vue+echarts项目四：地区销量趋势（堆叠折线图）_echarts趋势图

 最终效果如图

组件结构设计

外部 Trendpage.vue

<!--针对于/trendpage 这条路径显示 测试显示组件-->
<template>
  <div class="comP1">
    <Trend></Trend>
  </div>
</template>
 
<script>
  import Trend from "@/components/Trend";
  export default {
    name: "TrendPage",
    components:{Trend}
  }
</script>
 
<style scoped>
 
</style>

内部Trend.vue 

<!-- 显示地区销量趋势的折线图表 -->
<template>
<div class="comP2" ref="trend_1"></div>
</template>
<script>
export default {
data () {
return {}
},
methods: {}
}
</script>
<style lang="less" scoped>
</style>

 初始化图表+数据的获取+更新图表

设置好这些函数 在mounted生命周期内调用

    mounted() {
      // 渲染DOM元素之后 初始化图表实例 请求数据 监听页面尺寸变化
      this.initChart()
       this.getData()  // 请求数据
 
      // 监听图表尺寸发生变化时的 处理函数   自适应尺寸
      window.addEventListener('resize',this.screenAdapter)
      this.screenAdapter()
    },

找到盒子初始化图表、这里只是简单设置的直角坐标系 

      initChart(){
        this.chartInstance = this.$echarts.init(this.$refs.trend_1,this.theme)
        const initOption = {
          grid:{
            left:'3%',
            top:'35%',
            right:'4%',
            bottom:'1%',
            containLabel:true
          },
          tooltip:{ // 鼠标悬浮时的提示框
            trigger:'axis'
          },
          legend:{
            left: 20,
            top: '15%',
            icon:'circle'
          },
          xAxis: {
            type:'category',
            boundaryGap:false // 紧贴两侧边缘
          },
          yAxis:{
            type:'value'
          }
        }
        this.chartInstance.setOption(initOption)
      },

发送请求、获取数据 

      getData(){ 
        const {data:res} = await this.$http.get('trend')
        this.allData = res
        this.updateChart()
      },

请求过来的数据：

{
    "map": {
        "title": "地区销量趋势",
        "base": 310,
        "unit": "万",
        "data": [{
            "name": "上海",
            "data": ["155.13","154.65","171.46","164.38","237.23","300.65","240.29","232.07","193.31","136.70","48.64","90.20"]
        }, {
            "name": "北京",
            "data": ["86.25","33.80","145.58","21.79","176.09","132.41","291.05","191.89","151.54","94.25","141.75","157.14"]
        }, {
            "name": "深圳",
            "data": ["143.94","186.29","183.64","251.48","195.48","152.16","52.47","184.12","203.79","39.16","56.37","161.64"]
        }, {
            "name": "广州",
            "data": ["57.60","77.61","307.24","165.05","175.41","276.88","269.04","296.11","105.31","283.39","134.08","265.38"]
        }, {
            "name": "重庆",
            "data": ["200.82","215.56","249.80","222.67","216.98","60.12","309.68","273.35","150.99","251.97","26.15","186.99"]
        }]
    },
    "seller": {
        "title": "商家销量趋势",
        "base": 120,
        "unit": "万",
        "data": [{
            "name": "商家1",
            "data": ["33.00","86.07","28.77","34.29","102.45","0.30","50.50","21.70","25.41","25.71","66.90","63.29"]
        }, {
            "name": "商家2",
            "data": ["12.83","102.42","37.37","95.55","45.45","112.72","113.53","106.41","75.67","113.91", "37.32", "28.04"]
        }, {
            "name": "商家3",
            "data": ["73.54","40.92","89.81","113.41","76.34","107.15","55.61","0.33","106.29","78.30","98.05","38.67"]
        }, {
            "name": "商家4",
            "data": ["47.19","73.57","44.60","84.03","62.82","15.65","64.72","88.98","29.25","5.41","79.11","118.46"]
        }, {
            "name": "商家5",
            "data": ["74.84","116.45","107.69","11.03","17.31","42.22","97.60","108.64","43.87","110.65","5.96","38.41"]
        }]
    },
    "commodity": {
        "title": "商品销量趋势",
        "base": 50,
        "unit": "万",
        "data": [{
            "name": "女装",
            "data": ["47.71","13.34","19.30","7.93","41.93","23.01","22.63","26.91","0.62","39.23","48.74","29.48"]
        }, {
            "name": "手机数码",
            "data": ["46.66","46.52","23.65","1.73","44.26","47.07","17.86","40.20","3.78","31.46","28.01","8.63"]
        }, {
            "name": "男装",
            "data": ["26.98","30.71","42.59","29.50","26.86","17.65","30.15","15.85","9.28","30.20","32.35","34.46"]
        }, {
            "name": "大家电",
            "data": ["20.26","46.23","43.84","46.75","28.29","32.36","45.30","16.73","40.40","45.07","29.86","41.92"]
        }, {
            "name": "美妆护肤",
            "data": ["7.58","23.66","39.78","30.20","25.72","36.20","47.55","35.39","27.85","37.56","16.91", "3.91"]
        }]
    },
    "common": {
        "month": ["一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月"]
    },
    "type": [{
        "key": "map",
        "text": "地区销量趋势"
    }, {
        "key": "seller",
        "text": "商家销量趋势"
    }, {
        "key": "commodity",
        "text": "商品销量趋势"
    }]
}

