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<html>
    <head>
        <meta charset='utf-8'>
        <script src='lib/esl.js'></script>
        <script src='lib/config.js'></script>
        <script src='lib/jquery.min.js'></script>
        <script src="lib/dat.gui.min.js"></script>
        <meta name='viewport' content='width=device-width, initial-scale=1' />
    </head>
    <body>
        <style>
            html, body, #main {
                background: #111;
                width: 100%;
                height: 100%;
                margin: 0;
            }
        </style>
        <div id='main'></div>
        <script>

        var xs = [440000, 450000];
        var ys = [4368000, 4537000];

        // var dataURL = '../../data-online/figshare_Urban_Road_Network/public/links_ny.bin';
        // var dataURL = '../../echarts-worker/example/data/links_ny.bin';
        // var dataURL = '../../echarts-worker/example/data/Links_NewYork_1.json';
        // var dataURL = 'https://echarts.apache.org/zh/resource/data/figshare_Urban_Road_Network/public/Links_NewYork_1.json';


        require([
            'echarts', 'map/js/world'
        ], function (echarts) {

            var config = {
                dataLoading: 'whole',
                progressive: 40000,
                progressiveThreshold: 3000,
                largeModel: true
            };


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

            var CHUNK_COUNT = 32;

            var dataCount = 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++;
                        }
                    }

                    myChart.appendData({
                        seriesIndex: 0,
                        data: data
                    });

                    dataCount += addedDataCount;

                    fetchData(idx + 1);
                }

                xhr.send();
            }

            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 Float64Array(),
                    polyline: true,
                    large: true,

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

            fetchData(0);

            myChart.setOption(option);


        });

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