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我使用该代码在我的应用程序中进行地理定位，并且在我移动时它也能正常工作。我添加了几行来创建从地理位置到具有固定纬度的终点（固定）点的计算。我不明白为什么我的代码中的原点不被接受（fireBug 说我不能在其上调用属性 [object Object]）但我无法弄清楚。以下是有关 gmaps v3 的代码：

//image for the marker
var imageLoc = '../../img/bbb3.gif' 
var map;
//initialize the maps
function initialize() {
  //call directionsService and Display for the route
  var directionsService = new google.maps.DirectionsService();
  var directionsDisplay = new google.maps.DirectionsRenderer();
  //map option
  var mapOptions = {
    zoom: 8,
    center: new google.maps.LatLng(44.49489, 11.34262),
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
  map = new google.maps.Map(document.getElementById('map'),
      mapOptions);
  //create the marker for the geolocation
  marker = new google.maps.Marker({ 
          map: map,
          icon: imageLoc
  });
  //call updatePos() function
  updatePos();

  directionsDisplay.setMap(map);
  directionsDisplay.setPanel(document.getElementById('panel'));
      var request = {
        //origin is the marker of my geolocation
        origin: marker,
        //destination is a fxed position
        destination: new google.maps.LatLng(44.496099,11.340246),
        travelMode: google.maps.DirectionsTravelMode.WALKING
     };

     directionsService.route(request, function (response, status) {
       if (status == google.maps.DirectionsStatus.OK) {
          directionsDisplay.setDirections(response);
        }
      });
}
var i;
//here I set my marker (if i==0 -> first run)
function updatePos(){
var options = {
    timeout: 60000, enableHighAccuracy: true
};
var myUpdatedPos = navigator.geolocation.watchPosition(onSuccess, onError, options);
function onSuccess(position) {
    if (i==0){
        marker = new google.maps.Marker({
                        position: new google.maps.LatLng(position.coords.latitude, position.coords.longitude),
                        map: map                       
                    });
    }
    i++;
    //here I update the position
     newLatlng = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);
    marker.setPosition(newLatlng);
}

// onError Callback receives a PositionError object
//
    function onError(error) {
        alert('code: '    + error.code    + '\n' +
        'message: ' + error.message + '\n');
    }
}
google.maps.event.addDomListener(window, 'load', initialize);

有谁知道为什么？

亲切的问候

布鲁斯

4

1 回答 1

2

directionRequest 采用字符串（“地址”）或 google.maps.LatLng 作为起点和终点。标记是 google.maps.Marker 对象。

var request = {
    //origin is the marker of my geolocation
    origin: marker,
    //destination is a fxed position
    destination: new google.maps.LatLng(44.496099,11.340246),
    travelMode: google.maps.DirectionsTravelMode.WALKING
 };

要获取标记的位置，请使用它的 getPosition 方法：

var request = {
    //origin is the marker of my geolocation
    origin: marker.getPosition(),
    //destination is a fxed position
    destination: new google.maps.LatLng(44.496099,11.340246),
    travelMode: google.maps.DirectionsTravelMode.WALKING
 };

要在初始化标记时给它一个位置，您可以这样做：

 //create the marker for the geolocation
 marker = new google.maps.Marker({ 
      map: map,
      position: map.getCenter(),
      icon: imageLoc
 });
于 2013-09-25T14:46:43.547 回答