我找到了几个关于在拖动标记时如何平移地图的V2示例。例如:http://www.putyourlightson.net/projects/coordinates
// create map and add controls
var map = new GMap2(document.getElementById("map"));
map.addControl(new GLargeMapControl());
map.addControl(new GMapTypeControl());
// set centre point of map
var centrePoint = new GLatLng('53.34870686020199', '-6.267356872558594');
map.setCenter(centrePoint, 14);
// add a draggable marker
var marker = new GMarker(centrePoint, {draggable: true});
map.addOverlay(marker);
// add a drag listener to the map
GEvent.addListener(marker, "dragend", function() {
var point = marker.getPoint();
map.panTo(point);
document.getElementById("latitude").value = point.lat();
document.getElementById("longitude").value = point.lng();
});
这个页面似乎在拖动标记时会自动平移,注意它唯一的事件监听器是 "dragend"。但我向您保证,在拖动标记时地图确实会平移。
我尝试使用V3 API实现相同的功能,但没有成功。甚至在拖动图标时调用map.panTo(),结果令人不满意:http://www.publicgloucester.com/test.html。
function initialize ()
{
Gloucester = new google.maps.LatLng (42.6159285, -70.6619888);
myOptions =
{
zoom: 14,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: Gloucester,
streetViewControl: false
}
map = new google.maps.Map (document.getElementById ("map_canvas"), myOptions);
marker = new google.maps.Marker ({position: Gloucester, title: "Gloucester, MA"});
marker.setMap (map);
marker.setDraggable (true);
google.maps.event.addListener (marker, 'drag', function (event)
{
// Pan to this position (doesn't work!)
map.panTo (marker.getPosition());
});
}
我认为这样做不起作用是有道理的,因为在地图移动时将标记放置在地图中央是错误的。
V2 API 自动执行此操作,而 V3 API 不会。如何使用 V3 API 实现此效果?
谢谢。