单独图表组件的开发 --- 库存与销量模块（圆环饼图 ）

Posted 2021-10-26 So istes immer

目录

通用代码结构和流程

组件的结构：StockPage.vue、Stock.vue
代码流程结构：初始化图表对象initChart、获取数据getData、处理数据更新图表updateChart、分辨率适配screenAdapter

图表基本功能的实现

数据的获取：/api/stock
数据的处理：五个饼图（series数组下有5个对象）、每个饼图两个区域（series下的每个对象的data属性拥有两个对象）
图表的位置：type为pie、每个饼图的位置不同（center）、圆环需要设置两个半径（radius）

UI调整

主题的使用：init的第二个参数
标题的设置：title
鼠标动画的移除：hoverAnimation
指示线移除：labelLine
圆环内文字的显示：label(position:center、color)
颜色设置：销量（颜色渐变LinearGradient）、库存(固定的颜色值)

切换动画

数据的处理：currentIndex 标识当前的页数，每一页显示5个圆环
启动和停止的时机：启动（获取数据之后、鼠标移出图表）、停止（组件销毁时、鼠标移入图表）
边界值的处理：判断currentIndex是否大于1

分辨率适配

标题的文字大小、圆环半径、圆环文字

components/Stock.vue

<!-- 库存销量分析 -->
<template>
  <div class="com-container">
    <div class="com-chart" ref="stock_ref"></div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      chartInstance: null,
      allData: null,
      currentIndex: 0, // 当前显示的数据
      timerId: null // 定时器的标识
    }
  },
  mounted () {
    this.initChart()
    this.getData()
    window.addEventListener('resize', this.screenAdapter)
    this.screenAdapter()
  },
  destroyed () {
    window.removeEventListener('resize', this.screenAdapter)
    clearInterval(this.timerId)
  },
  methods: {
    initChart () {
      this.chartInstance = this.$echarts.init(this.$refs.stock_ref, 'chalk')
      const initOption = {
        title: {
          text: '▎ 库存和销量分析',
          left: 20,
          top: 20
        }
      }
      this.chartInstance.setOption(initOption)
      this.chartInstance.on('mouseover', () => {
        clearInterval(this.timerId)
      })
      this.chartInstance.on('mouseout', () => {
        this.startInterval()
      })
    },
    async getData () {
      // 获取服务器的数据，对this.allData进行赋值之后，调用updateChart方法更新图表
      const { data: ret } = await this.$http.get('stock')
      this.allData = ret
      this.updateChart()
      this.startInterval()
    },
    updateChart () {
      const centerArr = [
        ['18%', '40%'],
        ['50%', '40%'],
        ['82%', '40%'],
        ['34%', '75%'],
        ['66%', '75%']
      ]
      const colorArr = [
        ['#4FF778', '#0BA82C'],
        ['#E5DD45', '#E8B11C'],
        ['#E8821C', '#E55445'],
        ['#5052EE', '#AB6EE5'],
        ['#23E5E5', '#2E72BF']
      ]
      // 处理图表需要的数据
      const start = this.currentIndex * 5
      const end = (this.currentIndex + 1) * 5
      const showData = this.allData.slice(start, end)
      const seriesArr = showData.map((item, index) => {
        return {
          type: 'pie',
          radius: [110, 100],
          center: centerArr[index],
          hoverAnimation: false, // 关闭鼠标移入到饼图时的动画效果
          labelLine: {
            show: false // 隐藏指示线
          },
          label: {
            position: 'center',
            color: colorArr[index][0]
          },
          data: [
            {
              name: item.name + '\\n' + item.sales,
              value: item.sales,
              itemStyle: {
                color: new this.$echarts.graphic.LinearGradient(0, 1, 0, 0, [
                  {
                    offset: 0,
                    color: colorArr[index][0]
                  },
                  {
                    offset: 1,
                    color: colorArr[index][1]
                  }
                ])
              }
            },
            {
              value: item.stock,
              itemStyle: {
                color: '#333843'
              }
            }
          ]
        }
      })
      const dataOption = {
        series: seriesArr
      }
      this.chartInstance.setOption(dataOption)
    },
    screenAdapter () {
      const titleFontSize = this.$refs.stock_ref.offsetWidth / 100 * 3.6
      const innerRadius = titleFontSize * 2
      const outterRadius = innerRadius * 1.125
      const adapterOption = {
        title: {
          textStyle: {
            fontSize: titleFontSize
          }
        },
        series: [
          {
            type: 'pie',
            radius: [outterRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
          {
            type: 'pie',
            radius: [outterRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
          {
            type: 'pie',
            radius: [outterRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
          {
            type: 'pie',
            radius: [outterRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
          {
            type: 'pie',
            radius: [outterRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          }
        ]
      }
      this.chartInstance.setOption(adapterOption)
      this.chartInstance.resize()
    },
    startInterval () {
      if (this.timerId) {
        clearInterval(this.timerId)
      }
      this.timerId = setInterval(() => {
        this.currentIndex++
        if (this.currentIndex > 1) {
          this.currentIndex = 0
        }
        this.updateChart()
      }, 5000)
    }
  }
}
</script>

<style>
</style>

views/StockPage.vue

<!--
针对/stockpage这条路径而显示出来
在这个组件中，通过注册子组件的方式显示Stock.vue这个组件
-->
<template>
  <div class="com-page">
    <stock></stock>
  </div>
</template>

<script>
import Stock from '../components/Stock.vue'
export default {
  components: {
    stock: Stock
  }
}
</script>

<style>
</style>

router/index.js

import Vue from 'vue'
import VueRouter from 'vue-router'
import SellerPage from '../views/SellerPage'
import TrendPage from '../views/TrendPage'
import MapPage from '../views/MapPage'
import RankPage from '../views/RankPage'
import HotPage from '../views/HotPage'
import StockPage from '../views/StockPage'

Vue.use(VueRouter)

const routes = [
  {
    path: '/sellerpage',
    component: SellerPage
  },
  {
    path: '/trendpage',
    component: TrendPage
  },
  {
    path: '/mappage',
    component: MapPage
  },
  {
    path: '/rankpage',
    component: RankPage
  },
  {
    path: '/hotpage',
    component: HotPage
  },
  {
    path: '/stockpage',
    component: StockPage
  }
]

const router = new VueRouter({
  routes
})

export default router