mounted() {
 let that = this
 //--0--//地圖對象的初始化
 this.map = new maptalks.Map('map', {
  center: [109.1748453547,21.4586700546],
  //中心點標記紅十字，用于開發debug
  centerCross : false,
  zoom: 13,
  minZoom : 10,
  maxZoom : 18,
  //縮放級別控件
  zoomControl : false, // add zoom control
  scaleControl : true, // add scale control
  //鷹眼控件
  overviewControl : true, // add overview control
  //設置瓦片圖層的空間參考spatialReference默認就是3857，googlemap的分辨率
  spatialReference : {
   projection : 'EPSG:3857'
   //與map一樣，支持更詳細的設置resolutions，fullExtent等
  },
  baseLayer: new maptalks.TileLayer('base', {
   // urlTemplate: 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
   //renderer : 'canvas', // set TileLayer's renderer to canvas
   //底圖服務器地址，如下為瓦片地址
   urlTemplate: 'http://xxx.xx.xxx.xxx:xxxx/mapdata/tiles/{z}/{x}/{y}.png',
   //tileSystem 控制瓦片的x,y以及行列，后兩個是origin原點位置（很重要）
   tileSystem : [1, 1, -20037508.3427890,-20037508.3427890], // tile system
   //subdomains: ['a','b','c'],
   minZoom : 10,
   maxZoom : 18
   // css filter 濾鏡配置
   // cssFilter : 'sepia(60%) invert(95%)',
   // attribution: '&copy; <a href="http://maptalks.org/" rel="external nofollow" target="_blank">Maptalk for Amap</a> contributors'
  }),
  layers : [
   new maptalks.VectorLayer('v')
  ],
  attribution: {//左下角info
   content: '&copy;qmap'
  }
 })
 
 // 拖動范圍限制，黑框控
 let extent = new maptalks.Extent(108.8584570000,20.9790840000,110.0569128018,22.1177123207)
 // var extent = new maptalks.Extent(112.5381688894,26.8876543885,112.5605009244,26.9012691519);
 // set map's max extent to map's extent at zoom 14
 this.map.setMaxExtent(extent)
 this.map.setZoom(this.map.getZoom(), { animation : false })
 this.map.getLayer('v')
  .addGeometry(
   new maptalks.Polygon(extent.toArray(), {
    symbol : { 'polygonOpacity': 0, 'lineWidth': 0 }
   })
  )
 
// 往地圖上添加點位
 
this.markInfo()
},
 
methods: {
 setCenter: function(center) {
  //標注點平移到某個點
  let centerV = maptalks1.CRSTransform.transform(center, 'bd09ll', 'gcj02')
  this.map.animateTo({
   zoom: 17,
   center: centerV
  }, {
   duration: 1000
  })
 },
 // 上圖
 markInfo: function () {
  let that = this
  that.map.removeLayer(that.clusterLayer)
  let markers = []
  //--2--//前端聚合查詢
  // data from realworld.50000.1.js
  //需要引入maptalks.markercluster.js
  //數據格式[lon,lat,name]
  // 如：[[21.8129763667, 109.2714296333, "曉港名城4號樓"],[21.8131727667, 109.2710308833, "曉港名城6號樓"]]
  for (let i = 0; i < that.addressPoints.length; i++) {
   let a = that.addressPoints[i]
   markers.push(new maptalks.Marker(maptalks1.CRSTransform.transform([a.latitude, a.longitude], 'bd09ll', 'gcj02'),
    {
     'properties': {
      'name': a.name,
      'onSale': a.onSale
     },
     symbol : [
      {
       'markerFile'  : a.onSale &#63; require('../../../static/img/on.png') : require('../../../static/img/off.png'),//標注點圖標
       'markerWidth' : 30,
       'markerHeight' : 35
      },{
       'textName' : '{name}',
       'textSize' : 12,
       'textDy'  : -50,
       'textHaloRadius' : 5,
       'textHaloFill' : a.onSale &#63; '#FFB427' : '#B9B9B9',
       'textFill' : '#fff' // color
      }
     ]
    }
   ))//.on('mousedown', onClick))
  }
  let clusterLayer = new ClusterLayer('cluster', markers, {
   'noClusterWithOneMarker' : true,
   'noClusterWithHowMany': 8,//聚合的最小個數
   'maxClusterZoom' : 15,
   //"count" is an internal variable: marker count in the cluster.
   'symbol': {
    'markerType' : 'ellipse',
    'markerFill' : { property:'count', type:'interval', stops: [[0, 'rgb(135, 196, 240)'], [9, '#1bbc9b'],[50, 'rgb(116, 115, 149)'],
      [99, 'rgb(216, 115, 149)']]},
    'markerFillOpacity' : 0.7,
    'markerLineOpacity' : 1,
    'markerLineWidth' : 3,
    'markerLineColor' : '#fff',
    'markerWidth' : { property:'count', type:'interval', stops: [[0, 40], [9, 60], [50, 70],[99, 80]] },
    'markerHeight' : { property:'count', type:'interval', stops: [[0, 40], [9, 60], [50, 70],[99, 80]] }
   },
   'drawClusterText': true,
   'geometryEvents' : true,
   'single': true
  })
  that.map.addLayer(clusterLayer)
  that.clusterLayer = clusterLayer
 
  function onClick(e) {
   e.target.setInfoWindow({
    'content': '<div class="content-' + e.target.properties.onSale + '">' + e.target.properties.name + '</div>',
    'width' : 150,
    'dy' : 5,
    'autoPan': true,
    'custom': false,
    'autoOpenOn' : 'click', //set to null if not to open when clicking on marker
    'autoCloseOn' : 'click'
   })
  }
 }
} 
 
 

  //實例化地圖對象
  let map = new maptalks.Map("map",{
   center: [13.416935229170008, 52.529564137540376],
   zoom: 20,
   dragPitch : true,
   //allow map to drag rotating, true by default
   dragRotate : true,
   //enable map to drag pitching and rotating at the same time, false by default
   dragRotatePitch : true,
   baseLayer: new maptalks.TileLayer('base', {
    urlTemplate: 'https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
    subdomains: ['a','b','c','d'],
    attribution: '&copy; <a href="http://osm.org" rel="external nofollow" >OpenStreetMap</a> contributors, &copy; <a href="https://carto.com/" rel="external nofollow" >CARTO</a>'
   })
  });

// features to draw
//將Buildings中的數據，添加到features中
  let features = [];

  buildings.forEach(function (b) {
   console.log(b.features);
   features = features.concat(b.features);
  });

// the ThreeLayer to draw buildings
  let threeLayer = new ThreeLayer('t', {
   forceRenderOnMoving : true,
   forceRenderOnRotating : true
  });


  threeLayer.prepareToDraw = function (gl, scene, camera) {

   let me = this;
   let light = new THREE.DirectionalLight(0xffffff);
   light.position.set(0, -10, 10).normalize();
   scene.add(light);

   features.forEach(function (g) {
    let heightPerLevel = 5;
    let levels = g.properties.levels || 1;
    let color = 0x2685a7

    let m = new THREE.MeshPhongMaterial({color: color, opacity : 0.7});
    //change to back side with THREE <= v0.94
    // m.side = THREE.BackSide;

    let mesh = me.toExtrudeMesh(maptalks.GeoJSON.toGeometry(g), heightPerLevel, m, heightPerLevel);
    if (Array.isArray(mesh)) {
     scene.add.apply(scene, mesh);
    } else {
     scene.add(mesh);
    }
   });
  };

  threeLayer.addTo(map);