title: how to show two location in map and automatically set zoom level and center of this point in ionic2?
body: <p>I want to show two location with marker in map and automatically set zoom level and center of this point in ionic 2
  this code shows both 2 different points and marker but if my <code>position</code> is outside of this markers position they will not be shown in <code>canvas</code></p>
  
  <pre><code>initializeMap() {
  let minZoomLevel = 12;
  Geolocation.getCurrentPosition().then((position) =&gt; {
  this.map = new google.maps.Map(document.getElementById('map_canvas'), {
  zoom: minZoomLevel,
  center: new google.maps.LatLng(position.coords.latitude, position.coords.longitude),
  mapTypeControl: false,
  streetViewControl: false,
  mapTypeId: google.maps.MapTypeId.ROADMAP
  });
  var trafficLayer = new google.maps.TrafficLayer();
          trafficLayer.setMap(this.map);
          this.OriginMarker(this.start_point);
          this.TargetMarker(this.end_point);
  });
  }
  OriginMarker(data){  
    var latlng : string = data.split(',');
    var LatLng = new google.maps.LatLng(+latlng[0],+latlng[1]);  
     let image = 'assets/img/Untitled-1.png';   
     let marker = new google.maps.Marker({    
      map: this.map,
      animation: google.maps.Animation.DROP,
      position: LatLng, icon: image
    }); 
  
  }
  
  TargetMarker(data) {
    var latlng : string = data.split(',');
    var LatLng = new google.maps.LatLng(+latlng[0],+latlng[1]);  
      let image = 'assets/img/Untitled-2.png';
      let marker = new google.maps.Marker({
       map: this.map,
      animation: google.maps.Animation.DROP,
      position: LatLng , icon: image
    }); 
  }
  </code></pre>