vue怎么使用echarts实现立体柱形图

今天小编给大家分享一下vue怎么使用echarts实现立体柱形图的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。

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