test/tree-roam.html

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<html>
    <head>
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1" />
        <script src="lib/simpleRequire.js"></script>
        <script src="lib/config.js"></script>
        <script src="lib/jquery.min.js"></script>
    </head>
    <body>
        <style>
            html, body, #main {
                width: 100%;
                padding: 0;
                margin: 0;
                height: 100%;
            }
        </style>
        <div id="main"></div>
        <script>
            require([
                'echarts',
                './data/flare.json'
            ], function (echarts, data) {
                var chart = echarts.init(document.getElementById('main'));

                window.onresize = function () {
                    chart.resize();
                };

                chart.setOption({

                    tooltip: {
                        trigger: 'item',
                        triggerOn: 'mousemove'
                    },

                    series:[
                        {
                            type: 'tree',

                            data: [data],

                            top: '18%',
                            bottom: '14%',

                            roam: true,
                            // roam: 'scale',
                            // roam: 'move',

                            layout: 'radial',

                            symbol: 'emptyCircle',

                            symbolSize: 7,

                            initialTreeDepth: 3,

                            animationDurationUpdate: 750

                        }
                    ]
                });
            });
        </script>
    </body>
</html>