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<html>
    <head>
        <meta charset="utf-8">
        <script src="lib/simpleRequire.js"></script>
        <script src="lib/config.js"></script>
        <meta name="viewport" content="width=device-width, initial-scale=1" />
    </head>
    <body>
        <style>
            #main0 {
                width: 100%;
                height: 1000px;
                margin: 20px 0;
            }
        </style>
        <h3>Pie series label rotate</h3>
        <div id="main0"></div>
        <script>

            require(['echarts'], function (echarts) {
                function setPieChart() {
                    var positions = [
                        'inner', 'center', 'outside'
                    ];
                    var rotates = [
                        undefined,
                        'radial',
                        'tangential',
                        30
                    ];

                    var chart = echarts.init(document.getElementById('main0'));
                    var rows = positions.length;
                    var cols = rotates.length;

                    var series = [];
                    var title = [];
                    for (var i = 0; i < rows; ++i) {
                        for (var j = 0; j < cols; ++j) {
                            series.push({
                                type: 'pie',
                                data: [
                                    2,
                                    1.2,
                                    2.4,
                                    3.6
                                ],
                                label: {
                                    show: true,
                                    position: positions[i],
                                    rotate: rotates[j],
                                    formatter: 'value: {c}',
                                    borderColor: '#0ff',
                                    borderWidth: 2
                                },
                                center: [
                                    100 / cols * (j + 0.5) + '%',
                                    100 / rows * (i + 0.5) + '%'
                                ],
                                radius: [
                                    30,
                                    100 / rows * 0.6 + '%'
                                ]
                            });
                            var rotText = j === 3 ? '30°' : rotates[j];
                            title.push({
                                text: positions[i] + ', rotate: ' + rotText,
                                left: 100 / cols * (j + 0.5) + '%',
                                top: 100 / rows * (i + 0.92) + '%',
                                textAlign: 'center'
                            });
                        }
                    }

                    chart.setOption({
                        title: title,
                        tooltip: {},
                        series: series,
                        backgroundColor: '#fff',
                        animation: 0
                    });
                }
                setPieChart();
            });
        </script>
    </body>
</html>