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<html>
    <head>
        <meta charset="utf-8">
        <script src="lib/esl.js"></script>
        <script src="lib/config.js"></script>
    </head>
    <body>
        <style>
            html, body, #main {
                width: 100%;
                height: 100%;
                /* background-image: url(old_mathematics.png); */
                /* background-repeat: repeat; */
            }
            #toolbar {
                position: absolute;
                left: 10px;
                top: 10px;
            }
        </style>
        <div id="main"></div>
        <div id="toolbar">
            <button id="highlight">Highlight</button>
            <button id="downplay">Downplay</button>
        </div>
        <script>
            var chart;
            require([
                'echarts'
            ], function (echarts) {

                chart = echarts.init(document.getElementById('main'), null, {
                    // renderer: 'svg'
                });
                option = {
                    silent: true,
                    series: {
                        radius: ['15%', '80%'],
                        type: 'sunburst',
                        sort: null,
                        highlightPolicy: 'descendant',
                        data: [{
                            value: 10,
                            children: [{
                                name: 'target',
                                value: 4,
                                children: [{
                                    value: 2,
                                    children: [{
                                        value: 1
                                    }]
                                }, {
                                    value: 1
                                }, {
                                    value: 0.5
                                }]
                            }, {
                                value: 2
                            }]
                        }, {
                            value: 4,
                            children: [{
                                children: [{
                                    value: 2
                                }]
                            }]
                        }],
                        label: {
                            rotate: 'none',
                            color: '#fff'
                        },
                        levels: [],
                        itemStyle: {
                            color: 'yellow',
                            borderWidth: 2
                        },
                        emphasis: {
                            itemStyle: {
                                color: 'red'
                            }
                        },
                        highlight: {
                            itemStyle: {
                                color: 'orange'
                            }
                        },
                        downplay: {
                            itemStyle: {
                                color: '#ccc'
                            }
                        }
                    }
                };

                chart.setOption(option);

                document.querySelector('#highlight').onclick = function () {
                    chart.dispatchAction({
                        type: 'sunburstHighlight',
                        targetNodeId: 'target'
                    });
                }
                document.querySelector('#downplay').onclick = function () {
                    chart.dispatchAction({
                        type: 'sunburstUnhighlight',
                        targetNodeId: 'target'
                    });
                }
            });

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