水球图内阴影

描述:当前是关于Echarts图表中的 水球图 示例。
 
            option = {
    backgroundColor:'black',
    series:[{
        type: 'liquidFill',
        radius: '80%',
        data: [0.6, 0.4],
        backgroundStyle: {
          color: {
            type: 'radial',
            x: 0.5,
            y: 0.5,
            r: 0.5,
            colorStops: [{
              offset: 0,
              color: 'rgba(0,24,55, 0)'
            },
            {
              offset: 0.75,
              color: 'rgba(0,24,55, 0)'
            },
            {
              offset: 1,
              color: 'rgba(37,237,259, 1)'
            }],
            globalCoord: false
          },
        },
        outline: {
          borderDistance: 0,
          itemStyle: {
            borderWidth: 0,
            borderColor: {
              type: 'linear',
              x: 0,
              y: 0,
              x2: 0,
              y2: 1,
              colorStops: [{
                offset: 0,
                color: 'rgba(50,115,256, 1)'
              }, {
                offset: 0.5,
                color: 'rgba(50,115,233, .75)'
              }, {
                offset: 1,
                color: 'rgba(50,115,233, 1)'
              }],
              globalCoord: false
            },
          }
        },
        color: ['rgba(37,237,240, 1)', 'rgba(37,200,220, 1)'],
        // color: {
        //   type: 'linear',
        //   x: 0,
        //   y: 0,
        //   x2: 0,
        //   y2: 1,
        //   colorStops: [{
        //     offset: 0,
        //     color: 'rgba(37,237,259, 1)'
        //   }, {
        //     offset: 0.5,
        //     color: 'rgba(0,100,259, 0.5)'
        //   }, {
        //     offset: 1,
        //     color: 'darkblue'
        //   }],
        //   globalCoord: false
        // },
        label: {
          normal: {
            formatter: '',
          },
        },
      }]
};