vue基于echarts实现立体柱形图

立体柱形图是由前面、右面、上面三部分组成，绘制时需要先绘制前面为一个图形，右面和上面绘制为一个图形，然后在echats中注册，在option的series中renderItem中渲染

代码如下：

（1）注册绘制图形

registry () {
      let MyCubeRect = this.$echarts.graphic.extendShape({
        shape: {
          x: 0,
          y: 0,
          width: 20,
          zWidth: 8,
          zHeight: 4
        },
        buildPath: function (ctx, shape) {
          const api = shape.api
          const xAxisPoint = api.coord([shape.xValue, 0])
          const p0 = [shape.x, shape.y]
          const p1 = [shape.x - shape.width / 2, shape.y]
          const p4 = [shape.x + shape.width / 2, shape.y]
          const p2 = [shape.x - shape.width / 2, xAxisPoint[1]]
          const p3 = [shape.x + shape.width / 2, xAxisPoint[1]]

          ctx.moveTo(p0[0], p0[1])
          ctx.lineTo(p1[0], p1[1])
          ctx.lineTo(p2[0], p2[1])
          ctx.lineTo(p3[0], p3[1])
          ctx.lineTo(p4[0], p4[1])
          ctx.lineTo(p0[0], p0[1])
          ctx.closePath()
        }
      })
      let MyCubeShadow = this.$echarts.graphic.extendShape({
        shape: {
          x: 0,
          y: 0,
          width: 20,
          zWidth: 8,
          zHeight: 4
        },
        buildPath: function (ctx, shape) {
          const api = shape.api
          const xAxisPoint = api.coord([shape.xValue, 0])
          const p1 = [shape.x - shape.width / 2, shape.y]
          const p4 = [shape.x + shape.width / 2, shape.y]
          const p6 = [shape.x + shape.width / 2 + shape.zWidth, shape.y - shape.zHeight]
          const p7 = [shape.x - shape.width / 2 + shape.zWidth, shape.y - shape.zHeight]
          const p3 = [shape.x + shape.width / 2, xAxisPoint[1]]
          const p5 = [shape.x + shape.width / 2 + shape.zWidth, xAxisPoint[1] - shape.zHeight]

          ctx.moveTo(p4[0], p4[1])
          ctx.lineTo(p3[0], p3[1])
          ctx.lineTo(p5[0], p5[1])
          ctx.lineTo(p6[0], p6[1])
          ctx.lineTo(p4[0], p4[1])

          ctx.moveTo(p4[0], p4[1])
          ctx.lineTo(p6[0], p6[1])
          ctx.lineTo(p7[0], p7[1])
          ctx.lineTo(p1[0], p1[1])
          ctx.lineTo(p4[0], p4[1])
          ctx.closePath()
        }
      })
      this.$echarts.graphic.registerShape('MyCubeRect', MyCubeRect)
      this.$echarts.graphic.registerShape('MyCubeShadow', MyCubeShadow)
    }

（2）渲染图形

barChartOption: {
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#6a7985'
            }
          }
        },
        grid: {
          containLabel: true,
          top: '30px',
          bottom: '0px',
          left: '0px'
        },
        xAxis: {
          type: 'category',
          axisLabel: {
            interval: 0,
            fontSize: fontSize(12)
          },
          axisLine: {
            show: false,
            lineStyle: {
              color: '#98b9c5'
            }
          },
          data: []  //通过后端传入数据js传入
        },
        yAxis: {
          type: 'value',
          axisLabel: {
            fontSize: fontSize(12)
          },
          axisLine: {
            show: false,
            lineStyle: {
              color: '#98b9c5'
            }
          },
          splitLine: {
            lineStyle: {
              color: '#3a586a',
              type: 'dashed'
            }
          }
        },
        series: [{
          name: '单位面积能耗',
          type: 'custom',
          renderItem: (params, api) => {
            let location = api.coord([api.value(0), api.value(1)])
            return {
              type: 'group',
              children: [{
                type: 'MyCubeRect',
                shape: {
                  api,
                  xValue: api.value(0) - 0.5,
                  yValue: api.value(1),
                  x: location[0],
                  y: location[1]
                },
                style: api.style()
              },
              {
                type: 'MyCubeShadow',
                shape: {
                  api,
                  xValue: api.value(0) - 0.5,
                  yValue: api.value(1),
                  x: location[0],
                  y: location[1]
                },
                style: {
                  fill: api.style(),
                  text: ''
                }
              }]
            }
          },
          stack: '单位面积能耗',
          label: {
            show: true,
            position: 'top',
            formatter: '{c}',
            textStyle: {
              fontSize: fontSize(12),
              color: '#fff',
              align: 'center'
            }
          },
          itemStyle: {
            color: new this.$echarts.graphic.LinearGradient(
              0, 0, 0, 1,
              [
                { offset: 0, color: '#b1950d' },
                { offset: 0.5, color: '#aea20d' },
                { offset: 1, color: '#a5aa12' }
              ]
            )
          },
          data: [] //后端传入数据
        }]
      }

注意事项：

1）、在注册图形时style：只能使用 style: api.style();
text: ''后面才能使用label在图形顶部放置value
2）、this.$echarts是经过统一封装之后的，具体情况还需具体考虑
3）、生成图形

generateBarChart () {
      let vm = this
      if (this.$refs['uintEnergyConsume']) { //this.$refs是生成图形区域的ref值
        this.$echarts.graphic.registerShape('MyCubeRect', this.MyCubeRect)
        this.$echarts.graphic.registerShape('MyCubeShadow', this.MyCubeShadow)
        this.barChart = this.$echarts.init(this.$refs['uintEnergyConsume'])
        this.barChart.setOption(this.barChartOption, false, true)
        $(window).resize(function () { //屏幕自适应
          vm.handleResize()
        })
      }
    }

（4）template中代码

<div  ref="uintEnergyConsume"  id="uintEnergyConsume"  class="chart-container"
 style="width: 100%;"  element-loading-text="加载中..."></div>
</div>

（5）效果如下：

参考图形网址：Vue使用Echarts实现立体柱状图

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