3D柱状图 悬停变色

const wid = 30
  const w1 = Math.sin(Math.PI / 6) * wid //4
  const w2 = Math.sin(Math.PI / 3) * wid // 6.8
  const snapHeight = wid / 2
  const CubeLeft = echarts.graphic.extendShape({
    shape: {
      x: 0,
      y: 0
    },
    buildPath: function (ctx, shape) {
      const xAxisPoint = shape.xAxisPoint
      const c0 = [shape.x, shape.y]
      const c1 = [shape.x - w2, shape.y]
      const c2 = [shape.x - w2, xAxisPoint[1]]
      const c3 = [shape.x, xAxisPoint[1]]
      ctx
        .moveTo(c0[0], c0[1])
        .lineTo(c1[0], c1[1])
        .lineTo(c2[0], c2[1])
        .lineTo(c3[0], c3[1])
        .closePath()
    }
  })
  // 绘制右侧面
  const CubeRight = echarts.graphic.extendShape({
    shape: {
      x: 0,
      y: 0
    },
    buildPath: function (ctx, shape) {
      const xAxisPoint = shape.xAxisPoint
      const c1 = [shape.x, shape.y]
      const c2 = [shape.x, xAxisPoint[1]]
      const c3 = [shape.x + w1, xAxisPoint[1] - w2 + snapHeight]
      const c4 = [shape.x + w1, shape.y - w2 + snapHeight]
      ctx
        .moveTo(c1[0], c1[1])
        .lineTo(c2[0], c2[1])
        .lineTo(c3[0], c3[1])
        .lineTo(c4[0], c4[1])
        .closePath()
    }
  })
  // 绘制顶面
  const CubeTop = echarts.graphic.extendShape({
    shape: {
      x: 0,
      y: 0
    },
    buildPath: function (ctx, shape) {
      //
      const c1 = [shape.x, shape.y]
      const c2 = [shape.x + w1, shape.y - w2 + snapHeight] //右点
      const c3 = [shape.x - w2 + w1, shape.y - w2 + snapHeight]
      const c4 = [shape.x - w2, shape.y]
      ctx
        .moveTo(c1[0], c1[1])
        .lineTo(c2[0], c2[1])
        .lineTo(c3[0], c3[1])
        .lineTo(c4[0], c4[1])
        .closePath()
    }
  })
  // 三个面图形
  echarts.graphic.registerShape('CubeLeft', CubeLeft)
  echarts.graphic.registerShape('CubeRight', CubeRight)
  echarts.graphic.registerShape('CubeTop', CubeTop)

  let xData = ['2017', '2018', '2019', '2020', '2021']
  let yData = [150, 126, 260, 220, 184]
  var option = {
    // backgroundColor: '#000a3f',
    tooltip: {
      trigger: 'axis',
      axisPointer: {
        type: 'shadow'
      },
      backgroundColor: 'rgba(  4, 48, 72)',
      borderColor: 'rgba(127,208,253)',
      textStyle: {
        color: '#CFE3FC'
      },
      borderWidth: 1,
      formatter: function (params) {
        return '数量' + '<br/>' + params[0].value + '个'
      }
    },
    grid: {
      top: '20%',
      left: '5%',
      bottom: '0%',
      right: '5%',
      containLabel: true
    },
    xAxis: {
      type: 'category',
      data: xData,
      axisLine: {
        show: true,
        lineStyle: {
          color: '#3e6f8e',
          width: 1
        }
      },
      axisTick: {
        show: false,
        length: 9,
        alignWithLabel: false,
        lineStyle: {
          color: '#AAA'
        }
      },
      axisLabel: {
        fontSize: 14,
        margin: 10,
        color: 'white'
      },
      splitLine: {
        show: false,
        lineStyle: {
          color: '#ffffff',
          opacity: 0.2,
          width: 1
        }
      }
    },
    yAxis: {
      name: '单位：个',
      type: 'value',
      nameTextStyle: {
        color: 'white',
        fontSize: 16
      },
      axisLine: {
        show: true,
        lineStyle: {
          color: '#3e6f8e',
          width: 1
        }
      },
      axiosTick: {
        show: false
      },
      axisLabel: {
        color: 'white',
        fontSize: 14,
        margin: 10
      },
      splitLine: {
        show: true,
        lineStyle: {
          color: '#ffffff',
          opacity: 0.2,
          width: 1,
          type: 'dashed'
        }
      },
      nameGap: 20
    },
    series: [
      {
        type: 'bar',
        label: {
          normal: {
            show: true,
            position: 'top',
            fontSize: 16,
            color: '#fff',
            offset: [0, -10]
          }
        },
        tooltip: {
          show: false
        },
        itemStyle: {
          color: 'transparent'
        },
        data: yData
      },
      {
        type: 'custom',
        renderItem: (params, api) => {
          const location = api.coord([api.value(0), api.value(1)])
          location[0] = location[0] + wid * 0
          const xlocation = api.coord([api.value(0), 0])
          xlocation[0] = xlocation[0] + wid * 0
          return {
            type: 'group',
            children: [
              {
                type: 'CubeLeft',
                shape: {
                  api,
                  xValue: api.value(0),
                  yValue: api.value(1),
                  x: location[0],
                  y: location[1],
                  xAxisPoint: xlocation
                },
                style: {
                  fill: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                    {
                      offset: 0,
                      color: '#059de6'
                    },
                    {
                      offset: 1,
                      color: '#059de6'
                    }
                  ])
                },
                emphasis: {
                  style: {
                    fill: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                      {
                        offset: 0,
                        color: '#FFD700'
                      },
                      {
                        offset: 1,
                        color: '#FFA500'
                      }
                    ])
                  }
                }
              },
              {
                type: 'CubeRight',
                shape: {
                  api,
                  xValue: api.value(0),
                  yValue: api.value(1),
                  x: location[0],
                  y: location[1],
                  xAxisPoint: xlocation
                },
                style: {
                  fill: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                    {
                      offset: 0,
                      color: '#254193'
                    },
                    {
                      offset: 1,
                      color: '#254193'
                    }
                  ])
                },
                emphasis: {
                  style: {
                    fill: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                      {
                        offset: 0,
                        color: '#FFD700'
                      },
                      {
                        offset: 1,
                        color: '#FFA500'
                      }
                    ])
                  }
                }
              },
              {
                type: 'CubeTop',
                shape: {
                  api,
                  xValue: api.value(0),
                  yValue: api.value(1),
                  x: location[0],
                  y: location[1],
                  xAxisPoint: xlocation
                },
                style: {
                  fill: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                    {
                      offset: 0,
                      color: '#17e0fe'
                    },
                    {
                      offset: 1,
                      color: '#17e0fe'
                    }
                  ])
                },
                emphasis: {
                  style: {
                    fill: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                      {
                        offset: 0,
                        color: '#FFD700'
                      },
                      {
                        offset: 1,
                        color: '#FFA500'
                      }
                    ])
                  }
                }
              }
            ]
          }
        },
        color: 'blue',
        data: yData
      }
    ]
  }

  flowChart.setOption(option)
}