Index != null) {

                        var srcSector = params.event.target;
                        dragging = new echarts.graphic.Sector({
                            shape: echarts.util.extend({}, srcSector.shape),
                            style: {
                                fill: srcSector.style.fill,
                                opacity: 0.5
                            },
                            silent: true,
                            z: 10000
                        });

           