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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>
    </head>
    <body>
        <style>
            html, body, #main {
                width: 100%;
                height: 100%;
                margin: 0;
            }
        </style>
        <div id="main"></div>
        <script>

            require([
                'echarts'
            ], function (echarts) {

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

                var data = [{
                    fixed: true,
                    x: chart.getWidth() / 2,
                    y: chart.getHeight() / 2,
                    symbolSize: 20,
                    id: '-1'
                }];
                var edges = [];
                chart.setOption({
                    series: [{
                        type: 'graph',
                        layout: 'force',
                        animation: false,
                        data: data,
                        force: {
                            // initLayout: 'circular',
                            // gravity: 0
                            repulsion: 100,
                            edgeLength: 5
                        },
                        edges: edges
                    }]
                });

                setInterval(function () {
                    data.push({
                        id: data.length
                    });
                    var source = Math.round((data.length - 1) * Math.random());
                    var target = Math.round((data.length - 1) * Math.random());
                    if (source !== target) {
                        edges.push({
                            source: source,
                            target: target
                        });
                    }
                    chart.setOption({
                        series: [{
                            roam: true,
                            data: data,
                            edges: edges
                        }]
                    });

                    console.log('nodes: ' + data.length);
                    console.log('links: ' + data.length);
                }, 500);
            });
        </script>
    </body>
</html>