数据请求过来后在进行 相应处理 渲染图表

data中预留的变量：

data(){
  return{
    chartInstance:null,// 预留初始化实例对象
    allData:null, // 服务器请求过来的数据
    showChoice:false, // 是否显示可选项
    choiceType:'map', // 显示的数据类型
    titleFontSize:0 // 指明标题的字体
  }
},

1.准备好两个数组 颜色透明度 0.5  ->  0.1

2.抽取时间轴的数据

3.抽取组合 series 系列的数组 

4.抽取 legend 分类提示

5.重新生成 option 调用 setOption 渲染图表

      updateChart(){
        // 数据更新时 重新渲染
        // 预设半透明颜色的值
        const colorArr1 = [
          'rgba(11,168,44,0.5)',
          'rgba(44,110,255,0.5)',
          'rgba(22,242,217,0.5)',
          'rgba(254,33,30,0.5)',
          'rgba(250,105,0,0.5)'
        ]
        // 预设全透明颜色的值
        const colorArr2 = [
          'rgba(11,168,44,0.1)',
          'rgba(44,110,255,0.1)',
          'rgba(22,242,217,0.1)',
          'rgba(254,33,30,0.1)',
          'rgba(250,105,0,0.1)'
        ]
        // 处理请求过来的 this.allData 数据 直接用变量 导进设置中
        const timeArr = this.allData.common.month // 类目轴的月份
        const valueArr = this.allData[this.choiceType].data // 数值轴的数据
        const seriesArr = valueArr.map((item,index) => {
          return {
            type:'line', // 类型是折线图
            data:item.data, // 数据是每一项的data
            stack:this.choiceType, // 设置成堆叠图一样的字符串就可以
            name:item.name, // 每一项的提示 name
            // 每一项面积颜色的设置 运用到 上面定义的两个数组
            areaStyle:{
              color:new this.$echarts.graphic.LinearGradient(0,0,0,1,[
                {
                  offset:0,
                  color:colorArr1[index]
                },
                {
                  offset:1,
                  color:colorArr2[index]
                }
              ])
            }
          }
        })
        const legendArr = valueArr.map(item => {
          return item.name
        })
 
 
        const dataOption = {
          xAxis: {
            data:timeArr
          },
          legend:{
            data:legendArr
          },
          series:seriesArr
        }
        this.chartInstance.setOption(dataOption)
      },

尺寸变化的适配-第三篇文章已经详细讲过

      screenAdapter(){
        // 页面分辨率发生改变时 重新渲染
        this.titleFontSize = this.$refs.trend_1.offsetWidth / 100 * 3.6
        const adapterOption = {
          // legend 是提示类目的文字 可以总的设置 也可以在单独的 series 里设置
          legend: {
            itemWidth: this.titleFontSize,
            itemHeight: this.titleFontSize,
            itemGap: this.titleFontSize,
            textStyle: {
              fontSize: this.titleFontSize / 2
            }
          }
        }
        this.chartInstance.setOption(adapterOption)
        this.chartInstance.resize()
      },

标题显示以及对于数据的切换操作

 

请求过来的数据当中 有 三种类型  map  seller  commodity 默认是 map

在template 当中添加 标题选择模块  附加一定的样式 使得标题显示在对应的位置

1. 整体的 位置 由title 样式决定  动态样式 comStyle 会随着窗口变化和主题切换而改动
2. showTitle  根据 this.choiceType 动态决定标题
3. icon-font 字体图标 小箭头 点击切换 下拉标题的选择
4. v-for 渲染下拉标题 过滤掉当前选择的标题
5. 为每一小项 添加点击事件 传入 对应的key  更新this.choiceType 后重新渲染图标 并隐藏下拉

<template>
  <div class="comP3">
    <div class="title" :style="comStyle">
      <span>{{'▎ ' + showTitle}}</span>
      <span class="iconfont title-icon" :style="comStyle" @click="showChoice = !showChoice">&#xe6eb;</span>
      <div class="select-con"
           :style="theme === 'chalk' ? 'background-color: #222733;' : 'background-color: #ffffff;'"
           v-show="showChoice">
        <div class="select-item" :style="marginStyle" v-for="item in selectTypes" :key="item.key" @click="handleSelect(item.key)">
          {{item.text}}
        </div>
      </div>
    </div>
    <div class="comP2" ref="trend_1"></div>
  </div>
 
</template>
 
<style scoped lang="less">
  .title {
    position: absolute;
    left: 20px;
    top: 20px;
    z-index: 10;
    cursor: pointer;
    user-select: none;
    color: white;
  .title-icon {
    margin-left: 10px;
  }
  .select-con {
    /*background-color: #222733;*/
  }
  }
</style>

与之对应的计算属性和方法：

    computed:{
      ...mapState(['theme']),
      // 准备遍历选项的 元数据
      selectTypes(){
        if (!this.allData){
          return []
        }else {
          return this.allData.type.filter(item =>{
            return item.key !== this.choiceType
          })
        }
      },
      // 显示当前选中的标题
      showTitle(){
        if(!this.allData){
          return ''
        }else {
          return this.allData[this.choiceType].title
        }
      },
      // 设置给标题的样式
      comStyle(){
        return `font-size:${this.titleFontSize}px;color:${getThemeValue(this.theme).titleColor}`
      },
      marginStyle(){
        return `padding-left:${this.titleFontSize}px`
      },
    },
methods:{
      handleSelect(currentType){
        this.choiceType = currentType
        this.updateChart()
        this.showChoice = false
      }
}