sector

官网扇形：https://echarts.apache.org/zh/option.html#graphic.elements-sector

const elem = {
  id: 'sector-id',
  type: 'sector',
  shape: {
    cx: 8,
    cy: 18,
    r: 20,
    r0: 12,
    startAngle: Math.PI * 0.5,
    endAngle: Math.PI * 0.8,
    clockwise: true
  },
  style: {
    fill: '#1312CD'
  },
  z: 100
};