rect

官网矩形：https://echarts.apache.org/zh/option.html#graphic.elements-rect

const rectObj = {
  id: 'rect_id',
  type: 'rect',
  style: {
    fill: {
      type: 'linear',
      x: 0,
      y: 0,
      x2: 1,
      y2: 0,
      colorStops: [
        {
          offset: 0, color: 'yellow'
        },
        {
          offset: 1, color: 'pink'
        }
      ]
    }
  },
  shape: {
    x: 20,
    y: 20,
    width: 40,
    height: 60,
    r: 2
  },
  textContent: {
    style: {
      text: 'rect',
      fill: '#ffffff',
      fontSize: 12,
      font: 'Microsoft YaHei',
      fontWeight: 400,
      lineHeight: 32
    },
    z: 100
  },
  textConfig: {
    position: 'inside'
  },
  z: 100
};