/*初始化地圖*/
  var map;
  function initmap(){   
   map= new ol.Map({
   layers: layers,
   target: 'mapContainer',
   view: new ol.View({
    //地圖中心坐標
    center: new ol.proj.fromLonLat([117.191166, 34.289749],'EPSG:3857'),
    zoom: 13//地圖縮放級別
   })
   });
   //添加標注
   addFeature();      
  }



  /*添加標注信息*/
  function addFeature(){ 
  //數(shù)據(jù)太多，放json里讀取，里面是標注的坐標信息  
  $.get('./featureData.json').done(function(data){ 
   var data = eval(data);
   var lon = 0;
   var lat = 0;
   var romeArr = [];
   for(var i=0;i<data .length;i++){
    lon = parseFloat(data [i].lon);
    lat = parseFloat(data [i].lat);
    name = data[i].name;    
    var rome = new ol.Feature({
     geometry:new ol.geom.Point(new ol.proj.fromLonLat([lon,lat],'EPSG:3857')),
     name:name
    });
    //標注樣式設置
    rome.setStyle(new ol.style.Style({
     image: new ol.style.Icon(({
     crossOrigin: 'anonymous',
     scale:0.3, //標注圖標大小     
     src: 'images/vtourskin_mapspot.png'
     }))
    }));
    romeArr.push(rome);  
   }
   //定義select控制器，點擊標注后的事件
   var select= new ol.interaction.Select();
    //map加載該控件，默認是激活可用的
    map.addInteraction(select);
    select.on('select', function(e) {
    /*恢復其他圖標樣式*/
    romeArr.forEach(function(ele){
     ele.setStyle(new ol.style.Style({
     image: new ol.style.Icon(({
      crossOrigin: 'anonymous',
      scale:0.3,     
      src: 'images/vtourskin_mapspot.png'
     }))
     }));
    })
    console.log(e.selected); //打印已選擇的Feature            
    /*當前選擇的圖標變化，在此僅改變了圖片路徑以顯示不同的圖標，可以根據(jù)自己的需要進行設置*/
    var currentRome = e.selected[0];
    currentRome.setStyle(new ol.style.Style({
     image: new ol.style.Icon(({
      crossOrigin: 'anonymous',
      scale:0.3,     
      src: 'images/vtourskin_mapspotactive.png'
     }))
     }));
    });

   vectorSource = new ol.source.Vector({
    features: romeArr
   });

   var vectorLayer = new ol.layer.Vector({
    source: vectorSource
   });

   map.addLayer(vectorLayer);

  });
}