<template>
 <div id="pieChart"></div>
</template>

"@antv/g2";
 
"",
  //数据部分
  data(){
    return{
     sourceData: [],//声明一个数组
     chart: {}, //全局定义chart对象
     id: Math.random().toString(36).substr(2), //动态生成ID,便于多次引用
    }
  },
  //初始加载 
  mounted() {
  this.initComponent();
 },
  methods: {
  //初始化获取数据
  initStrateGoal() {
   debugger;
   let _this = this;
   _this.$http
    .$get("后台接口地址")
    .then(function(response) {
     if (_this.$util.isBlank(response.data)) {
      return;
     }
     _this.sourceData = response.data;
     //调用绘图方法
     _this.getDrawing(_this.sourceData);
    })
    .catch(function(error) {
     _this.$message.error(_this, error);
    });
  },
  //绘制图形
  getDrawing(sourceData) {
   let _this = this;
   // Step 1: 创建 Chart 对象
   _this.chart = new G2.Chart({
    container: _this.id,
    forceFit: true,
    height: 255,
    padding: [30, 0, 35, 0],
    animate: false
    // margin: [0, 500]
   });
   let sumCount = 0;
   for (let i in sourceData) {
    sumCount = sumCount + Number(sourceData[i].count);
   }
   // Step 2: 载入数据源
   _this.chart.source(sourceData, {
    percent: {
     formatter: function formatter(val) {
      val = val + "%";
      return val;
     }
    }
   });
   _this.chart.coord("theta", {
    radius: 0.75,
    innerRadius: 0.6
   });
   //消息提示
   _this.chart.tooltip({
    showTitle: false,
    itemTpl:
     '<li><span style="background-color:{color};" class="g2-tooltip-marker"></span>{name}: {value}</li>'
   });
   // 辅助文本
   _this.chart.guide().html({
    position: ["50%", "50%"],
    html:
     '<div style="color:#8c8c8c;font-size: 10px;text-align: center;width: 6em;">目标总数<br><span style="color:#8c8c8c;font-size:14px">' +
     sumCount +
     "</span></div>",
    alignX: "middle",
    alignY: "middle"
   });
   // Step 3：创建图形语法，绘制饼图
   var interval = _this.chart
    .intervalStack()
    .position("percent")
    .color("item")
    .label("percent", {
     formatter: function formatter(val, item) {
      return item.point.item + ": " + val;
     }
    })
    .tooltip("item*percent", function(item, percent) {
     //数据显示为百分比形式
     percent = percent + "%";
     return {
      name: item,
      value: percent
     };
    })
    .style({
     lineWidth: 1,
     stroke: "#fff"
    });
   // Step 4：最后一步渲染至画布
   _this.chart.render();
   //初始加载图片后默认显示第一个条目突起，点击后进行变更
   interval.setSelected(sourceData[0]);
  },
  //因为父级页面用的事Tab调用，会有显示不全的现象发生，所以销毁所有对象后重新加载
  reloadDrawing() {
   //销毁画布对象
   this.chart.destroy();
   //重新调用数据进行加载
   this.initStrateGoal();
  }
 } 
}

<template>
<div id="roomTypeCheckIn"></div>
</template>

data() {
  return {
   mydata: [
    { roomTypeName: "单人间", checkInValue: 654, checkInPercent: 0.02 },
    { roomTypeName: "双人间", checkInValue: 654, checkInPercent: 0.02 },
    { roomTypeName: "钟点房", checkInValue: 4400, checkInPercent: 0.2 },
    { roomTypeName: "海景房", checkInValue: 5300, checkInPercent: 0.24 },
    { roomTypeName: "主题房", checkInValue: 6200, checkInPercent: 0.28 },
    { roomTypeName: "家庭房", checkInValue: 3300, checkInPercent: 0.14 },
    { roomTypeName: "总统房", checkInValue: 1500, checkInPercent: 0.06 }
   ]
  };
 },

methods: {
  initComponent() {
   const chart = new Chart({
    container: "roomTypeCheckIn",
    autoFit: true,
    height: 500,
    padding: [50, 20, 50, 20]
   });
   chart.data(this.mydata);
   chart.scale("checkInValue", {
    alias: "销售额"
   });

   chart.axis("roomTypeName", {
    tickLine: {
     alignTick: false
    }
   });
   chart.axis("checkInValue", false);

   chart.tooltip({
    showMarkers: false
   });
   chart
    .interval()
    .position("roomTypeName*checkInValue")
    .color("roomTypeName");
   chart.interaction("element-active");

   // 添加文本标注
   this.mydata.forEach(item => {
    chart
     .annotation()
     .text({
      position: [item.roomTypeName, item.checkInValue],
      content: item.checkInValue,
      style: {
       textAlign: "center"
      },
      offsetY: -30
     })
     .text({
      position: [item.roomTypeName, item.checkInValue],
      content: (item.checkInPercent * 100).toFixed(0) + "%",
      style: {
       textAlign: "center"
      },
      offsetY: -12
     });
   });
   chart.render();
  }
 }

 mounted() {
  this.initComponent();
 },

getData() {
   roomTypeApi.getRoomTypeStatistics().then(res => {
    this.mydata = res.data.data
   })
  },

 created() {
   this.getData()
 },

 watch: {
  mydata(b,a) {
    this.chart.changeData(b)
    this.chart.render()
  }
 },