id='main'></div>
        <script>

            var CHUNK_COUNT = 32;

            var dataCount = 0;

            var chart = echarts.init(document.getElementById('main'));

            setOption();
            fetchData(0)

            function fetchData(idx) {
                if (idx >= CHUNK_COUNT) {
                    return;
                }
                var dataURL = `../../echarts-examples/public/data/asset/data/links-ny/links_ny_${idx}.bin`;
                var xhr = new XMLHttpRequest();
                xhr.open('GET', dataURL, true);
                xhr.responseType = 'arraybuffer';

                xhr.onload = function (e) {
                    var rawData = new Float32Array(this.response);
                    var data = new Float64Array(rawData.length - 2);
                    var offsetX = rawData[0];
                    var offsetY = rawData[1];
                    var off = 0;
                    var addedDataCount = 0;
                    for (var i = 2; i < rawData.length;) {
                        var count = rawData[i++];
                        data[off++] = count;
                        for (var k = 0; k < count; k++) {
                            var x = rawData[i++] + offsetX;
                            var y = rawData[i++] + offsetY;
                            data[off++] = x;
                            data[off++] = y;

                            addedDataCount++;
                        }
                    }

                    // setOption(data);
                    chart.appendData({
                        seriesIndex: 0,
                        data: data
                    });

                    dataCount += addedDataCount;

                    fetchData(idx + 1);
                }

                xhr.send();
            }

            function setOption() {

                var option = {
                    progressive: 20000,
                    backgroundColor: '#111',
                    geo: {
                        center: [-74.04327099998152, 40.86737600240287],
                        zoom: 360,
                        map: 'world',
                        roam: true,
                        silent: true,
                        itemStyle: {
                            normal: {
                                color: 'transparent',
                                borderColor: 'rgba(255,255,255,0.1)',
                                borderWidth: 1
                            }
                        }
                    },
                    series: [{
                        type: 'lines',

                        coordinateSystem: 'geo',

                        blendMode: 'lighter',

                        dimensions: ['value'],

                        data: new Float32Array(),
                        polyline: true,
                        large: true,

                        lineStyle: {
                            color: 'orange',
                            width: 0.5,
                            opacity: 0.3
                        }
                    }]
                };

                chart.setOption(option);
            }


        </script>
    </body>
</html>