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   http://www.apache.org/licenses/LICENSE-2.0

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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>
        <script src="lib/facePrint.js"></script>
        <script src="lib/testHelper.js"></script>
        <script src="lib/dat.gui.min.js"></script>
        <link rel="stylesheet" href="lib/reset.css" />
    </head>
    <body>
        <style>
            body {
                background-color: #eee;
                text-align: center;
                padding-top: 20px;
            }
            .chart {
                border-radius: 5px;
                box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
                margin: 20px auto;
                width: 360px;
                height: 200px;
                background-color: #fff;
                text-align: left;
            }
            .dg {
                text-align: left;
            }
        </style>


        <div id="main0"></div>


        <script>
        require(['echarts'], function (echarts) {
            const datas = [
                ////////////////////////////////////////
                [
                    { name: '圣彼得堡来客', value: 5.6 },
                    { name: '陀思妥耶夫斯基全集', value: 1 },
                    { name: '史记精注全译（全6册）', value: 0.8 },
                    { name: '加德纳艺术通史', value: 0.5 },
                    { name: '表象与本质', value: 0.5 },
                    { name: '其它', value: 3.8 }
                ],

                // ////////////////////////////////////////
                [
                    { name: '银河帝国5：迈向基地', value: 3.8 },
                    { name: '俞军产品方法论', value: 2.3 },
                    { name: '艺术的逃难', value: 2.2 },
                    { name: '第一次世界大战回忆录（全五卷）', value: 1.3 },
                    { name: 'Scrum 精髓', value: 1.2 },
                    { name: '其它', value: 5.7 }
                ],

                ////////////////////////////////////////
                [
                    { name: '克莱因壶', value: 3.5 },
                    { name: '投资最重要的事', value: 2.8 },
                    { name: '简读中国史', value: 1.7 },
                    { name: '你当像鸟飞往你的山', value: 1.4 },
                    { name: '表象与本质', value: 0.5 },
                    { name: '其它', value: 3.8 }
                ]
            ];

            const charts = [];

            datas.forEach(function (data) {
                const dom = document.createElement('div');
                dom.classList.add('chart');
                document.querySelector('#main0').appendChild(dom);

                const chart = echarts.init(dom);
                chart.setOption({
                    // color: ['#1B2550', '#2A3566', '#2B3C87', '#4853A7', '#858ED8', '#858ED8', '#A3ABEE'],
                    title: {
                        text: '阅读书籍分布',
                        left: 'center',
                        textStyle: {
                            color: '#999',
                            fontWeight: 'normal',
                            fontSize: 14
                        }
                    },
                    series: [{
                        type: 'pie',
                        radius: [20, 60],
                        itemStyle: {
                            borderColor: '#fff',
                            borderWidth: 1
                        },
                        label: {
                            alignTo: 'edge',
                            formatter: '{name|{b}}\n{time|{c} 小时}',
                            minMargin: 5,
                            edgeDistance: 10,
                            lineHeight: 15,
                            rich: {
                                time: {
                                    fontSize: 10,
                                    color: '#999'
                                }
                            }
                        },
                        labelLine: {
                            length: 15,
                            length2: 0,
                            maxSurfaceAngle: 80
                        },
                        labelLayout: function (params) {
                            const isLeft = params.labelRect.x < chart.getWidth() / 2;
                            const points = params.labelLinePoints;
                            // Update the end point.
                            points[2][0] = isLeft
                                ? params.labelRect.x
                                : params.labelRect.x + params.labelRect.width;

                            return {
                                labelLinePoints: points
                            }
                        },
                        data: data
                    }]
                });

                charts.push(chart);
            });

            const gui = new dat.GUI();
            const config = {
                labelLine: {
                    smooth: 0,
                    maxSurfaceAngle: 80
                },
                label: {
                    edgeDistance: 10
                }
            };

            function update() {
                charts.forEach(function (chart) {
                    chart.setOption({
                        series: {
                            label: Object.assign({}, config.label, {
                                edgeDistance: config.label.edgeDistance
                            }),
                            labelLine: config.labelLine
                        }
                    });
                });
            }

            const labelFolder = gui.addFolder('label');
            const labelLineFolder = gui.addFolder('labelLine');
            labelFolder.open();
            labelLineFolder.open();
            labelFolder.add(config.label, 'edgeDistance', 0, 50).onChange(update);
            labelLineFolder.add(config.labelLine, 'maxSurfaceAngle', 0, 90).onChange(update);
            labelLineFolder.add(config.labelLine, 'smooth', 0, 1).onChange(update);
        });
        </script>


    </body>
</html>