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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 {
                width: 100%;
                height: 100%;
                margin: 0;
            }
            .chart {
                width: 50%;
                float: left;
                height: 100%;
            }
        </style>
        <div id="main0" class="chart"></div>
        <div id="main1" class="chart"></div>
        <script>

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

                [0.1, 0.9].forEach(function (friction, index) {
                    var chart = echarts.init(document.getElementById('main' + index));

                    function createNodes(count) {
                        var nodes = [];
                        for (var i = 0; i < count; i++) {
                            nodes.push({
                                id: i
                            });
                        }
                        return nodes;
                    }

                    function createEdges(count) {
                        var edges = [];
                        if (count === 2) {
                            return [[0, 1]];
                        }
                        for (var i = 0; i < count; i++) {
                            edges.push([i, (i + 1) % count]);
                        }
                        return edges;
                    }

                    chart.setOption({
                        series: {
                            type: 'graph',
                            layout: 'force',
                            animation: false,
                            data: createNodes(22),
                            width: '50%',
                            height: '50%',
                            force: {
                                layoutAnimation: false,
                                repulsion: 100,
                                edgeLength: 5,
                                friction
                            },
                            edges: createEdges(22).map(function (e) {
                                return {
                                    source: e[0],
                                    target: e[1]
                                };
                            })
                        }
                    });
                });
            });
        </script>
    </body>
</html>