layer添加元素 openlayer_OpenLayers使用点要素作为标记

使用点要素作为标记

functioninit(){varmap= newOpenLayers.Map("ch3_feature_markers");varlayer= newOpenLayers.Layer.OSM("OpenStreetMap");

map.addLayer(layer);

map.addControl(newOpenLayers.Control.LayerSwitcher());

map.setCenter(newOpenLayers.LonLat(0,0),2);varpointLayer= newOpenLayers.Layer.Vector("Features", {

projection:"EPSG:933913"});

map.addLayer(pointLayer);//新建一些随机的要素点

varpointFeatures=[];for(vari=0; i< 150; i++) {varpx=Math.random()* 360 - 180;varpy=Math.random()* 170 - 85;//将经纬度坐标转换为地图工程.

varlonlat= newOpenLayers.LonLat(px, py);

lonlat.transform(newOpenLayers.Projection("EPSG:4326"),newOpenLayers.Projection("EPSG:900913"));varpointGeometry= newOpenLayers.Geometry.Point(lonlat.lon, lonlat.lat);varpointFeature= newOpenLayers.Feature.Vector(pointGeometry);

pointFeatures.push(pointFeature);

}//将要素添加到图层中

pointLayer.addFeatures(pointFeatures);//当要素选中之后的事件控制

pointLayer.events.register("featureselected",null,function(event){varlayer=event.feature.layer;

event.feature.style={

fillColor:'#ff9900',

fillOpacity:0.7,

strokeColor:'#aaa',

pointRadius:12};

layer.drawFeature(event.feature);

});//当要素未选中之后的事件控制

pointLayer.events.register("featureunselected",null,function(event){varlayer=event.feature.layer;

event.feature.style= null;

event.feature.renderIntent= null;

layer.drawFeature(event.feature);

});//添加到触发矢量图层上的事件需要选择功能控制。

varselectControl= newOpenLayers.Control.SelectFeature(pointLayer);

map.addControl(selectControl);

selectControl.activate();

}