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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, #main1 {
                width: 100%;
                height: 1200px;
                margin: 20px 0;
            }
        </style>
        <h3>Polar bar series label positions</h3>
        <div id="main0"></div>
        <div id="main1"></div>
        <script>

            require(['echarts'], function (echarts) {
                function setChart(chartIndex) {
                    var positions = [
                        'start', 'insideStart',
                        'middle',
                        'insideEnd','end',
                        'inside', 'outside'
                    ];

                    var chart = echarts.init(document.getElementById('main' + chartIndex));
                    var rows = 3;
                    var cols = 3;

                    var angleAxis = [];
                    var radiusAxis = [];
                    var polar = [];
                    var series = [];
                    var title = [];
                    var cnt = positions.length;
                    for (var i = 0; i < rows; ++i) {
                        for (var j = 0; j < cols; ++j) {
                            var id = i * cols + j;
                            if (id >= cnt) {
                                break;
                            }
                            angleAxis.push({
                                max: 4,
                                polarIndex: id,
                                startAngle: 75
                            });
                            radiusAxis.push({
                                polarIndex: id,
                                type: 'category',
                                data: ['a', 'b', 'c', 'd'],
                                startAngle: 75
                            });
                            polar.push({
                                center: [
                                    100 / cols * (j + 0.5) + '%',
                                    100 / rows * (i + 0.5) + '%'
                                ],
                                radius: [
                                    chartIndex ? 10 : 30,
                                    100 / rows * 0.75 + '%'
                                ]
                            });
                            series.push({
                                type: 'bar',
                                data: [
                                    chartIndex ? 0.5 : 2,
                                    1.2,
                                    2.4, 3.6
                                ],
                                coordinateSystem: 'polar',
                                polarIndex: id,
                                label: {
                                    show: true,
                                    position: positions[id],
                                    formatter: '{b}: {c}',
                                    borderColor: '#0ff',
                                    borderWidth: 2,
                                    // rotate:
                                }
                            });
                            title.push({
                                text: positions[id],
                                left: 100 / cols * (j + 0.5) + '%',
                                top: 100 / rows * (i + 0.92) + '%',
                                textAlign: 'center'
                            });
                        }
                    }

                    chart.setOption({
                        title: title,
                        angleAxis: chartIndex ? angleAxis : radiusAxis,
                        radiusAxis: chartIndex ? radiusAxis : angleAxis,
                        polar: polar,
                        tooltip: {},
                        series: series,
                        backgroundColor: '#fff',
                        animation: 0
                    });
                }

                setChart(0);
                setChart(1);
            });
        </script>
    </body>
</html>