1
我有一个OpenLayers map,它在矢量图层中绘制特征。这些功能是可选的,并有选择弹出。不幸的是,在许多情况下,这些特征重叠,因此选择某些特征是不可能的。我认为我需要做的是解决这个问题,就是改变我的选择控件,以便它使用点击处理程序并在此处搜索地图上的特征。我需要写什么样的功能?有没有这样的例子实施之前?javascript函数搜索覆盖像素的所有OpenLayers矢量特征
这是功能是如何得出:
var vector_Layer = new OpenLayers.Layer.Vector();
function GetFeaturesFromKMLString (strKML) {
var format = new OpenLayers.Format.KML({
'internalProjection': new OpenLayers.Projection("EPSG:900913"),
'extranalProjection': new OpenLayers.Projection("EPSG:4326")
});
return format.read(strKML);
};
vector_Layer.addFeatures(GetFeaturesFromKMLString('$newkml'));
这就是图层的当前选择:
var select = new OpenLayers.Control.SelectFeature(vector_Layer, {clickout: true});
vector_Layer.events.on({
"featureselected": onFeatureSelect,
"featureunselected": onFeatureUnselect});
map.addControl(select);
select.activate();
select.handlers['feature'].stopDown = false;
select.handlers['feature'].stopUp = false;
这里是click事件侦听我打算用:
OpenLayers.Control.Click = OpenLayers.Class(OpenLayers.Control, {
defaultHandlerOptions: {
'single': true,
'double': false,
'pixelTolerance': 0,
'stopSingle': false,
'stopDouble': false
},
initialize: function(options) {
this.handlerOptions = OpenLayers.Util.extend(
{}, this.defaultHandlerOptions
);
OpenLayers.Control.prototype.initialize.apply(
this, arguments
);
this.handler = new OpenLayers.Handler.Click(
this, {
'click': this.onClick
}, this.handlerOptions
);
},
onClick: function(evt) {
//function that seachers for and selects features at this point
},