google map使用自定义Marker在地图上添加文字标示

google map默认的标示GMarker,只能使用图片不能使用文字。但是在实际中,我们不可避免的需要在地图上标示文字信息。例如地名等。Google 地图 API 使我们可以通过扩展GMarker实现自定义的GMarker的子类LabelMarker。

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--> 1 google.maps.LabelMarker = function(latlng, options)
 {
     this.latlng = latlng;
     this.labelText = options.labelText || '';
     this.labelClass = options.labelClass || 'writeb';
     this.labelOffset = options.labelOffset || new google.maps.Size(8, -33);
     options.icon = options.icon || getTextIcon();
     google.maps.Marker.apply(this, arguments);
 }
 
 google.maps.LabelMarker.prototype = new google.maps.Marker(new google.maps.LatLng(0, 0));
 
 google.maps.LabelMarker.prototype.initialize = function(map){
     google.maps.Marker.prototype.initialize.call(this, map);
     
     var label = document.createElement('div');
     label.className = this.labelClass;
     label.innerHTML = this.labelText;
     label.style.position = 'absolute';
     label.style.width = '48px';
     map.getPane(G_MAP_MARKER_PANE).appendChild(label);
     
     this.map = map;
     this.label = label;
 }
 
 google.maps.LabelMarker.prototype.redraw = function(force){
     google.maps.Marker.prototype.redraw.call(this, map);
     
     if(!force)
     {
         return;
     }
     
     var point = this.map.fromLatLngToDivPixel(this.latlng);
     var z = google.maps.Overlay.getZIndex(this.latlng.lat());
     
     this.label.style.left = (point.x + this.labelOffset.width) + 'px';
     this.label.style.top = (point.y + this.labelOffset.height) + 'px';
     this.label.style.zIndex = z + 1;
 }
 
 google.maps.LabelMarker.prototype.remove = function(){
     this.label.parentNode.removeChild(this.label);
     this.label = null;
     google.maps.Marker.prototype.remove.call(this);
 }
 
 function getTextIcon()
 {
     var icon = new google.maps.Icon();
     icon.image = "/js/map/img/mapts.gif";
     icon.iconSize = new GSize(48, 40);
     icon.iconAnchor = new GPoint(0, 40);
     icon.infoWindowAnchor = new GPoint(5, 1);
     return icon;
 }

  在页面上调用的代码:

1 var marker = new google.maps.LabelMarker(map.getCenter(), { 2 labelText:'我在这' 3 }); 4 5 map.addOverlay(marker);

  

现在就会在地图上显示我们自定义的GMarker标识了。

继承GOverlay的实现自定义GMarker的方法: google map自定义GMarker的方法二

 

posted @ 2012-08-03 17:03  GreyWolf  阅读(1287)  评论(0编辑  收藏  举报