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Pie (and other) charts with label going outside of canvas

See original GitHub issue

问题简述 (One-line summary)

Pie charts with sections with long name have the labels that overlap / go out of the canvas (so no more visible)

版本及环境 (Version & Environment)

ECharts 版本 3.2.3:
Chrome 52.0.2743.116 (64-bit):
MAC OS-X El Capitan 10.11.6 (OS Version):

重现步骤 (Steps to reproduce)

Create a pie chart with several sections with long labels (PROBLEM)
Reduce the page size and reload (Same Problem and often overlap)

期望结果 (Expected behaviour)

The labels should stay visible even when they are too long.

可能哪里有问题 (What went wrong)

The labels are not visible and often overlap

ECharts配置项 (ECharts option)

            scope.distributionEvent = {
                identity: $echarts.generateInstanceIdentity(),
                dimension: '10:4',
                config: {
                    tooltip: {
                        trigger: 'item',
                        formatter: "{b} : {c} ({d}%)",
                        zlevel: 2,
                        z: 100
                    },
                    series: [
                        {
                            name: "Event distribution",
                            type: 'pie',
                            radius: ['60%', '70%'],
                            center: ['50%', '55%'],
                            itemStyle : {
                                normal : {
                                    label : {
                                        show : true
                                    },
                                    labelLine : {
                                        show : true,
                                        length: 5
                                    }
                                }
                            },
                            data: [{"name":"New investment","value":6},{"name":"Merger and Acquisition","value":9},{"name":"Bankruptcy","value":3},{"name":"New business relation","value":8},{"name":"Official resignations and appointments","value":1},{"name":"End of activity","value":1},{"name":"New market","value":2},{"name":"New product","value":3},{"name":"New unit","value":1}]
                        }
                    ]
                }
            };